Liquid transfer device

Abstract

To provide a liquid transfer device that can prevent a pump from sucking a gas.SOLUTION: A liquid transfer device 1 for transferring a liquefied gas includes a gas contamination prevention device 20 for recovering bubbles generated from a liquefied gas before a pump 11 sucks the bubbles.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a liquid transfer device. [Background technology]

[0002] A pot-type pump connected to a pipe extending from a liquefied gas tank is known as a pump for transferring low-temperature liquefied gas. Such a pot-type pump is configured to transfer the liquefied gas in the liquefied gas tank by operating it. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-240986 A [Patent Document 2] JP 2014-134142 A [Patent Document 3] JP 2011-247575 A [Patent Document 4] JP 2018-199116 A Summary of the Invention [Problem to be solved by the invention]

[0004] Liquefied gas has a very low boiling point. Therefore, some of the liquefied gas may vaporize due to external heat input or other factors. The vaporized gas (in other words, bubbles) is called boil-off gas (BOG). If gas is generated upstream of the pump suction port in the flow direction of the liquefied gas, the gas may be sucked into the pump suction port together with the liquefied gas. The gas sucked into the pump suction port may cause a decrease in pump performance.

[0005] Liquefied gas has a very low boiling point. Therefore, a part of the liquefied gas may vaporize due to external heat input or other factors. If an additional configuration (e.g., a vortex prevention member) is provided in contact with an external room temperature area to prevent the pump from sucking in air (gas) as in Patent Document 2 (i.e., JP 2014-134142 A), the external heat input to the liquid transfer device increases, and more vaporized gas is generated. If a lot of gas is generated, the pump is more likely to suck in the gas, which is more likely to cause a decrease in pump performance.

[0006] SUMMARY OF THE PRESENT EMBODIMENTS It is therefore an object of the present invention to provide a liquid transfer device that prevents gas from being sucked into a pump. [Means for solving the problem]

[0007] In one aspect, a liquid transfer device is provided, comprising: a pump that sucks in liquefied gas from below and transfers it upward; a vertical pipe in which the pump is disposed; a horizontal pipe that supplies liquefied gas to a position in the vertical pipe below the pump; and a gas contamination prevention device that is supported by the pump and isolated from the vertical pipe, and that collects air bubbles generated from the liquefied gas before the air bubbles are sucked into the pump.

[0008] In one aspect, the gas entrapment prevention device includes a plate-shaped member extending downward along the side of the pump from the side facing the vertical piping, and the tip of the plate-shaped member extends toward the horizontal piping. In one aspect, the plate-like member forms an air bubble flow path through which the air bubbles flow between the vertical pipe and the plate-like member. In one embodiment, the plate-like member has a bent portion bent toward the upstream side of the horizontal pipe midway along the plate-like member.

[0009] In one embodiment, the gas entrapment prevention device comprises a funnel-shaped member suspended from the suction port of the pump for collecting the air bubbles. In one aspect, the funnel has a diameter greater than a diameter of the inlet. In one embodiment, the gas entrapment prevention device includes a gas exhaust pipe connected to the funnel-shaped member. In one aspect, the gas entrapment prevention device includes a guide member arranged on the horizontal pipe, and the guide member generates a swirling flow of the liquefied gas by narrowing the flow of the liquefied gas flowing through the horizontal pipe. Effect of the Invention

[0010] During pump operation, some of the liquefied gas transported from the liquefied gas tank to the pump suction port may vaporize and form bubbles. The gas entrapment prevention device can prevent the pump from sucking in air bubbles by collecting the air bubbles generated from the liquefied gas in the vertical pipe before they are sucked into the pump.

[0011] The gas mixing prevention device is provided in the pump device but is not connected to the vacuum double pipe. Therefore, the heat outside the inner tube of the vacuum double pipe, i.e., the external heat, is not transferred from the vacuum double pipe to the gas mixing prevention device, and the gas generated from the liquefied gas can be separated and the intake of air bubbles by the pump can be prevented. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 illustrates one embodiment of a liquid transfer device. [Diagram 2] FIG. 2 is a schematic diagram showing a pump device. [Diagram 3] FIG. 3(a) is a diagram showing a gas intrusion prevention device having a bent tip, and FIG. 3(b) is a diagram showing a gas intrusion prevention device having a tip extending parallel to the base end. [Figure 4] 4(a) to 4(c) are diagrams showing an example of a gas intrusion prevention device when a vertical pipe is viewed from the extending direction of the vertical pipe. [Diagram 5] FIG. 13 is a diagram showing another embodiment of the gas intrusion prevention device. [Figure 6]6 is a diagram showing the gas mixing prevention device shown in FIG. 5 when the vertical pipe is viewed from the extending direction of the vertical pipe. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the same or corresponding components are denoted by the same reference numerals, and duplicated description thereof will be omitted.

[0014] Fig. 1 is a diagram showing one embodiment of a liquid transfer device. The liquid transfer device 1 is configured to transfer a cryogenic liquefied gas (e.g., liquefied hydrogen). As shown in Fig. 1, the liquid transfer device 1 includes a vacuum double pipe 2 and a pump device 10 disposed in the vacuum double pipe 2.

[0015] The vacuum double pipe 2 has a horizontal pipe 2A extending horizontally, a vertical pipe 2C extending vertically, and an elbow pipe 2B connecting the horizontal pipe 2A and the vertical pipe 2C. Each of the horizontal pipe 2A, the elbow pipe 2B, and the vertical pipe 2C has an outer cylinder and an inner cylinder, and a vacuum is formed between the outer cylinder and the inner cylinder. The vacuum double pipe 2 having such a structure can suppress the heat input to the liquefied gas flowing through the vacuum double pipe 2 and the vaporization of the liquefied gas due to external heat input.

[0016] The pump device 10 is disposed inside the vertical pipe 2C, and the horizontal pipe 2A and the elbow pipe 2B are disposed below the pump device 10. The horizontal pipe 2A supplies liquefied gas to a position below the pump device 10 (more specifically, the pump 11) in the vertical pipe 2C. In the embodiment shown in FIG. 1, a suction pipe 3 is connected to the horizontal pipe 2A. For example, the suction pipe 3 is connected to a liquefied gas tank (not shown). By operating the pump device 10, the liquefied gas in the liquefied gas tank flows into the vacuum double pipe 2 through the suction pipe 3. The liquefied gas flowing through the horizontal pipe 2A and the elbow pipe 2B is sucked into the pump device 10 disposed in the vertical pipe 2C.

[0017] 1, a discharge nozzle 19 is connected to the pump device 10, and a discharge pipe 4 is connected to the discharge nozzle 19. Therefore, the liquefied gas sucked into the pump device 10 is transported to the outside through the discharge nozzle 19 and the discharge pipe 4.

[0018] In this way, the liquid transfer device 1 of the type that sucks in the liquefied gas flowing through the horizontal pipe 2A and elbow pipe 2B arranged below the pump device 10 may be called a bottom suction pot type pump. Unlike a general pot type pump system (i.e., a type of pump system in which the suction pipe cannot be attached to the bottom of the suction pot), the bottom suction pot type pump can be fitted with a large diameter suction pipe 3 and can transfer a large flow rate of liquefied gas with low pressure loss.

[0019] Fig. 2 is a schematic diagram showing a pump device. As shown in Fig. 2, the pump device 10 includes a pump 11 disposed inside a vertical pipe 2C and a motor 12 that drives the pump 11. For example, the pump device 10 is a submerged motor pump.

[0020] The pump 11 includes a plurality of impellers 16 fixed to a rotating shaft 17, and a pump casing 18 that houses the plurality of impellers 16. In the embodiment shown in Fig. 2, a plurality of impellers 16 are arranged, but at least one impeller 16 may be arranged. The pump casing 18 has a suction bell mouth 15 arranged below the plurality of impellers 16 (more specifically, the first stage), and the suction bell mouth 15 has a suction port 15a that opens downward.

[0021] The motor 12 includes a rotor 21 fixed to the rotating shaft 17, a stator 22 surrounding the rotor 21, and a motor casing 23 accommodating the rotor 21 and the stator 22. The rotor 21 and the stator 22 constitute rotating elements.

[0022] When power is supplied to the motor 12, the rotating shaft 17 and the multiple impellers 16 rotate together with the rotor 21, and the liquefied gas is introduced into the inside of the pump device 10 through the suction port 15a of the suction bell mouth 15. The liquefied gas that has passed through the pump device 10 is transported to the outside through the discharge nozzle 19 and the discharge pipe 4 (see FIG. 1).

[0023] When the liquefied gas flowing through the vacuum double pipe 2 vaporizes, gas (in other words, air bubbles) is generated within the vacuum double pipe 2. In particular, when gas is generated in the horizontal pipe 2A, the gas may be sucked into the pump 11 through the suction bell mouth 15. In this case, the performance of the pump 11 may be reduced due to the suction of the gas. Therefore, the liquid transfer device 1 is provided with a gas mixing prevention device 20 that isolates the gas generated from the liquefied gas flowing through the horizontal pipe 2A (and the elbow pipe 2B) from the suction port 15a.

[0024] The gas mixing prevention device 20 is supported by the pump 11, isolated from the vertical pipe 2C, and is configured to collect gas generated from the liquefied gas within the vertical pipe 2C before the gas is sucked into the pump 11.

[0025] 1 and 2, the gas entrainment prevention device 20 includes a plate-like member extending along the vertical pipe 2C toward the lower side of the suction port 15a. More specifically, the gas entrainment prevention device 20 as a plate-like member has a base end 20a connected to the suction bell mouth 15 and extending parallel to the vertical pipe 2C, and a tip end 20b extending downward from the base end 20a. In this embodiment, the base end 20a and the tip end 20b are integrally molded members, but may be formed from separate members.

[0026] The gas mixing prevention device 20 as a plate-like member extends downward along the inner inner surface 2Ca from the side of the pump 11 facing the inner inner surface 2Ca of the vertical pipe 2C (i.e., the side surface of the vertical pipe). The tip 20b of the gas mixing prevention device 20 extends toward the horizontal pipe 2A.

[0027] The gas mixing prevention device 20 forms a gas flow path (in other words, a bubble flow path) A1 through which gas flows between the vertical pipe 2C and the gas mixing prevention device 20 (a plate-shaped member in this embodiment). In other words, the gas mixing prevention device 20 divides the space of the vertical pipe 2C into a space (gas flow path A1) through which gas generated from the liquefied gas flows, and a space (liquid flow path) A2 through which the liquefied gas flows.

[0028] According to this embodiment, the gas mixing prevention device 20 can cause the gas generated from the liquefied gas to flow into the gas flow path A1, while causing the liquefied gas to flow into the liquid flow path A2. The suction port 15a of the suction bell mouth 15 is disposed in the liquid flow path A2. Therefore, the liquefied gas flowing through the liquid flow path A2 is sucked into the suction port 15a, and the gas flowing through the gas flow path A1 rises up the vertical pipe 2C without being sucked into the suction port 15a. As a result, the gas mixing prevention device 20 can prevent the gas from being sucked into the pump 11.

[0029] Gas generated from the liquefied gas flowing through the horizontal pipe 2A (or the suction pipe 3) is collected at the top of the horizontal pipe 2A due to its buoyancy. The gas that has collected at the top of the horizontal pipe 2A flows along the inner curved surface 2Ba of the elbow pipe 2B and the inner inner surface 2Ca of the vertical pipe 2C, separated from the liquefied gas (see Figure 1).

[0030] The horizontal pipe 2A has a length that allows gas (i.e., bubbles) generated from the liquefied gas to be collected at the top of the horizontal pipe 2A. The length of the horizontal pipe 2A is determined based on factors such as the type of liquefied gas to be transferred and the flow rate of the liquefied gas. By ensuring a sufficient length of the horizontal pipe 2A, the gas can be reliably separated from the liquefied gas, and the gas mixing prevention device 20 arranged on the inner inner surface 2Ca side of the vertical pipe 2C can more effectively isolate the gas from the liquefied gas.

[0031] The inner curved surface 2Ba of the elbow pipe 2B is a portion with a small radius of curvature among the bent portions of the elbow pipe 2B. The inner inner surface 2Ca of the vertical pipe 2C is a portion connected to the inner curved surface 2Ba. The gas mixing prevention device 20 is disposed opposite the inner inner surface 2Ca. Therefore, the gas flow path A1 is formed between the inner inner surface 2Ca of the vertical pipe 2C and the gas mixing prevention device 20. With this configuration, the gas flowing along the inner curved surface 2Ba and the inner inner surface 2Ca is reliably introduced into the gas flow path A1.

[0032] In order to more effectively isolate the gas from the liquefied gas, it is preferable that the tip of the tip portion 20b extends to below the vertical pipe 2C. More preferably, the tip of the tip portion 20b extends to a position midway through the horizontal pipe 2A. More specifically, when the horizontal pipe 2A is viewed from the direction in which the horizontal pipe 2A extends, the tip of the tip portion 20b extends to the center of the horizontal pipe 2A. In other words, the tip of the tip portion 20b does not reach the bottom of the vacuum double pipe 2. With this configuration, the gas mixing prevention device 20 can cause the gas to flow into the gas flow path A1 while suppressing pressure loss and causing the liquefied gas to flow into the liquid flow path A2.

[0033] The gas entrainment prevention device 20 is connected to the pump device 10 (the pump 11 in this embodiment) but is not connected to the vacuum double pipe 2. When the gas entrainment prevention device 20 is connected to the vacuum double pipe 2 (for example, the upper part of the horizontal pipe 2A), the gas entrainment prevention device 20 captures gas generated on the upstream side of the horizontal pipe 2A. However, in this case, there is a possibility that heat outside the inner cylinder of the vacuum double pipe 2, i.e., external heat, is transmitted to the gas entrainment prevention device 20 through the vacuum double pipe 2.

[0034] When external heat is transmitted to the gas entrainment prevention device 20, the temperature of the gas entrainment prevention device 20 rises, and as a result, gas may be generated around the gas entrainment prevention device 20. If gas is generated downstream of the gas entrainment prevention device 20, the gas entrainment prevention device 20 will not be able to capture the gas, and as a result, the gas may flow into the suction port 15a of the suction bell mouth 15.

[0035] According to this embodiment, by connecting the gas entrainment prevention device 20 to the pump device 10, it is possible to prevent gas generation around the gas entrainment prevention device 20, and as a result, gas generation is prevented downstream of the gas entrainment prevention device 20. Therefore, the above-mentioned problems do not occur.

[0036] Fig. 3(a) is a diagram showing a gas mixing prevention device having a bent tip, and Fig. 3(b) is a diagram showing a gas mixing prevention device having a tip extending parallel to a base end. As shown in Fig. 3(a), the gas mixing prevention device 20 has a bent portion 20c bent on the upstream side of the horizontal pipe 2A (i.e., the suction pipe 3 side) in the middle.

[0037] The bent portion 20c is disposed between the base end portion 20a and the tip end portion 20b, and is bent obliquely downward toward the inner curved surface 2Ba (or the horizontal pipe 2A). With such a shape, the tip end portion 20b can reliably capture the gas flowing through the horizontal pipe 2A and the elbow pipe 2B, and can more reliably prevent the gas from passing through the gas mixing prevention device 20 and flowing toward the liquid flow path A2.

[0038] In one embodiment, the gas entrainment prevention device 20 may not have the bent portion 20c depending on the shape of the vacuum double pipe 2, the flow rate of the liquefied gas, and other conditions. As shown in Fig. 3(b), the gas entrainment prevention device 20 may have a tip portion 20b extending parallel to the base end portion 20a. In this case, the gas entrainment prevention device 20 extends in parallel to the vertical pipe 2C as a whole.

[0039] 4(a) to 4(c) are diagrams showing an example of a gas intrusion prevention device when a vertical pipe is viewed from the direction in which the vertical pipe extends. In the embodiment shown in FIG. 4(a) and FIG. 4(c), when the vertical pipe 2C is viewed from the direction in which the vertical pipe 2C extends, the gas intrusion prevention device 20 has a base end 20a having a curved shape. In the embodiment shown in FIG. 4(b), when the vertical pipe 2C is viewed from the direction in which the vertical pipe 2C extends, the gas intrusion prevention device 20 has a base end 20a having a straight shape.

[0040] In the embodiment shown in Fig. 4(a), the base end 20a has an arc shape that follows the outer shape of the suction bell mouth 15. In the embodiment shown in Fig. 4(c), the base end 20a is curved in the opposite direction to the outer shape of the suction bell mouth 15.

[0041] Fig. 5 is a diagram showing another embodiment of the gas mixing prevention device. In the embodiment shown in Fig. 5, the gas mixing prevention device 20 includes a funnel-shaped member 25 that collects gas generated from the liquefied gas, and a hanging member 27 that hangs the funnel-shaped member 25 from the suction port 15a of the suction bell mouth 15.

[0042] The funnel-shaped member 25 is disposed below the suction port 15a and has a structure that isolates the gas from the suction port 15a. The funnel-shaped member 25 has a diameter larger than the diameter of the suction port 15a. By disposing the funnel-shaped member 25 below the suction port 15a, the funnel-shaped member 25 captures (collects) the gas rising in the vertical pipe 2C.

[0043] By trapping the gas in the funnel-shaped member 25, the liquefied gas not containing gas (gas bubbles) ascending in the vertical pipe 2C is sucked into the suction port 15a disposed above the funnel-shaped member 25. In the embodiment shown in Fig. 5, the funnel-shaped member 25 has a conical shape, but the shape of the funnel-shaped member 25 is not particularly limited as long as it can trap the gas.

[0044] 5, the gas mixing prevention device 20 may include a gas exhaust pipe 26 connected to a funnel-shaped member 25. The gas exhaust pipe 26 extends parallel to the vertical pipe 2C, and is configured to exhaust the gas collected in the funnel-shaped member 25 to the outside.

[0045] The gas entrainment prevention device 20 is connected to the pump device 10 (in this embodiment, the suction bell mouth 15), but is not connected to the vacuum double pipe 2. When the gas entrainment prevention device 20 is connected to the vacuum double pipe 2 (for example, the inner surface 2Ca of the vertical pipe 2C), the gas entrainment prevention device 20 captures gas generated upstream of the horizontal pipe 2A. However, in this case, there is a possibility that heat outside the inner cylinder of the vacuum double pipe 2, i.e., external heat, will be transmitted to the gas entrainment prevention device 20 through the vacuum double pipe 2.

[0046] When external heat is transmitted to the gas entrainment prevention device 20, the temperature of the gas entrainment prevention device 20 rises, and as a result, gas may be generated around the gas entrainment prevention device 20. If gas is generated downstream of the gas entrainment prevention device 20, the gas entrainment prevention device 20 cannot capture the gas, and as a result, the gas may flow into the suction port 15a of the suction bell mouth 15.

[0047] Fig. 6 is a diagram showing the gas mixing prevention device shown in Fig. 5 when the vertical pipe is viewed from the extending direction of the vertical pipe. As shown in Fig. 6, the gas mixing prevention device 20 may include a guide member 30 arranged in the horizontal pipe 2A. The guide member 30 is configured to generate a swirling flow in the vertical pipe 2C by narrowing the flow of liquefied gas flowing through the horizontal pipe 2A. The guide member 30 is arranged auxiliary, and can more actively collect gas generated from the liquefied gas in the funnel-shaped member 25.

[0048] As shown in Fig. 6, the guide member 30 includes an inclined plate 30a arranged at an angle with respect to the extension direction of the horizontal pipe 2A, and a plurality of mounting members 30b for mounting the inclined plate 30a to the horizontal pipe 2A. The number of mounting members 30b is not limited to this embodiment. In the embodiment shown in Fig. 6, the inclined plate 30a is arranged on one side of the horizontal pipe 2A by the mounting members 30b, but it may be arranged on the other side (opposite surface).

[0049] The flow velocity of the liquefied gas flowing through the horizontal pipe 2A is determined by dividing the flow rate of the liquefied gas by the cross-sectional area of ​​the horizontal pipe 2A. Therefore, under the condition that the flow rate of the liquefied gas is constant, if the cross-sectional area of ​​the horizontal pipe 2A is small, the flow velocity of the liquefied gas will be high. The guide member 30 reduces the cross-sectional area of ​​the horizontal pipe 2A (i.e., the flow path of the liquefied gas). Therefore, the guide member 30 increases the flow velocity of the liquefied gas flowing through the horizontal pipe 2A.

[0050] By providing the guide member 30, the flow path of the liquefied gas is narrowed, causing a biased flow and increasing the speed of the liquefied gas as it flows through the elbow pipe 2B and the vertical pipe 2C. When the liquefied gas passes through the horizontal pipe 2A and the guide member 30 and passes through the elbow pipe 2B, a swirling flow of the liquefied gas is formed (see the arrows in FIG. 6). When a swirling flow of the liquefied gas is formed, the centrifugal force caused by the swirling flow acts on the liquefied gas and the gas (bubbles) generated from the liquefied gas.

[0051] Liquefied gas has a higher density than gas (gas bubbles). Therefore, the low-density gas gathers at the center of the vertical pipe 2C, and the high-density liquefied gas swirls outside the vertical pipe 2C (i.e., outside the gas that gathers at the center). The funnel-shaped member 25 is disposed at the center of the vertical pipe 2C. Therefore, the gas that gathers at the center of the vertical pipe 2C is actively collected by the funnel-shaped member 25.

[0052] In this embodiment as well, the funnel-shaped member 25 is connected to the pump device 10 (more specifically, the suction bell mouth 15 of the pump 11) via the hanging member 27, thereby preventing gas generation downstream of the funnel-shaped member 25.

[0053] The embodiment shown in Figures 1 to 4 may be appropriately combined with the embodiment shown in Figures 5 and 6. More specifically, the gas entrainment prevention device 20 may include a plate-shaped member shown in Figures 1 to 4 and a funnel-shaped member 25 shown in Figures 5 and 6. With this configuration, the gas entrainment prevention device 20 can more reliably prevent the gas from being sucked into the pump 11.

[0054] The above-described embodiments have been described for the purpose of enabling a person having ordinary skill in the art to practice the present invention. Various modifications of the above-described embodiments are naturally possible for a person skilled in the art, and the technical idea of ​​the present invention can be applied to other embodiments. Therefore, the present invention is not limited to the described embodiments, but is to be interpreted in the broadest scope according to the technical idea defined by the claims. [Explanation of symbols]

[0055] 1 Liquid transfer device 2 Vacuum double piping 2A horizontal piping 2B Elbow Pipe 2Ba inner curved surface 2C Vertical piping 2Ca inner surface 3. Suction pipe 4 Discharge pipe 10 Pumping equipment 11 Pump 12 Motor 15 Suction bell mouth 15a Intake port 16 Impeller 17 Rotation axis 18 Pump casing 19 Discharge nozzle 20 Gas mixing prevention device 20a Proximal end 20b Tip 20c bent part 21 Rotor 22 Stator 23 Motor casing 25 Funnel-shaped member 26 Gas exhaust pipe 27 Suspension members 30 Guide member 30a inclined plate 30b Mounting member

Claims

1. A pump for sucking in liquefied gas and transferring it upward, The piping that houses the aforementioned pump, A liquid transfer apparatus comprising: a gas contamination prevention device that is not connected to the aforementioned piping, is supported by the pump, and collects bubbles generated from the liquefied gas before the bubbles are drawn into the pump.

2. The gas contamination prevention device includes a plate-shaped member that extends downward along the side of the pump from the side facing the side of the vertical piping, The liquid transfer apparatus according to claim 1, wherein the tip of the plate-shaped member extends toward the horizontal pipe.

3. The liquid transfer apparatus according to claim 2, wherein the plate-shaped member forms a bubble channel through which the bubbles flow between the vertical pipe and the plate-shaped member.

4. The liquid transfer apparatus according to claim 2, wherein the plate-shaped member has a bent portion that is bent towards the upstream side of the horizontal pipe midway through the plate-shaped member.

5. The liquid transfer apparatus according to claim 1, wherein the gas contamination prevention device comprises a funnel-shaped member suspended from the suction port of the pump for collecting the bubbles.

6. The liquid transfer device according to claim 5, wherein the funnel-shaped member has a diameter larger than the diameter of the suction port.

7. The liquid transfer apparatus according to claim 5, wherein the gas contamination prevention device comprises a gas discharge pipe connected to the funnel-shaped member.

8. The aforementioned gas contamination prevention device includes a guide member arranged in the horizontal piping. The liquid transfer apparatus according to claim 5, wherein the guide member generates a swirling flow of the liquefied gas by restricting the flow of the liquefied gas through the horizontal pipe.

9. A pump that sucks in liquefied gas from below and transfers it upward, A horizontal pipe supplying liquefied gas to a position below the pump in the vertical piping, A liquid transfer device comprising a gas contamination prevention device that is not connected to the aforementioned vertical piping and is supported by the pump.

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