Roll-on / roll-off ship equipped with tank for storing liquefied gas

Abstract

To provide a roll-on / roll-off ship, in which a tank for storing liquefied flammable gas is arranged and a size of the tank is determined.SOLUTION: A roll-on / roll-off ship (1) is equipped with: a ship hull (3) comprising a bottom part with double walls; a plurality of intermediate decks including a main cargo-handling deck; at least one cargo handling ramp; a bearing pillar (11) extending in a height direction; an engine room; and a sealed / insulated tank (2) for storing liquified flammable gas, which has a membrane and supplies flammable gas to a propulsion system. The sealed / insulated tank (2) is arranged to contact an inner wall of the bottom part, below the main cargo-handling deck, in the height direction, and the sealed / insulated tank (2) is arranged between a first pillar row (12) and a second pillar row (13) in a transverse direction (T) of the roll-on / roll-off ship.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The invention relates to the field of so-called "Roll-on-Roll-off" (RORO) ships for loading and transporting towed or self-propelled wheeled cargo, such as for example vehicles, from one or several access ramps. The invention specifically relates to the field of Roll-on-Roll-off ships comprising a sealed insulated tank for the cryogenic storage of liquefied flammable gas, the sealed insulated tank having a membrane. The tank is intended to contain a liquefied gas used as fuel for propulsion of the Roll-on-Roll-off ship.

[0002] In one embodiment, the liquefied gas is LNG, i.e. a mixture with high methane content stored at atmospheric pressure at about −162° C. Other liquefied flammable gases can also be used, in particular ethane, propane, butane, liquefied petroleum gas (LPG) or ethylene. [Background technology]

[0003] Roll-on-roll-off vessels for the transportation of towed or self-propelled wheeled cargo are known from the prior art.

[0004] The vessel comprises a hull having a bottom and an outer deck spaced apart from the bottom in the height direction, a plurality of intermediate decks arranged between the bottom of the hull and the outer deck, the plurality of intermediate decks including a main loading deck and one or more storage decks, a loading ramp connected to the main loading deck, and a bearing pillar extending in the height direction such that a first end is fixed to the bottom and a second end is fixed to, for example, the outer deck. The bearing pillars are generally arranged in a plurality of pillar rows along the longitudinal direction of the vessel. The main loading deck thus corresponds to a fixed deck to which cargo is transported on the loading ramp used for cargo handling operations.

[0005] The above mentioned bearing pillars play an essential role in the stiffening of the ship's hull, since, in contrast to traditional ships, roll-on-roll-off ships have no bulkheads above the storage deck that would divide the interior of the hull and stiffen it. This absence of bulkheads is necessary to allow the movement of towed or self-propelled wheeled cargo on the intermediate deck.

[0006] Said ships mainly use petroleum derivatives as fuel, such as heavy fuel oil (HFO), whose boiling point is considerably higher than the ambient temperature, such as 120-600°C. To store such fuel, the prior art ships are provided with one or more tanks in the hull. These tanks can store their contents in liquid form at ambient temperature, without requiring any special equipment. Thus, said tanks are installed in the ship without any hindrance and are located in particularly open areas of the ship, such as the sides.

[0007] However, changes in legal regulations, particularly those governing greenhouse gas emissions for maritime transport, require changes in propulsion technology for the roll-on / roll-off vessels mentioned above.

[0008] Compared to traditional heavy fuel oil, burning LNG reduces sulfur oxides and particulates by 100%, nitrogen oxides by 80%, and CO 2 would be reduced by 20%. LNG is currently the most technically, operationally and environmentally efficient carbon-based fuel. Summary of the Invention

[0009] One basic concept of this invention is to develop the location and dimensions of tanks for the storage of liquefied flammable gases on roll-on-roll-off ships.

[0010] In one embodiment, the present invention provides a roll-on, roll-off vessel comprising: - a hull having a double-walled bottom having an inner wall and an outer wall, and an outer deck spaced apart in height from the bottom; a plurality of intermediate decks disposed between the bottom of the hull and the outer deck, the intermediate decks including a main loading deck and one or more storage decks; - a plurality of bearing pillars extending in the height direction, each bearing pillar having a lower end fixed to the bottom of the hull, each bearing pillar extending in the height direction so as to pass through the intermediate deck and support the intermediate deck, and arranged in at least a first pillar row and a second pillar row, the bearing pillars of a particular pillar row being spaced apart from each other in the longitudinal direction of the roll-on-roll-off vessel; - a machinery room arranged within the hull and including a propulsion system; a sealed, insulated tank for storing a liquefied flammable gas, the sealed, insulated tank being adapted to supply said liquefied flammable gas to said propulsion system; a cofferdam wall isolating the engine room from the sealed insulated tank; Equipped with - the sealed insulated tank is disposed between the main loading deck and the inner wall of the bottom of the hull in the height direction; the sealed insulated tank is arranged between the first and second rows of pillars in a transverse direction of the roll-on-roll-off ship perpendicular to the height direction and the longitudinal direction of the roll-on-roll-off ship;

[0011] The above features allow the tank arrangement and its dimensions to be adapted to the specific structure of the roll-on-roll-off ship without requiring major structural modifications that would entail extensive new structural calculations, because the arrangement of the tanks between the pillars allows the bearing pillars to be maintained. Furthermore, the tanks are entirely located between the bottom of the double wall and the main loading deck, so they are not in the way during loading and unloading operations and no modifications are required for cargo movement. Finally, the location of the tanks near the engine room limits the flow of flammable gases inside the ship.

[0012] Depending on the embodiment, the vessel described above may have one or more of the following features.

[0013] In one embodiment the roll-on, roll-off vessel comprises at least one loading ramp connected to the main loading deck.

[0014] In one embodiment, the cofferdam wall has an inner skin and an outer skin spaced apart from the inner skin.

[0015] In one embodiment, the tank is parallelepiped shaped.

[0016] In one embodiment, the tank is in the shape of a polyhedron having eight or ten sides.

[0017] In one embodiment, the sealed, insulated tank is a tank with a membrane, preferably a tank for storing LNG.

[0018] In one embodiment, the longitudinal dimension of the sealed insulated tank extends in the longitudinal direction from the cofferdam wall to a bow portion of the roll-on-roll-off vessel.

[0019] This feature allows the longitudinal dimension of the tank to be easily adjusted depending on the desired load, i.e. maximum capacity of liquefied gas.

[0020] In one embodiment, the main loading deck is fixed and at least one storage deck is movable in the elevation to vary the distance between two adjacent intermediate decks for placing bulky cargo.

[0021] In one embodiment, the storage deck, located above or below the main loading and unloading deck, is movable in the height direction.

[0022] In one embodiment at least one, and preferably a plurality or each of said bearing pillars extends in said elevation through and supporting all said intermediate decks.

[0023] In one embodiment, the tank is located centrally of the vessel in the lateral direction.

[0024] In one embodiment, the ship has a tank connection space having a tank valve and at least one dome structure arranged therein, and the tank connection space is arranged between the ceiling wall of the tank and the main loading and unloading deck in the height direction.

[0025] Thus, the tank connection space is also located between the bottom of the double wall and the main loading deck, and is not in the way during loading and unloading operations, eliminating the need to correct cargo movements.

[0026] In one embodiment, the cofferdam wall is an aft cofferdam wall, and the tank comprises an aft tank wall isolated from the engine room by the aft cofferdam wall, a forward tank wall spaced apart from the aft tank wall in the longitudinal direction of the ship, a bottom tank wall preferably arranged to abut against the inner wall of the bottom of the hull, a ceiling tank wall spaced apart from the bottom tank wall in the height direction, and two longitudinal tank walls.

[0027] In one embodiment, each of the longitudinal tank walls is fixed to a longitudinal cofferdam wall, each of the longitudinal cofferdam walls preferably having an inner skin portion and an outer skin portion spaced apart from the inner skin portion in the transverse direction of the ship.

[0028] In one embodiment, the cofferdam wall(s) are made of metal, such as steel.

[0029] In one embodiment, the inner and / or outer skins are formed from layers of sheet metal, for example steel.

[0030] In one embodiment, the bearing pillar is made of metal, such as steel.

[0031] In one embodiment, at least one of the bearing pillars of the first pillar row is arranged in one of the longitudinal cofferdam walls and / or at least one of the bearing pillars of the second pillar row is arranged in the other of the longitudinal cofferdam walls.

[0032] In this way, by locating the pillars adjacent the tank within the longitudinal cofferdam wall, the lateral dimensions of the tank can be maximized without modifying the placement of the pillars within the vessel hull.

[0033] In one embodiment, at least one of the bearing pillars located within the cofferdam wall is made of a higher grade steel than the other bearing pillars.

[0034] Thus, the temperature at the cofferdam wall adjacent to the tanks may be lower than other parts of the ship due to its proximity to the liquefied gas storage tanks. A higher steel grade for the pillars can compensate for this temperature difference and maintain sufficient mechanical strength.

[0035] In another embodiment, at least one of the bearing pillars located within the cofferdam wall may be made of the same grade of steel as the other bearing pillars.

[0036] In one embodiment, the at least one bearing pillar of the first row of pillars is configured to abut an inner or outer skin of the longitudinal cofferdam wall.

[0037] In one embodiment, the at least one bearing pillar of the second row of pillars is configured to bear against an inner or outer skin of the longitudinal cofferdam wall.

[0038] In one embodiment, the inner and outer skins of the longitudinal cofferdam wall have stiffeners projecting in the lateral direction, thereby stiffening the inner and outer skins.

[0039] Bearing pillars arranged against the inner or outer skin of the longitudinal cofferdam wall also contribute to its stiffness and, more preferably, make some of the above-mentioned stiffeners unnecessary.

[0040] In one embodiment, the upper end of each bearing pillar is fixed to the outer deck.

[0041] In one embodiment, the tank has a plurality of tank walls each having a multi-layer structure, and each of the tank walls has, from the outside to the inside of the tank, a secondary insulation barrier, a secondary sealing membrane arranged to abut against the secondary insulation barrier, a primary insulation barrier arranged to abut against the secondary sealing membrane, and a primary sealing membrane arranged to abut against the primary insulation barrier and in contact with the liquefied flammable gas.

[0042] In one embodiment, the present invention also provides a transfer system for liquefied flammable gas, comprising a roll-on-roll-off vessel as described above, an insulated pipeline arranged to connect the tank installed in the hull of the roll-on-roll-off vessel to a floating or onshore storage facility, and a pump for delivering a flow of cryogenic liquid product from the floating or onshore storage facility through the insulated pipeline to the tank of the roll-on-roll-off vessel.

[0043] In one embodiment the invention also provides a method for fuelling a roll-on-roll-off vessel as described above, comprising transporting liquefied flammable gas from a floating or onshore storage facility via an insulated pipeline to the tanks of the roll-on-roll-off vessel.

[0044] The present invention will be better understood and other objects, details, features and advantages of the present invention will become more apparent from the following description of several specific embodiments of the present invention, taken in conjunction with the accompanying drawings, in which the specific embodiments are merely illustrative and are not intended to limit the present invention. [Brief description of the drawings]

[0045] [Figure 1] FIG. 1 is an interior side view of a roll-on, roll-off ship of one embodiment. [Diagram 2] FIG. 2 shows detail II of FIG. 1, specifically showing the storage tanks of the vessel's hull. [Diagram 3] FIG. 3 is a partial cross-sectional view along plane III-III in FIG. 1, showing the arrangement of the bearing pillars relative to the storage tank of the first embodiment. [Figure 4] FIG. 3 is a partial cross-sectional view along plane III-III of FIG. 1, showing the lateral arrangement of the bearing pillars relative to the storage tank of the second embodiment. [Diagram 5] FIG. 2 is a cross-sectional view along plane VV of FIG. 1 showing the longitudinal arrangement of the bearing pillars relative to the storage tank of the second embodiment. [Figure 6] FIG. 6 shows detail VI of FIG. 5, specifically showing the storage tank and part of the bearing pillar. [Figure 7] FIG. 1 shows a roll-on, roll-off vessel with storage tanks for liquefied flammable gas and a terminal for filling the tanks. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0046] Hereinafter, with reference to Figs. 1 to 7, a roll-on / roll-off ship 1 according to various embodiments will be described.

[0047] As mentioned above, a roll-on-roll-off (RORO) ship 1 has a special structure for allowing towed or self-propelled wheeled cargo to be moved freely between different cargo decks, and this ship 1 is designed so that the cargo can enter the ship 1 under its own power and leave the ship 1 in the same way. This cargo can be, for example, automobiles, vehicles capable of road transport and loading of cargo (trucks with trailers, articulated trucks), heavy machinery for construction and public works, agricultural equipment such as tractors, or containers attached to loading vehicles such as forklift trucks or trailers.

[0048] Therefore, in contrast to conventional cargo ships in which cargo is lifted vertically by a hoist such as a crane and loaded onto the ship, a RORO ship uses a movable loading ramp 10 that is connected to a ramp installed on the shore side of the port or is connected directly to the shore side, and the cargo is loaded and unloaded by moving it around the ship as the ship enters and leaves.

[0049] To carry out such loading and unloading operations, the roll-on / roll-off vessel 1 is equipped with: a hull 3 with a double-walled bottom 4 and an outer deck 7 spaced apart in height from said bottom 4, - several intermediate decks 8, 9 arranged between the bottom 4 of the hull 3 and the outer deck 7, including a main loading and unloading deck 8 and one or more storage decks 9; at least one loading ramp 10 connected to the main loading deck 8; - a bearing pillar 11 extending vertically through the intermediate decks 8, 9 to support them; - a machinery room 14 arranged in the hull 3 and equipped with a propulsion system 15; a sealed, insulated tank 2 for storing liquefied flammable gas, said tank having a membrane and for supplying the flammable gas to a propulsion system 15;

[0050] The double-walled bottom 4 is composed of an inner wall 5 and an outer wall 6. Thus, the lower end of the bearing pillar 11 can be fixed to the inner wall 5 of the bottom 4, and the upper end can be fixed to the outer deck 7.

[0051] The bearing pillars 11 are arranged in a first pillar row 12 and a second pillar row 13 in the embodiment shown in Figures 5 and 6. The bearing pillars 11 of a particular row 12, 13 are spaced apart from each other in the longitudinal direction L of the vessel 1. Furthermore, these two rows 12, 13 are symmetrically arranged in the transverse direction T in order to provide a balanced and stiffened hull 3 over the entire length of the vessel 1. In other embodiments (not shown), the bearing pillars 11 can be arranged in more than two rows, such as four rows, preferably an even number of rows.

[0052] FIG. 1 shows a roll-on-roll-off ship 1 of one configuration example. Specifically, the roll-on-roll-off ship 1 of this example has 12 intermediate decks, and therefore has 11 storage decks 9 and one main loading deck 8. The inner wall 5 of the bottom 4 is also used as the storage deck 9, and when each deck is numbered in order from the lowest deck to the highest deck in the height direction H of the ship 1, the inner wall 5 of the bottom 4 is usually the first deck. Therefore, in this configuration, the main loading deck 8 is the fifth deck. The intermediate decks 8, 9 and the inner wall 4 are connected to each other using an access ramp 16 or a vertical lifting system.

[0053] The structure of the tank 2 and its arrangement and dimensions in the hull 3 of the ship 1 will now be described in detail.

[0054] The tank 2 has a parallelepiped shape here, as can be seen in Figure 2, and has several tank walls, namely a rear tank wall 17, a front tank wall 18 opposite the rear tank wall 17, a bottom wall 19, a ceiling wall 20 opposite the bottom wall 19, and two longitudinal walls 21. The bottom wall 19 is arranged to abut against the inner wall 5 of the bottom 4.

[0055] The other tank walls 17, 18, 20, 21 except for the bottom wall 19 are fixed to a cofferdam wall 22, which, as can be seen from Figures 2 to 4, constitutes the support structure of the tank 2 together with the inner wall 5 of the hull 3. The cofferdam wall 22 is formed by an inner skin portion 23 to which the tank walls 17, 18, 20, 21 are fixed, and an outer skin portion 24 spaced apart from the inner skin portion 23. In order to increase the rigidity of the inner skin portion 23 and the outer skin portion 24 inside the cofferdam wall 22, stiffeners 25 are arranged in these skin portions 23, 24.

[0056] The tank 2 is arranged in the hull 3 in such a way that one of the cofferdam walls 22 separates the engine room 14 from the aft tank wall 17, as shown in Figure 2. The engine room 14 is here arranged in the inner wall 5 of the bottom 4 at the stern of the ship 1 in the longitudinal direction L of the ship 1.

[0057] Each tank wall 17-21 has a multi-layer structure, each of which includes, from the outside to the inside of the tank, a secondary insulating barrier, a secondary sealing membrane arranged to abut against the secondary insulating barrier, a primary insulating barrier arranged to abut against the secondary sealing membrane, and a primary sealing membrane arranged to abut against the primary insulating barrier and in contact with the liquefied flammable gas. For example, such tanks with membranes are described in particular in WO 2019 / 239048, WO 14057221, FR 2691520 and FR 2877638. Tanks with membranes can be constructed in particular with the GTT® Next1, Mark V, Mark III and NO96® technologies developed by the applicant.

[0058] As can be seen from Figure 2, there is a tank connection space 26 on top of the ceiling wall 20, and this tank connection space 26 is surrounded by the cofferdam wall 22. The tank connection space 26 has in particular a dome structure 27 through which a fuel supply pipe 28 passes in particular through the ceiling wall 20 in order to fill the tank 2 with liquefied flammable gas. This tank connection space 26 is a secured space in which the pipes passing through the ceiling wall 20 are connected to other equipment of the ship, such as tank valves, etc.

[0059] The ship 1 is also provided with a fuel preparation chamber 29, which is shown in Figures 5 and 6. The fuel preparation chamber 29 is arranged adjacent to one of the longitudinal walls 21 of the tank 2 and adjacent to the engine room 14. The fuel preparation chamber 29 is equipped in particular with devices for preparing the combustible gas in order to adjust its pressure and temperature to values ​​suitable for the propulsion system 15.

[0060] Therefore, the tanks 2, the cofferdam walls 22 and the tank connection space 26 are sized to be disposed below the main loading / unloading deck 8 as shown in Fig. 2, because in the configuration example of Fig. 2, the uppermost one of the cofferdam walls 22, i.e., the cofferdam wall 22 located above the tank connection space 26, is located at the height of the fourth deck, i.e., one of the storage decks 9. Therefore, the structure of the tanks 2 and their equipment, such as the structure of the tank connection space 26, does not affect the configuration of the main loading / unloading deck 8.

[0061] 3 and 4 show two embodiments of the arrangement and dimensions of the tank 2 relative to the bearing pillar 11.

[0062] 3 and 4 show the first to fifth decks, the tank 2, and one of the bearing pillars 11 of the first pillar row. Since the configuration is symmetrical in the transverse direction T, only half of the cross section of the ship 1 is shown. Therefore, in the configuration of this example shown in FIGS. 3 and 4, the second deck, which is the storage deck 9, and the fourth deck are movable in the height direction H, and the third deck, which is the storage deck 9, and the fifth deck, which is the main loading and unloading deck 8, are fixed in the height direction H. These fixed decks are configured to withstand higher loads than the movable decks.

[0063] In the first embodiment of Fig. 3, the tank 2 and the longitudinal cofferdam wall 22 are arranged between the two pillar rows 12, 13 in the transverse direction T, because, as shown, the longitudinal cofferdam wall 22 is arranged against one bearing pillar 11 of the first pillar row 12. The structure of the tank 2 and the cofferdam wall 22 therefore does not affect the configuration and arrangement of the bearing pillar 11. In an alternative embodiment (not shown), the longitudinal cofferdam 22 is still surrounded by the two pillar rows 12, 13, but can be arranged at a distance from the pillar rows 12, 13.

[0064] In the second embodiment of Fig. 4, one bearing pillar 11 of the first pillar row 12 is arranged in one of the longitudinal cofferdam walls 22, i.e. against the inner skin 23. The structure of the tank 2 and the cofferdam walls 22 therefore does not affect the configuration and arrangement of the bearing pillar 11. Moreover, in contrast to the first embodiment, a tank with a maximally enlarged lateral dimension can be obtained without affecting the arrangement of the bearing pillar 11. The increase in width of the tank 2 is substantially equal to the lateral dimension of the longitudinal cofferdam walls 22.

[0065] In another embodiment (not shown), one bearing pillar 11 of the first row of pillars 12 is arranged in one of the longitudinal cofferdam walls 22, i.e. against the outer skin 24. Thus, as mentioned above, the structure of the tank 2 and the cofferdam wall 22 does not affect the configuration and arrangement of the bearing pillar 11.

[0066] It can thus be seen that the bearing pillars 11 in each row 12, 13 are generally aligned in the longitudinal direction.

[0067] 5 and 6 are cross-sectional views of the ship 1 so as to show all the bearing pillars 11 of each pillar row 12, 13 and the arrangement of the tanks 2 and cofferdam walls 22 relative to these bearing pillars 11.

[0068] Specifically, as can be seen in the detailed view of Figure 6, the three bearing pillars 11 of each pillar row 12, 13 in this embodiment are arranged in the longitudinal cofferdam wall 22. The number of bearing pillars in the cofferdam wall 22 depends on the length of the ship 1, the total number of pillars and the longitudinal length L of the tank 2.

[0069] Referring to Figure 7, this is a diagram of a roll-on-roll-off vessel 1 having a sealed insulated tank 2 mounted in the hull 3 of the vessel 1. Obviously, a pipeline for supplying fuel to the vessel can be connected by suitable connectors to an offshore or port terminal for transferring an LNG fuelled cargo to the tank 2.

[0070] FIG. 7 shows an example of a marine terminal with a fuel supply station 75, an underwater pipe 76 and an onshore facility 77. The fuel supply station 75 is a fixed offshore facility with a movable arm 74 and a tower 78 supporting the movable arm 74. The movable arm 74 supports at least one flexible tube 79 that can be connected to a pipeline for supplying fuel to the vessel. The movable arm 74 is directional adjustable and is suitable for vessels of any size. A connecting pipe (not shown) extends inside the tower 78. The fuel supply station 75 is for filling the roll-on-roll-off vessel 1 with LNG fuel from the onshore facility 77. The onshore facility 77 comprises a liquefied gas storage tank 80 and a connecting pipe 81 connected to the fuel supply station 75 by an underwater pipe 76. The underwater pipe 76 allows the transfer of liquefied gas over long distances, e.g. 5 km, between the fuel supply station 75 and the onshore facility 77, so that the roll-on-roll-off vessel 1 can be kept far away from the shore during the fuel supply operation.

[0071] To generate the pressure required to transport the liquefied gas, pumps on board the ship 1 and / or pumps mounted at a shore facility 77 and / or pumps mounted at a fuel supply station 75 are used.

[0072] Although the present invention has been described with reference to several specific embodiments, this is not intended to limit the present invention, and the present invention also includes all technical equivalents of the means described herein and combinations thereof that fall within the scope of the present invention.

[0073] Use of the verb "comprise" or "include" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim.

[0074] In the claims, any reference signs in parentheses shall not be construed as limiting the scope of the claims.

Claims

1. A hull (3) having a double-walled bottom (4) having an inner wall (5) and an outer wall (6), and an outer deck (7) spaced apart from the bottom (4) in a height direction (H); a plurality of intermediate decks, including a main loading and unloading deck (8) and one or more storage decks (9), disposed between the bottom (4) of the hull (3) and the outer deck (7); a plurality of bearing pillars (11) whose lower ends are fixed to the bottom (4) of the hull (3), each extending in the height direction (H) so as to pass through the intermediate deck and support the intermediate deck, and arranged in at least a first pillar row (12) and a second pillar row (13), the bearing pillars (11) of a particular pillar row being spaced apart from each other in the longitudinal direction (L) of the roll-on / roll-off ship; an engine room (14) arranged within the hull (3) and equipped with a propulsion system (15); a sealed, insulated tank (2) for storing a liquefied flammable gas, the sealed, insulated tank (2) for supplying the liquefied flammable gas to the propulsion system (15); a cofferdam wall (22) isolating the engine room (14) from the sealed insulated tank (2); A roll-on, roll-off ship comprising: The sealed insulated tank (2) is disposed between the main loading deck (8) and the inner wall (5) of the bottom (4) of the hull (3) in the height direction (H), The sealed insulated tank (2) is disposed between the first pillar row (12) and the second pillar row (13) in a transverse direction (T) of the roll-on-roll-off ship perpendicular to the height direction (H) and the longitudinal direction (L) of the roll-on-roll-off ship (1). A roll-on, roll-off ship (1).

2. the sealed insulated tank (2) is arranged in the center of the roll-on / roll-off ship in the transverse direction (T); The roll-on, roll-off ship (1) according to claim 1.

3. a tank connection space (26) having a tank valve and at least one dome structure disposed therein; The tank connection space (26) is disposed between the ceiling wall of the sealed insulated tank and the main loading deck (8) in the height direction (H). A roll-on, roll-off ship (1) according to claim 1 or 2.

4. the longitudinal dimension of the sealed insulated tank (2) extends in the longitudinal direction from the cofferdam wall to the bow of the roll-on-roll-off ship; A roll-on, roll-off ship (1) according to claim 1 or 2.

5. the cofferdam wall is an aft cofferdam wall (22); The sealed insulated tank comprises: a rear tank wall (17) isolated from the engine room (14) by the rear cofferdam wall (22); a front tank wall (18) spaced apart from the rear tank wall (17) in the longitudinal direction (L) of the roll-on-roll-off ship; A bottom tank wall (19) preferably disposed against the inner wall (5) of the bottom (4) of the hull (3); a top tank wall (20) spaced apart from the bottom tank wall (19) in the height direction (H); Two longitudinal tank walls (21), Equipped with A roll-on, roll-off ship (1) according to claim 1 or 2.

6. Each of said longitudinal tank walls (21) is fixed to a longitudinal cofferdam wall (22); Each of said longitudinal cofferdam walls (22) preferably has an inner skin portion (23) and an outer skin portion (24) spaced apart from said inner skin portion (23) in the transverse direction (T) of the roll-on-roll-off ship (1). A roll-on, roll-off ship (1) according to claim 5.

7. at least one of the bearing pillars (11) of the first pillar row (12) is arranged in one of the longitudinal cofferdam walls (22) and / or at least one of the bearing pillars (11) of the second pillar row (13) is arranged in the other of the longitudinal cofferdam walls (22), A roll-on, roll-off ship (1) according to claim 6.

8. The sealed insulated tank (2) includes a plurality of tank walls (17, 18, 19, 20, 21) each having a multi-layer structure; Each tank wall includes, from the outside to the inside of the sealed and insulated tank (2), a secondary insulating barrier, a secondary sealing membrane arranged to abut against the secondary insulating barrier, a primary insulating barrier arranged to abut against the secondary sealing membrane, and a primary sealing membrane arranged to abut against the primary insulating barrier and in contact with the liquefied flammable gas. A roll-on, roll-off ship (1) according to claim 1 or 2.

9. 1. A transfer system for a liquefied flammable gas, comprising: A roll-on, roll-off ship (1) according to claim 1 or 2; an insulated pipeline (79, 76, 81) arranged to connect the sealed insulated tank (2) installed in the hull of the roll-on-roll-off ship (1) to a floating or coastal storage facility (77); a pump for delivering a flow of cryogenic liquid product from said floating or coastal storage facility through said insulated pipeline to said sealed insulated tank of said roll-on, roll-off vessel (1); A transfer system comprising:

10. A method for fuelling a roll-on, roll-off ship (1) according to claim 1 or 2, comprising the steps of:

1. A method comprising the steps of: transporting liquefied flammable gas from a floating or coastal storage facility (77) via an insulated pipeline (79, 76, 81) to said sealed insulated tank of said roll-on, roll-off vessel (1).

Images