vessel

Abstract

A ship (1) includes a hull (2) and a ship piping (3) for a low-temperature fluid laid on the hull (2). A hydraulic drive type valve (4) is provided on the ship piping (3). A tray (7) for receiving working oil leaked from the valve (4) is arranged above the hull (2) and below the valve (4). According to this structure, in the case where the working oil is leaked from the valve (4), the working oil is received by the tray (7).

Description

Technical Field

[0001] This disclosure relates to ships that include onboard piping for cryogenic fluids. Background Technology

[0002] In the past, for example, in ships such as liquefied gas transport ships, onboard piping for cryogenic fluids was installed on the hull (for example, see Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-202783 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] However, sometimes hydraulically actuated valves are installed on ship piping. In such cases, if the working oil leaks from the valve, it can sometimes flow down the hull into the sea.

[0008] Therefore, the purpose of this disclosure is to provide a vessel capable of preventing the working oil from leaking into the sea in the event of leakage from a hydraulically driven valve.

[0009] Methods for solving problems

[0010] To address the aforementioned issues, the vessel disclosed herein is characterized by having: a hull; onboard piping for cryogenic fluids, disposed on the hull; a hydraulically actuated valve disposed on the onboard piping; and a tray disposed above the hull and below the valve for receiving working oil leaking from the valve.

[0011] Invention Effects

[0012] According to this disclosure, it is possible to prevent the working oil from flowing into the sea in the event of leakage from a hydraulically driven valve. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of a portion of a vessel according to one embodiment of this disclosure. Detailed Implementation

[0014] Figure 1 A vessel 1 is shown as an embodiment of the present disclosure. The vessel 1 includes a hull 2 ​​and onboard piping 3 for cryogenic fluids arranged on the hull 2.

[0015] In this embodiment, the cryogenic fluid is a liquefied gas. For example, the liquefied gas is liquefied petroleum gas (LPG, approximately -45°C), liquefied ethylene gas (LEG, approximately -100°C), liquefied natural gas (LNG, approximately -160°C), liquefied oxygen (LO2, approximately -180°C), liquefied hydrogen (LH2, approximately -250°C), or liquefied helium (LHe, approximately -270°C).

[0016] However, cryogenic fluids do not necessarily have to be liquefied gases; they can also be other liquids. Alternatively, cryogenic fluids can also be gases.

[0017] For example, vessel 1 is a liquefied gas transporter. In this case, one or more cargo oil tanks are mounted on the hull 2, and onboard piping 3 is a cargo pipe extending from these cargo oil tanks.

[0018] Shipboard piping 3 can also be a double-layered pipe with an insulation layer formed between the inner and outer pipes. The insulation layer can be, for example, a vacuum layer, a simulated vacuum layer, a powder layer filled with a powder with low thermal conductivity, or a gas layer filled with a gas with low thermal conductivity. Alternatively, shipboard piping 3 can also be a single-layered pipe wound with insulation material. Double-layered pipes with a vacuum layer or a simulated vacuum layer are suitable for extremely low-temperature liquefied hydrogen, while other double-layered pipes or single-layered pipes wound with insulation material are suitable for LNG, which has a higher temperature compared to liquefied hydrogen.

[0019] The end of the ship's piping 3 is provided with a connector 31 for connecting to other equipment piping 9. Other equipment piping 9 may be, for example, land equipment piping or fuel supply pipes for fuel supply ships.

[0020] exist Figure 1 In the diagram, the left-right direction represents the ship's width, and the direction perpendicular to the plane of the paper represents the ship's length. In this embodiment, near the end of the ship's piping 3, the ship's piping 3 extends along the ship's width direction.

[0021] A liquid receiving unit 5 is disposed above the hull 2. The liquid receiving unit 5 is used to receive liquefied gas flowing out from the end of the ship's piping 3 when the ship's piping 3 is urgently disconnected from other equipment piping 9 via connector 31. In the event of emergency disconnection, although the ship's piping 3 is cut off by a shut-off valve (not shown), a portion of the liquefied gas remaining in the ship's piping 3 from the shut-off valve to the end flows out.

[0022] The liquid receiving section 5 includes a bottom wall 51 and a peripheral wall 52 rising from the periphery of the bottom wall 51. For example, the liquid receiving section 5 is rectangular in shape when viewed from above. However, the liquid receiving section 5 may also be circular in shape when viewed from above.

[0023] Extending from the liquid receiving section 5 is a marine discharge pipe 6 for discharging the liquefied gas received by the liquid receiving section 5 into the ocean. In this embodiment, the marine discharge pipe 6 includes a vertical section extending downward from the liquid receiving section 5 and a discharge section that extends laterally from the lower end of the vertical section and then bends downward.

[0024] A valve 61 is provided at the vertical part of the marine disposal pipe 6, and a rotary joint 62 is provided below the valve 61. The rotary joint 62 is used to enable the disposal part of the marine disposal pipe 6 to rotate. The valve 61 can be manual or electric.

[0025] That is, when valve 61 is closed, the discharge section of the ocean discharge pipe 6 is located on the hull 2 ​​in a manner parallel to the ship's length direction. When valve 61 is opened to discharge liquefied gas into the ocean, the discharge section of the ocean discharge pipe 6 is rotated so that it extends from the hull 2 ​​toward the ocean.

[0026] A hydraulically actuated valve 4 is installed on the ship's piping 3. That is, the valve 4 is opened and closed by switching on and off the supply of working fluid to the valve 4. In this embodiment, the valve 4 is located near the connector 31 in the ship's piping 3.

[0027] A tray 7 is positioned above the hull 2 ​​and below the valve 4. The tray 7 is used to receive working oil leaking from the valve 4.

[0028] In this embodiment, valve 4 is positioned horizontally away from liquid receiving section 5 (in this embodiment, it is positioned inside liquid receiving section 5 in the width direction). Furthermore, tray 7 is positioned higher than liquid receiving section 5, and partially overlaps with liquid receiving section 5 when viewed from above.

[0029] More specifically, the tray 7 is rectangular when viewed from above, and includes: a base plate 71; a back plate 72, which is located on the side opposite to the liquid receiving section 5 relative to the valve 4 (in this embodiment, it is located on the inside side of the valve 4 in the ship width direction); and a pair of side plates 73, which are located on both sides of the valve 4 in a horizontal direction perpendicular to the axial direction of the ship piping 3 (in this embodiment, it is located in the ship length direction).

[0030] Furthermore, in this embodiment, the tray 7 includes a weir 8 disposed on the base plate 71. The weir 8 is located between the valve 4 and the liquid receiving section 5, and extends along the length of the ship in a manner that connects the side plates 73 to each other. The height of the weir 8 is set to be lower than the height of the back plate 72 and the side plates 73.

[0031] In the vessel 1 with the structure described above, in the event of leakage of working oil from valve 4, the working oil is received by tray 7. Therefore, it is possible to prevent the working oil from flowing into the sea along the hull 2.

[0032] Furthermore, in this embodiment, due to the use of the liquid receiving unit 5 and the marine discharge pipe 6, when the ship's piping 3 is urgently disconnected from other equipment piping 9, the liquefied gas flowing from the end of the ship's piping 3 is received by the liquid receiving unit 5. Therefore, it is possible to prevent the liquefied gas, as a cryogenic fluid, from affecting the hull 2. The liquefied gas received by the liquid receiving unit 5 is discharged into the ocean through the marine discharge pipe 6, so the leaked liquefied gas is not stored on the ship but is safely discharged into the ocean.

[0033] Furthermore, in this embodiment, since the tray 7 includes a weir 8 and the tray 7 partially overlaps with the liquid receiving section 5, when liquefied gas leaks from the valve 4, if the amount of liquefied gas is small, the leaking liquefied gas is blocked by the weir 8 of the tray 7 and evaporates on the tray 7. Conversely, if the amount of liquefied gas is large, the leaking liquefied gas crosses the weir 8 and flows into the liquid receiving section 5, and is then discharged into the ocean through the marine discharge pipe 6. On the other hand, when working oil leaks from the valve 4, the amount of working oil is not large. Therefore, the leaking working oil is blocked by the weir 8 and will not flow into the ocean. In this way, depending on the height of the weir 8, it is possible to store both working oil and liquefied gas flowing into the liquid receiving section.

[0034] (Modified Example)

[0035] This disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of this disclosure.

[0036] For example, the tray 7 does not necessarily need to be positioned higher than the liquid receiving section 5; the tray 7 can also be arranged laterally with the liquid receiving section 5. In this case, the shape of the tray 7 can also be funnel-shaped (circular when viewed from above). Alternatively, the tray 7 can also be integrally provided with the liquid receiving section 5 by separating a portion of the liquid receiving section 5 with a partition.

[0037] Alternatively, if the cryogenic fluid flowing in the ship's piping 3 is a gas, then the liquid receiving section 5 may not be required, and the valve 4 may be located at any position on the ship's piping 3.

[0038] (Summarize)

[0039] The vessel disclosed herein is characterized in that it has: a hull; onboard piping for cryogenic fluids, which is arranged on the hull; a hydraulically actuated valve, which is disposed on the onboard piping; and a tray, which is disposed above the hull and below the valve, for receiving working oil leaking from the valve.

[0040] According to the above structure, in the event of leakage of working oil from the valve, the working oil is received by the tray. Therefore, it is possible to prevent the working oil from flowing into the sea along the hull.

[0041] Alternatively, the cryogenic fluid can be liquefied petroleum gas (LPG). The ship's piping is equipped with a connector at its end for connection to other equipment piping. The ship also includes: a liquid receiving unit located above the hull, for receiving LPG flowing from the end of the ship's piping in an emergency when the piping is disconnected from other equipment piping via the connector; and a marine discharge pipe for discharging the LPG received by the liquid receiving unit into the ocean. According to this structure, when the ship's piping is disconnected from other equipment piping in an emergency, the LPG flowing from the end of the ship's piping is received by the liquid receiving unit. Therefore, it is possible to prevent the LPG, as a cryogenic fluid, from affecting the hull. The LPG received by the liquid receiving unit is discharged into the ocean via the marine discharge pipe, thus preventing leaked LPG from being stored on the ship and safely discharged into the ocean.

[0042] For example, the valve may be positioned horizontally away from the liquid receiving section, and the tray may be positioned higher than the liquid receiving section, partially overlapping with the liquid receiving section when viewed from above.

[0043] Alternatively, the tray may include: a base plate; a back plate located on the side opposite to the liquid receiving section relative to the valve; a pair of side plates located on either side of the valve; and a weir located between the valve and the liquid receiving section, the height of the weir being lower than the height of the back plate and the pair of side plates. According to this structure, in the event of liquefied gas leakage from the valve, when the amount of liquefied gas is small, the leaking liquefied gas is blocked by the weir of the tray and evaporates on the tray. Conversely, when the amount of liquefied gas is large, the leaking liquefied gas flows over the weir into the liquid receiving section and is then discharged into the ocean through the marine discharge pipe. On the other hand, in the event of working oil leakage from the valve, the amount of working oil is not large. Therefore, the leaking working oil is blocked by the weir and will not flow into the ocean. Thus, depending on the height of the weir, it is possible to both store working oil and allow liquefied gas to flow into the liquid receiving section.

[0044] For example, it could also be that the aforementioned vessel is a liquefied gas transport vessel, and the aforementioned onboard piping is a cargo pipe.

[0045] For example, the aforementioned shipboard piping could be a double-layered pipe with an insulation layer formed between the inner and outer pipes.

Claims

1. A ship having: hull; The ship's piping for liquefied gas is laid on the hull, and the ends of the ship's piping are provided with joints for connecting to other equipment piping. A hydraulically actuated valve is installed in the ship's piping; A tray, positioned above the hull and below the valve, is used to receive working oil leaking from the valve; A liquid receiving unit, disposed above the hull, is used to receive liquefied gas flowing from the end of the ship's piping when the ship's piping is urgently disconnected from the piping of the other equipment via the joint; as well as A marine discharge pipe, used to discharge liquefied gas received by the liquid receiving unit into the ocean. The valve is positioned horizontally away from the liquid receiving section. The tray is positioned higher than the liquid receiving section and partially overlaps with the liquid receiving section when viewed from above.

2. The vessel according to claim 1, wherein, The tray contains: Base plate; A backplate, which is located on the side opposite to the liquid receiving section relative to the valve; A pair of side plates located on both sides of the valve; and A weir, located between the valve and the liquid receiving section, The height of the weir is lower than the height of the back plate and the pair of side plates.

3. The vessel according to claim 1 or 2, wherein, The vessel in question is a liquefied gas transport ship. The piping on the ship is cargo piping.

4. The vessel according to claim 1 or 2, wherein, The shipboard piping is a double-layered pipe with an insulation layer formed between the inner and outer pipes.

5. The vessel according to claim 3, wherein, The shipboard piping is a double-layered pipe with an insulation layer formed between the inner and outer pipes.

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