Tank system and floating body

Abstract

To provide a configuration capable of sucking residual liquid in suction wells at low cost even in a case of including a plurality of suction wells.SOLUTION: A tank system includes a tank which can store liquid in an inside thereof, a plurality of suction wells which is provided in a bottom of the tank and is recessed downward from the bottom, a connection pipe for connecting the plurality of suction wells to each other, and a suction part which can suck the liquid in the suction well from at least one of the plurality of suction wells.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a tank system and a floating body.

Background Art

[0002] Patent Document 1 discloses a configuration in which a suction well is provided at the bottom of a tank (liquid cargo tank) in which a liquid is stored, and the residual liquid (residual oil) in the suction well is sucked by a suction system including a vacuum pump and a straw pipe.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For example, when the tank is a multi-lobe type in which a plurality of tank parts are combined, the residual liquid accumulates at the bottom of each of the plurality of tank parts. Therefore, a suction well is provided in each of the plurality of tank parts. When applying the configuration described in Patent Document 1 to such a tank, it is necessary to install a suction system in each of the suction wells of the plurality of tank parts, which leads to an increase in equipment costs.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to provide a tank system and a floating body that can realize, at low cost, a configuration capable of sucking the residual liquid in the suction well even when a plurality of suction wells are provided.

Means for Solving the Problems

[0006] To solve the above problems, the tank system according to the present disclosure includes a tank portion, a plurality of suction wells, a connecting pipe, and a suction portion. The tank portion can accommodate liquid therein. The plurality of suction wells are provided at the bottom of the tank portion and are recessed downward from the bottom. The connecting pipe connects the plurality of suction wells to each other. The suction portion can suck the liquid in at least one of the plurality of suction wells from the suction well.

[0007] The floating body according to the present disclosure includes the tank system as described above.

Advantages of the Invention

[0008] According to the tank system and the floating body of the present disclosure, even when a plurality of suction wells are provided, a configuration capable of sucking the remaining liquid in the suction well can be realized at low cost.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0010] <First Embodiment> Hereinafter, a tank system and a floating body according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 6. (Configuration of the floating body) As shown in FIG. 1, the floating body 1 of the present embodiment includes at least a floating body main body 2 and a tank system 10A. Examples of the floating body 1 include carriers for liquefied gases such as carbon dioxide, liquefied natural gas (LNG), and ammonia, cargo ships, ferries, RORO ships (Roll-on / Roll-off ships), PCTCs (Pure Car & Truck Carriers), passenger ships, observation and research ships, and the like.

[0011] (Configuration of the floating body main body) The floating body main body 2 has a pair of side plates 3A and 3B forming its outer shell, a bottom 4, and an upper deck 5. The side plates 3A and 3B have a pair of side shell plates forming the left and right sides, respectively. The bottom 4 has a bottom shell plate connecting these side plates 3A and 3B. An upper structure 7 having a living area is formed on the upper deck 5 on the stern 2b side of the floating body main body 2, for example.

[0012] (Configuration of the tank system) FIG. 2 is a diagram showing the configuration of the tank system according to the embodiment of the present disclosure, and is a cross-sectional view seen from a direction along the axis of the tank portion. As shown in FIG. 2, the tank system 10A includes at least a tank portion 11, a suction well 12, a connecting pipe 15, and a suction portion 17.

[0013] The tank portion 11 can store liquid inside. Examples of the liquid stored in the tank portion 11 include liquefied gases such as carbon dioxide, liquefied natural gas (LNG), and ammonia. The tank portion 11 of the present embodiment is accommodated in the floating body main body 2, for example. The tank portion 11 of the present embodiment may store liquid as fuel for combustors such as main engines, auxiliary machines, and generator engines (none of which are shown) accommodated in the floating body main body 2, for example.

[0014] As shown in FIG. 1, in this first embodiment, for example, two tank systems 10A are provided side by side in the fore-and-aft direction FA of the ship. Note that the number of installed tank systems 10A, their arrangement, etc. are not limited in any way and can be changed as appropriate.

[0015] Each tank section 11 has a cylindrical shape with an axis O extending in the horizontal direction. In this first embodiment, the axis O of the tank section 11 extends in the fore-and-aft direction FA of the ship. The tank sections 11 of each tank system 10A are arranged side by side in the fore-and-aft direction FA. As shown in FIG. 2, the tank section 11 exemplified in this first embodiment has a so-called Tri-lobe shape, and one tank section 11 includes a first body section 111, a second body section 112, and a third body section 113, respectively.

[0016] The first body section 111 and the second body section 112 are provided at the lower part of the tank section 11. The first body section 111 and the second body section 112 are arranged side by side in the horizontal direction (ship width direction Dw) intersecting the axis O. The third body section 113 is provided at the upper part of the tank section 11. The third body section 113 is provided so as to straddle the upper part of the first body section 111 and the upper part of the second body section 112.

[0017] As shown in FIG. 1, the first body section 111 includes a cylindrical section 114A and a bulkhead section 115A. The cylindrical section 114A is provided in the middle part of the first body section 111 in the fore-and-aft direction FA and has a shape approximating a continuous cylinder in the fore-and-aft direction FA. Specifically, the cylindrical section 114A is formed in a C-shaped (arc-shaped) cross-section that curves with a certain curvature when viewed from the direction along the axis O. The bulkhead sections 115A are respectively provided at both ends of the cylindrical section 114A in the fore-and-aft direction FA. Each bulkhead section 115A is hemispherical and is formed to close the openings at both ends of the cylindrical section 114A in the fore-and-aft direction FA. An accommodation space S1 (see FIG. 2) is formed inside the first body section 111.

[0018] The second body portion 112 includes a cylindrical portion 114B and a bulkhead portion 115B. The cylindrical portion 114B is provided at the middle portion of the second body portion 112 in the fore-and-aft direction FA, and has a shape approximating a continuous cylinder in the fore-and-aft direction FA. Specifically, the cylindrical portion 114B is formed in a C-shaped (arc-shaped) cross-section that curves with a certain curvature when viewed from the direction along the axis O. One end in the circumferential direction of the cylindrical portion 114B is joined to one end in the circumferential direction of the cylindrical portion 114A. The bulkhead portions 115B are respectively provided at both ends of the cylindrical portion 114B in the fore-and-aft direction FA. Each bulkhead portion 115B is hemispherical and closes the openings at both ends of the cylindrical portion 114B in the fore-and-aft direction FA. An accommodation space S2 (see FIG. 2) is formed inside the second body portion 112.

[0019] The third body portion 113 includes a cylindrical portion 114C and a bulkhead portion 115C. The cylindrical portion 114C is provided at the middle portion of the third body portion 113 in the fore-and-aft direction FA, and has a shape approximating a continuous cylinder in the fore-and-aft direction FA. Specifically, the cylindrical portion 114C is formed in a C-shaped (arc-shaped) cross-section that curves with a certain curvature when viewed from the direction along the axis O. One end in the circumferential direction of the cylindrical portion 114C is joined to the other end in the circumferential direction of the cylindrical portion 114A. The other end in the circumferential direction of the cylindrical portion 114C is joined to the other end in the circumferential direction of the cylindrical portion 114B. The bulkhead portions 115C are respectively provided at both ends in the fore-and-aft direction FA. Each bulkhead portion 115C is hemispherical and closes the openings at both ends of the cylindrical portion 114C in the fore-and-aft direction FA. An accommodation space S3 (see FIG. 2) is formed inside the third body portion 113.

[0020] As shown in FIG. 2, in this first embodiment, the accommodation space S1 inside the first body portion 111, the accommodation space S2 inside the second body portion 112, and the accommodation space S3 inside the third body portion 113 communicate with each other. Note that the tank portion 11 may be provided with a partition wall (not shown) between the first body portion 111, the second body portion 112, and the third body portion 113 to partition the accommodation space S1 inside the first body portion 111, the accommodation space S2 inside the second body portion 112, and the accommodation space S3 inside the third body portion 113.

[0021] The lower part of the first body portion 111 and the lower part of the second body portion 112 form the bottom of the tank portion 11. The lower part of the first hull section 111 has a concave surface portion 111d that is concave downward in the vertical direction Dv. The concave surface portion 111d is formed at the bottom of a cylindrical portion 114A that is curved in a C-shaped cross section. As shown in FIG. 1, in the cylindrical portion 114A that is continuous in the fore-and-aft direction FA, when viewed from the horizontal direction intersecting the axis O, the concave surface portion 111d is formed to be concave downward in the fore-and-aft direction FA such that the position where the suction well 12A described later is provided is the lowermost part of the concave surface portion 111d.

[0022] As shown in FIG. 2, the lower part of the second hull section 112 has a concave surface portion 112d that is concave downward in the vertical direction Dv. The concave surface portion 112d is formed at the bottom of a cylindrical portion 114B that is curved in a C-shaped cross section. As shown in FIG. 1, in the cylindrical portion 114B that is continuous in the fore-and-aft direction FA, when viewed from the horizontal direction intersecting the axis O, the concave surface portion 112d is formed to be concave downward in the fore-and-aft direction FA such that the position where the suction well 12B described later is provided is the lowermost part of the concave surface portion 112d.

[0023] Thus, the bottom of the tank section 11 has the concave surface portion 111d formed in the first hull section 111 and the concave surface portion 112d formed in the second hull section 112. That is, the bottom of the tank section 11 has a plurality of concave surface portions 111d, 112d.

[0024] A plurality of suction wells 12 are provided at the bottom of the tank section 11. In this first embodiment, the suction well 12 has a suction well 12A provided in the first body section 111 and a suction well 12B provided in the second body section 112. The suction well 12A is provided at the lowermost part of the concave surface section 111d. The suction well 12A is formed by being recessed downward from the lowermost part (bottom) of the concave surface section 111d. The suction well 12B is provided at the lowermost part of the concave surface section 112d. The suction well 12B is formed by being recessed downward from the lowermost part (bottom) of the concave surface section 112d. Note that the suction well 12A and the suction well 12B in this first embodiment have the same shape as each other and are arranged at the same position in the vertical direction. However, the present invention is not limited to this configuration. For example, the suction well 12A provided with the suction section 17 may be arranged slightly lower than the suction well 12B.

[0025] As shown in FIG. 2, the connecting pipe 15 connects a plurality of suction wells 12 to each other. In this first embodiment, the connecting pipe 15 connects the suction well 12A and the suction well 12B. One end of the connecting pipe 15 is connected to the suction well 12A so as to communicate with the inside of the suction well 12A. The other end of the connecting pipe 15 is connected to the suction well 12B so as to communicate with the inside of the suction well 12B. Through this connecting pipe 15, the inside of the suction well 12A and the inside of the suction well 12B communicate with each other.

[0026] The outer peripheral surface of the connecting pipe 15 is covered with a heat insulating material 152. The heat insulating material 152 is made of a heat insulating material such as polyurethane, for example, and insulates between the inside of the connecting pipe 15 and the surrounding atmosphere when a low-temperature liquefied gas flows as a liquid through the connecting pipe 15.

[0027] In addition, the connecting pipe 15 of the first embodiment is provided with an opening / closing part 153. The opening / closing part 153 is provided in the middle of the connecting pipe 15. The opening / closing part 153 is composed of a valve or the like that can open and close the flow path in the connecting pipe 15. The opening and closing of the opening / closing part 153 are performed, for example, by remote operation or manual operation by an operator. In the tank system 10A in the first embodiment, it may be configured not to include the opening / closing part 153.

[0028] The suction part 17 can suck the liquid in at least one of the plurality of suction wells 12 from the suction well 12. In this first embodiment, the case where the suction part 17 is provided in the suction well 12A provided in the first body part 111 among the plurality of suction wells 12A and 12B is illustrated. The suction part 17 can suck, for example, the liquid in the suction well 12A provided in the first body part 111.

[0029] The suction part 17 includes a suction pipe 18 and a pump 19. The suction pipe 18 penetrates, for example, the top of the tank part 11 from the outside of the tank part 11 and extends toward the bottom inside the tank part 11. The tip of the suction pipe 18 in this embodiment is inserted into the suction well 12A.

[0030] The pump 19 is provided in the middle of the suction pipe 18. In this first embodiment, the pump 19 is provided, for example, outside the tank part 11 in the middle of the suction pipe 18. The pump 19 may be provided, for example, at the tip of the suction pipe 18, that is, inside the suction well 12A. The suction part 17 sends the liquid in the suction well 12A sucked up by the pump 19 to the outside (outside the ship) of the tank part 11 through the suction pipe 18.

[0031] When the liquid in the suction well 12A is sucked up by the suction part 17 and the opening / closing part 153 is opened, the liquid in the suction well 12B flows into the suction well 12A through the connecting pipe 15. Thus, with a single suction part 17, the liquid can be sucked out from the suction well 12A provided in the first barrel part 111 and the suction well 12B provided in the second barrel part 112. As the liquid in the tank part 11 is sucked out to the outside of the tank part 11 by the suction part 17, the level (liquid level) of the liquid in the tank part 11 gradually decreases. Finally, the liquid remaining in the tank part 11 accumulates in the suction wells 12A and 12B that are recessed downward from the concave parts 111d and 112d. The liquid accumulated in the suction wells 12A and 12B is sent from the suction well 12A to the outside of the tank part 11 by the suction part 17.

[0032] (Function and Effect) In the tank system 10A and the floating body 1 of the first embodiment, a plurality of suction wells 12 provided at the bottom of the tank part 11 are connected to each other by a connecting pipe 15. The suction part 17 can suck the liquid in at least one of the plurality of suction wells 12. Thus, the liquid accumulated in the plurality of suction wells 12 can be sucked in through the connecting pipe 15 from at least one suction well 12 provided with the suction part 17. Therefore, it is not necessary to provide a suction part 17 for each of the plurality of suction wells 12. As a result, even when a plurality of suction wells 12 are provided, a configuration capable of sucking the residual liquid in the suction well 12 can be realized at low cost.

[0033] Also, in the above embodiment, the suction wells 12 are provided in each of the plurality of concave parts 111d and 112d. As a result, in each of the plurality of concave portions 111d and 112d, the liquid remaining in the tank portion 11 can flow into the suction well 12. Then, the liquid accumulated in the plurality of suction wells 12 can be sucked from at least one suction well 12 provided with the suction portion 17 through the connection pipe 15.

[0034] Furthermore, in the first embodiment, a heat insulating material 152 covering the connection pipe 15 is further provided. As a result, liquefied gas, which is lower in temperature than the atmosphere, flows as a liquid inside the connection pipe 15 connecting the plurality of suction wells 12, and the connection pipe 15 is cooled by the liquefied gas, which is lower in temperature than the atmosphere, suppressing the occurrence of dew condensation and freezing on the outer peripheral surface of the connection pipe 15.

[0035] Also, in the first embodiment, the suction portion 17 includes a suction pipe 18 and a pump 19. As a result, the liquid flowing in from another suction well 12 through the connection pipe 15 can be sucked out by the pump 19 through the suction pipe 18. Therefore, it is possible to suppress the need to provide the suction pipe 18 and the pump 19 in all of the plurality of suction wells 12, and a configuration capable of sucking the residual liquid in the suction well 12 can be realized at low cost.

[0036] Furthermore, in the first embodiment, an opening / closing portion 153 for opening and closing the inside of the connection pipe 15 is provided. As a result, when the liquid is not sucked out by the suction portion 17, the liquid flow between the plurality of suction wells 12 through the connection pipe 15 can be blocked by closing the opening / closing portion 153. On the other hand, when discharging the liquid from the tank portion 11, by opening the opening / closing portion 153, the liquid accumulated in the plurality of suction wells 12 can be sucked from the suction well 12 of at least one tank portion 11 provided with the suction portion 17 through the connection pipe 15.

[0037] <Modification Example of the First Embodiment> In the above first embodiment, a trilobe type is exemplified as the tank unit 11, but the configuration of the tank unit 11 is not limited to this. For example, the tank unit 11 may be a bi-lobe type having two body portions, or a multi-lobe type having four or more body portions.

[0038] Also, in the above embodiment, the suction unit 17 is provided in the suction well 12A provided in the first body portion 111, but it is not limited to this. The suction unit 17 may be provided in the suction well 12B provided in the second body portion 112. FIG. 3 is a diagram showing the configuration of a tank system according to a modified example of the first embodiment of the present disclosure, and is a cross-sectional view of the tank unit as viewed from a direction along the axis. As shown in FIG. 3, the suction unit 17 may be provided in both the suction well 12A provided in the first body portion 111 and the suction well 12B provided in the second body portion 112. In this case, when sucking out the liquid in the tank unit 11, both the suction unit 17A provided in the suction well 12A and the suction unit 17B provided in the suction well 12B are used. When one of the pumps 19 of the suction unit 17A and the suction unit 17B cannot be used due to a failure, maintenance, etc., the liquid in the tank unit 11 is sucked out by the other pump 19 of the suction unit 17A and the suction unit 17B. That is, by providing the suction unit 17 in all of the plurality of suction wells 12, the liquid in the tank unit 11 can be efficiently sucked out during normal times. Also, during a failure or maintenance, the redundancy of the suction unit 17 can be increased by sucking out the liquid by the suction pipe 18 and the pump 19 provided in at least one of the plurality of suction wells 12.

[0039] <Second Embodiment> Next, a second embodiment of the tank system and the floating body according to the present disclosure will be described. In the second embodiment described below, only the configuration of the tank system is different from that of the first embodiment, so the same parts as those in the first embodiment are denoted by the same reference numerals and described, and redundant descriptions are omitted.

[0040] FIG. 4 is a diagram showing the configuration of a tank system and a floating body according to an embodiment of the present disclosure. FIG. 5 is a diagram showing the configuration of a tank system according to a second embodiment of the present disclosure. As shown in FIGS. 4 and 5, the tank system 10B provided in the floating body 1 includes at least a tank portion 21, a suction well 12, a connecting pipe 15, and a suction portion 17. The tank system 10B of this second embodiment includes a plurality of tank portions 21 inside the floating body main body 2. In this second embodiment, the tank system 10B has, for example, two tank portions 21A and 21B. In this second embodiment, the two tank portions 21A and 21B are arranged side by side in the fore-and-aft direction FA, but it is not limited to this. The two tank portions 21A and 21B may be arranged side by side in the ship width direction Dw, for example.

[0041] As shown in FIG. 5, in this second embodiment, each of the tank portions 21A and 21B is formed in a cylindrical shape continuous in the fore-and-aft direction FA. Each of the tank portions 21A and 21B includes a cylindrical portion 214 and a bulkhead portion 215. The cylindrical portion 214 is provided at an intermediate portion of the tank portions 21A and 21B in the fore-and-aft direction FA and is formed in a cylindrical shape continuous in the fore-and-aft direction FA. The cylindrical portion 214 is formed in a circular cross-section when viewed from the direction along the axis O. The bulkhead portion 215 is provided at both ends of the cylindrical portion 214 in the fore-and-aft direction FA, respectively. Each bulkhead portion 215 is hemispherical and closes the openings at both ends of the cylindrical portion 214 in the fore-and-aft direction FA. An accommodation space S21 is formed in each of the tank portions 21A and 21B.

[0042] A concave surface portion 211d that is concave downward in the vertical direction Dv is provided below each of the tank portions 21A and 21B. That is, the tank portions 21A and 21B have a plurality of concave surface portions 211d. In each of the tank portions 21A and 21B, the concave surface portion 211d is formed at the bottom of the cylindrical portion 214 having a circular cross-section. In addition, in the cylindrical portion 214 continuous in the bow - stern direction FA, when viewed from the horizontal direction intersecting the axis O, the concave portion 211d may be slightly inclined in the bow - stern direction FA such that the position where the suction well 12 described later is provided becomes the lowermost part of the concave portion 211d, and is formed in a concave shape downward.

[0043] The plurality of suction wells 12 are provided in each of the tank portions 21A and 21B. The suction well 12 has a suction well 12C provided in the tank portion 21A and a suction well 12D provided in the tank portion 21B. The suction well 12C is provided at the lowermost part of the concave portion 211d of the tank portion 21A. The suction well 12C is formed by being recessed downward from the lowermost part (bottom) of the concave portion 211d. The suction well 12D is provided at the lowermost part of the concave portion 211d of the tank portion 21B. The suction well 12D is formed by being recessed downward from the lowermost part (bottom) of the concave portion 211d. Note that the suction well 12C and the suction well 12D in this second embodiment have the same shape as each other and are arranged at the same position in the vertical direction. However, it is not limited to this configuration. For example, the suction well 12C provided with the suction portion 17 may be arranged slightly lower than the suction well 12D.

[0044] The connecting pipe 15 connects the plurality of suction wells 12 to each other. In this second embodiment, the connecting pipe 15 connects the suction well 12C and the suction well 12D. One end of the connecting pipe 15 communicates with the inside of the suction well 12C. The other end of the connecting pipe 15 communicates with the inside of the suction well 12D. Through this connecting pipe 15, the inside of the suction well 12C and the inside of the suction well 12D communicate with each other.

[0045] The suction part 17 can suck the liquid in at least one of the plurality of suction wells 12 from the suction well 12. In this second embodiment, the suction part 17 is provided in, for example, the suction well 12C provided in the tank part 21A among the plurality of suction wells 12C and 12D. The suction part 17 can suck the liquid in the suction well 12C provided in the tank part 21A. Note that the suction part 17 in this second embodiment is not limited to being provided in one of the plurality of suction wells. For example, similar to the modification of the first embodiment, the suction part 17 may be provided in a plurality of suction wells to enhance redundancy (the same applies to the third embodiment below).

[0046] When the suction part 17 sucks up the liquid in the suction well 12C provided in the tank part 21A and the opening / closing part 153 is opened, the liquid in the suction well 12D flows into the suction well 12C through the connection pipe 15. Thereby, with one suction part 17, the liquid can be sucked out from the suction well 12C provided in one tank part 21A and the suction well 12D provided in the other tank part 21B. As the liquid in the tank parts 21A and 21B is sucked out to the outside of the tank parts 21A and 21B by the suction part 17, the level (liquid level) of the liquid in the tank parts 21A and 21B gradually decreases. Finally, the liquid remaining in the tank parts 21A and 21B accumulates in the suction wells 12C and 12D of the tank parts 21A and 21B. The liquid accumulated in the suction wells 12C and 12D is sent out from the suction well 12C to the outside of the tank part 21A by the suction part 17.

[0047] (Function and effect) According to the tank system 10B and the floating body 1 of the second embodiment above, in a configuration including a plurality of tank portions 21 (21A, 21B) provided with suction wells 12, since the suction well 12 of one tank portion 21 and the suction well 12 of another tank portion 21 are connected by a connecting pipe 15, the liquid accumulated in the plurality of suction wells 12 of the plurality of tank portions 21 can be sucked from the suction well 12 of one tank portion 21 provided with the suction portion 17 through the connecting pipe 15.

[0048] Also, in the second embodiment above, similar to the first embodiment, a plurality of suction wells 12 provided at the bottoms of the tank portions 21A and 21B are connected by a connecting pipe 15. The suction portion 17 can suck the liquid in the suction well 12 from at least one of the plurality of suction wells 12. Therefore, the liquid accumulated in the plurality of suction wells 12 can be sucked from at least one suction well 12 provided with the suction portion 17 through the connecting pipe 15. Therefore, it is not necessary to provide a suction portion 17 for each of the plurality of suction wells 12. As a result, even when a plurality of suction wells 12 are provided, a configuration capable of sucking the residual liquid in the suction well 12 can be realized at low cost.

[0049] <Third Embodiment> Next, a third embodiment of the tank system and the floating body according to the present disclosure will be described. In the third embodiment described below, only the configuration of the tank system is different from that of the first embodiment, so the same parts as those in the first embodiment will be denoted by the same reference numerals and described, and redundant descriptions will be omitted. FIG. 6 is a diagram showing the configuration of a tank system according to the third embodiment of the present disclosure. As shown in FIG. 6, the tank system 10C provided on the floating body 1 includes at least a tank portion 31, a suction well 12, a connecting pipe 15, and a suction portion 17. In this third embodiment, when a plurality of tank portions 31 are provided on the floating body 1, the tank system 10C is provided for each tank portion 31. In this third embodiment, the tank portion 31 is formed in a cylindrical shape continuous in the fore-and-aft direction FA. At the lower part of the tank portion 31, a concave surface portion 311d that forms a concave shape downward in the vertical direction Dv is provided. The concave surface portion 311d is formed at the bottom of the cylindrical portion 214 with a circular cross-section. In addition, in the cylindrical portion 214 continuous in the fore-and-aft direction FA, when viewed from the horizontal direction intersecting the axis O, the concave surface portion 311d may be inclined in the fore-and-aft direction FA and formed in a concave shape downward so that the positions where the suction wells 12 described later are provided are the lowermost portions of the concave surface portion 311d.

[0050] The plurality of suction wells 12 are provided in one tank portion 31. The suction well 12 has a suction well 12E provided below the concave surface portion 311d and a suction well 12F provided below the concave surface portion 312d. The suction well 12E is provided at the lowermost portion of the concave surface portion 311d. The suction well 12E is formed by being recessed downward from the lowermost portion (bottom) of the concave surface portion 311d. The suction well 12F is provided at the lowermost portion of the concave surface portion 312d. The suction well 12F is formed by being recessed downward from the lowermost portion (bottom) of the concave surface portion 312d. In addition, the suction well 12E and the suction well 12F in this third embodiment are exemplified as having the same shape as each other and being arranged at the same position in the vertical direction.

[0051] The connecting pipe 15 connects the plurality of suction wells 12 to each other. In this third embodiment, the connecting pipe 15 connects the suction well 12E and the suction well 12F provided in one tank portion 31. In addition, in this embodiment, the opening / closing portion 153 may be omitted.

[0052] The suction part 17 can suck the liquid in at least one of the plurality of suction wells 12 from the suction well 12. In this third embodiment, the suction part 17 is provided, for example, in one of the plurality of suction wells 12E and 12F. The suction part 17 can suck the liquid in the suction well 12E.

[0053] When the suction part 17 sucks up the liquid in the suction wells 12E and 12F provided in the tank part 31, when the opening / closing part 153 is opened, the liquid in the suction well 12F flows into the suction well 12E through the connection pipe 15. Thereby, with one suction part 17, the liquid accumulated in one suction well 12E and the other suction well 12F can be sucked out. As the liquid in the tank part 31 is sucked to the outside of the tank part 31 by the suction part 17, the level (liquid level) of the liquid in the tank part 31 gradually decreases. Finally, the liquid remaining in the tank part 31 accumulates in the suction wells 12E and 12F of the tank part 31. The liquid accumulated in the suction wells 12E and 12F is sent to the outside of the tank part 31 by the suction part 17.

[0054] (Function and effect) In the tank system 10C and the floating body 1 of the above third embodiment, in the configuration where a plurality of suction wells 12 are provided at the bottom of one tank part 31, the liquid accumulated in the plurality of suction wells 12 can be sucked from at least one suction well 12 provided with the suction part 17 through the connection pipe 15.

[0055] Also, in the above third embodiment, similar to the first and second embodiments, a plurality of suction wells 12 provided at the bottom of the tank portion 31 are connected to each other by a connecting pipe 15. Thereby, the liquid accumulated in the plurality of suction wells 12 can be sucked from at least one suction well 12 provided with a suction portion 17 through the connecting pipe 15. Therefore, it is not necessary to provide a suction portion 17 in each of the plurality of suction wells 12. As a result, even when a plurality of suction wells 12 are provided, a configuration capable of sucking the residual liquid in the suction well 12 can be realized at low cost.

[0056] (Other embodiments) As described above, the embodiments of the present disclosure have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes and the like within the scope not departing from the gist of the present disclosure are also included. For example, in each of the above embodiments, the case where two suction wells 12 are connected by a connecting pipe 15 has been exemplified. However, when three or more suction wells 12 are provided, the three or more suction wells 12 may be connected to each other by a connecting pipe 15. Further, in the above third embodiment, one tank portion 31 is provided with two suction wells 12, but three or more suction wells 12 may be provided. Also, the tank systems 10A to 10C are not limited to the floating body main body 2 of the floating body (ship) 1, and may be provided in the floating body main body of offshore floating facilities, onshore LNG storage facilities, and the like.

[0057] <Appendix> The tank systems 10A, 10B, 10C and the floating body 1 described in each embodiment are understood as follows, for example.

[0058] (1) The tank systems 10A, 10B, 10C according to the first aspect include a tank part 11, 21, 31 capable of storing a liquid therein, a plurality of suction wells 12 provided at the bottom of the tank parts 11, 21, 31 and recessed downward from the bottom, a connecting pipe 15 connecting the plurality of suction wells 12 to each other, and a suction part 17 capable of sucking the liquid in the suction well 12 from at least one of the plurality of suction wells 12.

[0059] As a result, the liquid accumulated in the plurality of suction wells 12 can be sucked from at least one suction well 12 provided with the suction part 17 through the connecting pipe 15. Therefore, it is not necessary to provide the suction part 17 in each of the plurality of suction wells 12. As a result, even when a plurality of suction wells 12 are provided, a configuration capable of sucking the remaining liquid in the suction well 12 can be realized at low cost.

[0060] (2) The tank systems 10A, 10B according to the second aspect are the tank systems 10A, 10B of (1), wherein the bottom of the tank parts 11, 21, 31 has a plurality of concave parts 111d, 112d that are concave downward, and the suction wells 12 are provided in each of the plurality of concave parts 111d, 112d.

[0061] As a result, in each of the plurality of concave parts 111d, 112d, the liquid remaining in the tank flows into the suction well 12. In this way, the liquid accumulated in the plurality of suction wells 12 can be sucked from at least one suction well 12 provided with the suction part 17 through the connecting pipe 15.

[0062] (3) The tank system 10B according to the third aspect is the tank system 10B of (1), wherein a plurality of the tank parts 21 provided with the suction wells 12 are provided, and the connecting pipe 15 connects the suction well 12 of one tank part 21 and the suction well 12 of another tank part 21.

[0063] As a result, the liquid accumulated in the plurality of suction wells 12 of the plurality of tank parts 21 can be sucked from the suction well 12 of at least one tank part 21 provided with the suction part 17 through the connection pipe 15.

[0064] (4) The tank system 10C according to the fourth aspect is the tank system 10C of (1), wherein a plurality of the suction wells 12 are provided in one of the tank parts 31.

[0065] As a result, in the configuration in which a plurality of suction wells 12 are provided at the bottom of one tank part 31, the liquid accumulated in the plurality of suction wells 12 can be sucked from at least one suction well 12 provided with the suction part 17 through the connection pipe 15.

[0066] (5) The tank systems 10A, 10B, 10C according to the fifth aspect are any one of the tank systems 10A, 10B, 10C of (1) to (4), wherein the liquid is liquefied gas, and further includes a heat insulating material 152 covering the connection pipe 15.

[0067] When liquefied gas flows in the connection pipe 15 connecting the plurality of suction wells 12, the connection pipe 15 is cooled by the liquefied gas that is at a lower temperature than the atmosphere. However, by covering the connection pipe 15 with the heat insulating material 152, dew condensation and freezing on the outer peripheral surface of the connection pipe 15 can be suppressed.

[0068] (6) The tank systems 10A, 10B, 10C according to the sixth aspect are any one of the tank systems 10A, 10B, 10C of (1) to (5), wherein the suction part 17 includes a suction pipe 18 having a lower end inserted into the suction well 12, and a pump 19 that sucks the liquid in the suction well 12 through the suction pipe 18.

[0069] As a result, the liquid flowing in from another suction well 12 through the connecting pipe 15 can be sucked out by the pump 19 through the suction pipe 18. In this way, it is possible to suppress the need to provide the suction pipe 18 and the pump 19 for all of the plurality of suction wells 12, and a configuration capable of sucking the residual liquid in the suction well 12 can be realized at low cost. Further, when all of the plurality of suction wells 12 are provided with the suction portion 17, normally, the liquid is sucked out by the suction pipe 18 and the pump 19 provided in at least one of the plurality of suction wells 12, and the suction pipe 18 and the pump 19 provided in the other suction wells 12 can be operated as a spare suction portion 17. Thereby, the redundancy of the suction portion 17 is increased.

[0070] (7) The tank systems 10A, 10B, 10C according to the seventh aspect are any one of the tank systems 10A, 10B, 10C of (1) to (6), and further include an opening / closing portion 153 that opens and closes the inside of the connecting pipe 15.

[0071] Thereby, when the liquid is not sucked by the suction portion 17, the flow of the liquid between the plurality of suction wells 12 through the connecting pipe 15 can be blocked by closing the opening / closing portion 153. Thereby, for example, when a plurality of tank portions 11 are provided, the opening / closing portion 153 can be closed and the plurality of tank portions 11 can be individually operated in a state where the liquid is not discharged from the inside of the tank portion 11. When discharging the liquid from the inside of the tank portion 11 of the liquid, by opening the opening / closing portion 153, the liquid accumulated in the plurality of suction wells 12 can be sucked from the suction well 12 of at least one tank portion 11 provided with the suction portion 17 through the connecting pipe 15.

[0072] (8) The floating body 1 according to the eighth aspect includes any one of the tank systems 10A, 10B, 10C of (1) to (7).

[0073] Accordingly, even when a plurality of suction wells 12 are provided, it is possible to provide the floating body 1 equipped with the tank systems 10A, 10B, and 10C that can realize, at low cost, a configuration capable of sucking the residual liquid in the suction well 12.

Explanation of Signs

[0074] 1... Floating body 2... Floating body main body 2b... Stern 3A, 3B... Side 4... Bottom of the ship 5... Upper deck 7... Superstructure 10A to 10C... Tank systems 11, 21, 21A, 21B, 31... Tank parts 12, 12A to 12F... Suction wells 15... Connecting pipe 17, 17A, 17B... Suction parts 18... Suction pipe 19... Pump 111... First body part 111d, 112d, 211d, 311d... Concave parts 112... Second body part 113... Third body part 114A to 114C, 214... Cylindrical parts 115A to 115C, 215... Mirror plates 152... Heat insulation material 153... Opening / closing part S1 to S3, S21... Accommodation space

Claims

1. A tank part capable of containing a liquid therein, a plurality of suction wells provided at the bottom of the tank part and recessed downward from the bottom, a connecting pipe connecting the plurality of suction wells to each other, a suction part capable of sucking the liquid in the suction well from at least one of the plurality of suction wells, A tank system comprising the above.

2. The bottom of the tank part has a plurality of concave parts that are concave downward, The suction well is provided in each of the plurality of concave parts. The tank system according to Claim 1.

3. The tank part provided with the suction well is provided in plurality, The connecting pipe connects the suction well of one tank part and the suction well of the other tank part. The tank system according to Claim 1.

4. A plurality of the suction wells are provided in one tank part. The tank system according to Claim 1.

5. The liquid is liquefied gas, The tank system further comprises a heat insulating material covering the connecting pipe. The tank system according to Claim 1 or 2.

6. The suction part comprises a suction pipe with the lower end inserted into the suction well, and a pump for sucking the liquid in the suction well through the suction pipe. The tank system according to Claim 1 or 2.

7. The tank system further comprises an opening / closing part for opening and closing the inside of the connecting pipe. The tank system according to Claim 1 or 2.

8. A floating body comprising the tank system according to Claim 1 or 2. ​

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