Liquefied gas supply system for ship, and ship

Abstract

This liquefied gas supply system comprises: a tank that is disposed on the weather deck of a hull and can store liquefied gas; and tank-attached equipment that is disposed on the tank and includes part of a device for supplying the liquefied gas stored in the tank to a consumption destination. The tank-attached equipment comprises: a liquefied gas circulation part that is in communication with the tank and circulates the liquefied gas; a gas circulation part that circulates vaporized gas obtained by vaporizing the liquefied gas; and a protective cover that is formed in the shape of a box and accommodates the liquefied gas circulation part therein with the gas circulation part exposed.

Description

Liquefied gas supply equipment for ships and ships

[0001] This application claims priority to Japanese Patent Application No. 2024-057732, filed on March 29, 2024, the contents of which are incorporated herein by reference.

[0002] Patent Document 1 discloses a configuration in which a liquefied gas tank for storing liquefied gas and a fuel supply device for supplying the liquefied gas stored in the liquefied gas tank to an engine are efficiently arranged in the limited space of a ship.

[0003] Japanese Patent Application Laid-Open No. 2021-123119

[0004] When a ship is equipped with a liquefied gas tank or a fuel supply system, a structure is required to protect the areas through which the liquefied gas flows as a measure against liquefied gas leaks. Protecting all of the piping leading to the liquefied gas tank would require more materials than necessary, potentially resulting in a loss of economic viability. Therefore, efficient protection of the areas through which the liquefied gas flows is required.

[0005] The present disclosure provides a liquefied gas supply facility for a ship that can efficiently protect parts through which liquefied gas flows, and the ship.

[0006] A liquefied gas supply system for a ship according to the present disclosure comprises a tank arranged on an exposed deck of a hull and capable of storing liquefied gas, and a tank-equipped outfitting arranged on the tank and having a supply device in part for supplying the liquefied gas stored in the tank to a consumer, the tank-equipped outfitting comprising a liquefied gas distribution section communicating with the tank and distributing the liquefied gas, a gas distribution section distributing gas obtained by vaporizing the liquefied gas, and a protective cover formed in a box shape and accommodating the liquefied gas distribution section therein and exposing the gas distribution section. A ship according to the present disclosure comprises the above-mentioned liquefied gas supply system and the hull in which the liquefied gas supply system is arranged.

[0007] According to the liquefied gas supply equipment for a ship and the ship disclosed herein, the parts through which liquefied gas flows can be efficiently protected.

[0008] FIG. 1 is an overall view showing an outline of a ship according to an embodiment of the present disclosure. FIG. 2 is a view showing a liquefied gas supply system for a ship according to a first embodiment of the present disclosure. FIG. 3 is an enlarged view of a main portion of a liquefied gas supply system for a ship according to a second embodiment of the present disclosure. FIG. 4 is an enlarged view of a main portion of a liquefied gas supply system for a ship according to a first modified example of the second embodiment of the present disclosure. FIG. 5 is an enlarged view of a main portion of a liquefied gas supply system for a ship according to a second modified example of the second embodiment of the present disclosure. FIG. 6 is an enlarged view of a main portion of a liquefied gas supply system for a ship according to a third modified example of the second embodiment of the present disclosure. FIG. 7 is an enlarged view of a main portion of a liquefied gas supply system for a ship according to a fourth modified example of the second embodiment of the present disclosure. FIG. 8 is an enlarged view of a main portion of a liquefied gas supply system for a ship according to a third modified example of the present disclosure. FIG. 9 is an enlarged view of a main portion of a liquefied gas supply system for a ship according to a modified example of the third embodiment of the present disclosure. FIG. 10 is an enlarged view of a main portion of a liquefied gas supply system for a ship according to a fourth embodiment of the present disclosure. FIG. 11 is an enlarged view of a main portion of a liquefied gas supply system for a ship according to a first modified example of the fourth embodiment of the present disclosure. FIG. 12 is an enlarged view of a main portion of a liquefied gas supply system for a ship according to a second modified example of the fourth embodiment of the present disclosure. 10 is an enlarged view of a main portion of a liquefied gas supply system for a vessel according to a third modified example of the fourth embodiment of the present disclosure, and FIG. 11 is an enlarged view of a main portion of a liquefied gas supply system for a vessel according to a fifth embodiment of the present disclosure.

[0009] First Embodiment A first embodiment of a liquefied gas supply facility 2 for a ship 1 according to the present disclosure will be described in detail below with reference to FIGS. 1 and 2 .

[0010] <Overall Configuration of Ship> The ship 1 is capable of sailing using liquefied gas as fuel. As shown in Fig. 1 , the ship 1 of this embodiment includes a hull 10 and a liquefied gas supply facility 2. The type of ship 1 is not limited to a specific one. Examples of the type of ship 1 include a carrier of liquefied gas such as liquefied natural gas (LNG), carbon dioxide, or ammonia, a ferry, a roll-on / roll-off ship (RORO ship), or a pure car & truck carrier (PCTC).

[0011] <Hull> The hull 10 has a pair of side panels 11 that form its outer hull, a bottom panel 12, and an upper deck 13. The side panels 11 have a pair of side panel shells that form the port and starboard sides, respectively. The bottom panel 12 has a bottom panel shell that connects the side panels 11. In this embodiment, the upper surface of the upper panel 13 that faces vertically upward is an exposed deck that faces the outside.

[0012] <Liquefied Gas Supply Facility> The liquefied gas supply facility 2 supplies liquefied gas to a consumer. The liquefied gas supply facility 2 includes a tank 20 and a tank-equipped rigging 30. The liquefied gas supply facility 2 of this embodiment is disposed in a hull 10.

[0013] <Tank> The tank 20 is disposed in the hull 10. The tank 20 is a container capable of storing liquefied gas therein. Examples of liquefied gas stored in the tank 20 include liquefied carbon dioxide, LNG (Liquefied Natural Gas), and liquefied ammonia. In this embodiment, the tank 20 is disposed, for example, on the upper deck 13, which is an exposed deck of the hull 10. That is, the tank 20 is disposed so that its entirety is exposed to the outside of the hull 10. The tank 20 is immovably fixed to the upper deck 13. In this embodiment, the tank 20 stores liquefied gas as fuel for combustors of the main engine, auxiliary engine, generator engine (none of which are shown) housed within the hull 10. Note that the tank 20 may store liquefied gas that is not used for navigation of the ship 1. Furthermore, the tank 20 is not limited to a structure in which its entirety is exposed to the outside of the hull 10 as in this embodiment. For example, the tank 20 may be disposed inside the hull 10.

[0014] <Tank-equipped rigging> The tank-equipped rigging 30 is disposed on the tank 20. The tank-equipped rigging 30 includes a device for supplying the liquefied gas stored in the tank 20 to a consumer. The tank-equipped rigging 30 of this embodiment is capable of supplying the liquefied gas stored in the tank 20 to, for example, a fuel adjustment chamber (not shown) that vaporizes the liquefied gas by changing its phase, adjusts the temperature and pressure, and supplies the gas to a destination. The tank-equipped rigging 30 is also capable of discharging boil-off gas (BOG) generated in the tank 20 to the outside of the tank 20. As shown in FIG. 2 , the tank-equipped rigging 30 of this embodiment includes a liquefied gas circulation section 31, a gas circulation section 32, and a protective cover 33.

[0015] <Liquefied Gas Distribution Section> The liquefied gas distribution section 31 is a section of the entire tank-equipped rigging 30 through which liquefied gas is distributed. The liquefied gas distribution section 31 is connected to the tank 20 and distributes liquefied gas therethrough. For example, the liquefied gas distribution section 31 is capable of supplying liquefied gas, which is pressurized and supplied from the tank 20 via a pump or the like, to a fuel adjustment chamber (not shown) or the like via a valve, a meter, a joint, or the like. The liquefied gas distribution section 31 of this embodiment at least includes a liquefied gas distribution section main body 41 and a liquefied gas supply pipe 42. While the liquefied gas distribution section 31 has been described as including the liquefied gas supply pipe 42 through which liquefied gas is supplied, the liquefied gas distribution section 31 may also include, in addition to the liquefied gas supply pipe 42, a liquefied gas return pipe through which unused liquefied gas is returned to the tank 20, for example, as a pipe through which liquefied gas is distributed.

[0016] <Liquefied gas circulation unit main body> The liquefied gas circulation unit main body 41 circulates the liquefied gas supplied from the tank 20. The liquefied gas circulation unit main body 41 includes, in addition to piping, valves, meters, joints, and the like as necessary. Liquefied gas circulates through the liquefied gas circulation unit main body 41 when the ship 1 is in a normal operating state.

[0017] <Liquefied gas supply piping> Liquefied gas to be sent to the outside of the tank-equipped rigging 30 flows through the liquefied gas supply piping 42. In other words, liquefied gas flows through the liquefied gas supply piping 42 when the ship 1 is in normal operating condition. Specifically, the liquefied gas supply piping 42 is connected to the tank 20. The liquefied gas supply piping 42 is a piping through which liquefied gas can flow. The liquefied gas supply piping 42 extends straight upward in the vertical direction from the tank 20 toward the liquefied gas flow unit main body 41. The liquefied gas supply piping 42 sends liquefied gas sent from the tank 20 to the liquefied gas flow unit main body 41.

[0018] <Gas circulation section> The gas circulation section 32 is an area in the tank-equipped rigging 30 that circulates gas in a gaseous state, in other words, vaporized gas obtained by vaporizing liquefied gas. The gas circulation section 32 is connected to the tank 20. For example, BOG accumulated in the tank 20 circulates through the gas circulation section 32. The gas circulation section 32 is equipped with valves, meters, joints, etc. as necessary.

[0019] <Protective Cover> The protective cover 33 covers the area through which the liquefied gas flows to prevent the liquefied gas from leaking into the hull, other equipment, etc. In other words, the protective cover 33 separates the area through which the liquefied gas flows from the external area in the tank-equipped rigging 30. In other words, the liquefied gas flow section main bodies 41 of the liquefied gas flow sections 31 of this embodiment are arranged together in the inner space of a single protective cover 33. The protective cover 33 is formed, for example, in a box shape. The protective cover 33 houses the liquefied gas flow section 31 therein and exposes the gas flow section 32. In other words, the protective cover 33 covers only the liquefied gas flow section 31 without covering the gas flow section 32. The protective cover 33 of this embodiment has a bottom plate 51, a top plate 52, and side plates 53. Furthermore, even if a part is through which liquefied gas flows, it does not need to be covered by the protective cover 33 if it is used outside the normal operating state of the ship 1.

[0020] The bottom plate 51 is disposed on the tank 20. The bottom plate 51 is disposed vertically above the upper surface of the tank 20 with a gap therebetween. In this embodiment, the bottom plate 51 also serves as a platform, forming an area above which workers can pass. The bottom plate 51 is formed in a rectangular flat plate shape extending horizontally. The bottom plate 51 supports the liquefied gas circulation section 31 and the gas circulation section 32 from below in the vertical direction. The bottom plate 51 also has a plurality of through-holes. One pipe for the liquefied gas circulation section 31 and one pipe for the gas circulation section 32 are inserted into each of the plurality of through-holes. Note that the number of pipes for the liquefied gas circulation section 31 and the gas circulation section 32 is not limited to one each. If necessary, a plurality of pipes for each may be provided and inserted into the through-holes.

[0021] The top plate 52 is disposed opposite the bottom plate 51. The top plate 52 is disposed vertically above the bottom plate 51 so as to form a space between the top plate 52 and the bottom plate 51 in which the liquefied gas flow section 31 can be disposed. The top plate 52 is formed in the shape of a rectangular flat plate that extends horizontally. A space is formed between the bottom plate 51 and the top plate 52 into which an operator can enter. In other words, the protective cover 33 is formed at a height that allows an operator to enter. However, this is not limited to this, and the protective cover 33 may be formed at a height that prevents an operator from entering.

[0022] The side plates 53 connect the bottom plate 51 and the top plate 52 around the entire periphery. The side plates 53 also extend straight in the vertical direction from the bottom plate 51 toward the top plate 52. The side plates 53 are arranged around the entire periphery of the bottom plate 51 and the top plate 52 so as to separate the space between the bottom plate 51 and the top plate 52 in the vertical direction from the outside.

[0023] <Effects> According to the above configuration, the protective cover 33 is installed so as to cover the liquefied gas flow portion 31 while exposing the gas flow portion 32. Therefore, the protective cover 33 can efficiently cover only the area through which the liquefied gas passes, excluding the area through which the vaporized liquefied gas flows. Therefore, the portion through which the liquefied gas flows can be efficiently protected with a minimum number of protective covers 33. Furthermore, efficient protection can reduce the amount of material required for the protective covers 33.

[0024] Second Embodiment Next, a liquefied gas supply facility 2 according to a second embodiment of the present disclosure will be described. In the second embodiment described below, components common to the first embodiment will be denoted by the same reference numerals in the drawings, and description thereof will be omitted. The second embodiment differs from the first embodiment in the configuration including a piping cover 60.

[0025] As shown in FIG. 3 , in the liquefied gas supply facility 2 of the second embodiment, the protective cover 33 further includes a piping cover 60 and a connection portion 61 .

[0026] The pipe cover 60 covers the entire periphery of the liquefied gas supply pipe 42. The pipe cover 60 is connected to the top of the tank 20. The pipe cover 60 is in communication with the space between the bottom plate 51 and the top plate 52 through a through-hole. In other words, the pipe cover 60 connects the tank 20 and the bottom plate 51 with the liquefied gas supply pipe 42 inserted therethrough. The pipe cover 60 is formed in a cylindrical shape extending straight in the vertical direction from the upper surface of the tank 20 to the bottom plate 51. The pipe cover 60 is disposed with a gap from the outer peripheral surface of the liquefied gas supply pipe 42. The upper end of the pipe cover 60 extends from the through-hole to a position protruding vertically upward relative to the bottom plate 51. In other words, the upper end of the pipe cover 60 is disposed between the bottom plate 51 and the top plate 52 in the vertical direction. The cross-sectional shape of the pipe cover 60 may be, for example, circular or rectangular.

[0027] The connection portion 61 connects the bottom plate 51 and the piping cover 60. The connection portion 61 connects the upper end of the piping cover 60 and the edge of the through hole. The connection portion 61 also connects the piping cover 60 to the bottom plate 51 so that the piping cover 60 can move relative to the bottom plate 51. The connection portion 61 in this embodiment has a flange portion 62 and a bellows portion 63.

[0028] The flange portion 62 is integrally formed at the upper end of the piping cover 60. In this embodiment, the flange portion 62 is formed integrally with the piping cover 60 afterward, for example, by welding. The flange portion 62 protrudes horizontally toward the outside in the radial direction of the piping cover 60. The flange portion 62 is formed in a disk shape along the upper end of the piping cover 60.

[0029] The bellows portion 63 is expandable and contractible in the horizontal and vertical directions. The bellows portion 63 connects the edge of the through hole and the end of the flange portion 62. The bellows portion 63 is formed in a cylindrical shape that extends vertically upward from the edge of the through hole to the end of the flange portion 62. The bellows portion 63 is arranged with a gap between it and the outer peripheral surface of the piping cover 60.

[0030] <Effects> According to the above configuration, the liquefied gas supply pipe 42 connected to the tank 20 is covered all around by the pipe cover 60. Because the pipe cover 60 is connected to the tank 20, it is possible to cover the liquefied gas supply pipe 42 from the connection portion with the tank 20. Furthermore, the pipe cover 60 is connected to the bottom plate 51 by the connection portion 61. In other words, the liquefied gas supply pipe 42 can be protected by the pipe cover 60 and the protective cover 33 having the connection portion 61 from the connection portion with the tank 20 to the space surrounded by the bottom plate 51, the top plate 52, and the side plate 53. Therefore, it is possible to further protect the portion through which liquefied gas flows between the surface of the tank 20 and the protective cover 33.

[0031] According to the above configuration, the tank 20 undergoes thermal deformation, contraction, and expansion depending on the amount and temperature of the liquefied gas stored therein. Therefore, the positions of the piping cover 60 and the liquefied gas supply piping 42 connected to the tank 20 also change in accordance with the thermal deformation of the tank 20. However, the connection part 61 allows the bottom plate 51 and the piping cover 60 to move relative to each other. Therefore, even if the positions of the piping cover 60 connected to the tank 20 and the liquefied gas supply piping 42 disposed therein move in accordance with the thermal deformation of the tank 20, the connection part 61 can absorb the amount of movement. This makes it possible to suppress the influence of the relative movement between the bottom plate 51 and the piping cover 60 caused by the contraction of the tank 20.

[0032] <First Modification of Second Embodiment> The structure of the connection portion 61 is not limited to the above-described structure. A configuration shown as a first modification in FIG. 4 may also be employed. In the example shown in FIG. 4 , the flange portion 70 is integrally formed with the bottom plate 51. The flange portion 70 of this embodiment is, for example, formed integrally with the bottom plate 51 afterward by welding. The flange portion 70 includes a support portion 71 that protrudes from the bottom plate 51 toward the inside of the tank-equipped rigging 30, and a flange portion main body 72 that is integrally formed with the upper edge of the support portion 71. The flange portion main body 72 has an annular shape when viewed from the top and bottom. A bellows portion 63 similar to that described above is provided on the downward-facing surface of the flange portion 70. The bellows portion 63 connects the flange portion main body 72 to the upper end of the piping cover 60. This configuration also provides the same effects as those described above.

[0033] <Second Modification of Second Embodiment> A second modification of the connecting portion 61 may have the configuration shown in FIG. 5 . In the example shown in FIG. 5 , the connecting portion 61 includes a stay 81 and a corrugated ring portion 82. The stay 81 is integrally formed on the outer peripheral surface of the pipe cover 60. The corrugated ring portion 82 connects the inner peripheral edge of a hole formed in the bottom plate 51 to the outer peripheral surface of the stay 81. The corrugated ring portion 82 has an annular shape when viewed from the top and bottom and is formed of a resin material or the like capable of absorbing radial and circumferential loads. This configuration can also achieve the same effects as those described above. Note that the corrugated ring portion 82 is not limited to being formed of a resin material or the like. For example, the material may be capable of absorbing radial and circumferential loads, or the structure of the corrugated ring portion 82 may be capable of absorbing radial and circumferential loads. These may also be combined.

[0034] <Third Modification of Second Embodiment> Furthermore, as a third modification of the connection portion 61, the configuration shown in FIG. 6 can be employed. In the example shown in the figure, a ring-shaped cover 90 is integrally provided on the outer peripheral surface of the piping cover 60. The ring-shaped cover 90 has a ring-shaped cover main body 91 and a closing portion 92. The ring-shaped cover main body 91 extends in an annular shape from the outer peripheral surface of the piping cover 60 toward the outer periphery. The closing portion 92 is cylindrical and extends downward from the outer peripheral edge of the ring-shaped cover 90. In addition, a second closing portion 93, which protrudes upward and has a cylindrical shape, is integrally provided on the edge of the opening of the bottom plate 51. The second closing portion 93 is located closer to the inner periphery of the piping cover 60 than the closing portion 92. A gap extending in the radial direction of the piping 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 ring-shaped cover main body 91. This makes it possible to obtain the same effects as those described above.

[0035] <Fourth Modification of Second Embodiment> As a fourth modification, it is also possible to employ the configuration shown in Fig. 7. In the example of Fig. 7, the space surrounded by the pipe cover 60 and the liquefied gas supply pipe 42 is filled with a heat insulating member 100. Specifically, a foamed resin such as a polyurethane resin is preferably used as the heat insulating member 100.

[0036] According to the above configuration, the space between the liquefied gas supply pipe 42 and the pipe cover 60 is filled with the heat insulating member 100. As a result, it is possible to prevent a gap containing air that is cooled by passing liquefied gas through the liquefied gas supply pipe 42 from being formed between the liquefied gas supply pipe 42 and the pipe cover 60. Furthermore, by filling the gap with the heat insulating member 100, it is possible to prevent the heat of the liquefied gas passing through the inside of the liquefied gas supply pipe 42 from being transferred to the outside of the pipe cover 60. Therefore, it is possible to prevent condensation of moisture from forming in the space between the liquefied gas supply pipe 42 and the pipe cover 60 and on the outside of the pipe cover 60.

[0037] Third Embodiment Next, a third embodiment of the present disclosure will be described with reference to Fig. 8. Note that the same components as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0038] As shown in Figure 8, the liquefied gas supply facility 2 according to this embodiment has a tank 20 and a tank-equipped rigging 30, similar to the first embodiment. The tank-equipped rigging 30 has a liquefied gas circulation section 31, a gas circulation section 32, and a protective cover 33. The liquefied gas circulation section 31 is connected to the tank 20 and has at least a liquefied gas supply pipe 42 that circulates liquefied gas within the tank 20. The protective cover 33 according to this third embodiment includes a cover main body 33A and a coaming 110. Similar to the protective cover 33 according to the first embodiment, the cover main body 33A has a bottom plate 51, a top plate 52, and side plates 53.

[0039] The coaming 110 extends from the tank 20 toward the bottom plate 51 to connect the tank 20 and the bottom plate 51. The coaming 110 covers the entire liquefied gas supply pipe 42 from the outside. That is, the coaming 110 covers the entire circumference of the liquefied gas supply pipe 42. The coaming 110 of this third embodiment has a first closing portion 111, a second closing portion 112, and a closing connection portion 113. The first closing portion 111 is cylindrical and extends downward from the underside of the bottom plate 51 toward the tank 20. The second closing portion 112 is cylindrical and extends upward from the outer surface of the tank 20 toward the bottom plate 51. The cross-sectional shapes of the first closing portion 111 and the second closing portion 112 may be, for example, circular or rectangular. The closing connection portion 113 is provided in each of the first closing portion 111 and the second closing portion 112. The blocking connection portions 113 are annular in shape and extend 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 so-called flanges, and the two blocking connection portions 113 are fixed to each other with bolts or the like while butting against each other vertically. Note that the method of connecting the first blocking portion 111 and the second blocking portion 112 is not limited to this; for example, the first blocking portion 111 and the second blocking portion 112 may be connected by welding. Alternatively, the blocking connection portions 113 may be annular in shape and extend inward from the lower edge of the first blocking portion 111 and the upper edge of the second blocking portion 112, respectively, and the two blocking connection portions 113 may be fixed to each other. The coaming 110 may also be configured to have a space inside which an operator can enter.

[0040] (Effects) According to the above configuration, the tank 20 undergoes thermal deformation, contraction, and expansion depending on the amount of liquefied gas stored therein. Therefore, the position of the liquefied gas supply pipe 42 connected to the tank 20 also changes due to the thermal deformation of the tank 20. However, the cover body 33A and the tank 20 are connected by the coaming 110, which completely covers the liquefied gas supply pipe 42. Even if the position of the liquefied gas supply pipe 42 connected to the tank 20 moves due to the thermal deformation of the tank 20, it can be moved within the coaming 110. This reduces the impact of movement of the liquefied gas supply pipe 42 caused by the contraction of the tank 20. Furthermore, the coaming 110 and the cover body 33A can protect the liquefied gas supply pipe 42 from the connection portion 61 with the tank 20 to the internal space of the cover body 33A. This further protects the portion through which liquefied gas flows between the surface of the tank 20 and the cover body 33A. Furthermore, the coaming 110 is provided so that workers can enter inside it, which facilitates maintenance.

[0041] 9 as a modification, it is also possible to employ a configuration in which a heat insulating member 120 is provided on the outer peripheral surface of the liquefied gas supply pipe 42. According to this configuration, the heat insulating member 120 is fixed in contact with and covers the outer peripheral surface of the liquefied gas supply pipe 42. This makes it possible to prevent the heat of the liquefied gas passing through the inside of the liquefied gas supply pipe 42 from being transferred to the outside of the liquefied gas supply pipe 42. This makes it possible to prevent condensation of moisture from occurring on the outside of the liquefied gas supply pipe 42.

[0042] Fourth Embodiment Next, a fourth embodiment of the present disclosure will be described with reference to Fig. 10. Note that the same components as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0043] 10 , in the liquefied gas supply facility 2 according to this embodiment, the protective cover 33 has a communication opening 130 that connects the inside with the outside, and a shielding portion 131 that covers the communication opening 130 to prevent the passage of liquid and allow the passage of gas. The communication opening 130 is mainly provided in the side plate 53 of the protective cover 33. A mesh member or a porous member is preferably used as the shielding portion 131.

[0044] (Effects) According to the above configuration, the shielding portion 131 covering the communication opening 130 allows gas to 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, the inside of the protective cover 33 can be ventilated by natural draft while preventing liquefied gas from being discharged to the outside of the protective cover 33 and rain from entering the inside of the protective cover 33.

[0045] <First Modification of Fourth Embodiment> A configuration shown in FIG. 11 can also be employed as a first modification. In the example shown in FIG. 11 , a shielding portion 140 is provided on both the inside and outside of the communication opening 130. Specifically, the shielding portion 140 includes a support 141 extending from the upper edge of the communication opening 130 to the inside and the outside, respectively, and a shielding portion main body 142 extending downward from the inside and the outside edges of the support 141, respectively. The shielding portion main body 142 covers the communication opening 130 and faces the lower wall surface of the communication opening 130 with a gap therebetween. Gas can circulate through this gap and the communication opening 130 itself. This configuration can also achieve the same effects as those described above.

[0046] <Second Modification of Fourth Embodiment> It is also possible to employ the configuration shown in Fig. 12 as a second modification. In the example shown in Fig. 12, the shielding portion 150 has a plurality of flange-shaped members 151. The flange-shaped members 151 are arranged at intervals in the vertical direction from the upper end to the lower end of the communication opening 130. Each flange-shaped member 151 has a C-shape that widens inward and outward as it extends from top to bottom. With this configuration, it is possible to obtain the same effects as those described above.

[0047] <Third Modification of Fourth Embodiment> It is also possible to employ the configuration shown in Fig. 13 as a third modification. In the example shown in Fig. 13, a communication opening 130 is formed in the top plate 52 of the protective cover 33. A shielding portion 160 covers this communication opening 130 from above, leaving a gap therebetween. The shielding portion 160 is fixed to the top plate 52 via a support member (not shown). With this configuration, it is possible to obtain the same effects as those described above.

[0048] Fifth Embodiment Next, a fifth embodiment of the present disclosure will be described with reference to Fig. 14. Note that the same components as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0049] As shown in FIG. 14 , the protective cover 33 according to this embodiment has a top plate 52 provided with multiple (for example, two) maintenance hatches 170 that communicate with the interior and allow various devices constituting the liquefied gas flow section 31 to pass through. The maintenance hatches 170 are normally closed. On the other hand, during maintenance, the doors can be opened to allow the internal devices to be carried out. A portable davit 171 (lifting weight device) capable of suspending heavy objects is provided near the maintenance hatch 170. This portable davit 171 can be attached or detached as needed. A scaffolding 172 is also provided near the maintenance hatch 170, allowing workers to access the top plate 52. A ladder 173 is provided at the end of the scaffolding 172 for climbing from the deck to the top plate 52.

[0050] According to the above configuration, while the portion through which liquefied gas flows is protected by the protective cover 33, maintenance can be performed on the liquefied gas flow section 31 inside the protective cover 33 via the maintenance hatch 170. Furthermore, it is also possible to carry out the devices that make up the liquefied gas flow section 31 vertically upward via the maintenance hatch 170. These features improve the maintainability of the liquefied gas supply facility 2.

[0051] Other Embodiments The above describes the embodiments of the present disclosure. It should be noted that various changes and modifications can be made to the above configurations without departing from the spirit and scope of the present disclosure. For example, in the above embodiments, an example has been described in which one pipe cover 60 is provided for one liquefied gas supply pipe 42. However, it is also possible to adopt a configuration in which one pipe cover 60 is provided for multiple pipes, including other pipes. Even in this case, the same effects as those described above can be obtained.

[0052] <Additional Notes> The liquefied gas supply system for a ship described in each embodiment can be understood, for example, as follows.

[0053] (1) The liquefied gas supply equipment 2 of the ship 1 in the first embodiment comprises a tank 20 arranged on the exposed deck of the hull 10 and capable of storing liquefied gas, and a tank-equipped outfit 30 arranged on the tank 20 and having a supply device in part for supplying the liquefied gas stored in the tank 20 to a consumer, and the tank-equipped outfit 30 comprises a liquefied gas circulation section 31 connected to the tank 20 and circulating the liquefied gas, a gas circulation section 32 that circulates vaporized gas obtained by vaporizing the liquefied gas, and a protective cover 33 formed in a box shape, accommodating the liquefied gas circulation section 31 inside and exposing the gas circulation section 32.

[0054] According to the above-described configuration, the portion through which the liquefied gas flows can be efficiently protected. Furthermore, since the portion can be efficiently protected, the amount of material required for the protective cover 33 can be reduced.

[0055] (2) The liquefied gas supply equipment 2 for the ship 1 in the second aspect is the liquefied gas supply equipment 2 for the ship 1 of (1), wherein the liquefied gas circulation section 31 is connected to the tank 20 and has a liquefied gas supply pipe 42 for circulating the liquefied gas in the tank 20, and the protective cover 33 is arranged on the tank 20 and comprises a bottom plate 51 having a through hole, a top plate 52 arranged opposite the bottom surface, a side plate 53 connecting the bottom surface and the top surface around the entire circumference, a pipe cover 60 connected on the tank 20, communicating with the space between the bottom surface and the top surface through the through hole, and covering the liquefied gas supply pipe 42 around the entire circumference, and a connection section 61 connecting the bottom plate 51 and the piping cover 60.

[0056] According to the above configuration, it is possible to further protect the portion through which the liquefied gas flows between the surface of the tank 20 and the protective cover 33.

[0057] (3) The liquefied gas supply equipment 2 for the ship 1 in the third aspect is the liquefied gas supply equipment 2 for the ship 1 of (2), and the connection portion 61 connects the piping cover 60 to the bottom plate 51 so that the piping cover 60 can move relative to the bottom plate 51.

[0058] According to the above configuration, the influence of the relative movement between the bottom plate 51 and the piping cover 60 caused by the contraction of the tank 20 can be suppressed.

[0059] (4) The liquefied gas supply equipment 2 of the ship 1 in the fourth aspect is the liquefied gas supply equipment 2 of the ship 1 of (2) or (3), and the tank-equipped equipment 30 is provided with an insulating member 100 filled in the space surrounded by the liquefied gas supply piping 42 and the piping cover 60.

[0060] According to the above configuration, it is possible to prevent condensation of moisture from occurring in the space formed between the liquefied gas supply pipe 42 and the pipe cover 60 and on the outside of the pipe cover 60 .

[0061] (5) The liquefied gas supply equipment 2 for the ship 1 in the fifth aspect is the liquefied gas supply equipment 2 for the ship 1 of (1) to (4), wherein the liquefied gas circulation section 31 is connected to the tank 20 and has a liquefied gas supply pipe 42 for circulating the liquefied gas in the tank 20, and the protective cover 33 has a cover body 33A fixed to the tank 20 and a coaming 110 that covers the entire circumference of the liquefied gas supply pipe 42 and extends from the tank 20 toward the cover body 33A to connect the tank 20 and the cover body 33A.

[0062] According to the above-described configuration, it is possible to further protect the portion through which the liquefied gas flows between the surface of the tank 20 and the protective cover 33. In addition, maintenance can be facilitated.

[0063] (6) The liquefied gas supply equipment 2 of the ship 1 in the sixth aspect is the liquefied gas supply equipment 2 of the ship 1 of (5), and is provided with an insulating member 120 that is fixed in contact with and covers the outer surface of the liquefied gas supply pipe 42.

[0064] According to the above configuration, condensation of water on the outside of the liquefied gas supply pipe 42 can be suppressed.

[0065] (7) The liquefied gas supply equipment 2 for a ship 1 in the seventh aspect is the liquefied gas supply equipment 2 for a ship 1 of (1) to (6), in which the protective cover 33 has a communication opening 130 that connects the inside with the outside, and a shielding portion 131 that covers the communication opening 130 to prevent the passage of liquid and allow gas to pass through.

[0066] According to the above configuration, the inside of the protective cover 33 can be ventilated by natural ventilation.

[0067] (8) The liquefied gas supply equipment 2 for the ship 1 in the eighth aspect is the liquefied gas supply equipment 2 for the ship 1 of (2) to (7), and the protective cover 33 is provided with a maintenance hatch 170 on the top plate 52 that is connected to the interior and through which devices that constitute the liquefied gas circulation section 31 can pass.

[0068] According to the above configuration, maintenance can be performed while the protective cover 33 protects the portion through which the liquefied gas flows.

[0069] (9) The ship 1 according to the ninth aspect is a ship 1 comprising a liquefied gas supply facility 2 as set forth in (1) to (8) and the hull 10 in which the liquefied gas supply facility 2 is arranged.

[0070] According to the above configuration, the parts of the ship 1 through which liquefied gas flows can be efficiently protected.

[0071] According to the liquefied gas supply equipment for a ship and the ship disclosed herein, the parts through which liquefied gas flows can be efficiently protected.

[0072] DESCRIPTION OF SYMBOLS 1 Ship 2 Liquefied gas supply device 10 Hull 11 Ship side 12 Ship bottom 13 Upper deck 20 Tank 30 Tank-equipped equipment 31 Liquefied gas circulation section 32 Gas circulation section 33 Protective cover 33A Cover body 41 Liquefied gas circulation section body 42 Liquefied gas supply piping 51 Bottom plate 52 Top plate 53 Side plate 60 Pipe cover 61 Connection section 62 Flange section 63 Bellows section 70 Flange section 71 Support section 72 Flange section body 81 Stay 82 Corrugated ring section 90 Ring-shaped cover 91 Ring-shaped cover body 92 Closure section 93 Second closure section 100 Heat insulating member 110 Coaming 111 First closure section 112 Second closure section 113 Closure connection section 120 Heat insulating member 130 Communication opening 131 Shielding portion 140 Shielding portion 141 Support 142 Shielding portion main body 150 Shielding portion 151 Flange-shaped member 160 Shielding portion 170 Maintenance hatch 171 Portable davit 172 Scaffolding 173 Ladder

Claims

1. A liquefied gas supply facility for a ship comprising: a tank arranged on the exposed deck of a ship's hull and capable of storing liquefied gas; and a tank-equipped outfitting arranged on the tank and having as part thereof a device for supplying the liquefied gas stored in the tank to a consumer, wherein the tank-equipped outfitting comprises: a liquefied gas circulation section that communicates with the tank and circulates the liquefied gas; a gas circulation section that circulates gas produced by vaporizing the liquefied gas; and a protective cover formed in a box shape that houses the liquefied gas circulation section inside and exposes the gas circulation section.

2. A liquefied gas supply facility for a ship as described in claim 1, wherein the liquefied gas circulation section has a liquefied gas supply pipe connected to the tank and circulating the liquefied gas within the tank, and the protective cover comprises: a bottom plate arranged on the tank and having a through hole through which the liquefied gas supply pipe is inserted; a top plate arranged opposite the bottom plate; side plates connecting the bottom plate and the top plate around the entire periphery; a piping cover connected to the tank, communicating with the space between the bottom plate and the top plate through the through hole and covering the liquefied gas supply pipe around the entire periphery; and a connecting section connecting the bottom plate and the piping cover.

3. A liquefied gas supply facility for a ship as described in claim 2, wherein the connection portion connects the piping cover to the bottom plate so that the piping cover can move relative to the bottom plate.

4. A liquefied gas supply facility for a ship as described in claim 2 or 3, wherein the tank-equipped equipment is provided with an insulating material filled in the space surrounded by the liquefied gas supply pipe and the pipe cover.

5. A liquefied gas supply facility for a ship as described in claim 1, wherein the liquefied gas circulation section has a liquefied gas supply pipe connected to the tank and circulating the liquefied gas within the tank, and the protective cover has a cover body fixed to the tank and a coaming that covers the entire periphery of the liquefied gas supply pipe and extends from the tank toward the cover body to connect the tank and the cover body.

6. A liquefied gas supply facility for a ship as described in claim 5, further comprising an insulating member fixed in contact with the outer periphery of the liquefied gas supply pipe so as to cover it.

7. A liquefied gas supply facility for a ship as described in claim 1 or 2, wherein the protective cover has a communication opening that connects the inside with the outside, and a shielding portion that covers the communication opening to prevent the passage of liquid while allowing gas to pass through.

8. A liquefied gas supply facility for a ship as described in claim 2, wherein the protective cover has a maintenance hatch on the top plate that communicates with the interior and through which devices constituting the liquefied gas circulation section can pass.

9. A ship comprising: a liquefied gas supply facility according to claim 1 or 2; and a hull in which the liquefied gas supply facility is disposed.

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