Liquefied gas supply apparatus for a ship and a ship

Abstract

A liquefied gas supply apparatus includes a tank configured to be disposed on an open deck of a ship body and capable of storing a liquefied gas, and a tank-equipped fitting configured to be disposed on the tank and having a portion with a device for supplying the liquefied gas stored in the tank to a consumption end, the tank-equipped fitting including a liquefied gas flow passage portion in communication with the tank and allowing the liquefied gas to flow, a gas flow passage portion allowing a gasified gas obtained by gasifying the liquefied gas to flow, and a protective cover formed in a box shape, accommodating the liquefied gas flow passage portion inside, and allowing the gas flow passage portion to be exposed.

Description

Technical Field

[0001] This invention relates to a liquefied gas supply device for ships and a ship.

[0002] This application claims priority based on Japanese Patent Application No. 2024-057732, filed on March 29, 2024, the contents of which are incorporated herein by reference. Background Technology

[0003] Patent document 1 discloses a structure that efficiently configures an LPG storage tank for storing LPG and a fuel supply device for supplying LPG stored in the LPG storage tank to the engine within the limited space of a ship.

[0004] Previous technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2021-123119 Summary of the Invention

[0007] The technical problem to be solved by the invention

[0008] When liquefied petroleum gas (LPG) storage tanks or fuel supply systems are installed on ships, structures are required to protect the parts through which LPG flows as a countermeasure in case of LPG leakage. However, if all piping leading to the LPG storage tank is to be protected, the protective structure would require a large amount of material, potentially compromising economic efficiency. Therefore, efficient protection of the parts through which LPG flows is required.

[0009] This invention provides a liquefied gas supply device and a vessel capable of efficiently protecting the portion of the vessel through which liquefied gas flows.

[0010] means for solving technical problems

[0011] The liquefied petroleum gas (LPG) supply equipment for ships according to the present invention comprises: a storage tank disposed on an open deck of the hull and capable of storing LPG; and an outfitting with the storage tank disposed on the storage tank, a portion of which has a supply device for supplying the LPG stored in the storage tank to a consumption end, the outfitting with the storage tank comprising: an LPG flow section communicating with the storage tank and allowing the LPG to flow; a gas flow section for allowing the vaporized gas obtained by vaporizing the LPG to flow; and a protective cover formed in the shape of a box, which houses the LPG flow section and exposes the gas flow section.

[0012] The ship involved in this invention includes: the aforementioned liquefied gas supply equipment; and the hull, which is equipped with the liquefied gas supply equipment.

[0013] Invention Effects

[0014] The liquefied gas supply equipment and vessel of the present invention can efficiently protect the parts through which liquefied gas flows. Attached Figure Description

[0015] Figure 1 This is a general overall drawing showing the ship involved in the embodiments of the present invention.

[0016] Figure 2 This is a diagram illustrating the liquefied gas supply equipment for a ship according to the first embodiment of the present invention.

[0017] Figure 3 This is an enlarged view showing the main parts of the liquefied gas supply equipment of a ship according to the second embodiment of the present invention.

[0018] Figure 4 This is an enlarged view showing the main parts of the liquefied gas supply equipment of a ship according to the first variation of the second embodiment of the present invention.

[0019] Figure 5 This is an enlarged view of the main parts of the liquefied gas supply equipment of a ship according to a second variation of the second embodiment of the present invention.

[0020] Figure 6 This is an enlarged view showing the main parts of the liquefied gas supply equipment of a ship according to the third variation of the second embodiment of the present invention.

[0021] Figure 7 This is an enlarged view showing the main parts of the liquefied gas supply equipment of a ship according to the fourth variation of the second embodiment of the present invention.

[0022] Figure 8 This is an enlarged view showing the main parts of the liquefied gas supply equipment of a ship according to the third embodiment of the present invention.

[0023] Figure 9 This is an enlarged view showing the main parts of the liquefied gas supply equipment of a ship according to a modified example of the third embodiment of the present invention.

[0024] Figure 10 This is an enlarged view showing the main parts of the liquefied gas supply equipment of a ship according to the fourth embodiment of the present invention.

[0025] Figure 11 This is an enlarged view showing the main parts of the liquefied gas supply equipment of a ship according to the first variation of the fourth embodiment of the present invention.

[0026] Figure 12 This is an enlarged view of the main parts of the liquefied gas supply equipment of a ship according to the second variation of the fourth embodiment of the present invention.

[0027] Figure 13 This is an enlarged view showing the main parts of the liquefied gas supply equipment of a ship according to the third variation of the fourth embodiment of the present invention.

[0028] Figure 14 This is an enlarged view showing the main parts of the liquefied gas supply equipment of a ship according to the fifth embodiment of the present invention. Detailed Implementation

[0029] <First Implementation>

[0030] The following is for reference. Figure 1 and Figure 2 The first embodiment of the liquefied gas supply equipment 2 for the ship 1 involved in the present invention will be described in detail.

[0031] <The overall structure of the ship>

[0032] Ship 1 is capable of navigating using liquefied gas as fuel. For example... Figure 1 As shown, the vessel 1 of this embodiment includes a hull 10 and a liquefied gas supply system 2. The type of vessel 1 is not limited to a specific type. Examples of vessel types 1 include transport ships carrying liquefied natural gas (LNG), carbon dioxide, ammonia, etc.; ferries; RORO ships (Roll-on / Roll-off ships); PCTC (Pure Car & Truck Carriers), etc.

[0033] <Hull>

[0034] The hull 10 has a pair of side panels 11, a bottom 12, and an upper deck 13 that constitute its outer shell. The side panels 11 have a pair of side outer plates that form the port and starboard sides respectively. The bottom 12 has a bottom outer plate that connects these side panels 11. In addition, in this embodiment, the upper surface of the upper deck 13 facing vertically upwards is an open deck facing outwards.

[0035] <Liquefied Gas Supply Equipment>

[0036] The liquefied gas supply equipment 2 supplies liquefied gas to the consumption end. The liquefied gas supply equipment 2 includes a storage tank 20 and an outfitting 30 with the storage tank. In this embodiment, the liquefied gas supply equipment 2 is disposed on the hull 10.

[0037] <Storage Tank>

[0038] Storage tank 20 is disposed on hull 10. Storage tank 20 is a container capable of storing liquefied gas inside it. Examples of liquefied gas stored in storage tank 20 include liquefied carbon dioxide, LNG (Liquefied Natural Gas), and liquefied ammonia. In this embodiment, storage tank 20 is disposed, for example, on the open deck, i.e., upper deck 13, of hull 10. That is, storage tank 20 is disposed so that it is entirely exposed to the outside relative to hull 10. Storage tank 20 is fixed to upper deck 13 and cannot be moved. Storage tank 20 in this embodiment stores liquefied gas as fuel for burners such as main engines, auxiliary engines, and generator engines (not shown) housed within hull 10. In addition, storage tank 20 can store liquefied gas not used for navigation of ship 1. Furthermore, storage tank 20 is not limited to a structure disposed so as in this embodiment, which is entirely exposed to the outside relative to hull 10. For example, storage tank 20 can be disposed inside hull 10.

[0039] <Outfitting with storage tanks>

[0040] An outfitting 30 with a storage tank is mounted on the storage tank 20. A portion of the outfitting 30 with the storage tank includes a device for supplying liquefied petroleum gas (LPG) stored in the storage tank 20 to the consumption end. In this embodiment, the outfitting 30 with the storage tank, for example, can supply LPG held in the storage tank 20 to a fuel conditioning chamber (not shown), which adjusts the LPG to a predetermined temperature or pressure after phase change and vaporization before supplying it to the supply end. Furthermore, the outfitting 30 with the storage tank can vent BOG (boil-off gas) generated within the storage tank 20 to the outside of the storage tank 20. Figure 2 As shown, the outfitting 30 with storage tank in this embodiment includes a liquefied gas flow section 31, a gas flow section 32, and a protective cover 33.

[0041] <Liquefied Gas Distribution Department>

[0042] The liquefied petroleum gas (LPG) circulation section 31 is a region in which LPG circulates throughout the entire area of ​​the outfitting 30 with the storage tank. The LPG circulation section 31 is connected to the storage tank 20 and allows LPG to circulate. For example, the LPG circulation section 31 can supply LPG pressurized from the storage tank 20 via a pump or the like to a fuel conditioning chamber (not shown) via valves, instruments, and connectors. In this embodiment, the LPG circulation section 31 at least includes an LPG circulation section body 41 and an LPG supply pipe 42. Furthermore, while the case where the LPG circulation section 31 has an LPG supply pipe 42 for supplying LPG has been described, the LPG circulation section 31, as a pipe for supplying LPG, may also include, for example, an LPG return pipe that allows unused LPG to flow back into the storage tank 20, in addition to the LPG supply pipe 42.

[0043] <Liquefied Gas Distribution Section Main Body>

[0044] The main body 41 of the liquefied gas circulation section allows the liquefied gas supplied from the storage tank 20 to circulate. In addition to piping, the main body 41 of the liquefied gas circulation section is equipped with valves, instruments, connectors, etc., as needed. Under normal operating conditions of the ship 1, the liquefied gas circulates in the main body 41 of the liquefied gas circulation section.

[0045] <Liquefied Gas Supply Piping>

[0046] The liquefied petroleum gas (LPG) supplied to the exterior of the outfitting 30 with the storage tank flows through the LPG supply piping 42. That is, under normal operating conditions of the ship 1, the LPG flows through the LPG supply piping 42. Specifically, the LPG supply piping 42 is connected to the storage tank 20. The LPG supply piping 42 is a piping through which LPG can flow. The LPG supply piping 42 extends vertically upwards from the storage tank 20 toward the LPG flow section body 41. The LPG supply piping 42 supplies the LPG from the storage tank 20 to the LPG flow section body 41.

[0047] <Gas Circulation Department>

[0048] The gas flow section 32 is a region within the outfitting 30 with a storage tank where gaseous gas, or in other words, vaporized gas obtained by vaporizing liquefied petroleum gas, flows. The gas flow section 32 is connected to the storage tank 20. For example, the gas flow section 32 allows BOG (Botanicals Oxide Gas) accumulated in the storage tank 20 to circulate. The gas flow section 32 may include valves, instruments, connectors, etc., as needed.

[0049] <Protective Shield>

[0050] To prevent liquefied gas from leaking into the hull or other equipment, a protective cover 33 covers the area where the liquefied gas flows. That is, the protective cover 33 isolates the area where the liquefied gas flows from the external area within the outfitting 30 with the storage tank. In other words, the main body 41 of the liquefied gas flow section 31 in this embodiment is centrally located within the inner space of a protective cover 33. The protective cover 33 is, for example, box-shaped. While accommodating the liquefied gas flow section 31 internally, the protective cover 33 exposes the gas flow section 32. That is, the protective cover 33 does not cover the gas flow section 32, but only covers the liquefied gas flow section 31. The protective cover 33 in this embodiment has a bottom plate 51, a top plate 52, and side plates 53.

[0051] Furthermore, even the parts where liquefied gas flows, as long as they are used outside the normal operating conditions of the ship 1, may not be covered by the protective cover 33.

[0052] A base plate 51 is disposed on the storage tank 20. The base plate 51 is disposed at a distance from the upper surface of the storage tank 20 in the vertical direction. In this embodiment, the base plate 51 also serves as a platform on which an area accessible to workers is formed. The base plate 51 is formed into a rectangular flat plate extending in the horizontal direction. The base plate 51 supports the liquefied gas passage section 31 and the gas passage section 32 from below in the vertical direction. Furthermore, the base plate 51 has a plurality of through holes. Pipes for the liquefied gas passage section 31 and the gas passage section 32 are inserted into the plurality of through holes, respectively.

[0053] Furthermore, the piping for the liquefied gas flow section 31 and the gas flow section 32 is not limited to one each. Multiple piping can exist as needed and be inserted into the through holes.

[0054] The top plate 52 and the bottom plate 51 are arranged opposite each other. The top plate 52 is arranged vertically above the bottom plate 51 such that it forms a space between itself and the bottom plate 51, allowing for the placement of the liquefied gas flow section 31. The top plate 52 is formed as a rectangular flat plate extending horizontally. A space is formed between the bottom plate 51 and the top plate 52 that allows workers to enter. That is, the protective cover 33 is formed at a height that allows workers to enter. However, it is not limited to this and can also be formed at a height that prevents workers from entering.

[0055] Side plate 53 connects bottom plate 51 and top plate 52 throughout the circumference. Side plate 53 extends vertically from bottom plate 51 toward top plate 52. Side plate 53 is disposed around the entire circumference of bottom plate 51 and top plate 52 in such a way as to separate the space between bottom plate 51 and top plate 52 in the vertical direction from the outside.

[0056] <Effects>

[0057] According to the above structure, the protective cover 33 is configured to cover the liquefied gas flow section 31, while leaving the gas flow section 32 exposed. Therefore, the protective cover 33 can effectively cover only the area through which the liquefied gas passes, thus avoiding the area through which vaporized liquefied gas flows. Therefore, the portion through which the liquefied gas flows can be efficiently protected with a minimal protective cover 33. Furthermore, by providing efficient protection, the amount of material required for the protective cover 33 can be reduced.

[0058] <Second Implementation>

[0059] Next, the liquefied gas supply device 2 according to the second embodiment of the present invention will be described. Furthermore, in the second embodiment described below, structures common to the first embodiment described above are marked with the same symbols in the figures and their descriptions are omitted. In the second embodiment, the structure having the piping cover 60 differs from that in the first embodiment.

[0060] like Figure 3As shown, in the liquefied gas supply device 2 of the second embodiment, the protective cover 33 also has a piping cover 60 and a connecting part 61.

[0061] A piping cover 60 covers the liquefied gas supply pipe 42 in its entire circumference. The piping cover 60 is connected to the storage tank 20. The piping cover 60 communicates with the space between the bottom plate 51 and the top plate 52 through a through hole. That is, the storage tank 20 is connected to the bottom plate 51 with the liquefied gas supply pipe 42 inserted inside the piping cover 60. The piping cover 60 is formed as a cylinder extending vertically from the upper surface of the storage tank 20 to the bottom plate 51. The piping cover 60 is positioned with a gap relative to the outer circumferential surface of the liquefied gas supply pipe 42. The upper end of the piping cover 60 extends from the through hole to a position protruding vertically upward relative to the bottom plate 51. That is, the upper end of the piping cover 60 is positioned vertically between the bottom plate 51 and the top plate 52. Furthermore, the cross-sectional shape of the piping cover 60 can be, for example, circular or rectangular.

[0062] The connecting part 61 connects the base plate 51 to the piping cover 60. The connecting part 61 connects the upper end of the piping cover 60 to the edge of the through hole. Furthermore, the connecting part 61 connects the piping cover 60 in a manner that allows it to move relative to the base plate 51. In this embodiment, the connecting part 61 has a flange portion 62 and a bellows portion 63.

[0063] The flange portion 62 is integrally formed with the upper end of the pipe cover 60. In this embodiment, the flange portion 62 is integrally formed with the pipe cover 60 afterward, for example, by welding. The flange portion 62 protrudes horizontally toward the radially outer side of the pipe cover 60. The flange portion 62 is formed in a circular plate shape along the upper end of the pipe cover 60.

[0064] The bellows section 63 is extendable and retractable in both the horizontal and vertical directions. The bellows section 63 connects the edge of the through hole to the end of the flange section 62. The bellows section 63 is formed as a cylinder extending vertically upwards from the edge of the through hole to the end of the flange section 62. The bellows section 63 is positioned with a gap relative to the outer peripheral surface of the piping cover 60.

[0065] <Effects>

[0066] According to the above structure, the entire circumference of the liquefied gas supply pipe 42 connected to the storage tank 20 is covered by the pipe cover 60. The pipe cover 60, by connecting to the storage tank 20, can cover the liquefied gas supply pipe 42 from the connection point with the storage tank 20. Furthermore, the pipe cover 60 is connected to the bottom plate 51 via the connecting portion 61. That is, from the connection point with the storage tank 20 to the space surrounded by the bottom plate 51, top plate 52, and side plate 53, the liquefied gas supply pipe 42 can be protected by the protective cover 33 having the pipe cover 60 and the connecting portion 61. Therefore, the portion through which liquefied gas flows between the surface of the storage tank 20 and the protective cover 33 can be further protected.

[0067] According to the above structure, the storage tank 20 undergoes thermal deformation, contraction, and expansion / contraction based on the amount or temperature of the liquefied gas stored inside. Therefore, the positions of the piping cover 60 and the liquefied gas supply pipe 42 connected to the storage tank 20 also change due to the thermal deformation of the storage tank 20. However, the bottom plate 51 and the piping cover 60 move relative to each other via the connection portion 61. Therefore, even if the positions of the piping cover 60 connected to the storage tank 20 and the liquefied gas supply pipe 42 disposed therein move due to the thermal deformation of the storage tank 20, the connection portion 61 can absorb the amount of movement. Thus, the effect of relative movement between the bottom plate 51 and the piping cover 60 caused by the contraction of the storage tank 20 can be suppressed.

[0068] <First variation of the second embodiment>

[0069] Furthermore, the structure of the connecting part 61 is not limited to the structure described above. It can also employ... Figure 4 The structure shown in the figure is a first variation. In this example, the flange 70 is integrally formed with the base plate 51. In this embodiment, the flange 70 is integrally formed with the base plate 51 afterward, for example, by welding. The flange 70 has a support portion 71 protruding from the base plate 51 toward the inside of the outfitting 30 with the storage tank, and a flange body 72 integrally formed with the upper edge of the support portion 71. When viewed from above, the flange body 72 is annular. A bellows portion 63, identical to the bellows portion 63 described above, is provided on the lower surface of the flange 70. The bellows portion 63 connects the flange body 72 to the upper end of the piping cover 60. With this structure, the same functional effect as the structure described above can also be obtained.

[0070] <Second variation of the second embodiment>

[0071] Furthermore, as a second variation of the connecting part 61, it is also possible to adopt... Figure 5 The structure shown in the figure. In the example shown, the connecting part 61 has a bracket 81 and a corrugated ring part 82. The bracket 81 is integrally formed with the outer peripheral surface of the pipe cover 60. The corrugated ring part 82 connects the inner peripheral edge of the hole formed in the base plate 51 to the outer peripheral surface of the bracket 81. The corrugated ring part 82 is annular when viewed from above and below, and is formed of a resin material or the like capable of absorbing radial or circumferential loads. With this structure, the same effect as the structure described above can be obtained. In addition, the corrugated ring part 82 is not limited to being formed of a resin material or the like. For example, radial or circumferential loads can be absorbed by the material, and radial or circumferential loads can also be absorbed by the structure of the corrugated ring part 82. Furthermore, these can also be combined.

[0072] <Third variation of the second embodiment>

[0073] Furthermore, as a third variation of the connecting part 61, it is also possible to adopt... Figure 6 The structure shown in the figure. In the example shown, an annular cover 90 is integrally provided on the outer peripheral surface of the pipe cover 60. The annular cover 90 has an annular cover body 91 and a closing portion 92. The annular cover body 91 extends in a circular shape from the outer peripheral surface of the pipe cover 60 toward the outer peripheral side. The closing portion 92 is cylindrical, extending downward from the end edge of the outer peripheral side of the annular cover 90. Furthermore, a second closing portion 93, which is cylindrical and protrudes upward, is integrally provided at the end edge of the opening of the base plate 51. The second closing portion 93 is located closer to the inner peripheral side of the pipe cover 60 than the closing portion 92. A gap extending radially along the pipe cover 60 is formed between the closing portion 92 and the second closing portion 93. A gap is also formed between the second closing portion 93 and the annular cover body 91. Thus, the same functional effect as the structure described above can be obtained.

[0074] <Fourth variation of the second embodiment>

[0075] Furthermore, as a fourth variation, it is also possible to adopt... Figure 7 The structure shown in the figure. In the example shown, the space surrounded by the piping cover 60 and the liquefied gas supply piping 42 is filled with an insulating component 100. Specifically, the insulating component 100 is preferably made of a foaming resin such as polyurethane resin.

[0076] According to the above structure, the space between the liquefied gas supply pipe 42 and the pipe cover 60 is filled with the heat insulation component 100. As a result, gaps that would allow air cooled by liquefied gas through the liquefied gas supply pipe 42 to form between the liquefied gas supply pipe 42 and the pipe cover 60 can be suppressed. Moreover, by filling the space with the heat insulation component 100, heat transfer from the liquefied gas inside the liquefied gas supply pipe 42 to the outside of the pipe cover 60 can be suppressed. Therefore, condensation in the space formed between the liquefied gas supply pipe 42 and the pipe cover 60, or on the outside of the pipe cover 60, can be suppressed.

[0077] <Third Implementation Method>

[0078] Next, refer to Figure 8 The third embodiment of the present invention will now be described. Furthermore, structures identical to those in the above embodiments will be labeled with the same symbols, and detailed descriptions will be omitted.

[0079] like Figure 8As shown, similarly to the first embodiment, the liquefied gas supply equipment 2 in this embodiment includes a storage tank 20 and an outfitting 30 with the storage tank. The outfitting 30 with the storage tank includes a liquefied gas flow section 31, a gas flow section 32, and a protective cover 33. The liquefied gas flow section 31 has at least a liquefied gas supply pipe 42 connected to the storage tank 20 and allowing liquefied gas to flow through the storage tank 20. The protective cover 33 of this third embodiment includes a cover body 33A and a surrounding plate 110. Similar to the protective cover 33 of the first embodiment, the cover body 33A has a bottom plate 51, a top plate 52, and a side plate 53.

[0080] A retaining plate 110 extends from the storage tank 20 toward the bottom plate 51 to connect the storage tank 20 and the bottom plate 51. The retaining plate 110 covers the entire liquefied gas supply pipe 42 from the outside. That is, the retaining plate 110 covers the liquefied gas supply pipe 42 in its entire circumference. The retaining plate 110 in this third embodiment has a first blocking portion 111, a second blocking portion 112, and a blocking connecting portion 113. The first blocking portion 111 is cylindrical and extends downward toward the storage tank 20 from the lower surface of the bottom plate 51. The second blocking portion 112 is cylindrical and extends upward toward the bottom plate 51 from the outer surface of the storage tank 20. In addition, the cross-sectional shape of the first blocking portion 111 and the second blocking portion 112 can be, for example, circular or rectangular. The blocking connecting portion 113 is respectively provided on the first blocking portion 111 and the second blocking portion 112. The blocking connection portion 113 is annular, extending outward from the lower edge of the first blocking portion 111 and the upper edge of the second blocking portion 112. These two blocking connection portions 113 function as flanges, and are fixed together by bolts or the like when they are mated. However, the connection method between the first blocking portion 111 and the second blocking portion 112 is not limited to this; for example, they can be connected by welding. Alternatively, the blocking connection portion 113 can be annular, extending inward from the lower edge of the first blocking portion 111 and the upper edge of the second blocking portion 112, and fixed together. Furthermore, the enclosure 110 can be configured to provide space for personnel to enter.

[0081] (Effects)

[0082] According to the above structure, the storage tank 20 undergoes thermal deformation, contraction, and expansion / contraction based on the amount of liquefied gas stored inside. Therefore, the position of the liquefied gas supply pipe 42 connected to the storage tank 20 also changes due to the thermal deformation of the storage tank 20. However, the cover body 33A is connected to the storage tank 20 by a surrounding plate 110 that covers the liquefied gas supply pipe 42 throughout its circumference. Even if the position of the liquefied gas supply pipe 42 connected to the storage tank 20 moves due to the thermal deformation of the storage tank 20, it can still be moved within the surrounding plate 110. This suppresses the effect of movement of the liquefied gas supply pipe 42 caused by the contraction of the storage tank 20. Furthermore, the liquefied gas supply pipe 42 can be protected from the connection portion to the storage tank 20 to the space inside the cover body 33A by the surrounding plate 110 and the cover body 33A. Therefore, the portion through which liquefied gas flows between the surface of the storage tank 20 and the cover body 33A can be further protected. Furthermore, the enclosure 110 is designed so that workers can enter its interior, which also facilitates maintenance.

[0083] <Modifications of the Third Embodiment>

[0084] like Figure 9 As a variation, a structure in which an insulation member 120 is provided on the outer peripheral surface of the liquefied gas supply pipe 42 can also be adopted. According to this structure, the insulation member 120 contacts and is fixed to the outer peripheral surface of the liquefied gas supply pipe 42 in such a way that it covers the outer peripheral surface. Therefore, heat transfer from the liquefied gas inside the liquefied gas supply pipe 42 to the outside of the liquefied gas supply pipe 42 can be suppressed. Therefore, condensation on the outside of the liquefied gas supply pipe 42 can be suppressed.

[0085] <Fourth Implementation>

[0086] Next, refer to Figure 10 The fourth embodiment of the present invention will now be described. Furthermore, structures identical to those in the above embodiments will be labeled with the same symbols, and detailed descriptions will be omitted.

[0087] like Figure 10 As shown, in the liquefied gas supply device 2 according to this embodiment, the protective cover 33 has: a connecting opening 130 that connects the interior to the exterior; and a shielding part 131 that covers the connecting opening 130 to prevent liquid from passing through while allowing gas to pass through. The connecting opening 130 is mainly provided on the side plate 53 of the protective cover 33. As the shielding part 131, a mesh component or a porous component is preferably used.

[0088] (Effects)

[0089] According to the above structure, by covering the shielding portion 131 of the communicating opening 130, gas can pass between the inside and outside of the protective cover 33, while preventing liquid from passing between the inside and outside of the protective cover 33. Therefore, it is possible to prevent liquefied gas from being discharged to the outside of the protective cover 33 or rainwater from intruding into the inside of the protective cover 33, while simultaneously allowing natural ventilation to exchange air inside the protective cover 33.

[0090] <First Variation of the Fourth Embodiment>

[0091] As a first variation, it is also possible to adopt Figure 11 The structure shown in the figure. In the example shown, the shielding portion 140 is provided on the inner and outer sides of the connecting opening 130. Specifically, the shielding portion 140 has: a support body 141 extending inward and outward from the upper end edge of the connecting opening 130, respectively; and a shielding portion body 142 extending downward from the inner and outer end edges of the support body 141, respectively. The shielding portion body 142 covers the connecting opening 130 while facing the lower wall of the connecting opening 130 through a gap. Gas can flow through this gap and the connecting opening 130 itself. With this structure, the same effect as the structure described above can also be obtained.

[0092] <Second variation of the fourth embodiment>

[0093] As a second variation, it is also possible to adopt Figure 12 The structure shown in the figure. In the example shown, the shielding portion 150 has a plurality of rim-shaped members 151. Multiple rim-shaped members 151 are arranged at intervals in the vertical direction from the upper end to the lower end of the connecting opening 130. Each rim-shaped member 151 is C-shaped, extending inward and outward from top to bottom. With this structure, the same functional effect as the structure described above can be achieved.

[0094] <Third variation of the fourth embodiment>

[0095] As a third variation, it can also be adopted Figure 13 The structure shown in the figure. In the example shown, the connecting opening 130 is formed on the top plate 52 of the protective cover 33. The shielding part 160 covers the connecting opening 130 from above through a gap. The shielding part 160 is fixed to the top plate 52 via a support member (not shown). With this structure, the same effect as the structure described above can be achieved.

[0096] <Fifth Implementation>

[0097] Next, refer to Figure 14 The fifth embodiment of the present invention will now be described. Furthermore, structures identical to those in the above embodiments will be labeled with the same symbols, and detailed descriptions will be omitted.

[0098] like Figure 14 As shown, in the protective cover 33 according to this embodiment, the top plate 52 has multiple (two in one example) maintenance hatches 170, which communicate with the interior and allow various devices constituting the liquefied gas circulation section 31 to pass through. The maintenance hatches 170 are normally closed. However, during maintenance, the doors can be opened and the internal devices can be moved to the outside. A portable boom 171 (lifting equipment) capable of suspending heavy objects is provided near the maintenance hatches 170. The portable boom 171 can be loaded and unloaded as needed. Furthermore, a scaffold 172 accessible to workers is provided near the maintenance hatches 170. A ladder 173 for climbing up the top plate 52 from the deck is provided at the end of the scaffold 172.

[0099] According to the above structure, the protective cover 33 can protect the part supplying liquefied gas while maintaining the liquefied gas flow section 31 inside the protective cover 33 through the maintenance hatch 170. Furthermore, the device constituting the liquefied gas flow section 31 can be moved to the upper vertical direction through the maintenance hatch 170. This improves the maintainability of the liquefied gas supply equipment 2.

[0100] <Other Implementation Methods>

[0101] The various embodiments of the present invention have been described above. Furthermore, various changes or modifications can be made to the above structure without departing from the spirit of the present invention. For example, in the above embodiments, an example of providing a pipe cover 60 for a single liquefied gas supply pipe 42 has been described. However, it is also possible to adopt a structure that provides a pipe cover 60 for multiple pipes including other pipes. Even in this case, the same effect as the structure described above can be obtained.

[0102] <Postscript>

[0103] The liquefied gas supply equipment for ships described in each embodiment can be understood, for example, as follows.

[0104] (1) The liquefied gas supply equipment 2 of the ship 1 involved in the first method includes: a storage tank 20, which is disposed on the open deck of the hull 10 and is capable of storing liquefied gas; and an outfitting 30 with a storage tank, which is disposed on the storage tank 20 and has a portion thereof having a supply device for supplying the liquefied gas stored in the storage tank 20 to the consumption end. The outfitting 30 with a storage tank includes: a liquefied gas flow section 31, which is connected to the storage tank 20 and allows the liquefied gas to flow; a gas flow section 32, which allows the vaporized gas obtained by vaporizing the liquefied gas to flow; and a protective cover 33, which is formed in the shape of a box and houses the liquefied gas flow section 31 inside it and exposes the gas flow section 32.

[0105] Based on the above structure, the parts through which liquefied gas flows can be effectively protected. Furthermore, by providing efficient protection, the amount of material required for the protective cover 33 can be reduced.

[0106] (2) The liquefied gas supply equipment 2 of the ship 1 involved in the second method is the liquefied gas supply equipment 2 of the ship 1 in (1), wherein the liquefied gas circulation section 31 has a liquefied gas supply pipe 42, the liquefied gas supply pipe 42 is connected to the storage tank 20 and allows the liquefied gas in the storage tank 20 to circulate, and the protective cover 33 includes: a bottom plate 51, which is disposed on the storage tank 20 and has a through hole; a top plate 52, which is disposed opposite to the bottom plate 51; a side plate 53, which connects the bottom plate 51 and the top plate 52 in the entire circumferential direction; a pipe cover 60, which is connected to the storage tank 20 and communicates with the space between the bottom plate 51 and the top plate 52 through the through hole, and covers the liquefied gas supply pipe 42 in the entire circumferential direction; and a connecting part 61, which connects the bottom plate 51 and the pipe cover 60.

[0107] According to the above structure, the portion that allows liquefied gas to flow between the surface of the storage tank 20 and the protective cover 33 can be further protected.

[0108] (3) The liquefied gas supply equipment 2 of the ship 1 involved in the third method is the liquefied gas supply equipment 2 of the ship 1 in (2), wherein the connecting part 61 connects the piping cover 60 in a manner that allows it to move relative to the bottom plate 51.

[0109] According to the above structure, the effect of relative movement between the bottom plate 51 and the piping cover 60 caused by the contraction of the storage tank 20 can be suppressed.

[0110] (4) The liquefied gas supply equipment 2 of the ship 1 involved in the fourth method is the liquefied gas supply equipment 2 of the ship 1 of (2) or (3), wherein the outfitting 30 with storage tank has an insulation component 100, the insulation component 100 being filled in the space surrounded by the liquefied gas supply pipe 42 and the pipe cover 60.

[0111] According to the above structure, it is possible to suppress moisture condensation in the space formed between the liquefied gas supply pipe 42 and the pipe cover 60, or on the outside of the pipe cover 60.

[0112] (5) The liquefied gas supply equipment 2 of the ship 1 involved in the fifth method is the liquefied gas supply equipment 2 of the ship 1 in (1) to (4), wherein the liquefied gas circulation section 31 has a liquefied gas supply pipe 42, the liquefied gas supply pipe 42 is connected to the storage tank 20 and allows the liquefied gas in the storage tank 20 to circulate, and the protective cover 33 has: a cover body 33A, fixed to the storage tank 20; and a surrounding plate 110, which covers the liquefied gas supply pipe 42 in the entire circumference and extends from the storage tank 20 toward the cover body 33A to connect the storage tank 20 and the cover body 33A.

[0113] The above structure further protects the portion through which liquefied gas flows between the surface of the storage tank 20 and the protective cover 33. It also simplifies maintenance.

[0114] (6) The liquefied gas supply equipment 2 of the ship 1 involved in the sixth method is the liquefied gas supply equipment 2 of the ship 1 in (5), which has an insulation component 120, which contacts and is fixed to the liquefied gas supply pipe 42 in such a way as to cover the outer peripheral surface of the liquefied gas supply pipe 42.

[0115] Based on the above structure, it is possible to suppress the formation of moisture condensation on the outside of the liquefied gas supply pipe 42.

[0116] (7) The liquefied gas supply equipment 2 of the ship 1 involved in the seventh method is the liquefied gas supply equipment 2 of the ship 1 in (1) to (6), wherein the protective cover 33 has: a connecting opening 130 to connect the interior with the exterior; and a shielding part 131 to cover the connecting opening 130 to prevent the liquid from passing through while allowing the gas to pass through.

[0117] According to the above structure, the air inside the protective cover 33 can be exchanged through natural ventilation.

[0118] (8) The liquefied gas supply equipment 2 of the ship 1 involved in the eighth method is the liquefied gas supply equipment 2 of the ship 1 in (2) to (7), wherein the protective cover 33 has a maintenance hatch 170 on the top plate 52, the maintenance hatch 170 is connected to the interior and can allow the device constituting the liquefied gas circulation section 31 to pass through.

[0119] According to the above structure, the part through which liquefied gas flows can be protected by the protective cover 33 while maintenance can be carried out.

[0120] (9) The vessel 1 involved in the ninth method has: (1) to (8) liquefied gas supply equipment 2; and the hull 10 is equipped with the liquefied gas supply equipment 2.

[0121] Based on the above structure, the part that allows the liquefied gas to circulate in the ship 1 can be effectively protected.

[0122] Industrial availability

[0123] The liquefied gas supply equipment and vessel of the present invention can efficiently protect the parts through which liquefied gas flows.

[0124] Symbol Explanation

[0125] 1-Ship, 2-Liquefied gas supply equipment, 10-Hull, 11-Side, 12-Bottom, 13-Upper deck, 20-Storage tank, 30-Outfitting with storage tank, 31-Liquefied gas circulation section, 32-Gas circulation section, 33-Protective cover, 33A-Main body of cover, 41-Main body of liquefied gas circulation section, 42-Liquefied gas supply piping, 51-Bottom plate, 52-Top plate, 53-Side plate, 60-Pipe cover, 61-Connection, 62-Flange, 63-Bellpipe, 70-Flange, 71-Support, 72-Main body of flange, 81-Bracket, 82-Bellpipe 90-ring-shaped cover, 91-ring-shaped cover body, 92-closing part, 93-second closing part, 100-insulating component, 110-enclosure plate, 111-first blocking part, 112-second blocking part, 113-blocking connection part, 120-insulating component, 130-connecting opening, 131-shielding part, 140-shielding part, 141-support body, 142-shielding part body, 150-shielding part, 151-edge-shaped component, 160-shielding part, 170-maintenance hatch, 171-portable boom, 172-scaffolding, 173-ladder.

Claims

1. A liquefied gas supply system for a ship, comprising: Storage tanks, located on the open deck of the ship, are capable of storing liquefied gas; and An outfitting with a storage tank is mounted on the storage tank, and a portion thereof has means for supplying the liquefied gas stored in the storage tank to the consumption end. The outfitting with the storage tank includes: A liquefied gas circulation section is connected to the storage tank and allows the liquefied gas to circulate. The gas flow section allows the vaporized gas obtained by vaporizing the liquefied gas to flow through; and The protective cover is box-shaped and houses the liquefied gas passage inside, while exposing the gas passage.

2. The liquefied gas supply equipment for ships according to claim 1, wherein, The liquefied gas circulation section has a liquefied gas supply pipe connected to the storage tank, allowing the liquefied gas to circulate within the tank. The protective cover has the following features: A base plate is disposed on the storage tank and has a through hole for the liquefied gas supply pipe to pass through; A top plate, configured opposite to the bottom plate; Side plates connect the bottom plate and the top plate throughout the circumference; A piping cover is connected to the storage tank and communicates with the space between the bottom plate and the top plate through the through hole, and covers the liquefied gas supply piping in the entire circumference. and The connecting part connects the base plate to the pipe cover.

3. The liquefied gas supply equipment for ships according to claim 2, wherein, The connecting part connects the piping cover in a manner that allows it to move relative to the base plate.

4. The liquefied gas supply equipment for a ship according to claim 2 or 3, wherein, The outfitting with the storage tank is equipped with insulation components that fill the space surrounded by the liquefied gas supply piping and the piping cover.

5. The liquefied gas supply equipment for ships according to claim 1, wherein, The liquefied gas circulation section has a liquefied gas supply pipe connected to the storage tank, allowing the liquefied gas to circulate within the tank. The protective cover has: a cover body fixed to the storage tank; and a surrounding panel that covers the liquefied gas supply pipe in its entire circumference and extends from the storage tank toward the cover body to connect the storage tank and the cover body.

6. The liquefied gas supply equipment for a ship according to claim 5, comprising an insulating component that contacts and is fixed to the outer peripheral surface of the liquefied gas supply piping in such a manner as to cover it.

7. The liquefied gas supply equipment for a ship according to claim 1 or 2, wherein, The protective cover has: a communicating opening that allows the interior to communicate with the exterior; and a shielding portion that covers the communicating opening to prevent liquid from passing through while allowing gas to pass through.

8. The liquefied gas supply equipment for ships according to claim 2, wherein, The protective cover has a maintenance hatch on the top plate, which communicates with the interior and allows the passage of devices constituting the liquefied gas circulation section.

9. A ship having: The liquefied gas supply device according to claim 1 or 2; and The hull is equipped with the liquefied gas supply equipment.

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