Liquefied gas transport vessel

Abstract

A liquefied gas transport vessel according to one embodiment of the present disclosure includes: an engine room positioned at a stern section, which is behind a cargo compartment that stores liquefied gas; a stern facility positioned at the stern section, outside the engine room; a bow facility positioned at a bow section, which is in front of the cargo compartment; an under deck passage extending in a front-rear direction, below an upper deck of the cargo compartment; an independent zone that is independent from the engine room, and includes a cargo compartment side opening that opens to the under deck passage and a stern section side opening that opens to a stern upper area on the upper deck of the stern section; and an electric cable connecting the bow facility and the stern facility, passing through the under deck passage, the independent zone, and the stern upper area.

Description

liquefied gas carrier

[0001] The present disclosure relates to liquefied gas carriers.

[0002] The following Patent Document 1 discloses a liquefied gas carrier in which a signal cable and a power cable pass over the surface of a tank cover.

[0003] JP 2023-087286 A

[0004] Some liquefied gas carriers are equipped with underdeck passages, which are passages extending in the fore-and-aft direction below the upper deck of the cargo area. Laying electrical cables, such as signal cables and power cables, in these underdeck passages makes it easy to lay the cables.

[0005] However, when laying an electric cable in an underdeck passage, the location of the electric cable entrance / exit at the rear becomes an issue. That is, since the engine room is located aft of the underdeck passage, if the electric cable entrance / exit is provided at the aft end of the underdeck passage, the electric cable would have to pass through the engine room. In this case, if a fire breaks out in the engine room, the electric cable would be damaged and become unusable. Therefore, for example, an emergency electric cable to be used in the event of an engine room fire must be a fire-resistant cable, which increases the cost of laying the electric cable. On the other hand, it is also possible to form the electric cable entrance / exit at the upper rear of the underdeck passage. However, with this configuration, there is a risk that flammable gas may flow into the underdeck passage from near the upper deck of the cargo area through the electric cable entrance / exit.

[0006] Therefore, an object of the present disclosure is to provide a liquefied gas carrier on which electrical cables can be laid easily and at low cost.

[0007] A liquefied gas carrier according to one embodiment of the present disclosure comprises an engine room located in the stern section aft of the cargo section which stores liquefied gas, stern equipment located outside the engine room in the stern section, bow equipment located in the bow section forward of the cargo section, an under-deck passage extending in the fore-and-aft direction below the upper deck of the cargo section, an independent compartment which is independent from the engine room and includes a cargo section side entrance which opens into the under-deck passage and a stern side entrance which opens into an aft area on the upper deck of the aft section, and an electric cable which connects the bow equipment and the stern equipment via the under-deck passage, the independent compartment, and the aft area.

[0008] According to a liquefied gas carrier according to one aspect of the present disclosure, electrical cables can be laid easily and at low cost.

[0009] Fig. 1 is a side view of a liquefied gas carrier. Fig. 2 is a side view of the stern area of ​​the liquefied gas carrier. Fig. 3 is a plan view of the stern area of ​​the liquefied gas carrier. Fig. 4 is a cross-sectional view of an independent compartment.

[0010] (Outline of Liquefied Gas Carrier) A liquefied gas carrier 100 according to an embodiment will be described below. First, an outline of the liquefied gas carrier 100 according to this embodiment will be described. FIG. 1 is a side view of the liquefied gas carrier 100. In this embodiment, the front, rear, right, and left as viewed from a passenger facing the propulsion direction of the liquefied gas carrier 100 (to the right on the page in FIG. 1 ) are simply referred to as the "front," "rear," "right," and "left," respectively. Furthermore, the direction along the front and rear is referred to as the "fore-and-aft direction," and the direction along the right and left is referred to as the "width direction."

[0011] The liquefied gas carrier 100 according to this embodiment is a ship that transports liquefied gas such as liquefied hydrogen or liquefied natural gas. As shown in Fig. 1, the liquefied gas carrier 100 can be divided into a cargo section 10, a bow section 20, and a stern section 30. An electric cable 40 is also installed on the liquefied gas carrier 100.

[0012] <Cargo section> The cargo section 10 includes a central portion in the longitudinal direction of the liquefied gas carrier 100 and is an area for storing liquefied gas. The liquefied gas carrier 100 according to this embodiment includes a liquefied gas tank 11 and an underdeck passage 12, each located in the cargo section 10.

[0013] The liquefied gas tanks 11 are tanks for storing liquefied gas. The liquefied gas carrier 100 of this embodiment is equipped with four liquefied gas tanks 11, but the number of liquefied gas tanks 11 equipped on the liquefied gas carrier 100 is not limited.

[0014] The under-deck passage 12 is a passage that extends in the fore-and-aft direction below the upper deck 50 of the cargo section 10. The under-deck passage 12 extends from the forward end to the aft end of the cargo section 10. The aft end of the under-deck passage 12 may be aligned in the fore-and-aft direction with the forward end of the engine room 31, which will be described later, or may be located aft of the forward end of the engine room 31. The under-deck passage 12 is located at both ends in the width direction of the cargo section 10 (see FIG. 3). The under-deck passage 12 is used as a passage for workers to move between the bow section 20 and the stern section 30, which will be described later.

[0015] <Bow section> The bow section 20 corresponds to the front part of the liquefied gas carrier 100, and is an area located forward of the cargo section 10. The liquefied gas carrier 100 according to this embodiment is equipped with a bow fixture 21 located in the bow section 20.

[0016] The bow equipment 21 in this embodiment is installed within the bow structure 22. The bow structure 22 includes, for example, an accommodation area where passengers live and work, and a wheelhouse where the operator steers the ship. The bow equipment 21 is, for example, a steering device, and the bow equipment 21 consumes power and transmits control signals. Note that the bow equipment 21 only needs to be located in the bow section 20, and does not have to be installed within the bow structure 22. Note that the bow equipment 21 may be made up of multiple pieces of equipment.

[0017] <Stern Section> The stern section 30 corresponds to the rear part of the liquefied gas carrier 100, and is an area located rearward of the cargo section 10. Figure 2 is a side view of the liquefied gas carrier 100 near the stern section 30.

[0018] As shown in Figure 2, the liquefied gas carrier 100 of this embodiment has an engine room 31, stern equipment 32, a cargo machinery room 33, a mooring line area 34, and an independent compartment 35, each located in the stern section 30.

[0019] The engine room 31 is a room where a propulsion engine 51 is installed. The propulsion engine 51 is an engine for generating power to propel the liquefied gas carrier 100.

[0020] The stern equipment 32 is equipment located outside the engine room 31 in the stern section 30. The stern equipment 32 in this embodiment includes a steering gear 53 and an emergency generator 54. The steering gear 53 is a device that adjusts the propulsion direction of the liquefied gas carrier 100, for example, by rotating a rudder blade 55. The steering gear 53 in this embodiment is located in a steering gear room 56 located aft of the engine room 31. The emergency generator 54 is a device that generates electricity in an emergency. The emergency generator 54 in this embodiment is located in an emergency generator room 57 located above the upper deck 50.

[0021] The cargo machinery room 33 is a room in which cargo machinery 58 that handles liquefied gas or vaporized gas is located. The cargo machinery 58 includes, for example, a cargo compressor, a cargo pump, and a cargo process unit. The cargo machinery room 33 is located above the upper deck 50 of the stern section 30. In this embodiment, a space is formed between the cargo machinery room 33 and the upper deck 50. Furthermore, the cargo machinery room 33 in this embodiment is located in a part of the stern section 30 closer to the cargo section 10.

[0022] The mooring line area 34 is located on the upper deck 50 of the stern section 30, and is an area through which mooring lines 59 (see FIG. 3) pass. In this embodiment, the mooring line area 34 is located below the cargo machinery room 33. That is, the mooring line area 34 is located in the space formed between the cargo machinery room 33 and the upper deck 50. FIG. 3 is a plan view of the vicinity of the stern section 30 of the liquefied gas carrier 100. However, the cargo machinery room 33 described above is omitted from FIG. 3. As shown in FIG. 3, a mooring machine 60 is located in the mooring line area 34, and mooring lines 59 extend outward in the width direction from this mooring machine 60. In this embodiment, the mooring line area 34 is located forward of the stern equipment 32.

[0023] The independent compartment 35 is a compartment independent from the engine room 31. The shaded area in Figures 1 to 3 indicates the independent compartment 35. The independent compartment 35 being independent from the engine room 31 means that the independent compartment 35 and the engine room 31 are separated by an appropriate fireproof structure. Furthermore, an example of an "appropriate fireproof structure" is a structure equipped with an "A-0" class partition required by Part R of the NK Rules. As shown in Figure 2, the independent compartment 35 is located at the forward end of the stern section 30 near the upper deck 50. Furthermore, the independent compartment 35 is located below the mooring line area 34. Note that, although the entire independent compartment 35 in this embodiment is located below the upper deck 50, it is sufficient that at least a portion of the independent compartment 35 is located below the upper deck 50.

[0024] 3, the independent compartment 35 is located near the end in the width direction of the stern section 30. In this embodiment, the independent compartment 35 is located near the right end of the stern section 30. However, the independent compartment 35 may be located near the left end of the stern section 30, or may be located near both the right end and the left end of the stern section 30.

[0025] Fig. 4 is a cross-sectional view of the independent compartment 35. More precisely, Fig. 4 is a cross-sectional view of the independent compartment 35 taken perpendicular to the width direction, as viewed from the right. As shown in Fig. 4, the independent compartment 35 includes a cargo section side opening 61 and an aft section side opening 62.

[0026] The cargo section side entrance 61 opens into the underdeck passage 12. The size of the cargo section side entrance 61 is not limited, and it may be large enough for workers to pass through. An opening and closing door may be installed at the cargo section side entrance 61. Furthermore, the cargo section side entrance 61 may be formed with a penetrating material for passing the electric cable 40 described below, and may be constructed so that no gap is created between the cargo section side entrance 61 and the electric cable 40. Note that if only the lower portion of the independent compartment 35 is located below the upper deck 50, the cargo section side entrance 61 is formed in that lower portion.

[0027] The stern side opening 62 opens into an upper stern area 63, which is a space above the upper deck 50 of the stern section 30. In this embodiment, the stern side opening 62 opens upward. However, if the upper portion of the independent compartment 35 is located above the upper deck 50, the stern side opening 62 may be formed in that upper portion, opening, for example, rearward. Furthermore, the stern side opening 62 is located outside the mooring line area 34. More specifically, the stern side opening 62 is located rearward of the mooring line area 34. The stern side opening 62 may be formed of a penetrating material that allows the electric cable 40, described below, to pass through, and may be constructed so that no gap is created between the stern side opening 62 and the electric cable 40.

[0028] <Electric Cable> The electric cable 40 is a cable that connects the bow equipment 21 and the stern equipment 32. As shown in Fig. 1 , the electric cable 40 of this embodiment includes a signal cable 41 that transmits signals and a power cable 42 that transmits electricity. The signal cable 41 of this embodiment transmits, for example, a signal output from the bow equipment 21 to the steering gear 53 of the stern equipment 32. Furthermore, the power cable 42 of this embodiment transmits, for example, electricity output from the emergency generator 54 of the stern equipment 32 to the bow equipment 21.

[0029] 1, in this embodiment, the electric cable 40 is laid in the under-deck passage 12. In this way, in this embodiment, the electric cable 40 is laid using the under-deck passage 12, which is a passage for workers, so there is no need to form a new passage for laying the electric cable 40, and the electric cable 40 can be easily laid.

[0030] 2, in this embodiment, the electric cable 40 passes through the under-deck passage 12, the independent compartment 35, and the aft area 63. Specifically, the signal cable 41 passes through the under-deck passage 12, the independent compartment 35, and the aft area 63 in this order from the front side, enters the steering gear room 56, and is connected to the steering gear 53. The power cable 42 passes through the under-deck passage 12, the independent compartment 35, and the aft area 63 in this order from the front side, enters the emergency generator room 57, and is connected to the emergency generator 54.

[0031] As described above, according to this embodiment, the electric cable 40 can be laid without passing through the engine room 31. Therefore, it is not necessary to use a fire-resistant cable for the electric cable 40, and an inexpensive cable can be used for the entire length of the electric cable 40. In other words, the electric cable 40 can be laid at low cost.

[0032] 4 , in this embodiment, the electric cable 40 passes through the cargo section side opening 61 and the stern section side opening 62 of the independent compartment 35. That is, the cargo section side opening 61 and the stern section side opening 62 function as entrances and exits for the electric cable 40 in the independent compartment 35. The cargo section side opening 61, which is the entrance and exit for the electric cable 40 in the independent compartment 35, is located outside the mooring rope area 34. Therefore, in this embodiment, the electric cable 40 can be laid without passing through the mooring rope area 34, which prevents the electric cable 40 from being damaged by the mooring ropes 59.

[0033] The electric cable 40 also includes a plurality of partial electric cables 43 connected in the extending direction. That is, the electric cable 40 is formed by connecting a plurality of partial electric cables 43. The signal cable 41 is formed by connecting a plurality of partial signal cables 44 corresponding to the partial electric cables 43. The power cable 42 is formed by connecting a plurality of partial power cables 45 corresponding to the partial electric cables 43. However, the electric cable 40 may be formed from a single cable.

[0034] In this embodiment, the partial electric cables 43 are not connected within the underdeck passage 12, but are connected within the independent compartment 35. Furthermore, the partial electric cables 43 are connected to each other by the cable junction box 46. That is, in this embodiment, the cable junction box 46 is located in the independent compartment 35. In this way, by installing the cable junction box 46 in the independent compartment 35, into which flammable gas is less likely to flow, there is no need to make the cable junction box 46 explosion-proof, and the electric cables 40 can be laid at low cost.

[0035] (Summary) The first item disclosed in this specification is a liquefied gas carrier comprising: an engine room located in the stern section aft of the cargo section which stores liquefied gas; stern equipment located outside the engine room in the stern section; bow equipment located in the bow section forward of the cargo section; an under-deck passage extending in the fore-and-aft direction below the upper deck of the cargo section; an independent compartment which is independent from the engine room and includes a cargo section side entrance which opens into the under-deck passage and an aft section side entrance which opens into an aft area on the upper deck of the aft section; and an electric cable which connects the bow equipment and the aft equipment via the under-deck passage, the independent compartment, and the aft area.

[0036] According to this configuration, the electric cable can be laid easily because it is laid using the underdeck passage where workers pass through. Also, according to this configuration, the electric cable can be laid without passing through the engine room, so there is no need to use a fire-resistant cable for the electric cable, and the electric cable can be laid at low cost.

[0037] A second item disclosed in this specification is a liquefied gas carrier according to the first item, wherein the electric cable includes a plurality of partial electric cables connected in the extension direction, and further comprises a cable connection box located in the independent compartment and connecting the partial electric cables to each other.

[0038] According to this configuration, it is not necessary to make the cable junction box explosion-proof, and the electric cable can be laid at low cost.

[0039] The third item disclosed in this specification is a liquefied gas carrier described in the first or second item, further comprising a mooring line area located on the upper deck of the stern section through which mooring lines pass, the independent compartment being located below the mooring line area, and the stern side opening of the independent compartment being located outside the mooring line area.

[0040] According to this configuration, the electric cable can be laid without passing through the mooring rope area, thereby preventing the electric cable from being damaged by the mooring rope.

[0041] A fourth item disclosed in this specification is a liquefied gas carrier described in any one of the first to third items, in which at least a portion of the independent compartment is located below the upper deck.

[0042] This configuration makes it possible to easily form a cargo section side opening in the independent compartment.

[0043] 10 Cargo section 12 Underdeck passage 20 Bow section 21 Bow equipment 30 Aft section 31 Engine room 32 Aft equipment 34 Mooring line area 35 Independent compartment 40 Electrical cable 43 Partial electrical cable 46 Cable junction box 50 Upper deck 59 Mooring line 61 Cargo section side entrance 62 Aft section side entrance 63 Aft area 100 Liquefied gas carrier

Claims

1. A liquefied gas carrier comprising: an engine room located in the stern section aft of the cargo section which stores liquefied gas; stern equipment located outside the engine room in the stern section; bow equipment located in the bow section forward of the cargo section; an under-deck passage extending in the fore-and-aft direction below the upper deck of the cargo section; an independent compartment which is independent from the engine room and includes a cargo section side entrance which opens into the under-deck passage and an aft section side entrance which opens into an aft area on the upper deck of the aft section; and an electric cable which connects the bow equipment and the aft equipment via the under-deck passage, the independent compartment, and the aft area.

2. A liquefied gas carrier according to claim 1, wherein the electric cable includes a plurality of partial electric cables connected in the extending direction, and further comprising a cable junction box located in the independent compartment and connecting the partial electric cables together.

3. A liquefied gas carrier as described in claim 1, further comprising a mooring line area located on the upper deck of the stern section through which mooring lines pass, the independent compartment being located below the mooring line area, and the stern side opening of the independent compartment being located outside the mooring line area.

4. A liquefied gas carrier as described in claim 1, wherein at least a portion of the independent compartment is located below the upper deck.

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