Double-walled fluid transport system and related methods

Abstract

Double-walled fluid transport system and related methods. The system includes a double-walled fluid conduit including an outer tube including a pair of flared end regions and a central region extending therebetween defining an outer tube inner surface surrounding an outer tube inner volume, an inner tube defining a central conduit extending within the outer tube inner volume and including a pair of flared end regions and a central region extending therebetween defining an inner tube outer surface. The inner tube and the outer tube define an interlocking geometry and are configured to be supported such that the inner tube passage completely separates the inner tube outer surface from the outer tube inner surface. The method includes forming an outer tube wall in an additive manner and forming an inner tube wall within the outer tube inner volume of the outer tube wall in an additive manner, the inner tube passage extending between the outer tube wall and the inner tube wall.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to double-wall fluid transport systems and related methods. BACKGROUND

[0002] Double-wall pipes (e.g., double-wall pipelines, double-wall tubes, and double-wall pipes) are used in a variety of industries for fluid transport. Generally, double-wall pipes include an inner pipe located within an outer pipe such that a gap volume is formed between the inner pipe and the outer pipe. Typically, the inner pipe is used to transport a fluid. In some applications, the outer pipe is used as a secondary or safety container for capturing or containing fluid that leaks from the inner pipe. Additionally or alternatively, the outer pipe and gap volume are used to insulate the fluid within the inner pipe, for example, to maintain a temperature gradient between the fluid within the inner pipe and the exterior of the outer pipe.

[0003] Traditionally, double-wall pipes require a connection structure that extends within the gap space and mechanically interconnects the inner pipe with the outer pipe to position the inner pipe within the outer pipe. An example of a connection structure is a radial sprocket that is welded or otherwise mechanically joined with the inner pipe and the outer pipe. Thus, in traditional double-wall pipes, the inner pipe and the outer pipe are typically interconnected rather than mechanically isolated from one another. The mechanical coupling of the inner pipe and the outer pipe can cause various problems, particularly for applications that exert stress on the double-wall pipe and / or where there is a large temperature gradient between the inner pipe and the outer pipe. More specifically, defects, cracks, or strains can be transmitted through the connection structure, which can cause mechanical failure of both the inner pipe and the outer pipe. Additionally, the connection structure can transmit heat between the inner pipe and the outer pipe, which can also cause mechanical failure. Accordingly, there is a need for improved double-wall fluid transport systems, double-wall fluid pipes, and methods of forming the same that can mechanically or thermally isolate the inner pipe from the outer pipe, for example, to prevent defects, cracks, strains, and / or heat from being transmitted therebetween. SUMMARY

[0004] Disclosed herein are double-walled fluid transport systems and related methods. A double-walled fluid transport system includes at least one double-walled fluid conduit including an inner tube and an outer tube. The outer tube includes a pair of outer tube flared end regions and an outer tube central region extending between the pair of outer tube flared end regions, wherein the outer tube central region and the pair of outer tube flared end regions define an outer tube inner surface surrounding an outer tube inner volume. The inner tube defines a central conduit and extends within the outer tube inner volume. The inner tube includes a pair of inner tube flared end regions and an inner tube central region extending between the pair of inner tube flared end regions, wherein the pair of inner tube flared end regions and the inner tube central region define an inner tube outer surface. The inner tube and the outer tube define an interlocking geometry, and the inner tube and the outer tube are sized and shaped to be supported such that the inner tube passage completely separates the inner tube outer surface from the outer tube inner surface. The method includes: forming an outer tube wall in an additive manner surrounding the outer tube inner volume and defining an outer tube first flared end region and an opposite outer tube second flared region; and forming an inner tube wall in an additive manner within the outer tube wall, the inner tube passage completely separating the inner tube outer surface of the inner tube wall from the outer tube inner surface of the outer tube wall, wherein the inner tube wall surrounds the central conduit and defines an inner tube first flared end region and an opposite inner tube second flared end region, and the inner tube wall and the outer tube wall define an interlocking geometry. BRIEF DESCRIPTION OF DRAWINGS

[0005] Figure 1 is a schematic representation of an aircraft including a double-walled fluid transport system according to the present disclosure.

[0006] Figure 2 is a schematic representation of a double-walled fluid transport system according to the present disclosure.

[0007] Figure 3 is an isometric view of an example double-walled fluid conduit according to the present disclosure.

[0008] Figure 4 is a partial cross-sectional view of an example double-walled fluid conduit of Figure 3 taken along line 4-4 in Figure 3 .

[0009] Figure 5 is a cross-sectional view of an example double-walled fluid conduit of Figure 3 taken along line 5-5 in Figure 3 .

[0010] Figure 6 is an isometric cutaway view of another example double-walled fluid conduit according to the present disclosure.

[0011] Figure 7 is an isometric view showing an example connection ring according to the present disclosure.

[0012] Figure 8 is a cross-sectional view showing an example of adjacent double-walled fluid conduits according to the present disclosure along with a connection ring interfacing with the inner and outer tubes thereof.

[0013] Figure 9 is an isometric view of an example connection plate according to the present disclosure.

[0014] Figure 10 is an isometric cross-sectional view showing an example of adjacent double-walled fluid conduits according to the present disclosure along with a connection plate interconnecting the adjacent double-walled fluid conduits.

[0015] Figure 11 is a flowchart schematically representing an example of a method according to the present disclosure.

[0016] Figure 12 is an isometric partial cross-sectional view of an example double-walled fluid conduit structure interconnected with an example support structure formed according to a method of the present disclosure.

[0017] Figure 13 is an isometric cross-sectional view of an example double-walled fluid conduit structure formed according to a method of the present disclosure prior to separating the inner tube flared end region from the outer tube flared end region. DETAILED DESCRIPTION

[0018] Figures 1 to 13 Examples of double-walled fluid transport systems 10, double-walled fluid conduits 100, aircraft 12 including and / or utilizing double-walled fluid transport systems 10, and methods 500 according to the present disclosure are provided. In Figures 1 to 13 elements in each of the Figures for similar or at least substantially similar purposes are labeled with like numbers and these elements can not be discussed in detail with respect to Figures 1 to 13 each of the Figures. Similarly, elements in each of the Figures can not be labeled with respect to Figures 1 to 13 each of the Figures, but for consistency, reference numbers associated therewith can be used herein. Elements, components, and / or features discussed with respect to one or more of Figures 1 to 13 the Figures can be included in and / or used with any of the Figures without departing from the scope of the present disclosure. Figures 1 to 13

[0019] Generally, in the Figures, elements that can be included in a given example are shown in solid lines and elements that can be optional in a given example are shown in dashed lines. However, elements shown in solid lines are not essential to all examples of the present disclosure and can be omitted from a particular example without departing from the scope of the present disclosure.

[0020] Figure 1 Examples of aircraft including and / or utilizing double-walled fluid transport systems 10 according to the present disclosure are shown. Examples of double-walled fluid transport systems 10 are shown in Figures 2 to 10 and discussed in greater detail herein with respect thereto.

[0021] ​Aircraft 12 can include a fuselage 20 and at least one wing 14 operatively attached to and / or extending from fuselage 20. Aircraft 12 can also include at least one engine 16, which can be operatively attached to fuselage 20, e.g., via a corresponding wing 14. Aircraft 12 can also include a tail assembly 18, which can be operatively attached to and / or at least partially defined by fuselage 20. Tail assembly 18 can include at least one vertical fin 24 and at least one horizontal fin 22. Aircraft 12 also includes various fluid handling systems 26, such as a fuel supply system that can supply fuel to engine 16 and / or a hydraulic system and / or pneumatic system that can be used to actuate various flight control surfaces 28 included in aircraft 12. In Figure 1 In particular embodiments, at least one fluid handling system 26 is, includes, and / or utilizes a double-walled fluid transport system 10 according to the present disclosure.

[0022] Aircraft 12 can include any suitable type of aircraft, examples including private aircraft, commercial aircraft, passenger aircraft, military aircraft, jetliners, autonomous aircraft, wide-body aircraft, and / or narrow-body aircraft. Although Figure 1 While aircraft 12 is shown as an example of a fixed-wing aircraft, double-walled fluid transport system 10 can also be included in and / or used with any suitable type of aircraft, illustrative non-exclusive examples of other types of aircraft including rotary-wing aircraft, helicopters, tilt-wing aircraft, tiltrotor aircraft, rockets, rocket propulsion systems, and / or spacecraft. Double-walled fluid transport system 10 according to the present disclosure is also not limited to aviation, but can be included in and / or used with fluid handling systems of ground transportation vehicles, nautical vehicles, and fluid handling systems within manufacturing and / or various other industries such as the oil and gas industry.

[0023] Figure 2 A cross-sectional example of a double-walled fluid transport system 10 according to the present disclosure is schematically represented. As shown, double-walled fluid transport system 10 includes at least one double-walled fluid conduit 100. Double-walled fluid conduit 100 includes an outer tube 102 and an inner tube 112 extending within an outer tube inner volume 110 defined by outer tube 102. Outer tube 102 includes a pair of outer tube flared end regions 104 and an outer tube central region 106 extending between the pair of outer tube flared end regions 104. The pair of outer tube flared end regions 104 and outer tube central region 106 define an outer tube inner surface 108 that surrounds outer tube inner volume 110. Similarly, inner tube 112 includes a pair of inner tube flared end regions 114 and an inner tube central region 116 extending between the pair of inner tube flared end regions 114, where inner tube central region 116 and the pair of inner tube flared end regions 114 define an inner tube outer surface 118. Inner tube 112 defines a central conduit 120 that passes through the pair of inner tube flared end regions 114 and extends within inner tube central region 116.

[0024] The inner tube 112 and the outer tube 102 are sized and shaped to be supported such that the interstitial passage 122 completely separates the inner tube outer surface 118 from the outer tube inner surface 108. In other words, the inner tube 112 and the outer tube 102 can be sized and shaped to be supported such that the outer tube inner surface 108 and the inner tube outer surface 118 do not contact, with the interstitial passage 122 extending therebetween.

[0025] The inner tube 112 and the outer tube 102 define an interlocking geometry. In other words, the inner tube 112 and the outer tube 102 can be sized and shaped such that the inner tube 112 cannot be removed from the outer tube 102 without damaging or destroying the inner tube 112 and / or the outer tube 102. In other words, each of the inner tube flared end regions in the inner tube flared end region pair 114 defines an inner tube outermost lateral dimension 124, and along the outer tube central region 106, the outer tube inner surface 108 defines an outer tube passage outermost lateral dimension 126. In some examples, the inner tube outermost lateral dimension 124 is greater than the outer tube passage outermost lateral dimension 126, such that the inner tube 112 and the outer tube 102 define an interlocking geometry. In some examples, the inner tube 112 is unitary and / or the outer tube 102 is unitary. In other words, the inner tube 112 and the outer tube 102 can each define a continuous piece formed without welds or joints.

[0026] Additionally or alternatively, the double-walled fluid transport system 10 can be referred to herein as a double- walled fluid transport system 10 and / or a double-tube fluid transport system 10. Similarly, additionally or alternatively, the double-walled fluid conduit 100 can be referred to as a double-walled fluid conduit 100, a double-tube fluid conduit 100, and / or a double-tube fluid conduit 100. Additionally or alternatively, the inner tube 112 can be referred to as a center tube 112, an inner conduit 112, a flared inner wall 112, an inner flared line 112, and / or a flared inner tube 112. Additionally or alternatively, the outer tube 102 can be referred to as an outer conduit 102, a flared outer wall 102, an outer flared line 102, and / or a flared outer tube 102.

[0027] The double-walled fluid transport system 10 can be used to carry or transport at least one fluid within or through the double-walled fluid conduit 100. As an example, the double-walled fluid transport system 10 can be used to carry or transport fluid within the center conduit 120 of the inner tube 112. In some examples, additionally or alternatively, the double-walled fluid transport system 10 is used to carry fluid within the inter-tube passage 122. When the double-walled fluid transport system 10 is used to carry fluid in the center conduit 120 and fluid in the inter-tube passage 122, the double-walled fluid transport system 10 can be used to carry the same or different fluids in the center conduit 120 and the inter-tube passage 122. Additionally or alternatively, the double-walled fluid transport system 10 can be used to carry fluid in the center conduit 120 and the inter-tube passage 122 in the same or different directions and / or at different flow rates within the center conduit 120 and the inter-tube passage 122. As a more specific example, the double-walled fluid transport system 10 can be used to carry fuel within the center conduit 120 and an oxidizer within the inter-tube passage 122. As another example, the double-walled fluid transport system 10 can be used to carry fuel in a first direction within the center conduit 120 and exhaust air in an opposite direction, for example, when the double-walled fluid transport system 10 is used during a special aircraft refueling operation.

[0028] Additionally or alternatively, the double-walled fluid transport system 10 can be used to carry fluid in one of the center conduit 120 and the inter-tube passage 122 and contain or restrict fluid in the other of the center conduit 120 and the inter-tube passage 122. Additionally or alternatively, the double-walled fluid transport system 10 can be configured to carry or restrict fluid at different pressures within the center conduit 120 and the inter-tube passage 122. As an example, while containing or carrying a second fluid (e.g., fuel) within the center conduit 120, the double-walled fluid transport system 10 can pressurize the inter-tube passage 122 to a specified pressure with an inert gas (e.g., nitrogen). In some such examples, the double-walled fluid transport system 10 includes a pressure sensor that is in communication with the inter-tube passage 122 and is configured to record changes in pressure within the inter-tube passage 122, where the changes in pressure can be used to detect a leak in the center conduit 120, a leak within the inter-tube passage 122, a breach in the inner tube 112, and / or a breach in the outer tube 102.

[0029] In some examples, the outer tube 102 is configured to capture fluid that leaks from the center conduit 120 of the inner tube 112 (e.g., fluid that leaks through a crack, breach, or flaw in the inner tube 112). In these examples, the outer tube 102 is configured to restrict or carry the fluid that leaks from the center conduit 120 within the inter-tube passage 122. As Figure 2As shown, in some examples, the outer tube 102 is provided with an inter-tube port 190 that extends through the outer tube outer surface 109 to the inter-tube passage 122 and selectively provides access to the inter-tube passage 122. When included, the inter-tube port 190 can be used to drain fluid captured within the inter-tube passage 122, and the double-walled fluid transport system 10 can further include an inter-tube port sealing member configured to selectively seal and provide access to the inter-tube port 190 and corresponding inter-tube passage 122.

[0030] As mentioned, the inner tube 112 and the outer tube 102 are sized and shaped to be supported such that the inter-tube passage 122 completely separates the inner tube outer surface 118 from the outer tube inner surface 108. In other words, the double-walled fluid transport system 10 can not include any structure, element, or mechanism that extends between the inner tube outer surface 118 and the outer tube inner surface 108 to mechanically interconnect the inner tube 112 and the outer tube 102 to one another. As such, the inner tube 112 and the outer tube 102 are sized and shaped to be supported such that the inner tube 112 and the outer tube 102 are mechanically isolated from one another. In other words, the inter-tube passage 122 is configured to mechanically isolate the inner tube 112 and the outer tube 102 from one another. The mechanical isolation of the inner tube 112 and the outer tube 102 from one another prevents cracks from being transferred, propagated, or migrated between the inner tube 112 and the outer tube 102 and / or prevents defects (e.g., cracks caused by stress fatigue or inherent material flaws) from migrating or being transferred between the inner tube 112 and the outer tube 102. As such, the double-walled fluid conduit 100 is configured to isolate any mechanical defects, cracks, fissures, or material flaws present in either of the inner tube 112 and the outer tube 102 from the respective body.

[0031] Additionally or alternatively, the inter-tube passage 122 is configured to thermally insulate the fluid within the inner tube 112 and / or the center conduit 120 from the outer tube 102 and / or the space outside of the outer tube 102. In some examples, the double-walled fluid transport system 10 is configured to operate with a thermal or temperature gradient between the fluid within the inner tube 112 and / or the center conduit 120 and the outer tube 102 and / or the space outside of the outer tube 102. In some such examples, the inter-tube passage 122 is configured to insulate the inner tube 112 from the outer tube 102 and / or the space outside of the outer tube 102 to limit heat transfer between the fluid within the inner tube 112 and / or the center conduit 120 and the outer tube 102 and / or the space outside of the outer tube 102. In some such examples, the inter-tube passage 122 is or is configured to contain or transport an insulating fluid. Additionally or alternatively, in some such examples, the inter-tube passage 122 is configured to be evacuated and / or configured to maintain a reduced pressure relative to the center conduit 120 and / or the space outside of the outer tube 102. In any such examples, the double-walled fluid conduit 100 can be described as being configured to thermally insulate the inner tube 112 from the outer tube 102. In other examples, the double-walled fluid conduit 100 is configured to function as at least a portion of a heat exchanger, where the double-walled fluid conduit 100 is configured to transfer heat between the fluid within the center conduit 120 and the fluid within the inter-tube passage 122 and / or the fluid (e.g., air) in the space outside of the outer tube 102.

[0032] The double-walled fluid conduit 100 is formed from any suitable material or materials. The inner tube 112 and the outer tube 102 can be formed from one or more of the same material or one or more different materials. Examples of suitable materials for forming the double-walled fluid conduit 100, the inner tube 112, and / or the outer tube 102 include one or more metals, one or more sintered metals, one or more heat treated metals, aluminum, aluminum alloys, aluminum silicon magnesium alloys, iron, steel, iron alloys, titanium, titanium alloys, composite materials, polymeric materials, polymers, reinforced polymers, plastics, thermoplastic ceramics, and / or combinations thereof. The material or materials forming the double-walled fluid conduit 100 can be selected based on the desired application of the double-walled fluid conduit 100.

[0033] As Figure 2As shown, the pair of outer tube flared end regions 104 can be described as extending outwardly longitudinally and laterally from the outer tube central region 106 such that the outermost lateral and longitudinal dimensions of the pair of outer tube flared end regions 104 are greater than the outer tube central region 106. As referred to herein, longitudinal refers to a direction aligned with a central axis or long axis of the double-walled fluid conduit 100 and / or a central axis or long axis of a corresponding component. The pair of outer tube flared end regions 104 terminate to form an outer tube base 152 of the outer tube 102, and the outer tube base 152 can form a surface configured to interface with an adjacent structure (e.g., an adjacent outer tube 102, another component of the double-walled fluid transport system 10, and / or an external structure). The pair of outer tube flared end regions 104 are hollow and at least partially or completely surround the pair of inner tube flared end regions 114. The pair of inner tube flared end regions 114 can also be described as extending outwardly longitudinally and laterally from the inner tube central region 116 such that the outermost lateral and longitudinal dimensions of the pair of inner tube flared end regions 114 are greater than the inner tube central region 116. The pair of inner tube flared end regions 114 terminate to form an inner tube base 144, which can form a surface configured to interface with an adjacent structure (e.g., an adjacent inner tube 112, another component of the double-walled fluid transport system 10, and / or an external structure).

[0034] Each of the pair of inner tube flared end regions 114 and each of the pair of outer tube flared end regions 104 can extend outwardly laterally and longitudinally to form any suitable flared angle with the central axis 101 of the double-walled fluid conduit 100. The flared angle formed by each of the pair of inner tube flared end regions can be the same or different than the flared angle formed by a corresponding or adjacent pair of outer tube flared end regions. Likewise, the inner tube flared end regions can form the same or different flared angles relative to one another, and the outer tube flared end regions can form the same or different flared angles relative to one another. In other words, the inner tube first flared end region 136 can be parallel or angled relative to the outer tube first flared end region 132, and the inner tube second flared end region 138 can be parallel or angled relative to the outer tube second flared end region 134. Examples of suitable flared angles include at least 5°, at least 10°, at least 20°, at least 30°, at least 35°, at least 40°, at least 45°, at least 50°, at least 60°, at most 5°, at most 10°, at most 20°, at most 30°, at most 35°, at most 40°, at most 45°, at most 50°, at most 60°, and / or at most 80°.

[0035] The inner tube 112 and the outer tube 102 can have the same or different lengths such that the inner tube base 144 and the outer tube base 152 can be aligned with or offset from each other when the inner tube 112 and the outer tube 102 are supported relative to each other. The inner tube flared end region pair 114 forms any suitable proportion of the overall length of the inner tube 112, examples including at least 1%, at least 5%, at least 10%, at least 20%, at least 50%, at least 75%, at least 90%, at most 1%, at most 5%, at most 10%, at most 20%, at most 50%, at most 75%, and / or at most 90%. Likewise, the outer tube flared end region pair 104 forms any suitable proportion of the overall length of the outer tube 102, examples including at least 1%, at least 5%, at least 10%, at least 20%, at least 50%, at least 75%, at least 90%, at most 1%, at most 5%, at most 10%, at most 20%, at most 50%, at most 75%, and / or at most 90%.

[0036] The inner tube 112 and the outer tube 102 can include any suitable shape and / or dimensions relative to each other such that the inner tube 112 and the outer tube 102 define an interlocking geometry, and such that the inner tube 112 and the outer tube 102 are configured to be supported such that the inter-tube passage 122 completely separates the inner tube outer surface 118 from the outer tube inner surface 108. As an example, the shape and dimensions of the inner tube 112 and the outer tube 102 can be designed to be supported such that the inner tube outer surface 118 and the outer tube inner surface 108 are parallel, at least substantially parallel, coaxial, and / or concentric. In some examples, the inner tube 112 and the outer tube 102 are configured such that the inner tube outer surface 118 and the outer tube inner surface 108 are not parallel. As an example, the inner tube outer surface 118 and / or the outer tube inner surface 108 can be provided with complex shapes or surface features that facilitate a flow pattern of fluid within the inter-tube passage 122. In particular examples, the inner tube outer surface 118 and / or the outer tube inner surface 108 are provided with vortex-generating geometric features configured to facilitate heat exchange between fluid within the central conduit 120 and fluid within the inter-tube passage 122.

[0037] With continued reference to Figure 2The double-walled fluid conduit 100 includes a double-walled center region 158 defined by the inner tube center region 116 and the outer tube center region 106 and a pair of double-walled flared end regions 141 defined by the pair of inner tube flared end regions 114 and the pair of outer tube flared end regions 104. The double-walled fluid conduit 100 is configured to have any suitable cross-sectional shape. As discussed herein, the cross-sectional shape of the double-walled fluid conduit 100 or a component thereof is the shape of the double-walled fluid conduit 100 or the component thereof transverse to the length or center axis 101 of the double-walled fluid conduit 100. The inner tube 112 and the outer tube 102 can have the same or different cross-sectional shapes. Similarly, the pair of inner tube flared end regions 114 can have the same or different cross-sectional shapes from each other and / or from the inner tube center region 116, and the pair of outer tube flared end regions 104 can have the same or different cross-sectional shapes from each other and / or from the outer tube center region 106. Examples of suitable inner tube 112, outer tube 102, and / or double-walled fluid conduit 100 cross-sectional shapes include circular cross-sections, oval cross-sections, square cross-sections, rectangular cross-sections, triangular cross-sections, and / or polygonal cross-sections.

[0038] As shown in FIG. 1, the double-walled fluid conduit 100 includes an inner tube 112 and an outer tube 102. The inner tube 112 and the outer tube 102 are concentrically arranged about a common center axis 101 of the double-walled fluid conduit 100. The inner tube 112 and the outer tube 102 are configured to define a double-walled fluid conduit 100. The inner tube 112 and the outer tube 102 are configured to define a double-walled center region 158 of the double-walled fluid conduit 100. The inner tube 112 and the outer tube 102 are also configured to define a pair of double-walled flared end regions 141 of the double-walled fluid conduit 100. Figure 2 As shown, the double-walled center region 158 of the double-walled fluid conduit 100 can include a curved configuration 160 or a straight configuration 162. In the straight configuration 162, the double-walled center region 158 defines a straight or linear center axis 101, and in the curved configuration 160, the double-walled center region 158 defines a curved or non-linear center axis 101. In some examples, the curved configuration 160 includes a plurality of curves, and in other examples, the curved configuration 160 includes a single curve. When the double-walled center region 158 includes a curved configuration 160, each curve in the double-walled center region 158 can include any suitable angle of curvature, examples of suitable angles of curvature include at least 5°, at least 10°, at least 20°, at least 45°, at least 60°, at least 90°, at least 120°, at most 5°, at most 10°, at most 20°, at most 45°, at most 60°, at most 90°, at most 120°, and / or at most 180°. More specific examples of curved configurations 160 include S-shaped configurations, U-shaped configurations, elbows, and / or one or more bends.

[0039] The pair of inner tube flared end regions 114 includes an inner tube first flared end region 136 and an inner tube second flared end region 138 opposite the inner tube first flared end region 136. Similarly, the pair of outer tube flared end regions 104 includes an outer tube first flared end region 132 and an outer tube second flared end region 134 opposite the outer tube first flared end region 132. The outer tube first flared end region 132 and the inner tube first flared end region 136 define a double-walled first flared end region 140 of the double-walled fluid conduit 100. The inner tube second flared end region 138 and the outer tube second flared end region 134 define a double-walled second flared end region 142 of the double-walled fluid conduit 100.

[0040] In some examples, the double-walled fluid conduit 100 includes a plurality of inner tube fastener holes 128 disposed around at least one of a first flared end region 140 and a second flared end region 142. The inner tube fastener holes 128 are configured to cooperate with a plurality of inner tube fasteners 130 to operatively engage an inner tube 112 to an adjacent structure. In some examples, the double-walled fluid conduit 100 includes a plurality of first-end inner tube fastener holes 128 disposed around the first flared end region 140, wherein the plurality of first-end inner tube fastener holes 128 extend from an inner tube base 144 of the first flared end region 136 through an outer tube outer surface 109 of the first flared end region 132. Additionally or alternatively, in some examples, the double-walled fluid conduit 100 includes a plurality of second-end inner tube fastener holes 128 disposed around the second flared end region 142 of the double wall, wherein the plurality of second-end inner tube fastener holes 128 extend from the inner tube base 144 of the second flared end region 138 of the inner tube through the outer tube outer surface 109 of the second flared end region 134 of the outer tube.

[0041] like Figure 2 As shown, each inner tube fastener hole 128 may include a fastener receiving region 127 located within the inner tube 112 and configured to receive an inner tube fastener 130, and a sealing receiving region 129 located within the outer tube 102 and configured to receive an inter-tube sealing member 146. Thus, the fastener receiving region 127 is configured to cooperate with the inner tube fastener 130 to operatively connect the inner tube 112 to an adjacent structure without interconnecting the inner tube 112 with the outer tube 102 using the inner tube fastener 130. The sealing receiving region 129 receives the inter-tube sealing member 146 to separate or seal the space outside the inter-tube passage 122 from the outer tube 102.

[0042] In some examples, the double-walled fluid conduit 100 includes a plurality of outer tube fastener holes 148 located along at least one of a first flared end region 140 and a second flared end region 142. The outer tube fastener holes 148 are configured to cooperate with a plurality of outer tube fasteners 150 to operatively engage an outer tube 102 to an adjacent structure. In some examples, the double-walled fluid conduit 100 includes a plurality of first-end outer tube fastener holes 148 located along the first flared end region 140, wherein the plurality of first-end outer tube fastener holes 148 extend from an outer tube base 152 of the first flared end region 132 through an outer tube outer surface 109 of the first flared end region 132. Additionally or alternatively, in some examples, the double-walled fluid conduit 100 includes a plurality of second-end outer tube fastener holes 148 positioned along the second flared end region 142 of the double wall, wherein the plurality of second-end outer tube fastener holes 148 extend from the outer tube base 152 of the outer tube second flared end region 134 through the outer tube outer surface 109 of the outer tube second flared end region 134.

[0043] When the double-walled fluid conduit 100 includes multiple inner conduit fastener holes 128 and multiple outer conduit fastener holes 148 positioned along the same flared end region of the double-walled fluid conduit, the inner conduit fasteners 130 can operatively couple the inner conduit 112 to the same or different adjacent structure to which the outer conduit fasteners 150 operatively couple the outer conduit 102.

[0044] With continued reference to Figure 2 In some examples, the double-walled fluid conduit 100 includes at least one inner conduit seal region 154 disposed about at least one inner conduit base 144 of the inner conduit 112, optionally two inner conduit seal regions 154 disposed about two inner conduit bases 144. In some examples, each inner conduit base 144 encloses the central conduit 120, and the inner conduit seal region 154 is disposed about a surface formed by the inner conduit base 144. In some examples, the inner conduit seal region 154 is configured to form a fluid seal between the inner conduit 112 and an external component to sealingly interconnect the central conduit 120 with the external component. In some examples, the inner conduit fasteners 130 are configured to push the inner conduit seal region 154 toward the external component to form a fluid seal therebetween.

[0045] Additionally or alternatively, in some examples, the double-walled fluid conduit 100 includes at least one outer conduit seal region 156 disposed about at least one outer conduit base 152 of the outer conduit 102. In some examples, each outer conduit base 152 encloses the outer conduit inner volume 110 of the outer conduit 102, and the outer conduit seal region 156 is disposed about a surface formed by the outer conduit base 152. In some examples, the outer conduit seal region 156 is configured to form a fluid seal between the outer conduit 102 and an external component to sealingly interconnect the outer conduit inner volume 110 with the external component. In some examples, the outer conduit fasteners 150 are configured to push the outer conduit seal region 156 toward the external component to form a fluid seal therebetween.

[0046] When included, the inner conduit seal region 154 and / or the outer conduit seal region 156 includes any suitable structure and / or one or more materials configured to form a fluid seal between the inner conduit 112 and / or the outer conduit 102 and an external component. As an example, the inner conduit seal region 154 can include an O-ring or gasket extending about the inner conduit base 144, and the outer conduit seal region 156 can include an O-ring or gasket extending about the outer conduit base 152. Examples of suitable materials for forming the inner conduit seal region 154 and / or the outer conduit seal region 156 include an elastomeric material, a sealing material, one or more polymers, one or more elastomeric polymers, one or more silicones, one or more heat-resistant polymers, graphite, ceramic, rubber, a fluoropolymer, a polyamide, and / or combinations thereof.

[0047] With continued reference toFigure 2 In some examples, the double-walled fluid transport system 10 includes a plurality of double-walled fluid conduits 100. In these examples, the double-walled fluid conduits 100 are configured to be operatively interconnected to form one or more continuous or extended double-walled fluid conduits 100. In some examples, adjacent double-walled fluid conduits 100 are configured to be directly interconnected with each other, and in other examples, the double-walled fluid transport system 10 includes one or more interconnecting members configured to interconnect, intersect, or facilitate connections between adjacent double-walled fluid conduits 100.

[0048] like Figure 2 As shown on the left side, in some examples, the double-walled fluid transport system 10 includes at least one connecting plate 170, and optionally multiple connecting plates 170. The connecting plates 170 are configured to interconnect adjacent double-walled fluid conduits 100 and support the inner tube 112 and outer tube 102 of adjacent double-walled fluid conduits 100, such that an inter-tube passage 122 completely separates the outer surface 118 of the inner tube from the inner surface 108 of the outer tube, at least near the connecting plate 170. In some examples, the double-walled fluid conduit 100 is interconnected with two connecting plates 170 at both ends, such that the connecting plates 170 support the outer tube 102 and the inner tube 112 spaced apart, and the inter-tube passage 122 extends along the entire length of the double-walled fluid conduit 100 between the spaced-apart outer tube 102 and inner tube 112.

[0049] In some examples, the connecting plate 170 includes a central conduit 172 configured to provide fluid communication between central conduits 120 of adjacent double-walled fluid conduits 100. In a more specific example, the central conduit 172 includes orifices extending through the connecting plate 170 to fluidly interconnect the central conduits 120, and is sized to correspond to the central conduits 120. In some examples, the connecting plate 170 includes a fluid-permeable inter-pipe region 174 configured to provide fluid communication between inter-pipe channels 122 of adjacent double-walled fluid conduits 100. In a more specific example, the fluid-permeable inter-pipe region 174 includes a plurality of orifices extending through the connecting plate 170 to fluidly interconnect the inter-pipe channels 122 of adjacent double-walled fluid conduits 100. Thus, the connecting plate 170 can be integrally formed.

[0050] In some examples, the connection plate 170 includes a plurality of outer pipe coupling portions 176 configured to operatively couple outer pipes 102 of adjacent double-wall fluid pipes 100 to the connection plate 170 and / or a plurality of inner pipe coupling portions 178 configured to operatively couple inner pipes 112 of adjacent double-wall fluid pipes 100 to the connection plate 170. In some examples, the outer pipe coupling portions 176 receive outer pipe fasteners 150 engaged with the outer pipe fastener holes 148 and / or the inner pipe coupling portions 178 receive inner pipe fasteners 130 engaged with the inner pipe fastener holes 128. When included, the outer pipe coupling portions 176 are configured to support portions of adjacent outer pipes 102 near the connection plate 170 at least at desired locations, which can include aligning adjacent outer pipes 102 with each other, aligning the outer pipes 102 with corresponding inner pipes 112, and / or aligning the outer pipes 102 with the fluid permeable inter-pipe region 174. Likewise, when included, the inner pipe coupling portions 178 are configured to support portions of adjacent inner pipes 112 near the connection plate 170 at least at desired locations, which can include aligning adjacent inner pipes 112 with each other, aligning adjacent center pipes 120 with each other, and / or aligning the inner pipes 112 of corresponding double-wall fluid pipes 100 with the outer pipes 102. In some examples, the connection plate 170 is configured to be coupled to an adjacent structure to support or position the adjacent double-wall fluid pipes 100 relative to the adjacent structure and / or to support or position a portion of the double-wall fluid transport system 10 relative to the adjacent structure.

[0051] For some examples in which the inner pipes 112 include inner pipe sealing regions 154, the inner pipe sealing regions 154 are configured to form a fluid seal with the connection plate 170 around the connection plate center pipe 172 and to allow fluid communication between the connection plate center pipe 172 and the center pipe 120. Likewise, for some examples in which the outer pipes 102 include outer pipe sealing regions 156, the outer pipe sealing regions 156 form a fluid seal with the connection plate 170 around the fluid permeable inter-pipe region 174 and allow fluid communication between the inter-pipe passage 122 and the fluid permeable inter-pipe region 174.

[0052] The connection plate 170 can be formed from the same and / or different material(s) as the double-wall fluid pipes 100. In some examples, the connection plate 170 includes a unitary construction, and in other examples, the connection plate 170 is formed from a plurality of sub-components. In some examples, the connection plate 170 is sized and / or shaped to correspond to an outermost dimension of the outer pipes 102.

[0053] As Figure 3 to 10As shown on the right in FIG. 1, in some examples, the double- walled fluid transport system 10 includes at least one connection ring 180, optionally a plurality of connection rings 180. The connection ring 180 is configured to be positioned between the inner tube base 144 and the outer tube base 152 of a double-walled fluid conduit 100 and to support the inner tube 112 and the outer tube 102 such that the interstitial passage 122 completely separates the inner tube outer surface 118 from the outer tube inner surface 108 at least in the vicinity of the connection ring 180. In some examples, the connection ring 180 is configured to engage, index, align, and / or support the inner tube 112 and the outer tube 102 of an adjacent double-walled fluid conduit 100 relative to one another. More specifically, the connection ring 180 is sized and shaped to extend between and be positioned within end regions of the interstitial passage 122 of an adjacent double-walled fluid conduit 100 and to support the inner tube base 144 and the outer tube base 152 of each adjacent double-walled fluid conduit 100 spaced apart, with the interstitial passage 122 extending therebetween. In some examples, the connection ring 180 is installed in either double-walled flared end region of a double-walled fluid conduit 100 such that two connection rings 180 support the outer tube 102 spaced apart from the inner tube 112 such that the interstitial passage 122 separates the inner tube outer surface 118 from the outer tube inner surface 108 along the entire length of the double-walled fluid conduit 100.

[0054] When included, the connection ring 180 can be sized to correspond with the innermost lateral dimension of the outer tube base 152 and the outermost lateral dimension of the inner tube base 144. When the connection ring 180 interfaces and supports the inner tube 112 and the outer tube 102 of an adjacent double-walled fluid conduit 100, the connection ring 180 can be configured to provide fluid communication between the interstitial passages 122 of the adjacent double-walled fluid conduit 100. As discussed in greater detail herein, some connection rings 180 include a connection ring body defining an inner radial surface and an outer radial surface and further include a plurality of offset notches disposed about the inner radial surface and the outer radial surface that provide fluid communication between the interstitial passages 122. The connection ring 180 is formed from any suitable material or materials, examples including an elastomeric material, a sealing material, one or more polymers, one or more elastomeric polymers, one or more silicones, one or more heat-resistant polymers, graphite, ceramic, rubber, a fluoropolymer, a polyamide, and / or combinations thereof.

[0055] In some examples, the connecting ring 180 is configured to allow the inner tubes 112 and the outer tubes 102 of adjacent double-walled fluid conduits 100 to be directly coupled to one another. In particular examples, one or both sets of inner tube fasteners 130 engage with the inner tube fastener holes 128 of each adjacent inner tube 112 to sealingly interconnect the adjacent inner tube bases 144 of the adjacent inner tubes 112 to one another, and the outer tube fasteners 150 engage with the outer tube fastener holes 148 of each adjacent outer tube 102 to sealingly interconnect the outer tube bases 152 to one another. The connecting ring 180 is installed within the end region of the inter-tube passage 122 and supports the inner tubes 112 at a desired radial separation from the outer tubes 102 and / or centers the inner tubes 112 within the outer tubes 102, while providing fluid communication between the inter-tube passages 122 of adjacent double-walled fluid conduits 100. In this way, the connecting ring 180 provides support and fluid interconnection for the inter-tube passages 122 of adjacent double-walled fluid conduits 100 without the need to mechanically couple the inner tubes 112 to the outer tubes 102 and allows for direct coupling of adjacent double-walled fluid conduits 100.

[0056] Turning now to Figure 2 , exemplary, non-exclusive examples of a double-walled fluid transport system 10, a double-walled fluid conduit 100, a connecting plate 170, and a connecting ring 180 are shown. Where appropriate, reference numerals from Figures 3 to 10 the schematic diagrams are used to designate corresponding portions of Figures 3 to 10 ; however, Figures 3 to 10 the examples are non-exclusive and do not limit the double-walled fluid transport system 10 to the embodiments shown in Figures 3 to 10 . That is, the double-walled fluid transport system 10 is not limited to the particular embodiments of double-walled fluid conduits 100, connecting plates 170, and connecting rings 180 shown in Figure 2 the double-walled fluid transport system 10 can incorporate any number of various aspects, configurations, characteristics, properties, etc. of double-walled fluid conduits 100, connecting plates 170, and connecting rings 180 shown and discussed with reference to Figures 3 to 10 the schematic diagrams and / or Figures 3 to 10 embodiments without including all such aspects, configurations, characteristics, properties, etc. For brevity, various components, parts, portions, aspects, regions, etc. of the double-walled fluid transport system 10 previously discussed, shown, and / or labeled can no longer be discussed, shown, and / or labeled with reference to Figures 3 to 10 ; however, previously discussed features, variants, etc. are within the scope of the present disclosure and can be used with Figures 3 to 5 .

[0057] Figure 4A first example of the double-walled fluid conduit 100 indicated herein and referred to as double-walled fluid conduit 300 is shown. The double-walled fluid conduit 300 is an example of the double-walled fluid conduit 100 in which the double-walled center region 158 includes a straight-line configuration 162 and the double-walled flared end region pairs 141 extend outwardly from the double-walled center region 158 at a corresponding flared angle longitudinally and laterally. The inner tube 112 and the outer tube 102 include circular cross-sectional shapes such that the outermost lateral dimension of the inner tube 112, the inner tube base 144, is a diameter. The inner tube 112 and the outer tube 102 are sized such that the inner tube base 144 and the outer tube base 152 are aligned with or flush with each other. The inner tube 112 includes an inner tube sealing region 154 that, in this example, includes a pair of concentric grooves extending along the inner tube base 144 around the center conduit 120 and configured to receive an O-ring extending outwardly from the inner tube base 144. The outer tube 102 includes an outer tube sealing region 156 that, in this example, includes a concentric groove extending around the outer tube base 152 and configured to receive an O-ring extending outwardly from the outer tube base 152. The inner tube sealing region 154 is configured to fluidly isolate the center conduit 120 from the inter-tube passage 122 and the outer tube sealing region 156 fluidly isolates the inter-tube passage 122 from the region outside of the outer tube 102.

[0058] Further shown, the double-walled fluid conduit 300 includes an inner tube fastener hole 128 and an outer tube fastener hole 148 extending parallel to the central axis 101 of the double-walled fluid conduit 300. The inner tube fastener hole 128 extends through the outer tube outer surface 109 of the outer tube flared end region pair 104, through the inner tube outer surface 118 of the inner tube flared end region pair 114, and out of the inner tube base 144 of the inner tube flared end region pair 114. The outer tube fastener hole 148 is positioned laterally outward of the outermost lateral dimension of the inner tube 112 and extends through the outer tube outer surface 109 of the outer tube flared end region pair 104 by the outer tube base 152. In this example, the inner tube fastener hole 128 and the outer tube fastener hole 148 are radially offset from each other, which can improve the strength of the outer tube 102 and / or reduce the propensity for stress cracks to form between the inner tube fastener hole 128 and the outer tube fastener hole 148.

[0059] As Figure 5As best shown, the double-walled fluid conduit 300 includes an inner tube fastener hole 128 and an outer tube fastener hole 148 that extend parallel to the central axis 101 of the double-walled fluid conduit 300. The inner tube fastener hole 128 passes through the outer tube outer surface 109 of the outer tube flared end region pair 104, through the inner tube outer surface 118 of the inner tube flared end region pair 114, and extends beyond the inner tube base 144 of the inner tube flared end region pair 114. The outer tube fastener hole 148 is positioned laterally outward of the outermost lateral dimension of the inner tube 112 and extends through the outer tube outer surface 109 of the outer tube flared end region pair 104 by the outer tube base 152. In this example, the inner tube fastener hole 128 and the outer tube fastener hole 148 are radially offset from one another, which can improve the strength of the outer tube 102 and / or reduce the propensity for stress cracks to form between the inner tube fastener hole 128 and the outer tube fastener hole 148.

[0060] The inner tube fastener hole 128 includes a seal receiving region 129 positioned within the outer tube flared end region pair 104 and configured to receive an inter-tube seal member 146 that fluidly isolates the inter-tube passage 122 from the exterior of the outer tube 102 when the inter-tube seal member 146 is received in the seal receiving region 129. The inner tube fastener hole 128 also includes a fastener receiving region 127 positioned within the inner tube flared end region pair 114 and configured to receive an inner tube fastener 130. As such, the inner tube fastener hole 128 is configured such that the inner tube fastener 130 only engages the inner tube 112 and does not mechanically interconnect the inner tube 112 and the outer tube 102.

[0061] As Figure 6 As best shown, the inner tube 112 is sized and shaped to be positioned within the outer tube inner volume 110 such that the inter-tube passage 122 separates the inner tube outer surface 118 and the outer tube inner surface 108. The inner tube outermost lateral dimension 124 of the inner tube first flared end region 136 and the inner tube second flared end region 138 is greater than the outer tube passage outermost lateral dimension 126 of the outer tube central region 106 such that the inner tube 112 and the outer tube 102 define an interlocking geometry. In this example, the inner tube 112 and the outer tube 102 are sized and shaped such that the inner tube outer surface 118 and the outer tube inner surface 108 are substantially parallel to one another along the entire length of the double-walled fluid conduit 300.

[0062] The double-walled fluid conduit 300 also includes an inter-tube port 190 that extends through the outer tube outer surface 109 to the inter-tube passage 122 to selectively provide access from outside the outer tube 102 to the inter-tube passage 122. In some examples, the inter-tube port 190 is configured to receive an inter-tube port sealing member that selectively seals and provides access to the inter-tube port 190. In some examples, the inter-tube port 190 is used to vent fluid that enters the inter-tube passage 122 from the central conduit 120 through a breach in the inner tube 112. Additionally or alternatively, the inter-tube port 190 can include one or more sensors (e.g., pressure and / or flow sensors) configured to detect various physical indicia (e.g., flow and / or pressure) of fluid within the inter-tube passage 122.

[0063] Figure 6 An example of the double-walled fluid conduit 100 indicated herein and referred to as a double-walled fluid conduit 400 is shown. As shown, the double-walled central region 158 of the double-walled fluid conduit 400 includes a curved configuration 160 such that the central axis 101 of the double-walled fluid conduit is curved and / or non-linear. In this particular example, the curved configuration 160 includes two curves that form an S-shaped configuration. In the curved configuration 160, the inner tube central region 116 and the outer tube central region 106 include corresponding curves such that the inner tube outer surface 118 and the outer tube inner surface 108 are not in contact with the inter-tube passage 122 extending therebetween. The curved configuration 160 of the double-walled central region 158 can allow the double-walled fluid conduit 400, and thus the double-walled fluid transport system 10, to extend around features of adjacent structures, interconnect fluid inlets and outlets that are spatially offset from one another, and / or carry or transport one or more fluids along a non-linear path. Figure 7

[0064] An example connection ring 180 that can be included in and / or used in the double-walled fluid transport system 10 according to the present disclosure is shown. As shown, the connection ring 180 includes a connection ring body 182 that defines an outer radial surface 184 and an inner radial surface 186 opposite the outer radial surface 184. The connection ring body 182 includes a plurality of inboard notches 188 disposed about the inner radial surface 186 and a plurality of outboard notches 192 disposed about the outer radial surface 184. The inboard notches 188 and the outboard notches 192 can also be described as including a plurality of cutouts, channels, and / or recesses. Figure 7 Figure 8

[0065] ​​When the connecting ring 180 is positioned within the end region of the inter-tube passage 122 of an adjacent double-walled fluid conduit 100, the inner radial surface 186 contacts the adjacent inner tube 112 and the outer radial surface 184 contacts the adjacent outer tube 102. The inner side notches 188 and the outer side notches 192 extend between the inter-tube passages 122 of the adjacent double-walled fluid conduit 100 to provide fluid communication therebetween. In the example shown, the inner side notches 188 and the outer side notches 192 are radially offset from one another, which can improve the strength of the connecting ring 180 and / or improve fluid flow through the connecting ring 180. The connecting ring 180 also includes a transverse edge region 194 extending between the outer radial surface 184 and the inner radial surface 186. In some examples, the transverse edge region 194 is provided with fluid dynamic geometry configured to reduce fluid flow resistance across the connecting ring 180.

[0066] Figure 8 An example of adjacent double-walled fluid conduits 300 directly connected to one another is shown. As shown, the connecting ring 180 extends within the end regions of the inter-tube passages 122 of the respective double-walled fluid conduits 300 to support the inner tubes 112 spaced apart from the outer tubes 102 and provide fluid communication between the inter-tube passages 122. The inner tube fastener holes 128 are aligned such that the inner tube fasteners 130 can directly interconnect the inner tubes 112 to one another. The outer tube fasteners 150 are also aligned such that the outer tubes 102 can be directly coupled to one another. It is further shown that the flare angle and skirt formed by the inner tube flared end regions 114 and the outer tube flared end regions 104 provide inter-tube passages 122 having a tapered geometry that limits movement of the connecting ring 180 away from the interface between adjacent double-walled fluid conduits 300 and / or away from the end regions of the inter-tube passages 122. In some examples, the connecting ring 180 is configured to provide a sliding interface between the inner tubes 112 and the outer tubes 102. In particular, in some such examples, the connecting ring 180 is configured to allow the inner tubes 112 and the outer tubes 102 to slide relative to one another to avoid load transfer therebetween that can be caused by factors such as thermal expansion and / or contraction and / or axial displacement due to pressure differentials.

[0067] In Figure 9In some examples, the inner tube fastener holes 128 of each double-walled fluid conduit 300 are identical, such that a mating fastener can be inserted into the inner tube fastener hole 128 of either double-walled fluid conduit 300 to couple the inner tubes 112 to one another. Alternatively, adjacent double-walled fluid conduits 300 can include different inner tube fastener holes 128, and an inner tube fastener 130 can be inserted through the inner tube fastener hole 128 of one double-walled fluid conduit 300 to be received by the inner tube fastener hole 128 of another double-walled fluid conduit 300. Similarly, in some examples, identical inner tube seal regions 154 are disposed about the inner tube base 144 and / or identical outer tube seal regions 156 are disposed about the outer tube base 152. In other examples, one double-walled fluid conduit 300 is provided with a protruding inner tube seal region 154 that is received by the inner tube seal region 154 of another double-walled fluid conduit 300, and / or one double-walled fluid conduit 300 is provided with a protruding outer tube seal region 156 that is received by the outer tube seal region 156 of another double-walled fluid conduit 300. More generally, the double-walled first flared end region 140 can include the same or different components, features, dimensions, and / or geometries as the double-walled second flared end region 142 within the scope of the present disclosure.

[0068] Figure 10 An example connection plate 170 according to the present disclosure is shown. In this example, the connection plate 170 includes a unitary construction defining a hollow cylindrical shape, such that a connection plate central conduit 172 extends laterally through a central region of the connection plate 170. Opposing faces of the connection plate 170 include an outer tube coupling portion 176 configured and positioned to receive the outer tube fasteners 150 and an inner tube coupling portion 178 configured and positioned to receive the inner tube fasteners 130. A fluid permeable inter-tube region 174 includes a plurality of holes 175 extending between the opposing faces of the connection plate 170 (parallel to the connection plate central conduit 172). The holes 175 are radially positioned about the connection plate 170 between the inner tube coupling portion 178 and the outer tube coupling portion 176 and correspond to the inter-tube passages of the double-walled fluid conduits with which the connection plate 170 is configured to interconnect. The inner tube coupling portion 178 and / or the outer tube coupling portion 176 can include threaded holes that partially extend from either face of the connection plate 170 into the connection plate 170, and / or the inner tube coupling portion 178 and / or the outer tube coupling portion 176 can include holes that extend through either face of the connection plate 170.

[0069] Figure 10 An example connection plate 170 according to the present disclosure is shown. Figure 10The illustrated cross-section is taken along a line extending through the opposite inner tube fastener holes 128. In this example, the connecting plate 170 is sized and shaped to correspond with the outermost dimensions of the outer tube 102 and the connecting plate center conduit 172 is aligned with the center conduit 120. The apertures 175 of the fluid permeable inter-tube region 174 are aligned with and interconnect between the inter-tube passages 122 of the double-walled fluid conduit 300 to provide fluid communication therebetween. The inner tube fastener holes 128 are aligned with the inner tube coupling portions 178 disposed on either face of the connecting plate 170 such that the inner tube fasteners 130 can interconnect the inner tube fastener holes 128 and the inner tube coupling portions 178 to support the inner tube base 144 against either face of the connecting plate 170 and position the inner tube 112 relative to the outer tube 102 and the connecting plate center conduit 172. In this example, the inner tube coupling portions 178 comprise threaded holes. Likewise, the outer tube fastener holes 148 are aligned with the outer tube coupling portions 176 disposed on either face of the connecting plate 170 such that the outer tube fasteners 150 can interconnect the outer tube fastener holes 148 and the outer tube coupling portions 176 to support the outer tube base 152 against either face of the connecting plate 170 and position the outer tube 102 relative to the inner tube 112 and the fluid permeable inter-tube region 174. In this way, the connecting plate 170, together with the inner tube fasteners 130 and the outer tube fasteners 150, supports the inner tube 112 and the outer tube 102 spaced apart with the inter-tube passages 122 extending between the spaced apart inner tube 112 and outer tube 102. When the double-walled fluid conduit 300 is operatively coupled to one another via the inner tube coupling portions 178 and the outer tube coupling portions 176 of the connecting plate 170, the connecting plate 170 can allow adjacent double-walled fluid conduits 300 to include and / or utilize the same inner tube fastener holes 128, the same inner tube fasteners 130, the same outer tube fastener holes 148, and / or the same outer tube fasteners 150. In other words, the connecting plate 170 can each allow the double-walled fluid conduit 300 to include and / or utilize the same double-walled first flared end region 140 as the double-walled second flared end region 142.

[0070] Figure 8 It is further shown that each inner tube base 144 is provided with an inner tube sealing region 154 that forms a fluid seal with the connecting plate 170 around the connecting plate center conduit 172 and each outer tube base 152 is provided with an outer tube sealing region 156 that forms a fluid seal with the connecting plate 170 around the fluid permeable inter-tube region 174.

[0071] Although Figure 10 and Figure 8Examples are shown of two double-walled fluid conduits 300 being interconnected with one another using a connection ring 180 or a connection plate 170, but the double-walled fluid transport system 10 can include any suitable number of interconnected double-walled fluid conduits 100 and a plurality of connection rings 180 and / or a plurality of connection plates 170 interconnecting any suitable number of double-walled fluid conduits 100 in an end-to-end manner. Additionally, although Figure 10 Examples are shown of two double-walled fluid conduits 300 being interconnected with one another using a connection ring 180 or a connection plate 170, but the double-walled fluid transport system 10 can include any suitable number of interconnected double-walled fluid conduits 100 and a plurality of connection rings 180 and / or a plurality of connection plates 170 interconnecting any suitable number of double-walled fluid conduits 100 in an end-to-end manner. Additionally, although Figure 11 Examples are shown of two double-walled fluid conduits 300 being interconnected with one another using a connection ring 180 or a connection plate 170, but the double-walled fluid transport system 10 can include any suitable number of interconnected double-walled fluid conduits 100 and a plurality of connection rings 180 and / or a plurality of connection plates 170 interconnecting any suitable number of double-walled fluid conduits 100 in an end-to-end manner. Additionally, although Examples are shown of two double-walled fluid conduits 300 being interconnected with one another using a connection ring 180 or a connection plate 170, but the double-walled fluid transport system 10 can include any suitable number of interconnected double-walled fluid conduits 100 and a plurality of connection rings 180 and / or a plurality of connection plates 170 interconnecting any suitable number of double-walled fluid conduits 100 in an end-to-end manner. Additionally, although

[0072] Examples are shown of two double-walled fluid conduits 300 being interconnected with one another using a connection ring 180 or a connection plate 170, but the double-walled fluid transport system 10 can include any suitable number of interconnected double-walled fluid conduits 100 and a plurality of connection rings 180 and / or a plurality of connection plates 170 interconnecting any suitable number of double-walled fluid conduits 100 in an end-to-end manner. Additionally, although Figure 11 A flowchart schematically representing an illustrative, non-exclusive example of a method 500 according to the present disclosure is provided. The method 500 includes a method for forming a double-walled fluid conduit 100 and can also include a method of installing a double-walled fluid conduit 100 within a fluid handling system and / or forming a double-walled fluid transport system 10. In Figure 11 some steps are shown in dashed-line boxes, indicating that these steps can be optional or can correspond to optional versions of the method according to the present disclosure. That is, not all methods according to the present disclosure need to include the steps shown in solid-line boxes. As will be appreciated from the discussion herein, Figure 11 the methods and steps shown are not limiting, other methods and steps are within the scope of the present disclosure, including more or fewer methods than the number of steps shown. Additionally, the method 500 is not limited to the order of steps shown in Figures 1 to 10 without departing from the scope of the present disclosure, the steps of the method 500 can be performed in any suitable order or timing relative to one another.

[0073] Various steps or portions of the method 500 can be performed to form (optionally, assemble and / or install) a double-walled fluid conduit 100 and / or a double-walled fluid transport system 10 and / or portions thereof discussed in detail herein with reference to Figures 1 to 10 Accordingly, a double-walled fluid conduit 100 and / or a double-walled fluid transport system 10 formed according to the method 500 can include any of the features, functions, components, aspects, etc. discussed herein with reference to Figures 1 to 10 the same. Likewise, a double-walled fluid transport system 10 and / or a double-walled fluid conduit 100 shown and discussed herein can include any of the features, functions, components, aspects, etc. discussed herein with reference to Figures 11 to 13 the same. Likewise, a double-walled fluid transport system 10 and / or a double-walled fluid conduit 100 shown and discussed herein can include any of the features, functions, components, aspects, etc. discussed herein with reference to Figure 11Any of the features, functions, components, aspects, etc. discussed in relation to method 500, without requiring all of these features, functions, components, aspects, etc.

[0074] To more clearly illustrate Figures 12 to 13 the steps of method 500 schematically represented in Figures 12 to 13 FIG. 6, the following discussion refers to the structure of FIG. 6, which shows a specific example of a structure that can be formed by performing one or more steps of method 500. However, method 500 is not limited to Figures 12 to 13 the specific example shown, the structure formed by performing one or more steps of method 500 can include Figures 12 to 13 variations of the structure shown and Figures 12 to 13 other structures and / or can include Figure 11 any of the configurations, aspects, characteristics, properties, components, and / or features of the specific example shown and variations thereof, without necessarily including all of these configurations, aspects, characteristics, properties, components, and / or features.

[0075] As shown in Figures 2 to 11 Method 500 includes forming a double-walled fluid conduit in an additive manner at 510, which includes forming an outer tube wall surrounding an outer tube volume in an additive manner at 515 and forming an inner tube wall within the outer tube volume in an additive manner at 520. In some examples, method 500 includes forming a support structure in an additive manner on a build plate for supporting the double-walled fluid conduit at 505. Method 500 can also include forming a cap interconnecting the inner tube wall and the outer tube wall in an additive manner at 525, separating the double-walled fluid conduit from the build plate at 530, removing manufacturing powder from the double-walled fluid conduit at 535, heat treating the double-walled fluid conduit at 538, shaping a base of the double-walled fluid conduit at 540, forming a fastener hole in the double-walled fluid conduit at 545, installing a temporary fastener at 550, installing a sealing region at 555, separating the inner tube wall and the outer tube wall first flared end region at 560, and / or separating the inner tube wall and the outer tube wall from a second flared end region at 565. Method 500 can also include installing the double-walled fluid conduit at 570, removing the temporary fastener at 575, and / or repeating at 580.

[0076] Forming a double-walled fluid conduit 100 in an additive manner at 510 can include forming a double-walled fluid conduit in an additive manner as described herein with reference to Figure 11Any of the double-walled fluid conduits 100 shown and discussed. Additionally or alternatively, additive forming at 510 may be referred to as additively manufacturing and / or 3D printing of the double-walled fluid conduit 100. Additive forming at 510 includes any suitable additive forming method, examples of which include powder fusion (e.g., powder bed fusion), selective laser sintering, electron beam melting, and / or selective laser melting. Additional examples of suitable methods for additively forming the double-walled fluid conduit 100 include material extrusion, material jetting, sheet lamination, and direct energy deposition (which may include powder fusion and / or binder jetting). With this in mind, additive forming at 510 includes using any suitable material precursor to additively form the double-walled fluid conduit 100, which may be selected based on the specific additive forming method and / or the application of the double-walled fluid conduit 100.

[0077] like Figure 11 As shown, the additively formed double-walled fluid conduit 100 at 510 includes an outer tube wall at 515, which is additively formed around an inner tube volume 110 and defines a first flared end region 132 and an opposite second flared end region 134 of the outer tube. The additively formed double-walled fluid conduit 100 at 510 also includes an inner tube wall at 520, which is additively formed within the inner tube volume 110 such that an inter-tube passage 122 completely separates the inner tube outer surface 118 of the inner tube wall from the outer tube inner surface 108 of the outer tube wall, wherein the inner tube wall surrounds a central conduit 120 and defines a first flared end region 136 and an opposite second flared end region 138 of the inner tube. The inner and outer tube walls define interlocking geometries, such as those discussed in more detail herein.

[0078] The additive formation of the inter-tube wall at 520 includes additive formation of the inner tube 112 and / or is performed as part of the additive formation of the inner tube 112. Likewise, the additive formation of the outer tube 102 includes additive formation of the outer tube 102 and / or is performed as part of the additive formation of the outer tube 102. In particular, when the inner tube wall and the outer tube wall are mechanically decoupled from one another, the inner tube wall forms the inner tube 112 and the outer tube wall forms the outer tube 102. In some examples, the additive formation at 515 and the additive formation at 520 include forming the inner tube wall and the outer tube wall without structural interconnection therebetween, such that the additive formation at 520 includes forming the inner tube 112 and the additive formation at 515 includes forming the outer tube 102. In other examples, the additive formation of the double-walled fluid conduit 100 at 510 includes additive formation of a temporary interconnection support structure that interconnects and supports the inner tube wall and the outer tube wall relative to one another during one or more subsequent steps of the method 500. Utilization of a temporary interconnection support structure can be particularly desirable when the double-walled fluid conduit 100 and / or various components thereof (e.g., the inner tube wall and / or the outer tube wall) include complex structures that exceed the 45° overhang limit known to those skilled in the additive manufacturing art. In these examples, the method 500 further includes removing the temporary interconnection structure (e.g., via chemical milling) to mechanically decouple the inner tube wall from the outer tube wall and form the inner tube 112 and the outer tube 102 therefrom.

[0079] Additionally or alternatively, in some examples, the additive formation at 510 is performed on a build plate. In some such examples, the build plate is mounted on a multi-axis platform (e.g., a 5-axis system), which can allow the build plate to be rotated and tilted during the additive formation at 510. Rotation and tilting of the build plate can allow more aggressive geometries to be formed in the inner tube wall and / or the outer tube wall during the additive formation at 510, such as complex structures that exceed the 45° overhang limit, without the need to use temporary support structures or the like. Utilization of such a multi-axis platform can be particularly beneficial when the additive formation at 510 utilizes direct energy deposition and / or related techniques.

[0080] The additive formation at 515 and the additive formation at 520 can include additive formation of the inner tube wall from one or more materials that are the same as or different from the outer tube wall. As an example, the inner tube wall and the outer tube wall can be formed from additive manufacturing precursors that correspond to any of the one or more materials that can form the inner tube 112 and / or the outer tube 102 discussed herein. As a more particular example, when the inner tube 112 and / or the outer tube 102 are formed from one or more metals, and the additive formation at 515 and / or the additive formation at 520 includes powder fusion, the additive formation at 515 and / or the additive formation at 520 includes forming the inner tube wall and / or the outer tube wall utilizing one or more metal manufacturing powders as precursors.

[0081] The additive formation of the inner tube wall at 520 and the additive formation of the outer tube wall at 515 can be performed in any suitable order or timing within the method 500, such as at least substantially simultaneously with each other, after the additive formation of the support structure at 505, before the additive formation of the cap at 525, before or substantially simultaneously with the shaping of the base of the double-walled fluid conduit at 540, and / or before or substantially simultaneously with the formation of the fastener hole at 545.

[0082] In some examples, the additive formation of the double-walled fluid conduit 100 at 510 includes additive formation of the double-walled fluid conduit 100 on a build plate. As shown in Figure 12 In some such examples, the method 500 includes additive formation of the support structure on the build plate at 505, and the additive formation at 510 includes additive formation of the double-walled fluid conduit 100 on the support structure. The support structure can be configured to support the double-walled fluid conduit 100 on the build plate, temporarily interconnect the double-walled fluid conduit 100 with the build plate, and / or support the inner tube wall relative to the outer tube wall during the formation at 515, the formation at 520, and / or one or more subsequent steps of the method 500.

[0083] In some such examples, the additive formation at 510 includes interconnecting the inner tube first flared end region 136 of the inner tube wall and the outer tube first flared end region 132 of the outer tube wall with a connecting portion of the support structure to interconnect the inner tube first flared end region 136 with the outer tube first flared end region 132. In these examples, the support structure supports the inner tube wall and the outer tube wall relative to each other such that the inter-tube passage 122 separates the inner tube outer surface 118 from the outer tube inner surface 108. In some such examples, the additive formation at 505 and the additive formation at 510 include forming the support structure and the double-walled fluid conduit as a single structure and / or integral. When included, the additive formation of the support structure at 505 is performed in any suitable order or timing within the method 500, such as before the additive formation at 510, the additive formation at 520, and / or the additive formation at 525.

[0084] Figure 12 is a partial cross-sectional view showing an example of a support structure 200 that can be formed during the additive formation at 505 and / or can be used during the additive formation at 510. In particular, Figure 12A cross-section of an example double-walled fluid conduit 100 formed during additive forming at 510 and supported on a support structure 200 formed during additive forming at 505 is shown. As shown, the support structure 200 supports the double-walled fluid conduit 100 on a build plate 230, and the additive forming at 510 can be described as additively forming the double-walled fluid conduit 100 on or upward from the support structure 200. The inner wall first flared end region 136 of the inner wall 212 and the outer wall first flared end region 132 of the outer wall 202 are interconnected and / or integrally formed with the support structure 200, such that the support structure 200 supports the inner wall 212 and the outer wall 202 spaced apart, and an inter-tube channel 122 extends between the spaced-apart inner wall 212 and outer wall 202. In some examples, additively forming the support structure at 505 includes using the same materials and / or the same additive manufacturing process as the additive forming at 510.

[0085] As mentioned, in some examples, additive forming at 510 includes additively manufacturing the double-walled fluid conduit 100 using powder fusion, wherein manufacturing powder is fused to form the double-walled fluid conduit 100. In some such examples, it is desirable to remove residual manufacturing powder from within the double-walled fluid conduit 100 after additive forming at 510. In some such examples, the support structure 200 is configured to facilitate the removal of residual manufacturing powder from within the double-walled fluid conduit 100. For example, as... Figure 11 As shown, in some examples, additively forming the support structure at 505 includes: additively forming a support body 204 surrounding an open central region 206; forming a plurality of radial discharge channels 208 within the support body 204, which provide fluid communication between the open central region 206 and the exterior of the support body 204; and additively forming a plurality of discharge holes 210 extending through the top surface of the support body 204 to the plurality of radial discharge channels 208. The discharge channels 208 may be provided in a cathedral shape to reinforce the support body 204. In some examples, additive forming at 510 includes additively forming an inner tube wall 212 and an outer tube wall 202 on the support structure 200, such that the central tube 120 of the double-walled fluid conduit 100 is in fluid communication with the open central region 206 of the support structure 200 and the inter-tube passage 122 of the double-walled fluid conduit 100 is in fluid communication with the discharge holes 210. In these examples, the support structure 200 is configured to allow residual manufacturing powder present in the central conduit 120 of the double-walled fluid conduit 100 to be removed from the central conduit 120 via the open central region 206 and the radial discharge channel 208. Similarly, in these examples, the support structure 200 is configured to allow residual manufacturing powder present in the inter-pipe channel 122 to be removed from the inter-pipe channel 122 via the discharge port 210 and the radial discharge channel 208.

[0086] Turning again to Figure 12 In some examples, the method 500 includes forming a cap at 525 in an additive manner, the cap interconnecting the outer tube second flared end region 134 of the outer tube wall 202 and the inner tube second flared end region 138 of the inner tube wall 212. The cap can function to support the outer tube second flared end region 134 relative to the inner tube second flared end region 138 such that the interstitial passage 122 extends therebetween. The cap can be formed of the same or different material(s) as the inner tube wall 212 and / or the outer tube wall 202. In some examples, the cap is integral or forms a unitary structure with the inner tube wall 212 and / or the outer tube wall 202 and / or is formed via the same additive forming process. When included, the step of forming a cap at 525 in an additive manner is performed within the method 500 in any suitable order or timing, such as after the additive forming at 510, before the separating at 530, before the removing at 535, before the forming at 540, before the separating at 560, and / or before the separating at 565.

[0087] Figure 11 An example of a cap 220 that can be formed during the forming at 525 is shown. As shown, the cap 220 interconnects the inner tube second flared end region 138 with the outer tube second flared end region 134 and supports the inner tube wall 212 and the outer tube wall 202, the inner tube outer surface 118 being spaced apart from the outer tube inner surface 108 at least proximate or along the inner tube second flared end region 138 and the outer tube second flared end region 134. In this example, the cap 220 includes a disc formed on and interconnecting the inner tube base 144 of the inner tube second flared end region 138 and the outer tube base 152 of the outer tube second flared end region 134. The cap 220 also includes a cap open center region 222 aligned with the central passage 120 of the double-walled fluid conduit 100 and a plurality of cap holes 224 extending through an upper surface of the cap 220 to the interstitial passage 122. As discussed in greater detail herein, the cap holes 224 and the cap open center region 222 can be used to vent residual manufacturing powder from within the double-walled fluid conduit 100.

[0088] Continuing with reference to Figure 12In some examples, the method 500 includes separating 530 the double-walled fluid conduit 100 from the build plate 230. In particular, the method 500 includes separating 530 when performing the additive shaping at 510 on the build plate 230. The separation at 530 includes any suitable method of disengaging the inner tube first flared end region 136 and the outer tube second flared end region 132 from the build plate 230. As a more particular example, when the method 500 includes forming the support structure 200 in an additive manner at 505 and the additive shaping at 510 includes interconnecting the double-walled fluid conduit 100 with the support structure 200, the separation at 530 can include separating a connecting portion of the support structure 200 that is directly connected to the double-walled fluid conduit 100 from a base portion of the support structure 200 that contacts the build plate 230. In these examples, the base portion of the support structure 200 interconnects the inner tube wall 212 and the outer tube wall 202 after the separation at 530. In these examples, the connecting portion of the support structure 200 is separated from the base portion of the support structure using any suitable process, such as milling, machining, and / or cutting. As Figure 11 As shown in the example of FIG. 5, the connecting portion 226 of the support structure 200 interconnects the inner tube base 144 of the inner tube first flared end region 136 with the outer tube base 152 of the outer tube first flared end region 132, and the base portion 228 of the support structure 200 contacts the build plate 230. After the separation at 530, the connecting portion 226 of the support structure 200 supports the outer tube wall 202 relative to the inner tube wall 212 to maintain the hook of the inner tube wall 212 relative to the outer tube wall 202 during subsequent steps of the method 500.

[0089] In other examples, the separation at 530 includes removing the entire support structure 200 from the double-walled first flared end region 140 of the double-walled fluid conduit 100, such that the separation at 530 includes separating the inner tube wall 212 and the outer tube wall 202 from the first flared end region at 560.

[0090] When included, the separation at 530 is performed within the method 500 in any suitable order or timing, such as before the removal at 535, after the removal at 535, before the shaping at 540, before the separation at 560, substantially simultaneously with the separation at 560, and / or before the separation at 565.

[0091] Continuing with reference to Figure 12In some examples, method 500 includes removing manufacturing powder from within the double-walled fluid conduit at 535. Specifically, removal at 535 is performed when additive forming at 510 involves one or more powder fusion processes, and residual manufacturing powder remains within the double-walled fluid conduit 100 (e.g., within the central conduit 120 and / or the inter-conduit channel 122) after additive forming at 510. Removal at 535 includes any suitable process for removing residual manufacturing powder from within the double-walled fluid conduit 100, such as flowing, blowing, and / or pushing the residual manufacturing powder within the double-walled fluid conduit 100. See reference. Figure 11 In some examples, removal at 535 includes forcing fluid (e.g., air) from the open central region 222 into the central conduit 120 to allow residual manufacturing powder to flow from the central conduit 120 through the open central region 206 and the radial discharge channel 208 of the support structure 200. Similarly, in some examples, removal at 535 includes forcing fluid through the cap orifice 224 into the inter-pipe channel 122 to allow residual manufacturing powder to flow from the inter-pipe channel 122 through the discharge orifice 210 and the radial discharge channel 208 of the support structure 200.

[0092] When included, removal at 535 is performed within method 500 in any suitable order or timing. In some examples, removal at 535 is performed before separation at 530 and / or within the additive manufacturing apparatus, allowing residual manufacturing powder to be collected and recovered. Alternatively or additionally, removal at 535 is performed after separation at 530. As further examples, removal at 535 may be performed before heat treatment at 538, before formation at 545, and / or before installation of temporary fasteners at 550.

[0093] like Figure 11 As shown, in some examples, method 500 includes heat treatment of the double-walled fluid conduit 100 at 538. In some examples, the heat treatment at 538 includes heat treatment of the inner wall 212 and / or the outer wall 202 after formation at 515 and / or 520, to, for example, strengthen the inner wall 212 and / or the outer wall 202. Specifically, when additive forming at 515 and / or additive forming at 520 involves powder fusion of one or more metal powders and / or selective laser sintering of one or more metal powders, heat treatment of the inner wall 212 and / or the outer wall 202 may be performed to strengthen, harden, homogenize, stress-relieve, sinter, and / or degrade the sintered or fused metal powders. When method 500 includes removing excess manufacturing powder from the double-walled fluid conduit 100 at 535 and heat treatment at 538, it is preferable to perform the heat treatment at 538 after the removal at 535 so that the residual manufacturing powder does not bind within the double-walled fluid conduit 100 during the heat treatment at 538.

[0094] With continued reference to Figure 13 In some examples, the method 500 includes shaping 540 the base of the double-walled fluid conduit. The shaping at 540 can include shaping the inner tube base 144 of the inner tube first flared end region 136, the inner tube base 144 of the inner tube second flared end region 138, the outer tube base 152 of the outer tube first flared end region 132, and / or the outer tube base 152 of the outer tube second flared end region 134. In some examples, the shaping at 540 includes shaping the inner tube base 144 and the outer tube base 152 to be flush, aligned, or planar with one another. Additionally or alternatively, the shaping at 540 includes forming a complex shape in the inner tube base 144 and / or the outer tube base 152 that is configured to interface with an external component and / or another double-walled fluid conduit 100. The shaping 540 is performed via any suitable process such as milling, machining, and / or cutting. Additionally or alternatively, the shaping at 540 is performed during the additive shaping at 510, where the inner tube base 144 and / or the outer tube base 152 are formed in the desired shape and / or dimensions in an additive manner.

[0095] In some examples, the shaping at 540 includes removing the sacrificial sections of the connecting portion 226 of the support structure 200 from the inner tube base 144 of the inner tube first flared end region 136 and the outer tube base 152 of the outer tube first flared end region 132. In some examples, the shaping at 540 is performed without breaking the inner tube base 144 of the first inner tube flared end region 136 and the outer tube base 152 of the outer tube first flared end region 132. As an example, as shown in the example of FIG. 6, the shaping at 540 can include removing the sacrificial portion of the connecting portion 226 such that the bridging section 232 of the connecting portion 226 remains and interconnects the inner tube base 144 of the inner tube first flared end region 136 and the outer tube base 152 of the outer tube first flared end region 132. Figure 13 In other examples, the shaping at 540 includes breaking the inner tube base 144 from the outer tube base 152, for example via removing the entire connecting portion 226 of the support structure 200 from the double-walled fluid conduit 100. In these examples, the shaping at 540 includes separating the inner and outer tube first flared end regions (136, 132) at 560.

[0096] Similarly, for some examples in which the method 500 includes forming the cap 220 in an additive manner at 525, the shaping at 540 includes removing at least some or all of the cap 220. As an example, as shown in the example of FIG. 6, the shaping at 540 can include removing the cap 220 such that the inner tube base 144 of the inner tube first flared end region 136 and the outer tube base 152 of the outer tube first flared end region 132 are exposed. Figure 11As shown, in some examples, the shaping at 540 includes removing the sacrificial portion of the cap 220 from the inner tube base 144 of the inner tube second flared end region 138 and from the outer tube base 152 of the outer tube second flared end region 134, while leaving the cap bridge section 234 of the cap 220 that interconnects the inner tube base 144 of the inner tube second flared end region 138 with the outer tube base 152 of the outer tube second flared end region 134. In other examples, the shaping at 540 includes removing the entire cap 220, for example to disconnect the inner tube second flared end region 138 from the outer tube second flared end region 134. In these examples, the shaping at 540 includes the separating at 565.

[0097] When included, the shaping at 540 is performed within the method 500 in any suitable order or timing, examples including after the separating at 530, before the forming the fastener hole at 545, after the forming the fastener hole at 545, before the installing the sealing region at 555, and / or before and / or substantially contemporaneous with the separating at 560 and / or the separating at 565.

[0098] Continuing with reference to Figure 13 In some examples, the method 500 includes forming a plurality of fastener holes in the double-walled fluid conduit 100 at 545. In some examples, the forming at 545 includes forming a plurality of inner tube fastener holes 128 in the double-walled fluid conduit 100. Specifically, in some examples, the forming at 545 includes forming a plurality of first end inner tube fastener holes 128 in the double-walled first flared end region 140 of the double-walled fluid conduit 100, for example as discussed in greater detail herein. Additionally or alternatively, in some examples, the forming at 545 includes forming a plurality of second end inner tube fastener holes 128 in the double-walled second flared end region 142 of the double-walled fluid conduit 100, for example as discussed in greater detail herein. In some examples, the forming a plurality of inner tube fastener holes 128 includes forming a plurality of fastener receiving regions 127 in the inner tube wall 212 and / or forming a plurality of sealing receiving regions 129 in the outer tube wall 202, for example as discussed in greater detail herein.

[0099] In some examples, the forming at 545 includes forming a plurality of outer tube fastener holes 148 in the double-walled fluid conduit 100. Specifically, in some examples, the forming at 545 includes forming a plurality of first end outer tube fastener holes 148 in the double-walled first flared end region 140 of the double-walled fluid conduit 100, for example as discussed herein. Additionally or alternatively, in some examples, the forming at 545 includes forming a plurality of second end outer tube fastener holes 148 in the double-walled second flared end region 142 of the double-walled fluid conduit 100, for example as discussed in greater detail herein.

[0100] In some examples, the forming at 545 is performed at the same time as the forming of the plurality of fastener holes in at least a portion of the support structure 200, e.g., the connecting portion 226 or the bridge segment 232, interconnecting the inner tube first flared end region 136 with the outer tube first flared end region 132. Additionally or alternatively, in some examples, the forming at 545 is performed at the same time as the forming of at least a portion of the cap 220, e.g., the cap bridge segment 234, interconnecting the inner tube second flared end region 138 with the outer tube second flared end region 134. In some examples, the forming at 545 includes forming at least one inter-tube port 190 in the outer tube wall 202, e.g., as discussed in more detail herein.

[0101] Figure 11 Examples of the forming at 545 including forming a plurality of first end inner tube fastener holes 128 in the double-walled first flared end region 140 and a plurality of second end inner tube fastener holes 128 in the double-walled second flared end region 142, at the same time as the bridge segment 232 of the support structure 200 interconnects the inner tube first flared end region 134 and the outer tube first flared end region 132 and at the same time as the cap bridge segment 234 interconnects the inner tube second flared end region 138 with the outer tube second flared end region 134, are illustrated. As shown in these examples, the inner tube fastener holes 128 formed during the forming at 545 include a seal-receiving region 129 in the outer tube wall 202 and a fastener-receiving region in the inner tube wall 212.

[0102] In some examples, the forming at 545 is performed after the forming of the double-walled fluid conduit 100 at 510 and includes any suitable material removal process for forming holes having suitable dimensions and shapes within the double-walled fluid conduit 100, examples including drilling, tapping, boring, counter-sinking, and / or combinations thereof. Additionally or alternatively, in some examples, the forming at 545 is performed substantially simultaneously with or as part of the forming of the double-walled fluid conduit 100 at 510 in an additive manner. In particular, in some such examples, the additive shaping at 510 includes forming the inner tube wall 212 in an additive manner at 520 and / or forming the outer tube wall 202 in an additive manner at 515, the inner tube fastener holes 128 extending through the same. Additionally or alternatively, in some such examples, the forming at 515 includes forming the outer tube wall 202 in an additive manner, the outer tube fastener holes 148 extending through the same.

[0103] When included, the forming at 545 is performed within the method 500 in any suitable order or timing, e.g., after the forming at 510, substantially simultaneously with the forming at 510, after the shaping at 540, before the shaping at 540, before the installing of the temporary fasteners at 550, before the separating at 560, before the separating at 565, and / or before the installing at 570.

[0104] AsFigure 11 As shown, in some examples, method 500 includes installing a plurality of temporary fasteners at 550 in at least a subset of the inner tube fastener holes. Specifically, the installation at 550 may include installing temporary fasteners in at least some of the first-end inner tube fastener holes 128 and / or installing temporary fasteners in at least some of the second-end inner tube fastener holes 128. When included, once the inner tube wall 212 and the outer tube wall 202 are completely separated from each other (e.g., after separation at 560, after separation at 565, and / or during a portion of the installation at 570), the temporary fasteners are configured to operatively engage the inner tube wall 212 with the outer tube wall 202 to, for example, maintain a hook between the inner tube wall 212 and the outer tube wall 202 and / or support the inner tube wall 212 relative to the outer tube wall 202. In some examples, the temporary fastener is configured to engage with the outer tube wall 202 via the sealing receiving area 129 of the inner tube fastener hole 128 and with the inner tube wall 212 via the fastener receiving area 127 of the inner tube fastener hole 128. When included, the installation of the temporary fastener at 550 is performed within method 500 in any suitable order or timing, such as before separation at 560, before separation at 565, before installation at 570, before removal at 575, and / or after forming the fastener hole at 545.

[0105] like Figure 11 As shown, in some examples, method 500 includes installing at least one sealing region at 555 along at least one base of the double-walled fluid conduit 100. In some examples, installation at 555 includes installing at least one inner tube sealing region 154 along at least one inner tube base 144 of the inner tube wall 212 and / or the inner tube 112. More specifically, in some examples, installation at 555 includes installing the inner tube sealing region 154 along the inner tube base 144 of the first flared end region 136 of the inner tube and / or along the inner tube base 144 of the second flared end region 138 of the inner tube. In some examples, installation at 555 includes installing at least one outer tube sealing region 156 along at least one outer tube base 152 of the outer tube wall 202 and / or the outer tube 102. More specifically, in some examples, the installation at 555 includes installing an outer tube sealing region 156 along the outer tube base 152 of the first flared end region 132 of the outer tube and / or installing an outer tube sealing region 156 along the outer tube base 152 of the second flared end region 134 of the outer tube.

[0106] Installing sealing regions at 555 can include installing any of the sealing regions discussed herein. As a more specific example, installing inner tube sealing region 154 can include forming one or more circular grooves along inner tube base 144 and inserting one or more O-rings in the one or more circular grooves. Likewise, installing outer tube sealing region 156 can include forming one or more grooves along outer tube base 152 and installing one or more O-rings in the one or more grooves.

[0107] When included, installing one or more sealing regions at 555 is performed within method 500 in any suitable order or timing, such as after shaping at 540, before or after forming fastener holes at 545, after installing temporary fasteners at 550, after separating at 560, and / or after separating at 556, and / or before installing at 570.

[0108] Continuing with reference to Figure 13 In some examples, method 500 includes separating inner tube first flared end region 136 from outer tube first flared end region 132 at 560. After separating at 560, inter-tube passage 122 separates inner tube first flared end region 136 from outer tube first flared end region 132 completely. That is, in some examples, temporary fasteners interconnect inner tube first flared end region 136 and outer tube first flared end region 132 during and / or after separating at 560.

[0109] In particular, method 500 includes separating at 560, such as where inner tube first flared end region 136 and outer tube first flared end region 132 are interconnected, such as during additive shaping at 510. In some examples, separating at 560 includes removing any remaining portions of support structure 200, such as connecting portions 226 and / or bridging segments 232, from double-walled first flared end region 140 of double-walled fluid conduit 100. As noted, in some examples, separating at 560 is performed during shaping at 540, where an entire connecting portion 226 of support structure 200 is removed from double-walled first flared end region 140. In other examples, separating at 560 includes removing bridging segments 232 of support structure 200 that interconnect inner tube wall 212 and outer tube wall 202 with one another after shaping at 540. Referring to Figure 11 For a more specific example, separating at 560 can include removing bridging segments 232 of support structure 200 by forming a ring between inner tube base 144 and outer tube base 152 of double-walled first flared end region 140, such that inter-tube passage 122 extends therebetween.

[0110] When included, the separation at 560 is performed within the method 500 in any suitable order or timing, such as before, at least substantially contemporaneous with, or after the separation at 565, after the forming of the fastener hole at 545, after the shaping at 540, after the installation of the temporary fastener at 545 and / or before the installation at 570, before the removal at 575, and / or before the repeating at 580.

[0111] As Figures 1 to 10 As further shown in FIG. 5, in some examples, the method 500 includes separating the inner tube second flared end region 138 from the outer tube second flared end region 134 at 565. After the separation at 565, the inter-tube passage 122 fully separates the inner tube second flared end region 138 from the outer tube second flared end region 134. That is, in some examples, during or after the separation at 565, the temporary fastener interconnects the inner tube second flared end region 138 and the outer tube second flared end region 134. When the inner tube wall 212 and the outer tube wall 202 are fully separated from one another by the inter-tube passage 122 (e.g., after the separation at 560 and / or the separation at 565), the inner tube wall 212 forms the inner tube 112 and the outer tube wall 202 forms the outer tube 102, and the double-walled fluid conduit 100 can include any of the examples of double-walled fluid conduits 100 shown and discussed herein with reference to FIGS. 1-4. Figure 13 As further shown in FIG. 5, in some examples, the method 500 includes separating the inner tube second flared end region 138 from the outer tube second flared end region 134 at 565. After the separation at 565, the inter-tube passage 122 fully separates the inner tube second flared end region 138 from the outer tube second flared end region 134. That is, in some examples, during or after the separation at 565, the temporary fastener interconnects the inner tube second flared end region 138 and the outer tube second flared end region 134. When the inner tube wall 212 and the outer tube wall 202 are fully separated from one another by the inter-tube passage 122 (e.g., after the separation at 560 and / or the separation at 565), the inner tube wall 212 forms the inner tube 112 and the outer tube wall 202 forms the outer tube 102, and the double-walled fluid conduit 100 can include any of the examples of double-walled fluid conduits 100 shown and discussed herein with reference to FIGS. 1-4.

[0112] In particular, the method 500 includes the separation at 565, such as where the inner tube second flared end region 138 and the outer tube second flared end region 134 are interconnected, such as during the forming at 525. More particularly, in some examples, the separation at 565 includes removing any remaining portion of the cap 220 from the double-walled second flared end region 142 of the double-walled fluid conduit 100. As noted, in some examples, the separation at 565 is performed during the shaping at 540, where the entire cap 220 is removed from the double-walled second flared end region 142. In other examples, the separation at 565 includes removing the cap bridge section 234 of the cap 220 that interconnects the inner tube wall 212 and the outer tube wall 202 to one another. Referring to FIG. 5, in some examples, the separation at 565 includes removing the cap bridge section 234 of the cap 220 that interconnects the inner tube wall 212 and the outer tube wall 202 to one another. Figure 11 For a more particular example, the separation at 565 can include removing the cap bridge section 324 from the double-walled second flared end region 142 by forming a loop between the inner tube base 144 and the outer tube base 152 such that the inter-tube passage 122 fully separates the inner tube base 144 and the outer tube base 152 of the double-walled second flared end region 142.

[0113] When included, the separation at 565 is performed within method 500 in any suitable order or timing, such as before, at least substantially simultaneously with or after, the separation at 560, after the fastener hole is formed at 545, after the forming at 540, after the temporary fastener is installed at 550 and / or before the installation at 570, before the temporary fastener is removed at 575 and / or before the repetition at 580.

[0114] Separation at 560 and / or separation at 565 may include any suitable process for separating the inner tube wall 212 from the outer tube wall 202, including material removal processes such as milling, machining, cutting and / or combinations thereof.

[0115] like Figure 11 As shown, in some examples, method 500 further includes installing the double-walled fluid conduit 100 within the fluid handling system 26 and / or the double-walled fluid transport system 10 at 570. Installing the double-walled fluid conduit 100 within the fluid handling system 26 can include installing the double-walled fluid conduit 100 within any fluid handling system discussed herein (e.g., the fluid handling system 26 of the aircraft 12). In some such examples, the installation at 570 includes interconnecting a first flared end region 140 of the double wall with a fluid inlet and / or a fluid outlet of the fluid handling system 26 and interconnecting a second flared end region 142 of the double wall with another of the fluid inlet and fluid outlet to provide fluid communication between them. In some such examples, the installation at 570 includes interconnecting the inter-pipe passage 122 of the double-walled fluid conduit 100 with a first fluid passage for a fluid inlet and a fluid outlet, and interconnecting the central pipe 120 of the double-walled fluid conduit 100 with a second fluid passage for a fluid inlet and a fluid outlet, such that the double-walled fluid conduit 100 provides fluid communication between the first and second fluid passages of the fluid handling system 26, as discussed herein. In these examples, the double-walled fluid conduit 100 can be described as forming a double-walled fluid transport system 10. In some such examples, the double-walled fluid conduit 100 is interconnected to the fluid inlet and fluid outlet of the double-walled fluid transport system 10 using inner pipe fasteners 130 and outer pipe fasteners 150, which may support an inner pipe 112 spaced apart from an outer pipe 102, with the inter-pipe passage 122 extending between the inner pipe 112 and the outer pipe 102, as discussed herein.

[0116] Additionally or alternatively, the installing at 570 can include interconnecting the double-walled fluid conduit 100 with at least one other double-walled fluid conduit 100 to form a plurality of interconnected double-walled fluid conduits 100. More particularly, the interconnecting can include providing fluid communication between the interstitial passages 122 and / or the central conduits 120 of the plurality of interconnected double-walled fluid conduits 100. In some such examples, the double-walled fluid conduit 100 is a first double-walled fluid conduit 100 and the interconnecting includes interconnecting the double-walled fluid conduit 100 with a second double-walled fluid conduit 100. In some such examples, interconnecting the first double-walled fluid conduit 100 with the second double-walled fluid conduit 100 includes installing a connection ring 180 within the end region of the interstitial passages 122 of the first double-walled fluid conduit 100 and the second double-walled fluid conduit 100, such as discussed herein. In some such examples, the connection ring 180 is used as an alignment device to assist in aligning the inner tube 112 and / or the outer tube 102 during interconnecting the first and second double-walled fluid conduits 100. In some such examples, interconnecting the first and second double-walled fluid conduits 100 includes interconnecting and / or forming a fluid seal between the inner tube base 144 of the first double-walled fluid conduit 100 and the inner tube base 144 of the second double-walled fluid conduit 100, such as via or with the inner tube fastener apertures 128 and the inner tube fasteners 130, as discussed herein. Additionally or alternatively, in some such examples, interconnecting the first and second double-walled fluid conduits 100 includes interconnecting and / or forming a fluid seal between the outer tube base 152 of the first double-walled fluid conduit 100 and the outer tube base 152 of the second double-walled fluid conduit 100, such as via or with the outer tube fastener apertures 148 and the outer tube fasteners 150.

[0117] Additionally or alternatively, in some examples, interconnecting the first double-walled fluid conduit 100 and the second double-walled fluid conduit 100 includes operatively coupling and / or forming a fluid seal between one face of the connection plate 170 and the inner tube base 144 and / or the outer tube base 152 of the first double-walled fluid conduit 100 and operatively coupling and / or forming a fluid seal between another face of the connection plate 170 and the inner tube base 144 and / or the outer tube base 152 of the second double-walled fluid conduit 100, such as discussed in greater detail herein. In these examples, the inner tube fastener apertures 128, the inner tube fasteners 130, the outer tube fastener apertures 148, and / or the outer tube fasteners 150 can be used to interconnect the first and second double-walled fluid conduits 100 with the connection plate 170, such as discussed herein.

[0118] In some examples, the installing at 570 also includes interconnecting the first double-walled fluid conduit 100 with a third double-walled fluid conduit 100. In these examples, the installing includes interconnecting the double-walled first flared end region 140 of the first double-walled fluid conduit 100 with the second double-walled fluid conduit 100 and interconnecting the double-walled second flared end region 142 of the first double-walled fluid conduit 100 with the third double-walled fluid conduit 100, e.g., via the same or different methods and / or the same or different connecting structures discussed herein for interconnecting the first and second double-walled fluid conduits 100.

[0119] When the installing at 570 includes interconnecting the first double-walled fluid conduit 100 with a second and optionally a third double-walled fluid conduit 100, the installing can also include installing the plurality of interconnected double-walled fluid conduits 100 within a fluid handling system 26, e.g., as discussed herein. In some such examples, the installing at 570 includes interconnecting the interconnected double-walled fluid conduit 100 with adjacent structures within the double-walled fluid transport system 10 other than the fluid inlet and fluid outlet, e.g., by interconnecting the connecting plate 170 with the adjacent structures, e.g., as discussed herein.

[0120] In some examples, the installing at 570 includes installing the inner tube fastener 130 within the fastener-receiving region 127 of the inner tube fastener aperture 128 and installing the inter-tube seal member 146 within the seal-receiving region 129 of the inner tube fastener aperture 128, e.g., as discussed herein. Also, in some examples, the installing at 570 includes installing the outer tube fastener 150 in the outer tube fastener aperture 148, e.g., as discussed herein. In some examples, the installing at 570 also includes installing at least one inter-tube port seal member in at least one inter-tube port 190.

[0121] When included, the installing at 570 is performed within the method 500 in any suitable order or timing, e.g., after the additive shaping at 515, after the separating at 530, after the shaping at 540, after the forming at 545, after the installing at 550, after the installing at 555, after the separating at 560, and / or after the separating at 560 and / or substantially simultaneously with or after the removing the temporary fastener at 570 and / or before, substantially simultaneously with, and / or after the repeating at 580.

[0122] When the method 500 includes installing the temporary fastener at 550, the method 500 also includes removing the temporary fastener at 575. The removing at 575 includes mechanically decoupling the inner tube 112 from the outer tube 102. When included, the removing at 575 can be performed before or during the installing at 570. In particular, the removing at 575 can include replacing the temporary fastener with the inner tube fastener 130 during the installing at 570, such that the inner tube 112 remains hooked to the outer tube 102 during the installing at 570.

[0123] With continued reference to ​ In some examples, the method 500 includes repeating at 580. When included, the repeating at 580 includes repeating any desirable number or combination of steps of the method 500 and / or repeating any desirable number of steps of the method 500 in any suitable order. In some examples, the repeating at 580 is performed to form a plurality of double-walled fluid conduits 100, including repeating the forming at 510, optionally in combination with repeating any one or more additional steps of the method 500 to form the plurality of double-walled fluid conduits 100 having a desired configuration. The plurality of double-walled fluid conduits 100 formed according to the repeating at 580 can have the same configuration or a plurality of different configurations, for example by repeating the same or various different steps of the method 500 in combination with the additive shaping at 510 and / or by performing the additive shaping at 510 according to the same or different processes. In some examples, the repeating at 580 includes repeating the installing at 570 to interconnect any suitable number of double-walled fluid conduits 100 with each other, such as at least 3, at least 4, at least 5, at least 6, at least 10, at most 10, at most 20, and / or at most 100 double-walled fluid conduits 100. In some examples, the repeating at 580 includes forming a plurality of double-walled fluid conduits 100 and interconnecting the plurality of double-walled fluid conduits 100 with each other. Additionally or alternatively, in some examples, the repeating at 580 includes repeating the installing 570 to install a plurality of double-walled fluid conduits 100 at different locations within the double-walled fluid transport system 10 and / or to interconnect a plurality of different fluid inlets and fluid outlets.

[0124] Exemplary, non-exclusive examples of the inventive subject matter in accordance with the present disclosure are described in the following enumerated paragraphs:

[0125] A1. A double-walled fluid transport system (10), the system (10) comprising:

[0126] at least one double-walled fluid conduit (100), the at least one double-walled fluid conduit (100) comprising:

[0127] an outer tube (102) comprising a pair of outer tube flared end regions (104) and an outer tube central region (106) extending between the pair of outer tube flared end regions (104), wherein the outer tube central region (106) and the pair of outer tube flared end regions (104) define an outer tube inner surface (108) surrounding an outer tube inner volume (110); and

[0128] an inner tube (112) defining a central conduit (120) and extending within the outer tube inner volume (110), wherein the inner tube (112) includes a pair of inner tube flared end regions (114) and an inner tube central region (116) extending between the pair of inner tube flared end regions (114), and wherein the inner tube central region (116) and the pair of inner tube flared end regions (114) define an inner tube outer surface (118); and

[0129] wherein the inner tube (112) and the outer tube (102) define an interlocking geometry, and wherein the inner tube (112) and the outer tube (102) are sized and shaped to be supported such that the inter-tube passage (122) completely separates the inner tube outer surface (118) from the outer tube inner surface (108).

[0130] A2. The system (10) of paragraph Al, wherein the outer tube (102) is unitary.

[0131] A2.1. The system (10) of any of paragraphs Al-A2, wherein the inner tube (112) is unitary.

[0132] A2.2. The system (10) of any of paragraphs Al-A2.1, wherein the inner tube (112) cannot be removed from the outer tube (102) without damaging or destroying one or more of the inner tube (112) and the outer tube (102).

[0133] A3. The system (10) of any of paragraphs Al-A2.1, wherein the inner tube outer surface (118) and the outer tube inner surface (108) are substantially parallel.

[0134] A4. The system (10) of any of paragraphs Al-A3, wherein the inner tube outer surface (118) and the outer tube inner surface (108) are concentric.

[0135] A5. The system (10) of any of paragraphs Al-A4, wherein each of the pair of inner tube flared end regions (114) defines an inner tube outermost lateral dimension (124), wherein along the outer tube central region (106), the outer tube inner surface (108) defines an outer tube passage outermost lateral dimension (126), and wherein the inner tube outermost lateral dimension (124) is greater than the outer tube passage outermost lateral dimension (126).

[0136] A6. The system (10) of any of paragraphs Al-A5, wherein the inner tube (112) and the outer tube (102) are sized and shaped to be supported such that the outer tube inner surface (108) and the inner tube outer surface (118) do not contact.

[0137] A7. The system (10) of any of paragraphs A1-A6, wherein the inner tube flared end region pair (114) includes an inner tube first flared end region (136) and an inner tube second flared end region (138) opposite the inner tube first flared end region (136), wherein the outer tube flared end region pair (104) includes an outer tube first flared end region (132) and an outer tube second flared end region (134) opposite the outer tube first flared end region (132), and wherein the at least one double-walled fluid conduit (100) includes a double-walled first flared end region (140) defined by the inner tube first flared end region (136) and the outer tube first flared end region (132) and a double-walled second flared end region (142) defined by the inner tube second flared end region (138) and the outer tube second flared end region (134).

[0138] A7.1. The system (10) of paragraph A7, wherein the at least one double-walled fluid conduit (100) includes a plurality of inner tube fastener holes (128) disposed about at least one of the double-walled first flared end region (140) and the double-walled second flared end region (142), and wherein the plurality of inner tube fastener holes (128) are configured to cooperate with a plurality of inner tube fasteners (130) to operatively couple the inner tube (112) to an adjacent structure.

[0139] A7.1.1. The system (10) of paragraph A7.1, wherein the plurality of inner tube fastener holes (128) includes a plurality of first end inner tube fastener holes (128) disposed about the double-walled first flared end region (140), and wherein the plurality of first end inner tube fastener holes (128) extend through an outer tube outer surface (109) of the outer tube first flared end region (132) from an inner tube base (144) of the inner tube first flared end region (136).

[0140] A7.1.2. The system (10) of any of paragraphs A7.1-A7.1.1, wherein each inner tube fastener hole (128) includes a fastener receiving region (127) positioned within the inner tube (112) and configured to receive an inner tube fastener (130) and a seal receiving region (129) positioned within the outer tube (102) and configured to receive an inter-tube sealing member (146).

[0141] A7.1.3. The system (10) of any of paragraphs A7.1-A7.1.2, wherein the plurality of inner tube fastener holes (128) includes a plurality of second end inner tube fastener holes (128) disposed about the double-walled second flared end region (142).

[0142] A7.2. The system (10) of any of paragraphs A7-A7.1.3, further comprising a plurality of outer tube fastener holes (148) positioned along at least one of the double-walled first flared end region (140) and the double-walled second flared end region (142) and configured to cooperate with the plurality of outer tube fasteners (150) to operatively couple the outer tube (102) to an adjacent structure.

[0143] A7.2.1. The system (10) of paragraph A7.2, wherein the plurality of outer tube fastener holes (148) comprises a plurality of first end outer tube fastener holes (148) positioned along the double-walled first flared end region (140) and extending through an outer tube outer surface (109) of the outer tube first flared end region (132) from an outer tube base (152) of the outer tube first flared end region (132).

[0144] A7.2.2. The system (10) of any of paragraphs A7.2-A7.2.1, wherein the plurality of outer tube fastener holes (148) comprises a plurality of second end outer tube fastener holes (148) positioned along the double-walled second flared end region (142).

[0145] A8. The system (10) of any of paragraphs A1-A7.2.2, further comprising at least one inner tube sealing region (154) disposed about at least one inner tube base (144) of the inner tube (112).

[0146] A9. The system (10) of any of paragraphs A1-A8, further comprising at least one outer tube sealing region (156) disposed about at least one outer tube base (152) of the outer tube (102).

[0147] A10. The system (10) of any of paragraphs A1-A9, wherein the double-walled fluid conduit (100) comprises a double-walled center region (158) defined by the inner tube center region (116) and the outer tube center region (106), and wherein the double-walled center region (158) comprises one of a curved configuration (160) and a straight configuration (162).

[0148] A11. The system (10) of any of paragraphs A1-A10, wherein the system (10) comprises a plurality of double-walled fluid conduits (100).

[0149] A11.1. The system (10) of paragraph A11, further comprising a connecting plate (170) configured to interconnect adjacent double-walled fluid conduits (100) to one another, and wherein the connecting plate (170) is configured to support the inner tube (112) and the outer tube (102) of the adjacent double-walled fluid conduits (100) such that the inter-tube passage (122) completely separates the inner tube outer surface (118) from the outer tube inner surface (108) at least in the vicinity of the connecting plate (170).

[0150] A11.1.1. The system (10) of paragraph A11.1, wherein the connecting plate (170) comprises: a connecting plate center conduit (172) configured to provide fluid communication between the center conduits (120) of the adjacent double-walled fluid conduits (100); a fluid permeable inter-tube region (174) configured to provide fluid communication between the inter-tube passages (122) of the adjacent double-walled fluid conduits (100); a plurality of outer tube coupling portions (176) configured to operatively couple to the outer tubes (102) of the adjacent double-walled fluid conduits (100); and a plurality of inner tube coupling portions (178) configured to operatively couple to the inner tubes (112) of the adjacent double-walled fluid conduits (100).

[0151] A11.2. The system (10) of any of paragraphs A11-A11.1.1, further comprising a connecting ring (180) configured to be positioned between the inner tube base (144) and the outer tube base (152) and to support the inner tube (112) and the outer tube (102) such that the inter-tube passage (122) completely separates the inner tube outer surface (118) from the outer tube inner surface (108) at least in the vicinity of the connecting ring (180).

[0152] A11.2.1. The system (10) of paragraph A11.2, when dependent on paragraph A11, wherein the connecting ring (180) is configured to be positioned within an end region of the inter-tube passage (122) of the adjacent double-walled fluid conduits (100) and to support the outer tube (102) and the inner tube (112) of each of the adjacent double-walled fluid conduits (100) spaced apart with the inter-tube passage (122) extending between the spaced apart outer tube (102) and inner tube (112), and wherein the connecting ring (180) is configured to provide fluid communication between the inter-tube passages (122) of the adjacent double-walled fluid conduits (100).

[0153] A11.2.2. The system (10) of any of paragraphs A11.2-A11.2.1, wherein the connection ring (180) comprises a connection ring body (182) defining an outer radial surface (184) and an inner radial surface (186), wherein the connection ring body (182) comprises a plurality of inboard notches (188) disposed about the inner radial surface (186) and a plurality of outboard notches (192) disposed about the outer radial surface (184), wherein the plurality of inboard notches (188) are offset relative to the plurality of outboard notches (192), and wherein the plurality of inboard notches (188) and the plurality of outboard notches (192) are configured to provide fluid communication between the inter-tube passages (122) of adjacent double-walled fluid tubes (100).

[0154] A12. The system (10) of any of paragraphs A1-A11.2.2, wherein the central tube (120) is configured to transport a first fluid and the inter-tube passage (122) is configured to transport a second fluid.

[0155] A13. The system (10) of any of paragraphs A1-A12, wherein the inter-tube passage (122) is configured to isolate a mechanical failure from propagating between the inner tube (112) and the outer tube (102).

[0156] A14. The system (10) of any of paragraphs A1-A13, wherein the inter-tube passage (122) is configured to thermally insulate the inner tube (112) from the outer tube (102).

[0157] A15. Use of the system (10) of any of paragraphs A1-A14 for transporting at least one fluid within a fluid transportation system.

[0158] B1. An aircraft (12), the aircraft (12) comprising:

[0159] The double-walled fluid transportation system (10) of any of paragraphs A1-A15, wherein the double-walled fluid transportation system (10) is configured to transport at least one fluid within the aircraft (12).

[0160] C1. A connection ring (180), the connection ring (180) comprising:

[0161] a connection ring body (182) defining an outer radial surface (184) and an inner radial surface (186), wherein the connection ring body (182) comprises a plurality of inboard notches (188) disposed about the inner radial surface (186) and a plurality of outboard notches (192) disposed about the outer radial surface (184), wherein the plurality of inboard notches (188) are offset relative to the plurality of outboard notches (192);

[0162] wherein the connecting ring (180) is configured to be positioned within end regions of the inter-tube passageways (122) of two adjacent double-walled fluid conduits (100) and to support the outer tube (102) and the inner tube (112) of each of the adjacent double-walled fluid conduits (100) spaced apart, the inter-tube passageways (122) extending between the outer tube (102) and the inner tube (112), and wherein the plurality of inner-side notches (188) and the plurality of outer-side notches (192) are configured to provide fluid communication between the inter-tube passageways (122) of the adjacent double-walled fluid conduits (100).

[0163] D1. A method (500), the method (500) comprising:

[0164] additively forming (510) a double-walled fluid conduit (100) including:

[0165] additively forming (515) an outer tube wall (202) surrounding an outer tube inner volume (110) and defining an outer tube first flared end region (132) and an opposite outer tube second flared end region (134); and

[0166] additively forming (520) an inner tube wall (212) within the outer tube inner volume (110) such that the inter-tube passageway (122) completely separates an outer tube inner surface (108) of the outer tube wall (202) from an inner tube outer surface (118) of the inner tube wall (212), wherein the inner tube wall (212) surrounds the central conduit (120) and defines an inner tube first flared end region (136) and an opposite inner tube second flared end region (138), and wherein the inner tube wall (212) and the outer tube wall (202) define an interlocking geometry.

[0167] D2. The method (500) according to paragraph D1, further comprising additively forming (505) a support structure (200) on a build plate (230), wherein the step of additively forming (510) the double-walled fluid conduit (100) includes additively forming the double-walled fluid conduit (100) on the support structure (200).

[0168] D2.1. The method (500) according to paragraph D2, wherein the step of additively forming (510) the double-walled fluid conduit (100) includes interconnecting the inner tube first flared end region (136) and the outer tube first flared end region (132) with a connecting portion (226) of the support structure (200) to interconnect the inner tube first flared end region (136) with the outer tube first flared end region (132).

[0169] D2.1.1. The method (500) of paragraph D2.1, further comprising separating (530) the double-walled fluid conduit (100) from the build plate (230) by separating the connecting portion of the support structure (200) from the base portion of the support structure (200) that is connected to the build plate (230).

[0170] D2.1.2. The method (500) of any of paragraphs D2.1-D2.1.1, further comprising separating (560) the inner tube first flared end region (136) from the outer tube first flared end region (132) by removing the bridging section (232) of the connecting portion (226) of the support structure (200) that interconnects the inner tube base (144) of the inner tube first flared end region (136) and the outer tube base (152) of the outer tube first flared end region (132).

[0171] D2.2. The method (500) of any of paragraphs D2-D2.1.2, wherein the step of additively forming (505) the support structure (200) comprises forming a support body (204) that surrounds an open center region (206), forming a plurality of radial discharge channels (208) within the support body (204) that provide fluid communication between the open center region 206 and an exterior of the support body (204), and forming a plurality of discharge holes (210) that extend through a top surface of the support body (204) to the plurality of radial discharge channels (208).

[0172] D2.2.1. The method (500) of paragraph D2.2, wherein the step of additively forming (510) the double-walled fluid conduit (100) comprises forming an inner tube wall (212) and an outer tube wall (202) on the support structure (200), the center conduit (120) being in fluid communication with the open center region (206) of the support structure (200) and the inter-tube channel (122) being in fluid communication with the plurality of discharge holes (210).

[0173] D3. The method (500) of any of paragraphs D1-D2.2.1, further comprising additively forming (525) a cap (220) that interconnects the outer tube second flared end region (134) and the inner tube second flared end region (138).

[0174] D3.1. The method (500) of paragraph D3, further comprising separating (565) the inner tube second flared end region (138) from the outer tube second flared end region (134) by removing a bridging portion of the cap (200) that interconnects the inner tube second flared end region (138) and the outer tube second flared end region (134).

[0175] D4. The method (500) of any of paragraphs D1-D3.1, wherein the step of additively forming (510) the double-walled fluid conduit (100) includes sintering the manufacturing powder to form one or more of the inner conduit wall (212) and the outer conduit wall (202).

[0176] D4.1. The method (500) of paragraph D4, further comprising removing (535) the manufacturing powder from within the center conduit (120) and the inter-pipe channel (122).

[0177] D5. The method (500) of any of paragraphs D1-D4.1, further comprising installing (555) at least one sealing region along at least one base of the double-walled fluid conduit (100).

[0178] D5.1. The method (500) of paragraph D5, wherein the step of installing (555) at least one sealing region along at least one base of the double-walled fluid conduit (100) includes installing at least one inner conduit sealing region (154) along at least one inner conduit base (144) of the inner conduit wall (212).

[0179] D5.2. The method (500) of any of paragraphs D5-D5.1, wherein the step of installing (555) at least one sealing region along at least one base of the double-walled fluid conduit (100) includes installing at least one outer conduit sealing region (156) along at least one outer conduit base (152) of the outer conduit wall (202).

[0180] D6. The method (500) of any of paragraphs D1-D5.2, further comprising forming (545) a plurality of fastener holes in the double-walled fluid conduit (100).

[0181] D6.1. The method (500) of paragraph D6, wherein the step of forming (545) a plurality of fastener holes includes forming a plurality of inner conduit fastener holes (128) in the double-walled fluid conduit (100).

[0182] D6.1.1. The method (500) of paragraph D6.1, wherein the step of forming a plurality of inner conduit fastener holes (128) includes forming a plurality of first-end inner conduit fastener holes (128) in the double-walled first-flared-end region (140) of the double-walled fluid conduit (100), wherein each first-end inner conduit fastener hole (128) extends from an inner conduit base (144) of the inner conduit first-flared-end region (136) through an outer conduit exterior surface (109) of the outer conduit first-flared-end region (132).

[0183] D6.1.2. The method (500) of paragraph D6.1.1, when dependent on any of paragraphs D2.1-D2.1.2, wherein during forming the plurality of inner tube fastener holes (128), the bridge section (232) of the support structure (200) interconnects the inner tube base (144) of the inner tube first flared end region (136) and the outer tube base (152) of the outer tube first flared end region (132).

[0184] D6.1.3. The method (500) of any of paragraphs D6.1-D6.1.2, wherein the step of forming (545) the plurality of fastener holes includes forming a plurality of second end inner tube fastener holes (128) in the double-walled second flared end region (142) of the double-walled fluid conduit (100), wherein each first end inner tube fastener hole (128) extends from a base of the inner tube second flared end region (138) through an outer surface of the outer tube second flared end region (134).

[0185] D7. The method (500) of any of paragraphs D6-D6.1.3, further comprising installing (550) a plurality of temporary fasteners in at least a subset of the plurality of inner tube fastener holes (128), wherein the plurality of temporary fasteners operatively couple the inner tube wall (212) and the outer tube wall (202) to one another.

[0186] D7.1. The method (500) of paragraph D7, further comprising removing (575) the plurality of temporary fasteners from the double-walled fluid conduit 100.

[0187] D8. The method (500) of any of paragraphs D6-D7, wherein the step of forming (545) the plurality of fastener holes includes forming a plurality of outer tube fastener holes (148) in the double-walled fluid conduit (100).

[0188] D8.1. The method (500) of paragraph D8, wherein the step of forming the plurality of outer tube fastener holes (148) includes forming a plurality of first end outer tube fastener holes (148) in the double-walled first flared end region (140) of the double-walled fluid conduit (100), wherein each first end outer tube fastener hole (148) extends from a base of the outer tube first flared end region (132) through an outer surface of the outer tube first flared end region (132).

[0189] D8.2. The method (500) of any of paragraphs D8-D8.1, wherein the step of forming (545) the plurality of fastener holes includes forming a plurality of second end outer tube fastener holes (148) in the double-walled second flared end region (142) of the double-walled fluid conduit (100).

[0190] D9. The method (500) of any of paragraphs D1-D8.2, further comprising installing (570) the double-walled fluid conduit (100) within a fluid handling system (26) and / or a double-walled fluid transport system 10.

[0191] D9.1. The method (500) of paragraph D9, wherein the double-walled fluid conduit (100) is a first double-walled fluid conduit (100), and wherein the step of installing (570) the double-walled fluid conduit (100) comprises interconnecting the first double-walled fluid conduit (100) with a second double-walled fluid conduit (100).

[0192] D9.1.1 The method (500) of paragraph D9.1, wherein the step of interconnecting the first double-walled fluid conduit (100) with the second double-walled fluid conduit (100) comprises installing a connecting ring (180) within end regions of the inter-pipe passages (122) of the first double-walled fluid conduit (100) and the second double-walled fluid conduit (100).

[0193] D9.1.2. The method (500) of any of paragraphs D9.1-D9.1.1, wherein the step of interconnecting the first double-walled fluid conduit (100) with the second double-walled fluid conduit (100) comprises interconnecting the inner tube base (144) of the first double-walled fluid conduit (100) with the inner tube base (144) of the second double-walled fluid conduit (100), and further comprising interconnecting the outer tube base (152) of the first double-walled fluid conduit (100) with the outer tube base (152) of the second double-walled fluid conduit (100).

[0194] D9.1.3. The method (500) of any of paragraphs D9.1-D9.1.2, wherein the step of interconnecting the first double-walled fluid conduit (100) with the second double-walled fluid conduit (100) comprises operatively coupling the bases of the first double-walled fluid conduit (100) and the second double-walled fluid conduit (100) to opposite faces of a connecting plate (170).

[0195] D9.2. The method (500) of any of paragraphs D9.1-D9.1.3, wherein the installing (570) step further comprises interconnecting the first double-walled fluid conduit (100) with a third double-walled fluid conduit (100).

[0196] D9.3. The method (500) of any of paragraphs D9.1-D9.2, when dependent on any of paragraphs D6.1-D6.1.3, wherein the installing (570) step comprises installing an inter-pipe sealing member (146) within the sealed receiving region (129) of the plurality of inner tube fastener apertures (128).

[0197] D10. The method (500) according to any one of paragraphs D1-D9.3, further comprising shaping (540) the base of the double-walled fluid conduit (100).

[0198] D11. The method (500) according to any one of paragraphs D1-D10, further comprising repeating (580) the method (500) according to any one of paragraphs D1-D8.2 a plurality of times to form a plurality of double-walled fluid conduits (100) and interconnecting the plurality of double-walled fluid conduits (100) to provide fluid communication between the central conduits (120) of the plurality of double-walled fluid conduits (100) and between the inter-conduit passages (122) of the plurality of double-walled fluid conduits (100).

[0199] D12. A double-walled fluid conduit (100) formed by performing the method (500) according to any one of paragraphs D1-D11, as described in any one of paragraphs A1-A15.

[0200] As used herein, the terms “suitable” and “configured” mean that an element, component, or other subject matter is designed and / or intended to perform a given function. Therefore, the use of the terms “suitable” and “configured” should not be construed as meaning that a given element, component, or other subject matter is merely “capable” of performing a given function, but rather that the element, component, and / or other subject matter is specifically selected, created, implemented, utilized, programmed, and / or designed for performing that function. Elements, components, and / or other stated subject matter that are stated as suitable for performing a particular function may also be described as configured to perform that function, which is also within the scope of this disclosure, and vice versa. Similarly, subject matter that is stated as configured to perform a particular function may also be described as operating to perform that function.

[0201] As used herein, the term “and / or” placed between the first entity and the second entity means (1) the first entity, (2) the second entity, and (3) one of the first entity and the second entity. Multiple entries listed under “and / or” should be interpreted in the same way, i.e., “one or more” of the entities so joined together. Optionally, there may be other entities besides those specifically identified by the “and / or” clause, whether related to or unrelated to those specifically identified. Thus, as a non-limiting example, when used in conjunction with open-ended language such as “including,” a reference to “A and / or B” may in one example refer to only A (optionally including entities other than B); in another example refer to only B (optionally including entities other than A); and in yet another example refer to both A and B (optionally including other entities). These entities may refer to elements, action structures, steps, operations, values, etc.

[0202] As used herein, the phrases “for example,” “for instance,” and / or “such as,” when used with respect to one or more component, feature, detail, structure, implementation, and / or method according to the present disclosure, are each intended to convey that the described component, feature, detail, structure, implementation, and / or method is an illustrative, non-exclusive example of the component, feature, detail, structure, implementation, and / or method according to the present disclosure. Thus, the described component, feature, detail, structure, implementation, and / or method is not intended to be limiting, required, or exclusive / exhaustive of those components, features, details, structures, implementations, and / or methods that can be utilized according to the present disclosure. Other components, features, details, structures, implementations, and / or methods, including those that are structurally and / or functionally similar and / or equivalent to the components, features, details, structures, implementations, and / or methods described herein, are within the scope of the present disclosure.

[0203] As used herein, the phrase “at least one of,” with respect to a list of one or more entities, should be understood to mean at least one entity from among those in the list of entities, but not necessarily including at least one of each and every entity specifically listed within the list of entities and not excluding any combinations of entities in the list of entities. This definition also allows that entities can optionally be present other than the entities expressly identified within the list of entities. Thus, as a non-limiting example, “at least one of A and B” (or, equivalently, “at least one of A or B,” or, equivalently “at least one of A and / or B”) can refer, in one implementation, to at least one (optionally including more than one) A, with no B present (optionally including entities other than B); in another implementation, to at least one (optionally including more than one) B, with no A present (optionally including entities other than A); in yet another implementation, to at least one (optionally including more than one) A, and at least one (optionally including more than one) B (optionally including other entities). In other words, the phrases “at least one of,” “one or more of,” and “and / or” are open-ended expressions that are both conjunctive and disjunctive in operation. For example, each of the expressions “at least one of A, B and C,” “at least one of A, B, or C,” “one or more of A, B, and C,” “one or more of A, B, or C” and “A, B, and / or C” can mean A alone, B alone, C alone, A and B together, A and C together, B and C together, A, B and C together, and optionally any

[0204] As used herein, when modifying an extent or a relationship, "at least substantially" can include not only the recited "substantial" extent or relationship, but also the full extent of the recited extent or relationship. A substantial extent of the recited extent or relationship can include at least 75% of the recited extent or relationship. For example, an object formed at least substantially of a material includes an object in which at least 75% of the object is formed of the material, and also includes an object formed entirely of the material. As another example, a first direction that is at least substantially parallel to a second direction includes a first direction that forms an angle of at most 22.5 degrees with respect to the second direction, and also includes a first direction that is entirely parallel to the second direction. As another example, a first length that is substantially equal to a second length includes a first length that is at least 75% of the second length, a first length that is equal to the second length, and a first length that exceeds the second length such that the second length is at least 75% of the first length.

[0205] Not all of the devices and methods according to the present disclosure need to utilize each and every one of the various disclosed device elements and method steps disclosed herein, the present disclosure includes all novel and nonobvious combinations and subcombinations of the various elements and steps disclosed herein. Additionally, one or more of the various elements and steps disclosed herein can define independent inventive subject matter separate from the disclosed overall devices or methods. Thus, such inventive subject matter need not be associated with the particular devices and methods explicitly disclosed herein, but can be used in devices and / or methods other than those explicitly disclosed herein.

Claims

1. A double-walled fluid transport system (10), the system (10) comprising: at least one additively formed double-walled fluid conduit (100), the at least one double-walled fluid conduit (100) comprising: an outer tube (102) comprising a pair of outer tube flared end regions (104) and an outer tube central region (106) extending between the pair of outer tube flared end regions (104), wherein the outer tube central region (106) and the pair of outer tube flared end regions (104) define an outer tube inner surface (108) that surrounds an outer tube inner volume (110); and an inner tube (112) defining a central conduit (120) and extending within the outer tube inner volume (110), wherein the inner tube (112) comprises a pair of inner tube flared end regions (114) and an inner tube central region (116) extending between the pair of inner tube flared end regions (114), and wherein the inner tube central region (116) and the pair of inner tube flared end regions (114) define an inner tube outer surface (118); and wherein the inner tube (112) and the outer tube (102) define an interlocking geometry, and wherein the inner tube (112) and the outer tube (102) are sized and shaped to be supported such that an inter-tube passage (122) completely separates the inner tube outer surface (118) from the outer tube inner surface (108), i.e., the outer tube inner surface (108) and the inner tube outer surface (118) are non-contacting, the inter-tube passage (122) extending between the outer tube inner surface (108) and the inner tube outer surface (118), wherein the outer tube (102) is unitary, and wherein the inner tube (112) is a separate unitary body.

2. The system (10) according to claim 1, wherein the double-walled fluid conduit (100) comprises a double-walled central region (158) defined by the inner tube central region (116) and the outer tube central region (106), and wherein the double-walled central region (158) comprises a curved configuration (160).

3. The system (10) of claim 1, wherein, each of the pair of inner tube flared end regions (114) defines an inner tube outermost lateral dimension (124), wherein along the outer tube central region (106), the outer tube inner surface (108) defines an outer tube passage outermost lateral dimension (126), and wherein the inner tube outermost lateral dimension (124) is greater than the outer tube passage outermost lateral dimension (126).

4. The system (10) of claim 1, wherein, the at least one double-walled fluid conduit (100) comprises a plurality of inner tube fastener apertures (128) disposed about at least one of a double-walled first flared end region (140) and a double-walled second flared end region (142), and wherein the plurality of inner tube fastener apertures (128) are configured to cooperate with a plurality of inner tube fasteners (130) to operatively couple the inner tube (112) to an adjacent structure.

5. The system (10) of claim 1, further comprising a plurality of outer tube fastener holes (148) positioned along at least one of a double-walled first flared end region (140) of the double-walled fluid conduit (100) and a double-walled second flared end region (142) of the double-walled fluid conduit (100) and configured to cooperate with a plurality of outer tube fasteners (150) to operatively couple the outer tube (102) to an adjacent structure.

6. The system (10) of claim 1, wherein, The double-walled fluid transport system (10) comprises a plurality of double-walled fluid conduits (100), and wherein the double-walled fluid transport system (10) further comprises a connection plate (170) configured to interconnect adjacent double-walled fluid conduits (100) of the plurality of double-walled fluid conduits (100) to one another, and wherein the connection plate (170) is configured to support the inner tube (112) and the outer tube (102) of the adjacent double-walled fluid conduits (100) such that the inter-tube passage (122) completely separates the inner tube outer surface (118) from the outer tube inner surface (108) at least in the vicinity of the connection plate (170).

7. The system (10) of claim 1, wherein, The double-walled fluid transport system (10) further comprises a connection ring (180) configured to be positioned between an inner tube base (144) of the inner tube (112) and an outer tube base (152) of the outer tube (102) and to support the inner tube (112) and the outer tube (102) such that the inter-tube passage (122) completely separates the inner tube outer surface (118) from the outer tube inner surface (108) at least in the vicinity of the connection ring (180).

8. The system (10) of claim 1, wherein, The inter-tube passage (122) is configured to isolate mechanical faults from propagating between the inner tube (112) and the outer tube (102).

9. A method (500) for forming a double-walled fluid conduit (100), the method (500) comprising the steps of: forming the double-walled fluid conduit (100) in an additive manner, including: forming an outer tube wall (202) in an additive manner, the outer tube wall (202) surrounding an outer tube inner volume (110) and defining an outer tube first flared end region (132) and an opposite outer tube second flared end region (134); and forming an inner tube wall (212) in an additive manner within the outer tube inner volume (110) such that an inter-tube passage (122) completely separates an inner tube outer surface (118) of the inner tube wall (212) from an outer tube inner surface (108) of the outer tube wall (202), wherein the inner tube wall (212) surrounds a central conduit (120) and defines an inner tube first flared end region (136) and an opposite inner tube second flared end region (138), and wherein the inner tube wall (212) and the outer tube wall (202) define an interlocking geometry, and wherein forming the double-walled fluid conduit (100) in an additive manner includes forming the double-walled fluid conduit (100) as a unitary body.

10. The method (500) of claim 9, the method (500) further comprising forming the support structure (200) in an additive manner on a build plate (230), wherein, The step of forming the double-walled fluid conduit (100) in an additive manner includes forming the double-walled fluid conduit (100) in an additive manner on the support structure (200).

11. The method (500) of claim 10, wherein The step of forming the double-walled fluid conduit (100) in an additive manner includes interconnecting the inner tube first flared end region (136) and the outer tube first flared end region (132) with a connecting portion of the support structure (200) to interconnect the inner tube first flared end region (136) with the outer tube first flared end region (132).

12. The method (500) of claim 11, further comprising separating the double-walled fluid conduit (100) from the build plate (230) by separating the connecting portion of the support structure (200) from a base portion of the support structure (200) connected to the build plate (230).

13. The method (500) of claim 11, further comprising separating the inner tube first flared end region (136) from the outer tube first flared end region (132) by removing a bridging section (232) of the connecting portion of the support structure (200) that interconnects an inner tube base (144) of the inner tube first flared end region (136) and an outer tube base (152) of the outer tube first flared end region (132).

14. The method (500) of claim 12, further comprising forming a cap (220) in an additive manner that interconnects the outer tube second flared end region (134) and the inner tube second flared end region (138).

15. The method (500) of claim 14, further comprising separating the inner tube second flared end region (138) from the outer tube second flared end region (134) by removing a bridging portion of the cap (220) that interconnects the inner tube second flared end region (138) and the outer tube second flared end region (134).

Images