Marine vessel

Abstract

The purpose of this disclosure is to provide a marine vessel with which it is possible to find leakage of, e.g., liquefied hydrogen in double piping at an early stage. A marine vessel according to one embodiment of the present disclosure is provided with: double piping for transferring liquefied hydrogen or low-temperature hydrogen gas; and an inspection traffic path which extends along the double piping and through which an operator can pass.

Description

Ship 【0001】 This disclosure relates to a ship. 【0002】 Patent Document 1 below discloses an LNG carrier for transporting LNG (Liquefied Natural Gas). The LNG carrier is provided with pipes for transferring LNG. 【0003】 Japanese Unexamined Patent Application Publication No. 2006 - 63817 【0004】 Since LNG is at a very low temperature, generally, the pipes for transferring LNG are attached with heat insulation materials on the outside. On the other hand, for pipes transferring liquefied hydrogen or low - temperature hydrogen gas (hereinafter, "liquefied hydrogen etc.") which are even lower in temperature than LNG, if the same heat insulation materials as those for LNG pipes are used, not only is it unrealistic that the heat insulation materials have to be very thick, but also the difference in the shrinkage amounts of the heat insulation material and the pipe material at low temperatures becomes large, so the heat insulation material is likely to be damaged, and there is also concern about the dripping of liquefied air from the damaged parts. Therefore, in ships handling liquefied hydrogen etc., double - pipes are used to transfer liquefied hydrogen etc. 【0005】 Here, in the double - pipes for transferring liquefied hydrogen etc., if liquefied hydrogen etc. leaks from the inner pipe due to damage to the inner pipe, etc., there is concern that the leaked liquefied hydrogen etc. will cool the outer pipe and liquefied air or liquefied oxygen will be generated on the surface of the outer pipe. That is, by checking for the generation of liquefied air or liquefied oxygen on the surface of the outer pipe, it is possible to detect the leakage of liquefied hydrogen etc. in the double - pipes. 【0006】 Therefore, an object of this disclosure is to provide a ship that can detect early the leakage of liquefied hydrogen etc. in double - pipes. 【0007】 A ship according to one aspect of this disclosure includes double - pipes for transferring liquefied hydrogen or low - temperature hydrogen gas, and an inspection passage that extends along the double - pipes and through which an operator can pass. 【0008】 According to the ship according to one aspect of this disclosure, the leakage of liquefied hydrogen etc. in the double - pipes can be detected early. 【0009】Figure 1 is a schematic plan view of the ship. Figure 2 is a schematic side view of the ship. Figure 3 is a cross-sectional view and surrounding area of ​​the double piping. 【0010】 (Overall Configuration of the Vessel) The embodiments will be described below. First, the overall configuration of the vessel 100 will be described. Figure 1 is a schematic plan view of the vessel 100, and Figure 2 is a schematic side view of the vessel 100. The vessel 100 according to this embodiment is a vessel that handles liquefied hydrogen. More specifically, the vessel 100 is a liquefied hydrogen carrier that transports liquefied hydrogen. However, the vessel 100 may also be a liquefied hydrogen fuel vessel that uses liquefied hydrogen as fuel. 【0011】 In the following explanation, the concept of direction corresponds to the concept of direction when the ship 100 is facing the direction of propulsion (right side of the paper in Figures 1 and 2) at the center of the ship 100. For example, the right side of the paper in Figure 1 is "forward", the left side is "rear", the top of the paper is "left", and the bottom of the paper is "right". 【0012】 As shown in Figure 2, the vessel 100 according to this embodiment is equipped with four spherical tanks 20 located in the cargo area 11, which is the central part of the hull 10 in the longitudinal direction, and are arranged along the longitudinal direction. Liquid hydrogen is stored in each tank 20. The upper part of each tank 20 is filled with low-temperature hydrogen gas, which is the vaporized liquid hydrogen. The number and shape of the tanks 20 equipped in the vessel 100 are not limited. 【0013】 Furthermore, hemispherical tank covers 31 to 34 are provided on the upper deck 14 of the hull 10 to cover each tank 20. Hereinafter, these tank covers 31 to 34 will be referred to as the first tank cover 31, the second tank cover 32, the third tank cover 33, and the fourth tank cover 34, in order from front to back. A tank dome 35, to which various pipes and sensors are attached, is located at the top of each tank cover 31 to 34. 【0014】Furthermore, a living quarters 15 are located in the stern area 12, which is aft of the cargo area 11 of the hull 10. The living quarters 15 are located on the upper deck 14 and are structures where the crew of the ship 100 work and live. In addition, an engine room 17 is located in the stern area 12. The engine room 17 houses the engine 18 that drives the propeller 16 for propelling the hull 10. In this embodiment, the engine 18 uses hydrogen gas, which is vaporized liquefied hydrogen, as fuel, but the fuel for the engine 18 is not limited to hydrogen gas. 【0015】 Furthermore, the vessel 100 of this embodiment is equipped with a cargo equipment room 41 located between the third tank cover 33 and the fourth tank cover 34. The cargo equipment room 41 houses various cargo equipment 42. The cargo equipment 42 includes, for example, a cargo compressor, a cargo pump, and a cargo heat exchanger. The cargo equipment 42 pumps hydrogen gas or liquefied hydrogen stored in the tank 20 and uses it as fuel for the engine 18, etc. 【0016】 Furthermore, the vessel 100 of this embodiment has manifolds 43 located between the second tank cover 32 and the third tank cover 33, and on both the left and right sides of the hull 10. The manifolds 43 are equipment to which piping extending from external equipment or external vessels is connected. Through these manifolds 43, liquefied hydrogen and the like are supplied from external equipment or external vessels to each tank 20, and liquefied hydrogen and the like are supplied from each tank 20 to external equipment or external vessels. Vertically below the manifolds 43, there is a loading station 44, which is a space for connecting piping from external equipment or external vessels to the manifolds 43. 【0017】 Furthermore, the vessel 100 according to this embodiment is equipped with a double piping 50 for transporting liquefied hydrogen and the like. The thick lines in Figures 1 and 2 represent the double piping 50. The double piping 50 shown in Figures 1 and 2 may consist of only one double piping 50, or it may consist of multiple double pipings 50 extending parallel to each other. Also, the double piping 50 in this embodiment is located above the upper deck 14 of the hull 10. Therefore, the double piping 50 in this embodiment is exposed to the outside and is exposed to the outside air. 【0018】Furthermore, the vessel 100 according to this embodiment is equipped with an inspection access path 60 that workers can use. The shaded area in Figures 1 and 2 indicates the inspection access path 60. The inspection access path 60 in this embodiment, like the double piping 50, is located above the upper deck 14 of the hull 10. Therefore, the inspection access path 60 is exposed to the outside. The configuration of the double piping 50, the configuration of the inspection access path 60, and the surrounding configuration of the double piping 50 will be described in order below. 【0019】 (Double Piping Configuration) Next, the configuration of the double piping 50 will be explained. As shown in Figure 1, the double piping 50 includes a main pipe 51, cargo equipment room piping 52, and manifold piping 53. The main pipe 51 is a pipe that connects the tank pipes 54 extending from the tank domes 35 of each tank cover 31 to 34, and extends in the front-rear direction. The cargo equipment room piping 52 is a pipe that connects the main pipe 51 to the cargo equipment room 41. The manifold piping 53 is a pipe that connects the main pipe 51 to the left and right manifolds 43. 【0020】 Furthermore, as shown in Figure 2, the double piping 50 includes a horizontal piping section 55 that extends horizontally and an upper and lower piping section 56 that extends vertically. As shown in Figure 1, in this embodiment, the main piping 51, the portion of the cargo equipment room piping 52 that extends in the left-right direction, and the portion of the manifold piping 53 that extends in the left-right direction correspond to the horizontal piping section 55. Also, as shown in Figure 2, the portion of the cargo equipment room piping 52 that extends in the vertical direction and the portion of the manifold piping 53 that extends in the vertical direction correspond to the upper and lower piping section 56. 【0021】 Figure 3 is a cross-sectional view and a view of the surrounding area of ​​the double-walled piping 50. The double-walled piping 50 shown in Figure 3 is a horizontal piping section 55. As shown in Figure 3, the double-walled piping 50 has an inner pipe 57 that is in contact with liquefied hydrogen or the like, and an outer pipe 58 that covers the inner pipe 57. In this embodiment, the space between the inner pipe 57 and the outer pipe 58 is filled with air or an inert gas at a pressure lower than the ambient air pressure. In other words, the double-walled piping 50 in this embodiment is a vacuum double-walled piping. However, the double-walled piping 50 may also be configured so that air or an inert gas circulates in the space between the inner pipe 57 and the outer pipe 58. 【0022】If the inner pipe 57 is damaged or otherwise leaks liquefied hydrogen from a certain part of the inner pipe 57, the corresponding part of the outer pipe 58 will be cooled by the liquefied hydrogen. Also, if the double-walled piping 50 is a vacuum double-walled piping, if the vacuum in the double-walled piping 50 is lost due to damage to the outer pipe 58, the insulation performance of the double-walled piping 50 is lost, and the cold heat of the internal fluid, such as liquefied hydrogen, is transferred to the outer pipe 58, causing it to cool. When these malfunctions occur, liquefied air or liquefied oxygen is generated on the surface of the outer pipe 58, which has been cooled by the liquefied hydrogen. A worker located near the outer pipe 58 can visually confirm the liquefied air or liquefied oxygen generated on the surface of the outer pipe 58. Note that inspection of the double-walled piping 50 may also be performed using an inspection tool with a mirror or photographic device (camera, etc.) attached to the end of a rod. 【0023】 Furthermore, as shown in Figure 3, the horizontal piping section 55 of the double piping 50 is attached to the tank covers 31-34 via a support base 71. More specifically, the support base 71 is fixed to the tank covers 31-34, and the horizontal piping section 55 is fixed to the support base 71 using a U-shaped fastener 72. However, the double piping 50 may be attached to the hull 10 by a method other than that described above. For example, the double piping 50 may be attached to a structure other than the tank covers 31-34 located on the upper deck 14, rather than to the tank covers 31-34. 【0024】 (Configuration of the inspection access path) Next, the configuration of the inspection access path 60 will be described. As shown in Figure 1, the inspection access path 60 extends along the double piping 50. The inspection access path 60 has a horizontal access section 61 that extends along the horizontal piping section 55 of the double piping 50. In this embodiment, the horizontal access section 61 is formed of a flat plate-shaped member, and workers can walk on the upper surface of the horizontal access section 61. 【0025】 Furthermore, as shown in Figure 2, the inspection access path 60 has an access access section 62 that extends along the upper and lower piping sections 56 of the double piping 50. In this embodiment, the access access section 62 is a ladder, and workers can ascend and descend along the access access section 62. However, the access access section 62 may also be stairs or the like. 【0026】As described above, the vessel 100 according to this embodiment is equipped with an inspection passage 60 that extends along the double piping 50 and is passable by workers. Therefore, by passing through the inspection passage 60, workers can easily visually check for liquefied air and liquefied oxygen generated on the surface of the outer pipe 58, and as a result, leaks of liquefied hydrogen, etc., in the double piping 50 can be detected early. Furthermore, by accessing the double piping 50 from the inspection passage 60, workers can easily perform tests to identify the location of leaks when the outer pipe 58 is damaged, and vacuum evacuation work after repairs. 【0027】 Furthermore, as shown in Figures 1 and 2, the inspection access path 60 of this embodiment has a first access path 63 and a second access path 64 arranged so as to sandwich the double piping 50. In other words, the first access path 63 and the second access path 64 are arranged to extend in parallel. Furthermore, the first access path 63 has a first horizontal access path 65 (see Figure 1) that extends horizontally along the horizontal piping section 55 and a first vertical access path 66 (see Figure 2) that extends vertically along the vertical piping section 56. The second access path 64 has a second horizontal access path 67 (see Figure 1) that extends horizontally along the horizontal piping section 55 and a second vertical access path 68 (see Figure 2) that extends vertically along the vertical piping section 56. 【0028】 From another perspective, the first horizontal traffic section 65 and the second horizontal traffic section 67 are both horizontal traffic sections 61. Also, the first elevator traffic section 66 and the second elevator traffic section 68 are both elevator traffic sections 62. As shown in Figure 1, in this embodiment, the inspection traffic path 60 is connected to the living quarters 15 via the aft connecting passage 81, and is also connected to the upper deck 14 of the bow area 13, which is located forward of the cargo area 11, via the forward connecting passage 82. Therefore, workers can access the inspection traffic path 60 from either the aft area 12 or the bow area 13. 【0029】As mentioned above, the double piping 50 shown in Figure 3 is the horizontal piping section 55. The inspection traffic path 60 shown in Figure 3 is the first horizontal traffic section 65 and the second horizontal traffic section 67, which extend along the horizontal piping section 55. Here, as shown in Figure 3, the vertical plane passing through the central axis 73 of the horizontal piping section 55 is defined as the "center plane 74," and the two adjacent areas with this center plane 74 as the boundary are defined as the "first area 75" and the "second area 76," respectively. Thus, the first horizontal traffic section 65 is located in the first area 75, and the second horizontal traffic section 67 is located in the second area 76. 【0030】 Furthermore, as shown in Figure 3, the upper surface of the first horizontal traffic section 65 is located below the bottom surface of the horizontal piping section 55, and the upper surface of the second horizontal traffic section 67 is located below the bottom surface of the horizontal piping section 55. Thus, the vessel 100 according to this embodiment has a first horizontal traffic section 65 and a second horizontal traffic section 67 that are located at different positions relative to the horizontal piping section 55, and moreover, the upper surfaces of the first horizontal traffic section 65 and the second horizontal traffic section 67 are located below the bottom surface of the horizontal piping section 55. Therefore, by passing through the first horizontal traffic section 65 and the second horizontal traffic section 67, the worker can visually inspect the entire circumference of the horizontal piping section 55, including its bottom surface. Thus, according to this embodiment, leaks of liquefied hydrogen and the like in the double piping 50 can be detected with high accuracy. 【0031】 Furthermore, as shown in Figure 3, the horizontal traffic section 61 of this embodiment (i.e., the first horizontal traffic section 65 and the second horizontal traffic section 67) is attached to the tank covers 31-34 via a support base 71 and support legs 77. However, the horizontal traffic section 61 may be attached to the hull 10 by a method other than that described above. For example, the horizontal traffic section 61 may be attached to a structure other than the tank covers 31-34 located on the upper deck 14, rather than to the tank covers 31-34. 【0032】The above description has focused on the case where the inspection traffic path 60 is formed by two traffic paths (the first traffic path 63 and the second traffic path 64). However, a portion of the inspection traffic path 60 may be formed by two traffic paths, and the remaining portion by one traffic path. Alternatively, the entire inspection traffic path 60 may be formed by a single traffic path. In other words, the inspection traffic path 60 may be formed by only one of the first traffic path 63 and the second traffic path 64. 【0033】 (Peripheral configuration of the double piping) Next, the peripheral configuration of the double piping 50 will be described. As shown in Figure 3, the vessel 100 according to this embodiment is equipped with a connecting passage 80 and a drip tray 90. Note that the connecting passage 80 and the drip tray 90 are shown only in Figure 3, and are not shown in Figures 1 and 2. 【0034】 The connecting passage 80 is a passage that connects the first traffic channel 63 and the second traffic channel 64. The vessel 100 may have only one connecting passage 80, or it may have multiple connecting passages 80. The connecting passage 80 shown in Figure 3 illustrates the case where it connects the first horizontal traffic section 65 and the second horizontal traffic section 67; however, the connecting passage 80 may also connect the first elevator traffic section 66 and the second elevator traffic section 68. 【0035】 Furthermore, the connecting passage 80 shown in Figure 3 passes above the horizontal piping section 55 and connects the first horizontal traffic section 65 and the second horizontal traffic section 67. However, the connecting passage 80 may also pass below the horizontal piping section 55 and connect the first horizontal traffic section 65 and the second horizontal traffic section 67. Thus, since the vessel 100 according to this embodiment is equipped with a connecting passage 80, workers can easily move between the first traffic path 63 and the second traffic path 64. 【0036】The drip tray 90 is a component that receives liquefied air and liquefied oxygen when they fall onto the surface of the outer pipe 58 of the double piping 50. Because the ship 100 of this embodiment is equipped with the drip tray 90 described above, it is possible to prevent liquefied air and liquefied oxygen from falling onto the upper deck 14 of the hull 10 or structures on the upper deck 14. As a result, damage to the upper deck 14 and structures on the upper deck 14 caused by falling liquefied air and liquefied oxygen can be suppressed. 【0037】 As shown in Figure 3, the drip tray 90 is located vertically below the double piping 50. In this embodiment, the drip tray 90 is attached to the inspection passage 60. Furthermore, in the example shown in Figure 3, the drip tray 90 is attached to the first horizontal passage 65 and the second horizontal passage 67 so as to span across them. Therefore, according to the example shown in Figure 3, the drip tray 90 can be stably attached to an appropriate position. However, the drip tray 90 may be attached to only one of the first horizontal passage 65 and the second horizontal passage 67. Alternatively, the drip tray 90 may be attached to the double piping 50 so as to be suspended from it. 【0038】 (Summary) The first item disclosed herein is a vessel comprising a double piping for transporting liquefied hydrogen or low-temperature hydrogen gas, and an inspection access path extending along the double piping, through which workers can pass. 【0039】 With this configuration, workers can easily visually confirm liquefied air and liquefied oxygen generated on the surface of the outer pipe, and leaks of liquefied hydrogen, etc., in the double-walled piping system can be detected early. 【0040】 The second item disclosed herein is the vessel described in the first item, wherein the double piping includes a horizontally extending horizontal piping section, and the inspection traffic channel includes a horizontal traffic section extending horizontally along the horizontal piping section. 【0041】 This configuration allows for the early detection of leaks of liquefied hydrogen or other substances in the horizontal piping section. 【0042】The third item disclosed in this specification is the ship according to the second item, wherein the horizontal pipe section is located above the upper deck of the hull, and the horizontal traffic section is attached to a structure on the upper deck. 【0043】 According to this configuration, the horizontal traffic section can be attached along the horizontal pipe section located above the upper deck of the hull. 【0044】 The fourth item disclosed in this specification is the ship according to the second or third item, wherein the upper surface of the horizontal traffic section is located below the bottom surface of the horizontal pipe section. 【0045】 According to this configuration, an operator can visually check the bottom surface of the horizontal pipe by passing through the horizontal traffic section. Therefore, leaks such as liquefied hydrogen in the horizontal pipe section can be accurately detected. 【0046】 The fifth item disclosed in this specification is the ship according to any one of the first to fourth items, wherein the double pipe includes a vertical pipe section extending vertically, and the inspection traffic path includes a lifting and lowering traffic section extending vertically along the vertical pipe section. 【0047】 According to this configuration, leaks such as liquefied hydrogen in the vertically extending vertical pipe section can be detected at an early stage. 【0048】 The sixth item disclosed in this specification is the ship according to any one of the first to fifth items, wherein the inspection traffic path includes a first traffic path and a second traffic path extending in parallel with the first traffic path. 【0049】 According to this configuration, an operator can visually check the entire circumference of the double pipe by passing through the first traffic path and the second traffic path. Therefore, leaks such as liquefied hydrogen in the double pipe can be accurately detected. 【0050】The seventh item disclosed herein is the vessel described in item 6, wherein the double piping includes a horizontally extending horizontal piping section, the first traffic channel has a first horizontal traffic section extending horizontally along the horizontal piping section, the second traffic channel has a second horizontal traffic section extending horizontally along the horizontal piping section, the first horizontal traffic section is located in the first area of ​​an adjacent first and second area with a vertical central plane passing through the central axis of the horizontal piping section as the boundary, and the second horizontal traffic section is located in the second area. 【0051】 With this configuration, workers can efficiently visually inspect the entire circumference of the double-walled piping by passing through the first and second horizontal traffic sections. Therefore, leaks of liquefied hydrogen and other substances in the double-walled piping can be detected efficiently and accurately. 【0052】 The eighth item disclosed herein is the vessel described in item seven, wherein the upper surface of the first horizontal traffic section is located below the bottom surface of the horizontal piping section, and the upper surface of the second horizontal traffic section is located below the bottom surface of the horizontal piping section. 【0053】 With this configuration, workers can visually inspect the bottom surface of the horizontal piping by passing through the first and second horizontal traffic sections. Therefore, leaks of liquefied hydrogen or other substances in the horizontal piping can be detected with high accuracy. 【0054】 The ninth item disclosed herein is a vessel according to any one of the sixth to eighth items, which is equipped with a connecting passage between the first traffic route and the second traffic route. 【0055】 This configuration allows workers to move between the first and second traffic channels, enabling efficient inspection of the double piping system. 【0056】 The tenth item disclosed herein is a vessel according to any one of the first to ninth items, comprising a drip tray located vertically below the double piping. 【0057】With this configuration, when liquefied air or liquefied oxygen generated on the surface of the outer pipe of the double-walled piping falls, it can be caught by the drip tray. This prevents liquefied air or liquefied oxygen from falling onto the upper deck or structures on the upper deck of the ship, thereby reducing damage to the upper deck and structures on the upper deck. 【0058】 The eleventh item disclosed herein is the vessel described in item ten, wherein the drip tray is attached to the inspection traffic path. 【0059】 This configuration allows the drip tray to be stably mounted in the appropriate position. Furthermore, this configuration allows the drip tray or its support members to function as support members for the inspection pathway, enabling the inspection pathway to be positioned appropriately and reducing the amount of material by omitting support members that would otherwise need to be installed. 【0060】 The twelfth item disclosed herein is the vessel described in item seven, comprising a drip tray located vertically below the double piping, wherein at least a portion of the drip tray is attached to the first horizontal traffic section and the second horizontal traffic section so as to span the two horizontal traffic sections. 【0061】 This configuration allows the drip tray to be mounted more securely in the correct position. 【0062】 10 Hull 14 Upper Deck 31 First Tank Cover 32 Second Tank Cover 33 Third Tank Cover 34 Fourth Tank Cover 50 Double Piping 55 Horizontal Piping Section 56 Upper and Lower Piping Section 57 Inner Pipe 58 Outer Pipe 60 Inspection Access Channel 61 Horizontal Access Section 62 Elevator Access Section 63 First Access Channel 64 Second Access Channel 65 First Horizontal Access Section 66 First Elevator Access Section 67 Second Horizontal Access Section 68 Second Elevator Access Section 73 Central Axis 74 Central Plane 75 First Area 76 Second Area 80 Connecting Passage 90 Drip Tray 100 Ship

Claims

1. A vessel comprising a double piping system for transporting liquefied hydrogen or low-temperature hydrogen gas, and an inspection access path extending along the double piping system, through which workers can pass.

2. The vessel according to claim 1, wherein the double piping includes a horizontally extending horizontal piping section, and the inspection traffic channel includes a horizontal traffic section extending horizontally along the horizontal piping section.

3. The vessel according to claim 2, wherein the horizontal piping section is located above the upper deck of the hull, and the horizontal traffic section is attached to a structure on the upper deck.

4. The vessel according to claim 2, wherein the upper surface of the horizontal traffic section is located below the bottom surface of the horizontal piping section.

5. The vessel according to claim 1, wherein the double piping includes an upper and lower piping section extending vertically, and the inspection traffic channel includes an upper and lower traffic section extending vertically along the upper and lower piping section.

6. The vessel according to claim 1, wherein the inspection route includes a first route and a second route extending parallel to the first route.

7. The vessel according to claim 6, wherein the double piping includes a horizontally extending horizontal piping section, the first traffic channel has a first horizontal traffic section extending horizontally along the horizontal piping section, the second traffic channel has a second horizontal traffic section extending horizontally along the horizontal piping section, the first horizontal traffic section is located in the first area of ​​an adjacent first and second area with a vertical central plane passing through the central axis of the horizontal piping section as the boundary, and the second horizontal traffic section is located in the second area.

8. The vessel according to claim 7, wherein the upper surface of the first horizontal traffic section is located below the bottom surface of the horizontal piping section, and the upper surface of the second horizontal traffic section is located below the bottom surface of the horizontal piping section.

9. The vessel according to claim 6, further comprising a connecting passage between the first traffic route and the second traffic route.

10. The vessel according to claim 1, further comprising a drip tray located vertically below the double piping.

11. The vessel according to claim 10, wherein the drip tray is attached to the inspection traffic path.

12. The vessel according to claim 7, comprising a drip tray located vertically below the double piping, wherein at least a portion of the drip tray is attached to the first horizontal traffic section and the second horizontal traffic section so as to span the two horizontal traffic sections.

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