Cryogenic fluid transfer piping unit

Abstract

Provided is a piping unit (1) for cryogenic fluid transfer, the piping unit comprising: double piping (3) having an inner pipe (15) through which cryogenic fluid is passed, and an outer pipe (17) that covers the outside of the inner pipe (15) and forms a first vacuum insulation layer (19) together with the inner pipe (15); single piping (5) that is separate from the double piping (3); and a shutoff valve (7) that connects the double piping (3) and the single piping (5), wherein the piping unit is provided with a cover (11) that covers a portion of the single piping (5) that protrudes from a valve box (9) of the shutoff valve (7), the cover (11) forming a second vacuum insulation layer (21) together with the single piping (5).

Description

Technical Field

[0001] The present disclosure relates to a piping unit used for transporting cryogenic fluids.

Background Art

[0002] Conventionally, as piping for transporting liquefied gases such as liquefied natural gas and liquefied hydrogen, it has been proposed to use a double-structured vacuum-insulated pipe (see, for example, Patent Document 1). Since this double pipe has a structure in which an inner pipe is covered with an outer pipe via a heat-insulating layer, high heat insulation can be obtained, and the temperature rise of the low-temperature liquefied gas flowing in the inner pipe can be effectively suppressed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0006] To achieve the above objective, the cryogenic fluid transfer piping unit relating to this disclosure is A double-walled pipe having an inner tube through which a cryogenic fluid passes, and an outer tube that covers the outside of the inner tube and forms a first vacuum insulation layer between it and the inner tube, A single-walled pipe connected to one end of the inner pipe, A shut-off valve interposed between the double piping and the single piping, wherein the double piping is connected to its primary side and the single piping is connected to its secondary side, A cover that covers the portion of the shut-off valve exposed from the valve body in the single-walled piping and forms a second vacuum insulation layer between it and the single-walled piping, It is equipped with.

[0007] Any combination of at least two configurations disclosed in the claims and / or the specification and / or drawings is included in this disclosure. In particular, any combination of two or more of each claim in the claims is included in this disclosure. [Brief explanation of the drawing]

[0008] This disclosure will be better understood from the following description of preferred embodiments with reference to the accompanying drawings. However, the embodiments and drawings are for illustrative and explanatory purposes only and should not be used to define the scope of this disclosure. The scope of this disclosure is defined by the claims attached. In the accompanying drawings, the same reference numerals in multiple drawings indicate the same or corresponding parts. [Figure 1] This is a longitudinal cross-sectional view showing a schematic configuration of a cryogenic fluid transfer piping unit according to one embodiment of the present disclosure. [Figure 2A] Figure 1 is a longitudinal cross-sectional view showing a schematic configuration of a modified example in which the cover configuration differs. [Figure 2B] Figure 1 is a longitudinal cross-sectional view showing a schematic configuration of another modified example with a different cover configuration. [Figure 3]This is a longitudinal cross-sectional view showing a schematic configuration of a cryogenic fluid transfer piping unit according to one modified embodiment of Figure 1, in which a cover is provided with a cover expansion / contraction allowance. [Figure 4] This is a magnified longitudinal cross-sectional view showing an example of the shape of the cover used in another modification of the embodiment shown in Figure 1. [Figure 5] This is a longitudinal cross-sectional view showing a schematic configuration of a cryogenic fluid transfer piping unit according to another modified embodiment of Figure 1. [Figure 6] This is a longitudinal cross-sectional view showing a schematic configuration of a cryogenic fluid transfer piping unit according to another modified embodiment of Figure 1. [Modes for carrying out the invention]

[0009] Embodiments of the present disclosure will be described below with reference to the drawings. Figure 1 shows a cryogenic fluid transfer piping unit 1 according to one embodiment of the present disclosure. Hereinafter, this cryogenic fluid transfer piping unit 1 will be simply referred to as "piping unit 1". Piping unit 1 is applied when a double pipe and a single pipe employing a vacuum insulation structure are connected. Piping unit 1 comprises a double pipe 3, a single pipe 5 separate from the double pipe 3, a shut-off valve 7 connecting the double pipe 3 and the single pipe 5, and a cover 11 that covers the portion of the shut-off valve 7 exposed from the valve body 9 in the single pipe 5.

[0010] Piping unit 1 is used in liquefied gas storage facilities, such as liquefied gas storage vessels and onshore liquefied gas storage bases. In this specification, "liquefied gas storage vessel" refers to a ship that has the function of storing liquefied gas. In addition to liquefied gas carriers, other types of vessels such as liquefied gas fuel ships and bunkering ships that supply liquefied gas to other ships are also included in the definition of liquefied gas storage vessel. However, liquefied gas storage facilities are not limited to ships, as long as they have the structure and function of storing liquefied gas, they may also be onshore liquefied gas storage facilities or plants that utilize liquefied gas.

[0011] As shown in Figure 1, the double-walled pipe 3 is configured as a vacuum-insulated pipe with a double-walled structure. Specifically, the double-walled pipe 3 consists of an inner pipe 15 through which cryogenic fluid passes and an outer pipe 17 that covers the outside of the inner pipe 15. A first vacuum insulation layer 19 is formed in the radial gap between the inner pipe 15 and the outer pipe 17.

[0012] The cryogenic fluids transported by the double-walled piping 3 are, for example, liquefied gases such as liquefied nitrogen (LN2, approximately -200°C), liquefied hydrogen (LH2, approximately -250°C), and liquefied helium (LHe, approximately -270°C). In this embodiment, liquefied hydrogen is transported via the double-walled piping 3. However, the cryogenic fluids as used herein include not only liquefied gases but also cryogenic vaporized gases generated from liquefied gases. The piping unit 1 of this disclosure can be applied to equipment that transports not only liquefied gases but also cryogenic vaporized gases.

[0013] The single-walled pipe 5 is connected to one end of the inner pipe 15. The single-walled pipe 5 is used to transport a relatively hot fluid, such that no liquefied oxygen is generated on the pipe surface. A shut-off valve 7 is interposed between the double-walled pipe 3 and the single-walled pipe 5. In the typical operation of the piping unit 1, where cryogenic fluid is flowed from the double-walled pipe 3 side to the single-walled pipe 5 side, the double-walled pipe 3 is connected to the primary side of the shut-off valve 7, and the single-walled pipe 5 is connected to the secondary side. However, in the following explanation, for convenience, the side of the shut-off valve 7 to which the double-walled pipe 3 is connected will be referred to as the primary side, and the side to which the single-walled pipe 5 is connected will be referred to as the secondary side.

[0014] Specifically, the double pipe 3 and the single pipe 5 are connected to the valve box 9 of the shut-off valve 7. The valve box 9 and the double pipe 3 and the single pipe 5 are joined by welding. However, the joining method between the valve box 9 and the pipes 3 and 5 is not limited to welding, and any method such as flange connection or screw connection can be used. Inside the valve box 9, a valve body for shutting off or adjusting the flow rate, a valve shaft for operating the valve body, etc. are arranged. The shut-off valve 7 shuts off the cryogenic fluid flowing in the double pipe 3 from flowing into the single pipe 5 side. In the present embodiment, a ball valve is used as the shut-off valve 7, but any type of valve can be adopted as needed.

[0015] Since the primary side of the shut-off valve 7 is in contact with the cryogenic fluid in the double pipe 3, the cold heat from this cryogenic fluid is transmitted, and the portion around the shut-off valve 7 of the shut-off valve 7 and the single pipe 5 on its secondary side is cryogenically cooled. Here, "cryogenic cooling" of the pipe surface means that the temperature of the pipe surface becomes extremely low. When the pipe surface is cryogenically cooled, if this pipe is exposed to the outside air, the generation of liquefied oxygen may occur. For example, the generation of liquefied oxygen can occur on the pipe surface at -183°C or lower.

[0016] In the present embodiment, a cover 11 is provided that covers the portion of the single pipe 5 exposed from the valve box 9 of the shut-off valve 7 and forms a second vacuum heat insulation layer 21 between it and the single pipe 5. Also on the secondary side of the shut-off valve 7, a second vacuum heat insulation layer 21 is formed between the single pipe 5 and the cover 11. Specifically, the shut-off valve 7 of the present embodiment includes a vacuum jacket 23 that covers the valve box 9, and the cover 11 is formed by the single pipe side end portion 23a of the vacuum jacket 23 and a cylindrical member 25 connected to this single pipe side end portion 23a. That is, in this example, one end of the vacuum jacket 23 on the single pipe 5 side extends beyond the valve box 9 in the axial direction to the single pipe side, and the cover 11 is formed by the single pipe side end portion 23a, which is a part of the vacuum jacket 23 that extends beyond the valve box 9, and the cylindrical member 25.

[0017] In this way, by covering the portion of the single pipe 5 that extends a predetermined length from the valve box of the shut-off valve 7 with the cover 11, it is possible to suppress the exposure of the cryogenic portion of the single pipe to the outside air. Further, by making the space between the single pipe 5 and the cover 11 a vacuum heat insulation layer 21, heat transfer from the single pipe 5 to the cover 11 can be suppressed and the cryogenic cooling of the cover 11 can be prevented. Thereby, the generation of liquefied oxygen on the single pipe 5 side can be prevented.

[0018] The cylindrical member 25 constituting the cover 11 can be configured, for example, as a single pipe disposed outside the single pipe 5. When the cylindrical member 25 is configured as a single pipe, for example, the cylindrical member 25 can be formed as a single pipe having the same material and / or pipe diameter as the outer pipe 17 of the double pipe 3. The end of the cylindrical member 25 on the side opposite to the shut-off valve 7 is closed by a lid portion 25a. In the illustrated example, the cylindrical member 25 has a substantially cylindrical shape. Note that the cylindrical member 25 may be composed of a plurality of, for example, two split cylinders, or may be composed of three or more split cylinders. Further, the shape of the cylindrical member 25 is not limited to a cylindrical shape, and may be another cylindrical shape such as a square cylindrical shape.

[0019] Note that in this specification, the "cover 11" refers to an element that covers the portion of the single pipe 5 that is exposed from the valve box 9 of the shut-off valve 7 and forms a second vacuum heat insulation layer 21 between itself and the single pipe 5, regardless of the aspect of the element covering the single pipe 5, the specific form of the vacuum jacket 23 in the example of FIG. 1, and / or the positional relationship between the vacuum jacket 23 and the cylindrical member 25. As described above, in the present embodiment shown in FIG. 1, the cover 11 is formed by the single pipe side end portion 23a of the vacuum jacket 23 and the cylindrical member 25. In this example, the end of the cylindrical member 25 on the side opposite to the shut-off valve 7 is closed by the lid portion 25a.

[0020] As one modification of this embodiment, for example, as shown in Figure 2A, if the single-pipe side end 23a of the vacuum jacket 23 extends for a long distance, in other words, if the vacuum jacket 23 and the cylindrical member 25 in Figure 1 are integrally formed, the cover 11 is formed by the single-pipe side end 23a of the vacuum jacket 23 in Figure 2A. The end of the single-pipe side end 23a opposite to the shut-off valve 7 is closed by the lid portion 23b of the vacuum jacket 23. Also, as shown in Figure 2B as another modification, if the cylindrical member 25 is provided so as to cover the single-pipe side end 23a of the vacuum jacket 23, the covering portion 25b of the cylindrical member 25 that covers the exposed portion of the single pipe 5 becomes the cover 11.

[0021] In this embodiment shown in Figure 1, the first vacuum insulation layer 19 and the second vacuum insulation layer 21 are in communication. Specifically, the first vacuum insulation layer 19 and the second vacuum insulation layer 21 are in communication through the space between the valve body 9 of the shut-off valve 7 and the vacuum jacket 23. If a partition wall is provided between these vacuum insulation layers 19 and 12, the partition wall may be deeply cooled by heat transfer from the cryogenic fluid on the primary side of the shut-off valve 7, and as a result, the surface of the cover 11 connected to the partition wall may be deeply cooled. Therefore, by configuring the first and second vacuum insulation layers 19 and 21 to be in communication, the deep cooling of the cover 11 can be suppressed. In addition, the vacuum evacuation of the first vacuum insulation layer 19 and the second vacuum insulation layer 21 can be performed simultaneously using a common vacuum pump, and vacuum management is also easy. However, it is not essential that the first vacuum insulation layer 19 and the second vacuum insulation layer 21 are in communication.

[0022] In this embodiment, as shown in Figure 1, the axial length L1 of the cover 11 is longer than the length L2 from the axial position P of the fluid communication blocking portion on the double piping side of the shut-off valve 7 to the axial end 9a of the valve body 9 on the single piping side. In this specification, the "fluid communication blocking portion" may differ depending on the specific structure of the shut-off valve 7, but for example, in the case of the globe valve described above, it is the downstream end of the primary flow path when the valve body is closed. In the illustrated example, the axial position P is shown as being approximately in the center of the axial direction of the valve body 9, but it may be a different position depending on the specific structure of the shut-off valve 7. The axial length L1 of the cover 11 may be, for example, 250 mm or more. With this configuration, the cover 11 can cover the portion of the single piping 5 that is sufficiently far from the position P which is the starting point of deep cooling, and the generation of liquid oxygen due to deep cooling of the piping surface can be prevented more reliably. However, the axial length L1 of the cover 11 is not limited to this example.

[0023] In the piping unit 1 according to this embodiment, as shown in Figure 1, the single pipe 5 is provided with a pipe expansion / contraction allowance section 31 in the portion covered by the cover 11 that allows for changes in the axial length. In this embodiment, the single pipe 5 has a bellows as the pipe expansion / contraction allowance section 31. In addition to changes in the axial length of the single pipe 5, the pipe expansion / contraction allowance section 31 may also be configured to allow, for example, radial displacement. This configuration suppresses the generation of high stress at the connection portion between the single pipe 5 and the cover 11, thereby suppressing deformation and damage. Furthermore, by providing a pipe expansion / contraction allowance section 31 such as a bellows, the heat transfer distance of the inner pipe 5 inside the cover 11 is increased, so the transfer of cold and heat to the outside of the cover 11 can be suppressed more effectively.

[0024] However, the expansion / contraction allowance portion that allows changes in axial length can be provided on at least one of the cover 11 and the portion of the single pipe 5 covered by the cover 11. In a modified example of this embodiment, as shown in Figure 3, the cover 11 may be provided with a cover expansion / contraction allowance portion 33 that allows changes in axial length. In this modified example, the cover 11 has a bellows as the cover expansion / contraction allowance portion 33. Similar to the pipe expansion / contraction allowance portion 31, the cover expansion / contraction allowance portion 33 may be configured to allow displacement in the radial direction, in addition to changes in the axial length of the cover 11. The cover expansion / contraction allowance portion 33 is effective in allowing thermal contraction of the inner pipe 15 and absorbing the difference in thermal contraction between the inner and outer pipes. With this configuration, it is possible to suppress the generation of high stress at the connection portion between the single pipe 5 and the cover 11, thereby suppressing deformation and damage. Providing such an expansion / contraction allowance portion on the cover 11 makes inspection easier than providing it on the single pipe 5 covered by the cover 11.

[0025] In the above explanation, examples were shown separately for a single pipe 5 having a pipe expansion / contraction allowance 31 and a cover 11 having a cover expansion / contraction allowance 33. However, the piping unit 1 may have both a pipe expansion / contraction allowance 31 and a cover expansion / contraction allowance 33. Furthermore, both the pipe expansion / contraction allowance 31 and the cover expansion / contraction allowance 33 may be omitted.

[0026] As shown in Figure 4 as another modified example, the shape of the cover 11 may have a curved shape on the lid portion 25a opposite to the valve body 9. Specifically, in the illustrated example, the lid portion 25a is curved so as to smoothly decrease in diameter from the peripheral wall of the cover 11 toward the single pipe 5. By giving the lid portion 25a of the cover 11 such a shape, it is possible to alleviate stress concentration applied to the connection portion between the single pipe 5 and the cover 11 due to expansion and contraction of the single pipe 5, for example. Although Figure 3 shows an example in the piping unit 1 shown in Figure 1 in which the lid portion 25a of the cover 11 has the curved shape described above instead of providing the pipe expansion and contraction allowance portion 31, the lid portion 25a of the cover 11 may also have the curved shape described above in addition to providing either or both of the pipe expansion and contraction allowance portion 31 and the cover expansion and contraction allowance portion 33.

[0027] In this embodiment, as shown in Figure 1, the piping unit 1 is equipped with a temperature measuring instrument 35 for measuring the temperature of the single pipe 5. The temperature measuring instrument 35 is equipped with a temperature sensor element 35a for detecting the temperature of the object to be detected, and the temperature sensor element 35a is positioned at the end 5a of the single pipe 5 that is covered by the cover 11. With this configuration, by measuring the temperature of the single pipe 5 at the end 5a that is closest to the part of the single pipe 5 that is not covered by the cover 11, it is possible to reliably determine that the part not covered by the cover 11 is not undergoing deep cooling. However, it is not essential to provide the temperature measuring instrument 35 in the piping unit 1.

[0028] In addition to the temperature sensor element 35a, the temperature measuring instrument 35 may also be equipped with various circuits that perform necessary processing such as signal conversion processing and calculation processing on the acquired detected amount, a memory for storing information necessary for these processes, a power supply element such as a battery or a power supply circuit for receiving power from an external source, and a transmission circuit for transmitting the output signal to the outside by wire or wireless connection, in appropriate locations.

[0029] In another modified piping unit 1 of this embodiment, as shown in Figure 5, an additional shut-off valve 37 may be provided in the portion of the single pipe 5 exposed from the cover 11. By providing the additional shut-off valve 37 downstream of the shut-off valve 7 in the direction of cryogenic fluid flow, the flow of cryogenic fluid can be shut off more reliably.

[0030] In another modified piping unit 1 of this embodiment, as shown in Figure 6, the portion of the single pipe 5 exposed from the cover 11 may be covered with an insulating material 39. This configuration allows for proper insulation of the single pipe 5 when cryogenic fluid is temporarily flowed from the double pipe 5 to the single pipe 5. The area covered by the insulating material 39 can be arbitrarily determined according to the temperature of the pipe surface, etc. As the insulating material 39, for example, a vacuum insulation panel can be used. The insulating material 39 may be a powder rather than a panel-shaped member. The material used as the insulating material 39 is not particularly limited, but may be an organic polymer material such as polyurethane foam or polyethylene foam, or an inorganic material such as perlite.

[0031] Furthermore, the additional shut-off valve 37 shown in Figure 5 and the heat insulating material 39 shown in Figure 6 can be arbitrarily combined with any of the modified configurations described above.

[0032] In addition to those described above, the piping unit 1 may be equipped with various valves and measuring instruments as needed. For example, a vacuum gauge may be installed at any point communicating with the second vacuum insulation layer 21 formed by the cover 11.

[0033] In this embodiment, as described above, the piping unit 1 is used for transferring liquefied hydrogen. Since liquefied hydrogen has a lower temperature than liquefied oxygen, there are significant advantages to using the piping unit 1 described above. However, as described above, the piping unit 1 according to this embodiment can be used for transferring substances other than liquefied hydrogen.

[0034] The piping unit 1 according to the first aspect of this embodiment described above comprises a double pipe 3 having an inner pipe 15 through which cryogenic fluid passes, and an outer pipe 17 that covers the outside of the inner pipe 15 and forms a first vacuum insulation layer 19 between itself and the inner pipe 15; a single pipe 5 separate from the double pipe 3; a shut-off valve 7 connecting the double pipe 3 and the single pipe 5; and a cover 11 that covers the portion of the single pipe 5 exposed from the valve body 9 of the shut-off valve 7 and forms a second vacuum insulation layer 21 between itself and the single pipe 5. With this configuration, the cover 11 covers the portion of the single pipe 5 extending a predetermined length from the valve body of the shut-off valve 7, thereby preventing the deeply cooled portion of the single pipe from being exposed to the outside air. Furthermore, by making the space between the single pipe 5 and the cover 11 a vacuum insulation layer 21, heat transfer from the single pipe 5 to the cover 11 can be suppressed, preventing the cover 11 from becoming deeply cooled. This prevents the generation of liquefied oxygen on the single pipe 5 side.

[0035] In the second aspect of this embodiment, the piping unit 1 may have the first vacuum insulation layer 19 and the second vacuum insulation layer 21 in communication with each other, as in the piping unit according to the first aspect. With this configuration, deep cooling on the secondary side of the shut-off valve 7 can be suppressed, and the vacuum evacuation of the first vacuum insulation layer 19 and the second vacuum insulation layer 21 can be performed using a common vacuum pump, making vacuum management easy.

[0036] In the third aspect of this embodiment, the piping unit 1 may have a axial length L1 of the cover 11 that is longer than the length L2 from the axial position P of the fluid communication blocking portion on the double piping 3 side of the shut-off valve 7 to the axial end 9a of the valve body 9 on the single piping 5 side. With this configuration, the cover 11 can cover the portion of the single piping 5 that is sufficiently far from the position P which is the starting point of deep cooling, thereby more reliably preventing the generation of liquid oxygen due to deep cooling of the piping surface.

[0037] The piping unit 1 according to the fourth aspect of this embodiment may be provided with an expansion / contraction allowance portion that allows changes in axial length, i.e., the cover expansion / contraction allowance portion 33 and / or the pipe expansion / contraction allowance portion 31, in at least one of the cover 11 and the portion of the single pipe 5 covered by the cover 11, in addition to the piping unit according to any of the first to third aspects. This configuration suppresses the generation of high stress at the connection portion between the single pipe 5 and the cover 11, thereby suppressing deformation and damage. Furthermore, if the pipe expansion / contraction allowance portion 31 is provided, the heat transfer distance in the single pipe 5 increases, so the transfer of cold and heat to the outside of the cover 11 can be suppressed more effectively.

[0038] In the fifth aspect of this embodiment, the piping unit 1 may be provided with an additional shut-off valve 37 in the portion of the single pipe 5 exposed from the cover 11, as in the piping unit according to any of the first to fourth aspects. This configuration allows for more reliable shut-off of the cryogenic fluid flow.

[0039] In the sixth aspect of this embodiment, the piping unit 1 may have a temperature sensor element 35a for detecting the temperature of the single pipe 5 positioned at the end of the portion of the single pipe 5 covered by the cover 11, as in the piping unit according to any of the first to fifth aspects. With this configuration, by measuring the temperature of the single pipe 5 at the end 5a closest to the portion of the single pipe 5 not covered by the cover 11, it is possible to reliably determine that the portion not covered by the cover 11 is not undergoing deep cooling.

[0040] As described above, preferred embodiments of the present disclosure have been explained with reference to the drawings, but various additions, modifications, or deletions are possible without departing from the spirit of the present disclosure. Therefore, such additions, modifications, or deletions are also included within the scope of the present disclosure. [Explanation of Symbols]

[0041] 1. Piping unit for cryogenic fluid transfer 3. Double piping 5 Single piping 5a End of single-layer piping 7. Shut-off valve 9 Valve box 11 Cover 15 Inner tube 17 Outer tube 19. First vacuum insulation layer 21. Second vacuum insulation layer 23 Vacuum Jacket 23a Single pipe side end 23b Vacuum jacket lid 25 Cylindrical member 25a Lid portion of cylindrical member 25b Covered part 31. Expansion allowance for piping (Expansion allowance) 33 Cover stretchable portion (stretchable portion) 35 Temperature measuring instruments 35a Temperature sensor element 37 Additional shut-off valves 39. Insulation L1 Cover axial length L2 valve body dimensions for single piping P shut-off valve, fluid communication shut-off portion on the double piping side

Claims

1. A double-walled pipe having an inner tube through which a cryogenic fluid passes, and an outer tube that covers the outside of the inner tube and forms a first vacuum insulation layer between it and the inner tube, The aforementioned double piping and a separate single piping, A shut-off valve connecting the double piping and the single piping, A cover that covers the portion of the shut-off valve exposed from the valve body in the single-walled piping and forms a second vacuum insulation layer between it and the single-walled piping, A piping unit for cryogenic fluid transfer equipped with the following features.

2. In the cryogenic fluid transfer piping unit according to claim 1, The first vacuum insulation layer and the second vacuum insulation layer are in communication with each other. Piping unit for cryogenic fluid transfer.

3. In the cryogenic fluid transfer piping unit according to claim 1 or 2, The axial length of the cover is longer than the length from the axial position of the fluid communication blocking portion on the double piping side of the shut-off valve to the axial end of the valve body on the single piping side. Piping unit for cryogenic fluid transfer.

4. In the cryogenic fluid transfer piping unit according to claim 1 or 2, At least one of the cover and the portion of the single pipe covered by the cover is provided with an expandable / contractable portion that allows for changes in axial length. Piping unit for cryogenic fluid transfer.

5. In the cryogenic fluid transfer piping unit according to claim 1 or 2, An additional shut-off valve is provided in the portion of the single-walled pipe exposed from the cover. Piping unit for cryogenic fluid transfer.

6. In the cryogenic fluid transfer piping unit according to claim 1 or 2, A temperature sensor element for detecting the temperature of the single pipe is positioned at the end of the portion of the single pipe that is covered by the cover. Piping unit for cryogenic fluid transfer.

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