JP6654606B2 - Ship - Google Patents

Description

  The present invention relates to a ship.

  A liquefied gas carrier that transports a liquefied gas such as LNG (Liquefied Natural Gas) or LPG (Liquefied Petroleum Gas) often includes a plurality of cargo tanks for storing liquefied gas. In general, these tanks are arranged in a cargo-loading section (cargo hold) on the bow side of the upper structure in a row along the bow and tail direction.

The liquefied gas carrier is equipped with pumps, compressors, and other devices for taking liquefied gas into and out of the cargo tank, controlling the pressure in the cargo tank, reliquefying the boil-off gas, and the like. The equipment such as the pump and the compressor is housed in the equipment room.
Patent Literature 1 describes that an equipment room (machine room) is arranged together with a fuel tank in a cargo loading section of a carrier ship.

JP-T-2013-508202

The above-mentioned equipment room may be provided on the upper deck of the cargo loading section. In particular, when an independent spherical tank of the MOSS type or the like is provided, the space for installing the equipment room is limited because the upper part of the tank protrudes above the upper deck.
In order to increase the equipment accommodation space in the equipment room installed on the upper deck having such a limited space, there is a method of employing an equipment room having a plurality of layers above and below. However, as the number of levels in the equipment room increases, the height of the equipment room increases.

As the height of the equipment room increases, the required strength increases, and the weight of members constituting the equipment room increases. Further, as the height of the equipment room is increased, heavy objects such as compressors are spaced apart above the upper deck, which leads to a higher center of gravity of the liquefied gas carrier.
Also, in order to secure a space for arranging equipment, if a similar equipment room is formed, for example, on the other side, the space for arranging equipment increases, but a new support structure is required, The weight of the equipment room will increase significantly.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a ship capable of suppressing an increase in weight and a high center of gravity while securing a storage space in an equipment room.

The present invention employs the following means in order to solve the above problems.
According to the first aspect of the present invention, a ship is provided with a hull, a plurality of tanks arranged side by side in the fore-aft direction of the hull, and a tank having an upper part projecting from an upper deck of the hull, and And an equipment room having a plurality of layers which are arranged so as to be surrounded by a pair of adjacent tanks and a side of the hull in plan view, and which can accommodate equipment therein. The equipment room includes a lower tier located at the lowest of the plurality of tiers, and an upper tier provided above the lower tier. The lower story forms a first passage portion on the upper deck, which can move between the first side and the second side in the bow direction of the equipment room, and is disposed on the inner side in the boat width direction than the side of the ship. A passage wall. The upper story is at least partially arranged above the first passage portion.

  With this configuration, the device room has a plurality of levels, so that a space for housing the devices can be secured. Further, by forming the first passage portion in the lower level, it is possible to secure a passage while suppressing an increase in the height of the equipment room. In addition, by arranging at least a part of the upper floor above the first passage portion, it is possible to secure the accommodation space of the equipment room.

According to the second aspect of the present invention, the lower story according to the first aspect may be arranged between the upper deck and the upper deck with a gap in the vertical direction.
With this configuration, it is possible to provide a gap between the cargo loading section formed below the upper deck and the lower level of the equipment room.

According to the third aspect of the present invention, in the boat according to the second aspect, the lower story is such that the vertical dimension of the gap is greater than the vertical dimension of the first passage portion. You may make it formed so that it may become small.
With this configuration, the height dimension of the gap can be suppressed, and the first passage portion can be formed while suppressing the height of the equipment room.

According to the fourth aspect of the present invention, in the lower story according to any one of the first to third aspects, the passage wall portion is offset from the side of the ship with respect to the upper story inward in the boat width direction. The first passage portion may be formed so as to be continuous in the bow-stern direction between the side of the ship in the ship width direction and the passage wall portion of the lower level.
With such a configuration, the first passage portion can be formed between the passage wall portion on the lower level of the equipment room and the side of the ship.

According to the fifth aspect of the present invention, the lower story according to any one of the first to fourth aspects is arranged such that the lower level faces the tank provided on the first side in the bow and tail direction, and the first side A first tank-facing wall provided along the tank provided on the first side and forming a second passage portion on the upper deck between the tank provided on the first side and the bow-to-tail direction On the upper deck between the tank provided on the second side, facing the tank provided on the second side, and provided along the tank provided on the second side. A second tank-facing wall forming a third passage portion, wherein at least a part of the upper layer is disposed above at least one of the second passage portion and the third passage portion. Good.
With this configuration, the second passage portion and the third passage portion are provided between the tank provided on the first side and the second side in the bow and tail direction with respect to the equipment room and the lower level of the equipment room. Can be formed. In addition, the upper floor is at least partially disposed above at least one of the second passage portion and the third passage portion, so that a space for accommodating the equipment room can be secured.

According to a sixth aspect of the present invention, in the vessel according to any one of the first to fifth aspects, the upper story comprises an upper story outer wall facing outward in the ship width direction, and The outer surface of the wall may be arranged at the same position as the outer surface on the side of the ship in the boat width direction.
With this configuration, the upper floor of the equipment room can be provided as wide as possible on the side of the ship.

According to a seventh aspect of the present invention, the vessel according to any one of the first to sixth aspects is configured to open and close the outer surface of the upper floor and to carry in / out equipment accommodated in the equipment room. May be further provided.
With such a configuration, it is possible to easily carry in and out the equipment housed in the equipment room.

According to an eighth aspect of the present invention, the marine vessel according to the sixth aspect further includes an equipment entrance for opening and closing the outer surface of the upper level, for carrying in and out equipment housed in the equipment room. The equipment entrance may be provided on the outer surface of the upper floor outer wall of the outer surface.
With this configuration, the equipment loading / unloading entrance is provided on the upper floor outer wall facing outward in the boat width direction, so that loading / unloading of equipment into / from the equipment room can be performed from the side of the ship. This makes it possible to easily carry the equipment in and out of the equipment room, for example, by preventing interference with a tank or the like.

According to a ninth aspect of the present invention, in the marine vessel according to any one of the first to eighth aspects, the equipment room manages equipment for putting liquefied gas into and out of the tank, and pressure in the tank. At least one kind of equipment among equipment and equipment for reliquefying gas vaporized in the tank may be accommodated.
With this configuration, the equipment used for managing and operating the tank can be accommodated in the equipment room arranged between the tanks adjacent to each other.

  According to the above-mentioned marine vessel, an increase in weight and an increase in the center of gravity can be suppressed while securing a storage space for the equipment room.

It is a side view showing the whole composition of the vessel in one embodiment of the present invention. It is a top view which shows the whole structure of the said ship. It is sectional drawing when the equipment room provided in the said ship is seen along a bow and stern direction. It is a top view of the above-mentioned equipment room. It is sectional drawing which shows the structure of the modification of the equipment room provided in the said ship.

Hereinafter, a ship according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing the overall configuration of a ship in this embodiment. FIG. 2 is a plan view showing the overall configuration of the ship.
As shown in FIGS. 1 and 2, a ship 10 of this embodiment carries a liquefied gas such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG). The ship 10 includes at least a hull 11, an upper deck 12, a tank 13, an upper structure 17, and an equipment room 20.

  The hull 11 has a pair of side sides 14. The hull 11 includes a cargo loading section (hold) 15 between a pair of side sides 14 closer to the bow 11c than the upper structure 17 having a living quarter.

  The upper deck 12 is an entire exposed deck exposed to the outside, and is provided so as to cover above the cargo loading section 15. The above-described upper structure 17 is formed on the upper deck 12 on the stern 11d side of the cargo loading section 15.

  The tank 13 is made of, for example, an aluminum alloy and has a spherical shape. The tank 13 stores therein a liquefied gas to be transported. A plurality of tanks 13 are arranged in the cargo loading section 15 along a bow-sail direction Da connecting the bow 11c side and the stern 11d side of the hull 11. Each tank 13 is provided with its upper part 13 a protruding above the upper deck 12 of the hull 11. Although the case where the tank 13 is spherical is illustrated, the tank 13 is not limited to a spherical shape. The tank 13 may have, for example, a cylindrical shape or a conical cylindrical shape having a constant diameter at the middle part in the vertical direction, and a semi-spherical shape at the top and bottom, and a vertical cross-sectional shape that is long in the vertical direction.

  Each tank 13 is provided with a tank cover 16. The tank cover 16 is provided on the upper deck 12 of the hull 11. The tank cover 16 includes a rising portion 16a and a top plate 16b. The rising portion 16a is formed so as to rise upward from the upper deck 12. Further, the rising portions 16a are formed so as to surround the entire circumference of the tank 13 at intervals on the radial outside of the tank 13 in plan view (see FIG. 2). The top plate part 16b is provided on the rising part 16a, and is formed, for example, in a spherical shape so as to cover the upper part of the tank 13.

  The equipment room 20 includes, for example, a pump for putting liquefied gas into and out of the tank 13, a pressure gauge and a compressor for managing the pressure in the tank 13, and a device such as a reliquefaction device for reliquefying the gas vaporized in the tank 13. At least one of them is housed. This equipment room 20 is arranged on the upper deck 12. More specifically, the equipment room 20 is disposed so as to be surrounded by the adjacent tanks 13A and 13B and the side of the ship 14 in plan view.

FIG. 3 is a cross-sectional view of the equipment room provided on the boat when viewed along the bow and tail direction. FIG. 4 is a plan view of the equipment room.
As shown in FIG. 3, the equipment room 20 has a plurality of floors vertically divided by a plurality of floor boards 25 provided at intervals in the up-down direction. The equipment room 20 includes an upper floor 21, a lower floor 22, and a passage 24.

  As shown in FIG. 4, the equipment room 20 includes an end portion 20 a (corresponding to an upper-floor outer wall 29 </ b> A described later) extending outward in the ship width direction Dw in the bow and tail direction Da when viewed in plan. The equipment room 20 is formed so that the length of the bow direction Da is gradually reduced from the length L1 of the end portion 20a on the inner side of the end portion 20a in the ship width direction Dw. The case where the equipment room 20 in this embodiment is formed such that the end 20b inside the boat width direction Dw extends in the bow and tail direction Da in plan view. However, the plan view shape of the equipment room 20 is not limited to this shape. For example, the equipment room 20 may have a triangular shape in a plan view that tapers from the outside to the inside in the boat width direction Dw.

  As shown in FIG. 3, the upper story 21 is arranged to be spaced upward from the upper deck 12. In this embodiment, the upper layer 21 has a first upper layer 21A provided immediately above the lower layer 22 and a second upper layer 21B provided above the first upper layer 21A. Here, the upper layer 21 may have at least one layer, and may have only one layer or three or more layers in addition to the two layers as in this embodiment.

The lower hierarchy 22 is located at the lowest of the plurality of hierarchies. The lower hierarchy 22 is arranged below the upper hierarchy 21. The lower layer 22 in this embodiment has a case where the plane area is smaller than the upper layer 21 (first upper layer 21A, second upper layer 21B), but the plane area of the lower layer 22 is smaller than that of the upper layer 21. The area may be equal to or larger than the plane area of the upper layer 21.
The lower story 22 is arranged between the upper deck 12 and the upper deck 12 with a gap 23 in the vertical direction. The gap 23 may be a closed space isolated from the outside, or may be an exposure space having an opening in any direction in which the upper surface of the upper deck 12 expands.

As shown in FIG. 4, the lower story 22 mainly includes a passage wall 26, a first tank facing wall 27, and a second tank facing wall 28.
The passage wall 26 extends upward from the upper deck 12. The passage wall 26 in this embodiment is formed substantially in parallel with the outer surface 14s of the upper edge 14t of the side of the shore 14. As shown in FIGS. 3 and 4, the passage wall portion 26 is provided to be offset from the shore 14 to the inside of the ship width direction Dw with respect to the upper floor outer wall 29A facing the ship width direction Dw outside in the upper story 21. I have. Here, the outer surface 29s of the upper floor outer wall 29A is the same in the ship width direction Dw as the outer surface 14s of the upper edge 14t of the shore side 14, that is, provided vertically above the outer surface 14s.

As shown in FIG. 4, the first tank facing wall 27 faces the tank cover 16 of the tank 13A provided on the bow 11c side (the right side in FIG. 4), which is the first side in the bow direction Da. The first tank facing wall 27 is formed along the tank cover 16 (more specifically, the rising portion 16a) of the tank 13A provided on the bow 11c side. The first tank opposing wall 27 is offset more toward the stern 11d side (left side in FIG. 4), which is the second side in the bow-sail direction Da, than the opposing wall 29B opposing the tank 13A in the upper story 21. Thereby, the first tank facing wall 27 is horizontally spaced from the tank 13A and the rising portion 16a of the tank cover 16.
Here, the first tank facing wall 27 exemplified in this embodiment is bent (knuckled) so that the intermediate portion 27c is depressed inward of the equipment room 20.

The second tank facing wall 28 faces the tank cover 16 of the tank 13B provided on the stern 11d side (right side in FIG. 4). The second tank facing wall 28 is provided along the tank cover 16 (more specifically, the rising portion 16a) of the tank 13B provided on the stern 11d side. The second tank facing wall 28 is offset closer to the bow 11c (leftward in FIG. 4) than the facing wall 29C facing the tank 13B in the upper story 21. Thereby, the second tank facing wall 28 is horizontally spaced from the tank 13B and the rising portion 16a of the tank cover 16.
Here, similarly to the first tank opposing wall 27, the second tank opposing wall 28 exemplified in this embodiment is bent (knuckled) so that the intermediate portion 28c is depressed inward of the equipment room 20. ing.

The passage portion 24 has a side passage portion (first passage portion) 24A, a tank-side first passage portion (second passage portion) 24B, and a tank-side second passage portion (third passage portion) 24C.
The side passage 24A is formed on the upper deck 12 so as to be continuous in the bow-and-sail direction Da between the side 14 and the passage wall 26 of the lower floor 22. The side passage portion 24 </ b> A is formed by at least the upper deck 12 and the passage wall portion 26 of the lower story 22. The height H2 in the vertical direction of the side passage portion 24A is larger than the height H1 in the vertical direction of the gap 23. The side passage portion 24A in this embodiment is disposed below a floor plate 25 of the first upper floor 21A which projects outward from the passage wall portion 26 in the ship width direction Dw. However, what is arranged above the side passage part 24A is not limited to the floor plate 25 of the first upper floor 21A. For example, the ceiling (not shown) of the lower floor 22 may be disposed above the side passage 24A, or the floor plate 25 of the second upper floor 21B may be disposed.

According to the side passage portion 24A, on the upper deck 12, the end 20c of the equipment room 20 on the bow 11c side and the end 20d on the stern 11d side communicate with each other. The crew of the vessel 10 can pass between the end 20c on the bow 11c side and the end 20d on the stern 11d side of the equipment room 20 by passing through the thus formed side passage portion 24A.
In other words, the lower story 22 forms a side passage portion 24 </ b> A on the upper deck 12 that can move between the first side and the second side in the bow direction Da of the equipment room 20. It has a passage wall 26 arranged inside.

  The tank-side first passage portion 24B is formed between the first tank facing wall 27 and the tank 13A provided on the bow 11c side. A portion of the tank-side first passage portion 24B is located below the upper story 21 that projects toward the tank 13A from the first tank facing wall 27 of the lower story 22.

  The tank-side second passage portion 24C is formed between the second tank facing wall 28 and the tank 13B provided on the stern 11d side. A part of the tank-side second passage portion 24C is located below the upper story 21 which projects toward the tank 13B from the second tank facing wall 28 of the lower story 22.

  By passing through the tank-side first passage portion 24B and the tank-side second passage portion 24C, the crew of the boat 10 moves between the end 20c of the equipment room 20 on the bow 11c side and the end 20d on the stern 11d side. It becomes possible. That is, the tank-side first passage portion 24B and the tank-side second passage portion 24C of the passage portion 24 connect the end 20c of the equipment room 20 on the bow 11c side and the end 20d of the stern 11d side on the upper deck 12. Communicating.

  The equipment room 20 includes a pump for putting liquefied gas into and out of the tank 13, a pressure gauge for controlling the pressure in the tank 13, a compressor, and a gas that is vaporized in the tank 13 in the upper layer 21 and the lower layer 22. A device such as a reliquefaction device to be operated is housed.

  Therefore, according to the vessel 10 of the above-described embodiment, the space for accommodating the equipment can be secured by making the equipment room 20 have a plurality of levels. In addition, by forming the side passage portion 24A in the lower story 22, it is possible to secure a passage while suppressing an increase in the height of the equipment room 20. By arranging at least a part of the upper story 21 above the side passage 24A, a space for accommodating the equipment room 20 can be secured. As a result, it is possible to suppress the increase in the center of gravity while securing the accommodation space of the equipment room 20.

  The lower story 22 is arranged between the upper deck 12 and the upper deck 12 with a gap 23 in the vertical direction. Thereby, a space can be formed between the cargo loading section 15 formed below the upper deck 12 and the lower floor 22 of the equipment room 20.

  Further, the vertical dimension H1 of the gap 23 in the equipment room 20 is smaller than the vertical dimension H2 of the passage section 24. With this configuration, the height dimension H1 of the gap 23 can be suppressed, and the side passage portion 24A can be formed while the height of the equipment room 20 is suppressed.

  In the lower story 22, the passage wall 26 is provided to be offset from the side of the boat 14 inward in the boat width direction Dw with respect to the upper story 21. With such a configuration, a side passage portion 24 </ b> A can be formed between the passage wall portion 26 of the lower floor 22 of the equipment room 20 and the shore side 14.

  Further, tanks 13A and 13B provided on the first side and the second side in the bow direction Da with respect to the equipment room 20, and the first tank facing wall 27 and the second tank facing wall 28 of the lower level 22 of the equipment room 20 are provided. A tank-side first passage portion 24B and a tank-side second passage portion 24C are formed between the first and second passages. Further, at least a part of the upper story 21 is disposed above the tank-side first passage portion 24B and the tank-side second passage portion 24C. Therefore, the accommodation space of the equipment room 20 can be secured while forming the tank-side first passage portion 24B and the tank-side second passage portion 24C.

  The upper story 21 includes an upper floor outer wall 29A facing outward in the ship width direction Dw, and an outer surface 29s of the upper floor outer wall 29A is disposed at the same position as an outer surface 14s of the upper edge 14t of the side of the boat 14 in the ship width direction Dw. ing. With this configuration, the upper floor 21 of the equipment room 20 can be provided as wide as possible on the side of the ship 14.

  In addition, the equipment room 20 houses at least one of equipment for putting liquefied gas into and out of the tank 13, equipment for managing the pressure in the tank 13, and equipment for reliquefying the gas vaporized in the tank 13. . With this configuration, devices used for managing and operating the tank 13 can be accommodated in the device room 20 disposed between the tanks 13 adjacent to each other.

(Modification of Embodiment)
FIG. 5 is a cross-sectional view illustrating a configuration of a first modification of the equipment room provided in the ship.
As shown in FIG. 5, a device for opening and closing the upper floor 21, for example, the outer surface 29 s of the upper floor outer wall (outer surface) 29 </ b> A of the first upper floor 21 </ b> A, for loading and unloading the device housed in the equipment room 20. The carry-in / out entrance 30 may be provided. The device entrance 30 has a door 31 that can be opened and closed.

  In such an equipment room 20, the equipment accommodated in the first upper floor 21A can be taken in and out through the equipment entrance 30. Here, the first upper floor 21A may be provided with, for example, an overhead crane 33 or the like. By making the rails 34 of the overhead crane 33 project outward from the equipment entrance 30, the equipment accommodated in the equipment room 20 can be carried in and out through the equipment entrance 30.

According to the above-described configuration, the equipment entrance 30 is formed in the upper floor outer wall 29A of the first upper floor 21A. In particular, as shown in FIG. 5, when the equipment room 20 has three layers up and down, in the first upper layer 21A located at the middle part in the vertical direction, equipment is placed from above or below. Difficult to get in and out. Therefore, by providing the equipment loading / unloading entrance 30 in the first upper level 21A, loading / unloading of the equipment can be easily performed.
Also, by providing the equipment entrance 30 on the upper floor outer wall 29A facing the outside in the boat width direction Dw, it is possible to carry the equipment in and out of the equipment room 20 from the side of the side of the ship 14. This makes it possible to easily carry the equipment in and out of the equipment room 20 while preventing interference with the tank 13 and the like.

In this modification, the device entrance / exit 30 is formed on the upper floor outer wall 29A. However, the first tank facing wall 27 and the second tank facing wall other than the upper floor outer wall 29A of the upper level 21 are provided. 28 or the like.
Furthermore, the equipment entrance 30 may be provided not only in the first upper floor 21A but also in the second upper floor 21B.

(Other modifications)
The present invention is not limited to the above-described embodiment, and includes various modifications of the above-described embodiment without departing from the spirit of the present invention. That is, the specific shape, configuration, and the like described in the embodiment are merely examples, and can be appropriately changed.
For example, the passage portion 24 may be formed so as to penetrate the lower floor 22 of the equipment room 20 so that the equipment room 20 communicates with the end 20c on the bow 11c side and the end 20d on the stern 11d side.
The plane shape of the equipment room 20 may be any plane shape as long as a required accommodation space can be ensured while being arranged in the gap between the side of the ship 14 and the tanks 13A and 13B.
Further, although the equipment room 20 has a configuration having three layers above and below, it is needless to say that only two layers or four or more layers may be provided.

Furthermore, in the above-described embodiment, the case where the side passage portion 24A is formed in a straight line extending in the bow-and-sail direction Da is illustrated. However, the side passage portion 24A is only required to be able to communicate between the first side and the second side in the bow and tail direction Da, and is not limited to a straight line extending in the bow and tail direction Da.
Further, the case where the side passage portion 24A is opened to the outside in the ship width direction Dw is illustrated, but the outside of the ship side direction passage 24D in the ship width direction Dw may be closed by a part of the lower story 22.

  Further, in the above-described embodiment, the case where the equipment room 20 is disposed on the upper deck 12 surrounded by the two tanks 13 and the side of the ship near the upper structure 17 has been described, but the present invention is limited to this arrangement. Absent. For example, it may be arranged on the upper deck 12 surrounded by the other two tanks 13 and the shore 14.

DESCRIPTION OF SYMBOLS 10 Ship 11 Hull 11c Bow 11d Stern 12 Upper deck 13 Tank 13A Tank 13B Tank 13a Upper part 14 Sideboard side 14s Outer surface 14t Upper edge 15 Cargo loading section 16 Tank cover 16a Rising part 16b Top plate part 17 Upper structure 20 Equipment room 20a End part 20b End 20c End 20d End 21 Upper Level 21A First Upper Level 21B Second Upper Level 22 Lower Level 23 Gap 24 Passage 24A Portside Passage (First Passage)
24B Tank side first passage (second passage)
24C tank side second passage (third passage)
25 Floor plate 26 Passage wall 27 First tank facing wall 27c Intermediate portion 28 Second tank facing wall 28c Intermediate portion 29A Upper outer wall (outer surface)
29B Opposite wall 29C Opposite wall 29s Outer surface 30 Equipment entrance 31 Door 33 Overhead crane 34 Rail Da Bow direction Dw Ship width direction H1, H2 Height dimensions

Claims (9)

The hull and
A plurality of tanks arranged side by side in the fore-aft direction of the hull, the upper part of which protrudes from the upper deck of the hull;
A device room having a plurality of layers which are arranged on the upper deck, are arranged so as to be surrounded by a pair of adjacent tanks and the side of the hull in plan view, and can accommodate equipment therein. ,
The equipment room,
A lower layer located at the bottom of the plurality of layers;
An upper layer provided above the lower layer,
The lower floor forms a first passage portion on the upper deck, which is capable of moving between the first side and the second side in the bow direction of the equipment room, and is disposed on the inner side in the boat width direction than the shore side. Equipped with a passage wall
The above-mentioned upper story is a vessel in which at least one copy is arranged above the 1st passage part.   The ship according to claim 1, wherein the lower story is disposed between the upper deck and the upper deck with a gap in a vertical direction. The lower hierarchy is
The marine vessel according to claim 2, wherein the vertical dimension of the gap is smaller than the vertical dimension of the first passage portion. The lower hierarchy is
The passage wall portion,
With respect to the upper floor, provided offset from the side of the ship inward in the ship width direction,
4. The first passage portion according to claim 1, wherein the first passage portion is formed so as to be continuous in the bow-stern direction between the side of the ship in the ship width direction and the passage wall portion of the lower level. 5. Ships. The lower hierarchy is
The tank is provided along the tank provided on the first side, facing the tank provided on the first side in the bow direction, and between the tank provided on the first side. A first tank facing wall forming a second passage on the upper deck,
Opposed to the tank provided on the second side in the bow direction, provided along the tank provided on the second side, between the tank provided on the second side A second tank facing wall forming a third passage portion on the upper deck,
The upper hierarchy,
The ship according to any one of claims 1 to 4, wherein at least a part thereof is disposed above at least one of the second passage portion and the third passage portion. The upper hierarchy,
An upper floor outer wall facing the outside in the boat width direction,
The ship according to any one of claims 1 to 5, wherein an outer surface of the upper floor outer wall is arranged at the same position as an outer surface on the side of the ship in a ship width direction.   The marine vessel according to any one of claims 1 to 6, further comprising an equipment entrance which is opened on an outer side surface of the upper floor and through which equipment accommodated in the equipment room is carried in and out. Further comprising a device entrance for opening and closing the outer surface of the upper level, for carrying in and out the devices accommodated in the device room,
The equipment entrance / exit,
The marine vessel according to claim 6, wherein the outer surface is provided on an outer surface of the upper floor outer wall.   The equipment room houses at least one type of equipment among equipment for putting liquefied gas into and out of the tank, equipment for managing pressure in the tank, and equipment for reliquefying gas vaporized in the tank. The ship according to any one of claims 1 to 8.

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