Cryogenic Piping Support Structure

Abstract

To provide a cryogenic pipe supporting structure that can restrain low-temperature embrittlement of a supporting structure for a pipe through which cryogenic fluid is passed.SOLUTION: A cryogenic pipe supporting structure TS1 comprises: a pipe 1 through which cryogenic fluid is passed; a supporting member 2 supporting the pipe 1 on a base 10; and a tray 6 thermally insulated from the pipe 1, and for receiving liquid dripping from an outer peripheral surface of the pipe 1. The supporting member 2 includes: an upper supporting tool 3 welded to the pipe 1; a lower supporting tool 4 capable of relatively moving with respect to the base 10; and a thermal insulation part 5 arranged between the upper supporting tool 3 and the lower supporting tool 4, and formed of a thermal insulation material. The tray 6 comprises a held part 64 held by the thermal insulation part 5.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a support structure for piping through which a cryogenic fluid flows. [Background technology]

[0002] For example, a heat-insulating pipe having a vacuum double pipe structure is known as a pipe for circulating a cryogenic liquefied gas such as liquefied hydrogen (Patent Document 1). In a storage facility for a cryogenic liquefied gas, in addition to the heat-insulating pipe, an intermittent cryogenic pipe through which a cryogenic gas is temporarily circulated is sometimes installed, for example, as a pipe for discharging boil-off gas. The intermittent cryogenic pipe generally does not have a heat insulating layer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-20914 Summary of the Invention [Problem to be solved by the invention]

[0004] When a cryogenic fluid flows through a pipe, particularly a pipe without a thermal barrier such as the intermittent cryogenic pipe, the gas surrounding the pipe may liquefy, and if the liquefied gas drips onto the support structure of the pipe, the support structure may become brittle at low temperatures.

[0005] An object of the present disclosure is to provide a cryogenic piping support structure that can suppress low-temperature embrittlement of a support structure for piping through which a cryogenic fluid flows. [Means for solving the problem]

[0006] A cryogenic piping support structure according to one aspect of the present disclosure includes a pipe for circulating a cryogenic fluid, a support member for supporting the pipe on a base, and a tray that is insulated from the pipe and receives liquid dripping from the outer surface of the pipe. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a cryogenic piping support structure that can suppress low-temperature embrittlement of a support structure for piping through which a cryogenic fluid flows. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view showing a cryogenic piping support structure according to a first embodiment of the present disclosure, taken along line II in FIG. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 3 is a cross-sectional view showing the cryogenic piping support structure according to the second embodiment, taken along line III-III in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 5 is a cross-sectional view showing a cryogenic piping support structure according to a comparative example. [Figure 6] FIG. 6 is a cross-sectional view showing a cryogenic piping support structure according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] [First embodiment] Hereinafter, an embodiment of a cryogenic piping support structure according to the present disclosure will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a cryogenic piping support structure TS1 according to a first embodiment of the present disclosure, and FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. FIG. 1 is also a cross-sectional view taken along line II in FIG. 2. The cryogenic piping support structure TS1 is a support structure for piping 1 on a base 10, and includes piping 1 for circulating a cryogenic fluid, a support member 2, and a tray 6. FIG. 1, FIG. 2, and other figures are labeled with XYZ directions. In this specification, the X direction may be referred to as the axial direction of the piping 1, the Y direction as the left-right direction, and the Z direction as the up-down direction.

[0010] Pipe 1 is a single metal pipe through which a cryogenic liquefied gas or cryogenic gas such as liquefied hydrogen flows. Pipe 1 may be an intermittent cryogenic pipe through which a cryogenic gas flows temporarily. Intermittent cryogenic pipe is a pipe used, for example, to discharge cryogenic gas blown out from a safety valve equipped in a storage facility for cryogenic liquefied gas, or boil-off gas generated when introducing liquefied gas into the storage facility. Pipe 1 is not particularly limited as long as it is a pipe through which a cryogenic fluid can flow, and may be, for example, a vacuum double pipe.

[0011] The pipe 1 of this embodiment is a pipe that does not have a heat insulating layer. Therefore, if, for example, cryogenic hydrogen gas flows through the pipe 1 for a long period of time, the surface temperature of the pipe 1 may drop to -200°C or lower. Such a cryogenic temperature is below the boiling points of nitrogen and oxygen, which are the main components of air, and this causes the air around the pipe 1 to condense and produce liquefied air. In other words, liquefied air is produced on the surface of the pipe 1, leading to a situation where the liquefied air drips from the pipe 1.

[0012] The base 10 is a support base for the piping 1, and examples thereof include the ground, a ground structure, a structure or deck on a ship, or a columnar structure assembled on these. Figures 1 and 2 show an example of the base 10 made of a columnar structure extending horizontally. The columnar structure may be a pipe rack or a frame rack made of a high-strength metal such as carbon steel. The top surface 10A of the base 10 is a horizontal surface, on which a support member 2 for supporting the piping 1 is placed.

[0013] Support member 2 is a member that supports pipe 1 on base 10, and includes upper support 3, lower support 4, and heat insulating section 5. Upper support 3 is a member that is located directly below pipe 1 and directly supports pipe 1. Lower support 4 is a member that is slidably arranged on top surface 10A of base 10. Heat insulating section 5 is a member that is interposed between upper support 3 and lower support 4 and that thermally insulates these supports 3, 4.

[0014] The upper support 3 is formed of a low-temperature-resistant material, such as stainless steel, that does not become embrittled even in the extremely low temperature range corresponding to the temperature range of the fluid flowing through the pipe 1. The upper support 31 includes an upper-end support portion 31, an upper U-shaped bracket 32, and a fastening member 33. The upper-end support portion 31 is formed of a single rib-shaped member extending in the axial direction of the pipe 1. In FIGS. 1 and 2, the upper-end support portion 31 is illustrated as a rectangular flat plate elongated in the X direction when viewed in the Y direction, with a thickness in the Y direction of approximately 1 / 10 of the pipe diameter. The upper-end support portion 31 is fixed to the pipe 1. Specifically, an upper end portion 311, which is the upper edge of the upper-end support portion 31 made of the rib-shaped member, is welded to the lowest end of the pipe 1. By forming the upper-end support portion 31, which directly supports the pipe 1, from a single rib-shaped member, the cold heat transfer path from the pipe 1 to the base 10 can be limited to a single path with a narrow cross-sectional area.

[0015] The upper U-shaped bracket 32 ​​is a member that constitutes the lower end of the upper support 3 and is fixed to the thermal insulation section 5. As shown in FIG. 1 , the upper U-shaped bracket 32 ​​is a U-shaped bracket that opens downward in a cross section in the Y direction. The size of the upper U-shaped bracket 32 ​​in the X direction is the same as that of the upper end support section 31. The upper end surface of the upper U-shaped bracket 32 ​​is welded to the lower edge of the upper end support section 31, thereby integrating the upper U-shaped bracket 32 ​​with the upper end support section 31. The fastening member 33 consists of a bolt and a nut. The bolt penetrates the upper U-shaped bracket 32, which sandwiches the thermal insulation section 5, in the Y direction, and the nut is screwed into the through end of the bolt. In this embodiment, three fastening members 33 are arranged at equal intervals in the pipe axial direction and fastened to the upper U-shaped bracket 32.

[0016] Lower support 4 is made of stainless steel, carbon steel, or the like, and includes a lower end support part 41, a lower U-shaped bracket 42, and a fastening member 43. Lower end support part 41 is a flat plate arranged horizontally, and constitutes the lowermost part of support member 2. Lower end support part 41 is slidable relative to upper surface 10A of base 10. As a result, even if the supported pipe 1 thermally expands or contracts, the sliding of lower end support part 41 allows relative displacement between pipe 1 and base 10, thereby mitigating the effect of thermal stress on pipe 1.

[0017] The lower U-shaped bracket 42 is a U-shaped bracket that opens upward in a cross section in the Y direction. The size of the lower U-shaped bracket 42 in the X direction is the same as that of the lower end support portion 41. The lower end surface of the lower U-shaped bracket 42 is welded to the upper surface of the flat lower end support portion 41, thereby integrating the lower U-shaped bracket 42 with the lower end support portion 41. The fastening member 43 consists of a bolt and a nut. The bolt penetrates the lower U-shaped bracket 42, which sandwiches the insulation portion 5, in the Y direction, and the nut is screwed onto the through end of the bolt. Three fastening members 43 are arranged at equal intervals in the pipe axial direction and fastened to the lower U-shaped bracket 42, at the same positions in the X direction as the three fastening members 33.

[0018] The heat insulating section 5 is a rectangular flat plate elongated in the X direction when viewed in the Y direction, and is an insulating material having a thickness in the Y direction approximately twice that of the upper end support section 31. The thickness of the heat insulating section 5 is preferably selected so that its section modulus matches that of the high-strength upper end support section 31. The size of the heat insulating section 5 in the X direction is the same as that of the upper support member 3 and the lower support member 4. Of course, the size of the heat insulating section 5 in the X direction may be set shorter or longer than that of the upper support member 3 and the lower support member 4. The heat insulating section 5 is a member that provides thermal insulation between the piping 1 and the base 10 and the tray 6, and also serves as part of the support member 2 that supports the piping 1. Therefore, it is desirable for the heat insulating section 5 to be a member having excellent rigidity. From this perspective, it is desirable to use a member formed of GFRP (glass fiber reinforced plastic), CFRP (carbon fiber reinforced plastic), rigid urethane resin, or the like as the heat insulating section 5.

[0019] The heat insulating section 5 includes an upper connecting section 51 facing the pipe 1 and a lower connecting section 52 facing the base 10. The upper connecting section 51 and the lower connecting section 52 are each provided with through holes through which the bolts of the fastening members 33, 43 pass. The upper connecting section 51 is sandwiched between the upper U-shaped bracket 32 ​​and fastened with the fastening members 33, thereby being connected and integrated with the upper support device 3. The lower connecting section 52 is sandwiched between the lower U-shaped bracket 42 and fastened with the fastening members 43, thereby being connected and integrated with the lower support device 4. As described above, the support member 2 of this embodiment has a structure in which the upper end support section 31, which is fixed to the pipe 1, and the lower end support section 41, which slides relative to the base 10, are connected by the heat insulating section 5 having a flat rib shape.

[0020] The tray 6 is made of a folded metal plate, is insulated from the pipe 1, and is a member that receives liquid dripping from the outer circumferential surface of the pipe 1. In the first embodiment, an example is shown in which the trays 6 are arranged on the left and right sides of the heat insulating unit 5. The tray 6 includes a liquid receiving surface 61, a side plate 62, an inclined plate 63, and a holding unit 64. The pair of left and right trays 6 have symmetrical shapes with the heat insulating unit 5 in between.

[0021] The liquid receiving surface 61 is composed of a flat plate extending horizontally in the XY direction, and receives liquid dripping from the outer surface of the pipe 1. As shown in FIG. 2, the size of the liquid receiving surface 61 in the X direction is wider than the width of the base 10, which is a columnar structure, i.e., the width of the base 10 in the X direction. Furthermore, the size of the liquid receiving surface 61 in the Y direction is wider than the lower end support portion 41 of the lower support 4. Therefore, the arrangement of the tray 6 can prevent the cryogenic liquid, such as liquefied air, from pouring from the pipe 1 onto the base 10 and the lower support 4.

[0022] The side plate 62 is a portion bent upward from the Y-direction edge of the liquid receiving surface 61. The side plate 62 prevents the liquid received on the liquid receiving surface 61 from dripping from the Y-direction edge. The side plate 62 and the heat insulating section 5 form a gutter shape. The inclined plate 63 is a portion bent diagonally downward from the X-direction edge of the liquid receiving surface 61. The liquid received on the liquid receiving surface 61 drips down along the inclined plate 63. As described above, the liquid receiving surface 61 is wider than the width of the base 10, so the lower end support portion 41, which moves relative to the base 10, is not located directly below the inclined plate 63. For this reason, the liquid dripping from the inclined plate 63 does not generally fall onto the position where the lower end support portion 41 is located.

[0023] The holding portion 64 is a portion held by the heat insulating portion 5. The holding portion 64 is a portion bent downward from the Y-direction edge of the liquid receiving surface 61 opposite the side plate 62. The holding portion 64 is attached to the vertical side surface of the heat insulating portion 5 and fixed to the heat insulating portion 5 with fixing screws 65. The form of the holding portion 64 is not limited as long as it can hold the tray 6 to the heat insulating portion 5. For example, the holding portion 64 may be fitted into an engaging portion provided on the heat insulating portion 5, fastened with a wire or a strip-shaped binder, or fixed with an adhesive. It is desirable to interpose a sealant between the heat insulating portion 5 and the holding portion 64 to prevent leakage of the received liquid. In this case, the sealant may also serve as an adhesive. For example, an epoxy-based adhesive may be interposed between the heat insulating portion 5 and the holding portion 64 as a member that serves as both a sealant and an adhesive.

[0024] The cryogenic pipe support structure TS1 according to the first embodiment described above includes the tray 6 that receives liquid dripping from the outer peripheral surface of the pipe 1 through which the cryogenic fluid flows, thereby preventing low-temperature embrittlement of the base 10, which would otherwise be caused by direct contact between the cryogenic liquid dripping from the pipe 1 and the base 10 serving as a support structure. Furthermore, the tray 6 is insulated from the pipe 1 by being held by the insulating section 5. Therefore, even if the pipe 1 is cooled by the flow of cryogenic gas, for example, the transfer of cold energy from the pipe 1 to the tray 6 is restricted. Additionally, heat input from the atmosphere to the insulated tray 6 can be expected. In other words, the tray 6 is given heat through heat exchange with the atmosphere, which advantageously promotes evaporation of liquid dripped onto the tray 6.

[0025] If the tray 6 were thermally connected to the upper support 3 that directly supports the pipe 1, the cold heat of the pipe 1 would be transferred to the tray 6, causing the tray 6 to become extremely cold. In this case, the air around the tray 6 would be liquefied, and the dripping of this liquefied air could cause the base 10 and the support member 2 to become brittle at low temperatures. However, according to this embodiment, the tray 6 and the pipe 1 are thermally insulated, so the above-mentioned problem can be suppressed.

[0026] In the first embodiment, an upper end support portion 31 made of a rib-shaped member is interposed between the heat insulating portion 5 and the pipe 1. Generally, the amount of heat transfer increases in proportion to the cross-sectional area and decreases in inverse proportion to the heat transfer distance. By employing the rib-shaped upper end support portion 31, the cross-sectional area of ​​the heat transfer path from the pipe 1 to the heat insulating portion 5 can be reduced. This increases the thermal resistance and improves the heat insulating performance for the tray 6. Furthermore, since the heat insulating portion 5 is also made of a rib-shaped member, the cross-sectional area of ​​the heat transfer path to the base 10 can also be reduced. Furthermore, since the support member 2 has a structure in which the rib-shaped upper end support portion 31 and the heat insulating portion 5 are connected, it is easy to ensure the heat transfer distance between the pipe 1 and the base 10.

[0027] The lower end support part 41 is insulated from the upper end support part 31 by the heat insulating part 5, so it does not become extremely cold. Furthermore, the liquid dripping from the pipe 1 is received by the tray 6, so the cryogenic liquid does not rain down on the lower end support part 41. This prevents frost or ice from forming on the sliding part of the lower end support part 41 relative to the upper surface 10A of the base 10. Therefore, the sliding of the lower end support part 41 does not impede its role of releasing thermal stress in the pipe 1.

[0028] [Second embodiment] Fig. 3 is a cross-sectional view showing a cryogenic piping support structure TS2 according to a second embodiment, and Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 3. Fig. 3 is also a cross-sectional view taken along line III-III in Fig. 4. The cryogenic piping support structure TS2 is a structure that supports piping with a relatively large diameter on a base 10, and includes piping 1A through which a cryogenic fluid flows, a support member 2A, and a tray 6A.

[0029] The piping 1A is made of a single metal pipe and is a pipe for circulating a cryogenic fluid or a cryogenic gas, for example, an intermittent cryogenic pipe. The base 10 is a support base for the piping 1A and has an upper surface 10A on which a support member 2A is placed.

[0030] The support member 2A is a member that supports the pipe 1 on the base 10, and includes an upper support 3A, a lower support 4A, and a pair of heat insulating members 5A that are spaced apart in the X direction. The materials and the like of these members are the same as those of the first embodiment. The upper support 3A is located directly below the pipe 1A and directly supports the pipe 1A. The lower support 4A is slidably disposed on the upper surface 10A of the base 10. The heat insulating member 5A is interposed between the upper support 3A and the lower support 4A, and thermally insulates these supports 3A and 4A.

[0031] The upper support 3A includes a pair of upper end support portions 31A (rib-shaped members), upper U-shaped brackets 32A, and fastening members 33A, which are arranged at a predetermined interval in the X direction, which is the pipe axis direction. The upper end support portions 31A are made of rib-shaped members extending in the Y direction, which is perpendicular to the pipe axis, and are arranged in pairs corresponding to a pair of heat insulating portions 5A. The upper end support portions 31A have upper end portions 311A ​​consisting of a concave, arc-shaped support surface that follows the arc-shaped lower end region of the pipe 1A. The upper end portions 311A ​​are welded to the lower end region of the pipe 1A.

[0032] The upper U-shaped bracket 32A is a member that constitutes the lower end of the upper support 3A that is fixed to the heat insulating section 5A. The upper U-shaped bracket 32A is a U-shaped bracket that opens downward in cross section in the X direction, and is welded to the lower ends of the pair of upper end support sections 31A. The fastening member 33A consists of a bolt and a nut. The bolt passes through the upper U-shaped bracket 32A in the X direction, which sandwiches the heat insulating section 5A, and the nut is screwed onto the passing end of the bolt.

[0033] The pair of upper end support portions 31A are connected by an upper connecting plate 34. The upper connecting plate 34 is a flat member extending in the X direction, and one end thereof is welded to one of the upper end support portions 31A and the other end thereof is welded to the other upper end support portion 31A. By integrating the pair of upper end support portions 31A with the upper connecting plate 34, the rigidity of the upper support device 3A can be increased. The upper edge of the upper connecting plate 34 may be welded to the lower end of the pipe 1A, or this welding may be omitted.

[0034] The lower support 4A includes a lower end support portion 41A, a lower U-shaped bracket 42A, and a fastening member 43A. The lower end support portion 41A is a flat plate arranged horizontally and constitutes the lowermost portion of the support member 2A. The lower end support portion 41A is slidable relative to the upper surface 10A of the base 10, and alleviates the effect of thermal stress on the piping 1A.

[0035] The lower U-shaped bracket 42A is a U-shaped bracket that opens upward in cross section in the X direction. The lower U-shaped brackets 42A are arranged in pairs spaced apart in the X direction to correspond to the pair of heat insulating sections 5, and are welded to the upper surface of the lower end support section 41A. The fastening member 43A consists of a bolt and a nut. The bolt penetrates the lower U-shaped bracket 42A, which sandwiches the heat insulating section 5A, in the X direction, and the nut is screwed onto the through end of the bolt. The pair of lower U-shaped brackets 42A are interconnected by a lower connecting plate 44. The lower connecting plate 44 is a rib-shaped member extending in the X direction, and one end of the lower U-shaped bracket 42A is welded to one of the lower U-shaped brackets 42A, and the other end is welded to the other lower U-shaped bracket 42A.

[0036] The pair of heat insulating members 5A are heat insulating materials made of rectangular flat plates extending in the Y direction. While Fig. 3 illustrates heat insulating members 5A having the same size in the Y direction as upper end support member 31, upper U-shaped metal fitting 32, and lower U-shaped metal fitting 42A, the Y direction size may be different from these. The thickness in the X direction of heat insulating members 5A is selected to be similar in size to the section modulus of upper end support member 31A.

[0037] The heat insulating section 5A has an upper connecting section 51A facing the pipe 1A and a lower connecting section 52A facing the base 10. The upper connecting section 51A and the lower connecting section 52A have through holes drilled therein to allow the bolts of the fastening members 33A and 43A to pass therethrough, respectively. The upper connecting section 51A is sandwiched between upper U-shaped metal fittings 32A and fastened with the fastening members 33A, thereby being connected and integrated with the upper support member 3A. The lower connecting section 52A is sandwiched between lower U-shaped metal fittings 42A and fastened with the fastening members 43A, thereby being connected and integrated with the lower support member 4A.

[0038] The tray 6A is made of a folded metal plate, is insulated from the pipe 1A, and is a member that receives liquid dripping from the outer surface of the pipe 1A. In the second embodiment, an example is shown in which a single tray 6A is installed so as to be fitted into a pair of heat insulating parts 5A. The tray 6A includes a liquid receiving surface 61A, a side plate 62A, an inclined plate 63A, a holding part 64A, and an opening 66.

[0039] The liquid receiving surface 61A is formed of a flat plate extending horizontally and receives liquid dripping from the outer surface of the pipe 1A. As shown in FIG. 4, the X-direction size of the liquid receiving surface 61A is wider than the X-direction width of the base 10. Furthermore, the Y-direction size of the liquid receiving surface 61A is wider than the lower-end support portion 41A of the lower support 4A. This prevents the cryogenic liquid dripping from the pipe 1A from pouring onto the base 10 and the lower support 4A.

[0040] The side plates 62A are portions bent upward from both edges of the liquid receiving surface 61A in the Y direction. The pair of side plates 62 form a gutter shape with the liquid receiving surface 61A as the bottom plate. The inclined plate 63A is a portion bent diagonally downward from the edge of the liquid receiving surface 61A in the X direction.

[0041] The holding portion 64A is a portion that is held by the heat insulating portion 5A. The holding portion 64A is provided in two locations to correspond to the pair of heat insulating portions 5A. The holding portion 64A is formed by cutting a slit in part of the liquid receiving surface 61A and bending it downward. The opening 66 is an opening formed by bending the holding portion 64A, and the heat insulating portion 5A is inserted through it. The holding portion 64A is attached to the side of the heat insulating portion 5A that passes through the opening 66, and is fixed to the heat insulating portion 5A by a fixing screw 65A.

[0042] The cryogenic piping support structure TS2 according to the second embodiment includes a tray 6A insulated from the piping 1A, which, like the first embodiment, prevents the base 10 from becoming brittle at low temperatures and the tray 6 from becoming extremely cold. In addition, the upper support 3A has a structure in which upper end support portions 31A made up of a pair of rib-shaped members are connected by an upper connecting plate 34, so the piping 1A can be supported over a relatively wide support area while reducing the heat transfer and insulation area. Therefore, a stable support structure can be achieved even for piping 1A with a large diameter.

[0043] [Comparative Example] Here, a comparative example to the cryogenic piping support structures TS1 and TS2 will be described. FIG. 5 is a cross-sectional view showing a cryogenic piping support structure TS0 according to the comparative example. The support member 20 for the piping 1 in the cryogenic piping support structure TS0 includes an upper end support portion 21, a flat plate 22, a lower end support portion 23, and an insulating portion 24. The upper end edge of the upper end support portion 21 is welded to the piping 1, and the flat plate 22 is welded to the lower end edge of the upper end support portion 21. The lower end support portion 23 is a flat plate that can slide on the upper surface 10A of the base 10. The insulating portion 24 is interposed between the flat plate 22 and the lower end support portion 23. The tray 600 has a liquid receiving surface 601 and a side plate 602, and is held by the upper end support portion 21, which is directly connected to the piping 1.

[0044] Furthermore, because the tray 600 is held by the upper end support portion 21 that is directly connected to the pipe 1, the cold heat of the pipe 1 is transferred to the tray 600. In this case, the tray 600 may liquefy the air around it, and the dripping of the liquefied air may cause the base 10 and the support member 20 to become brittle at low temperatures. Furthermore, frost formation on the lower end support portion 23 may hinder the sliding movement of the upper surface 10A of the base 10. The above-described problems of the comparative example can be solved by the cryogenic pipe support structures TS1 and TS2 described above.

[0045] [Modified embodiment] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments. For example, the manner in which the trays 6, 6A are insulated from the pipes 1, 1A can be modified in various ways. In the above-described embodiment, the trays 6, 6A are held using the insulating parts 5, 5A that insulate the pipes 1, 1A from the base 10. Alternatively, the trays may be insulated using a dedicated insulating material. As an example, FIG. 6 illustrates a cryogenic pipe support structure TS3 according to a modified embodiment.

[0046] The support member 2B for the pipe 1 in the cryogenic pipe support structure TS3 includes an upper support 3B, a lower support 4B, and a heat insulating portion 5C. The upper support 3B has an upper end support portion 31B whose upper edge is welded to the pipe 1, and a lower end portion 32B made of a flat plate welded to the lower edge of the upper end support portion 31B. The lower support 4B is a flat plate that can slide on the upper surface 10A of the base 10. The heat insulating portion 5C is interposed between the lower end portion 32B and the lower support 4B. The heat insulating portion 5C insulates the pipe 1 from the base 10.

[0047] The trays 6B are arranged in pairs on both sides of the upper end support part 31B and receive liquid dripping from the pipe 1. The trays 6B are held via heat insulating parts 5B attached to both sides of the upper end support part 31B. Even in this holding mode, the cold heat of the pipe 1 can be insulated by the heat insulating parts 5B, and the trays 6B can be prevented from becoming extremely cold.

[0048] Summary of this disclosure The specific embodiments described above include disclosures having the following configurations.

[0049] A cryogenic piping support structure according to one aspect of the present disclosure includes a pipe for circulating a cryogenic fluid, a support member for supporting the pipe on a base, and a tray that is insulated from the pipe and receives liquid dripping from the outer surface of the pipe.

[0050] This cryogenic piping support structure includes a tray that receives liquid dripping from the outer periphery of the piping through which the cryogenic fluid flows, thereby preventing the base from becoming brittle at low temperatures due to direct contact between the cryogenic liquid dripping from the piping and the base. The tray is also insulated from the piping. This limits the heat transfer of cold from the piping to the tray. Additionally, the insulation allows for atmospheric heat to be transferred to the tray. This prevents the tray itself from becoming cryogenic. If the tray becomes cryogenic due to the cold, the surrounding gas will liquefy, and the dripping of the liquid can embrittle the base and the support member. However, the insulation between the tray and the piping prevents the above-mentioned problems.

[0051] In the above-described cryogenic piping support structure, it is preferable that the support member includes a heat insulating portion formed of a heat insulating material, and the tray has a holding portion that is held by the heat insulating portion.

[0052] According to this support structure, the heat insulating portion is incorporated into a part of the support portion, and the tray is held by the heat insulating portion, so that the support structure can be simplified.

[0053] In the above-mentioned cryogenic piping support structure, the support member can be configured to include an upper end support portion consisting of a rib-shaped member fixed to the piping, a lower end support portion that is slidable relative to the base, and the insulating portion between the upper end support portion and the lower end support portion.

[0054] According to this support structure, an upper end support portion made of a rib-shaped member is interposed between the insulation portion and the piping. This reduces the cross-sectional area of ​​the heat transfer path from the piping to the insulation portion, thereby increasing thermal resistance and improving the thermal insulation performance of the tray. Furthermore, because the lower end support portion is insulated from the upper end support portion by the insulation portion, it does not become extremely cold, and liquid dripping from the piping is received by the tray. Therefore, frosting or freezing of the sliding portion of the lower end support portion relative to the base is suppressed, and the sliding function of the lower end support portion to relieve thermal stress in the piping is not impaired.

[0055] In the above configuration, if the upper end support portion has an upper end portion welded to the lower end of the piping and a lower end portion fixed to the insulation portion, and is structured as a single rib-shaped member extending in the axial direction of the piping, it becomes easier to regulate heat transfer from the piping to the insulation portion.

[0056] In the above-described cryogenic piping support structure, the upper end support portion may have an upper end portion welded to the lower end of the piping and a lower end portion fixed to the insulating portion, and may be structured to include a pair of rib-shaped members arranged perpendicular to the piping axis, and a connecting member connecting the pair of rib-shaped members.

[0057] According to this support structure, the upper end support portion includes a pair of rib-shaped members connected by a connecting member, so that the pipe can be supported over a relatively large support area while suppressing the heat insulating area, thereby realizing a stable support structure even when the pipe is large.

[0058] In the above-described cryogenic piping support structure, it is preferable that the base is made of a columnar structure extending horizontally, and the tray has a width larger than the width of the columnar structure.

[0059] With this support structure, even if a drainage section for draining liquid is provided on the widthwise edge of the tray, the structure makes it difficult for the liquid discharged from the drainage section to drip onto the columnar structure, thereby suppressing low-temperature embrittlement of the columnar structure. [Explanation of symbols]

[0060] TS1, TS2, Ts3 cryogenic piping support structure 1, 1A piping 10 Foundations 2, 2A, 2B Support members 3, 3A, 3B Upper support 31, 31A Upper end support portion (rib-shaped member) 311, 311A ​​upper end 32, 32A Upper U-shaped bracket (lower end) 34 Upper connecting plate 4, 4A, 4B Lower support 5, 5A, 5B Insulation section Trays 6, 6A, and 6B 64, 64A holding part

Claims

1. A pipe for circulating a cryogenic fluid; a support member that supports the piping on a base; a tray insulated from the piping and configured to receive liquid dripping from an outer peripheral surface of the piping, the support member includes a heat insulating portion formed of a heat insulating material, The tray has a holding portion that is held by the insulating portion.

2. In the cryogenic piping support structure according to claim 1, The support member is an upper end support portion formed of a rib-shaped member fixed to the piping; a lower end support portion slidable relative to the base; The heat insulating portion between the upper end support portion and the lower end support portion; A cryogenic piping support structure comprising:

3. In the cryogenic piping support structure according to claim 2, The upper end support portion has an upper end portion welded to the lower end of the piping and a lower end portion fixed to the heat insulating portion, and is made of a single rib-shaped member extending in the axial direction of the piping.

4. In the cryogenic piping support structure according to claim 2, The upper end support portion is a pair of rib-shaped members each having an upper end welded to the lower end of the pipe and a lower end fixed to the heat insulating portion, the pair of rib-shaped members being arranged perpendicular to the pipe axis; a connecting member that connects the pair of rib-shaped members.

5. In the cryogenic piping support structure according to any one of claims 1 to 4, The base is a columnar structure extending horizontally, The tray has a width greater than the width of the columnar structure.

Images