Pumping device and pumping system

Abstract

The present invention provides a pump system that can detect if liquid fuel material enters the storage compartment for the electrical system components of the pump system, thereby protecting the pump system from corrosion. [Solution] The pump device 3 is equipped with a corrosion-resistant motor casing 5, and the motor cable 12 is covered with a corrosion-resistant motor cable protection tube 14. The pump device 3 is also equipped with corrosion-resistant internal tank piping 15. The purge gas piping 17, through which the purge gas supplied from the purge gas supply unit 16 flows, is connected to the motor cable protection tube 14 and the internal tank piping 15, and is configured to circulate the purge gas inside the pump device 3. The purge gas piping 17 is equipped with a pressure adjustment unit 18, a pressure sensor 19, and a flow sensor 20.

Description

Technical Field

[0001] The present invention relates to a pump device and a pump system for pumping a corrosive liquid fuel material such as liquid ammonia.

Background Art

[0002] Conventionally, a submerged motor pump has been used as a pump device for pumping a liquid fuel material (see, for example, Patent Document 1). A conventional submerged motor pump has a structure in which the stator and rotor of the motor are filled with a liquid fuel, and it was possible to pump an insulating liquid such as liquefied natural gas (LNG, LPG).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, liquid ammonia, which does not emit carbon dioxide when burned, has attracted attention as a liquid fuel material. Unlike liquefied natural gas (LNG, LPG), liquid ammonia is corrosive, but conventional pumping systems do not take into account the pumping of corrosive liquid fuel materials such as liquid ammonia. When pumping corrosive liquid fuel materials such as liquid ammonia in the same way as conventional liquid fuel materials such as liquefied natural gas (LNG, LPG), the motor of the pumping system is changed to a canned motor (see, for example, Patent Document 2), which is a motor in which the stator and rotor are each sealed like cans. In a pumping system using a canned motor, the pumping system is installed in liquid ammonia, so it is necessary to protect the electrical components of the pumping system from corrosion by liquid ammonia. Furthermore, if liquid ammonia enters the electrical component storage chamber of the pumping system, such as the motor winding chamber, it is necessary to detect this. Moreover, even if liquid ammonia enters the electrical component storage chamber of the pumping system, it is necessary to protect the electrical components from corrosion by liquid ammonia.

[0005] The present invention has been made in view of the above problems, and aims to provide a pump device that can detect when a corrosive liquid fuel material enters the storage chamber for the electrical system components of the pump device, and can protect the electrical system components of the pump device from corrosion. [Means for solving the problem]

[0006] The present invention relates to a pump device for pumping a corrosive liquid fuel material from inside a tank in which the liquid fuel material is stored, wherein the pump device comprises a motor made of a material resistant to corrosion with respect to the liquid fuel material that generates driving force for the pump device inside the tank, a motor casing covering the motor, a motor cable connected to a power supply unit installed outside the tank and supplying power from the power supply unit to the motor, a motor cable protection tube made of a material resistant to corrosion with respect to the liquid fuel material that covers the motor cable inside the tank, internal tank piping made of a material resistant to corrosion with respect to the liquid fuel material that is connected to the motor casing inside the tank, and a purge gas supply unit installed outside the tank and supplying power from the purge gas supply unit The system comprises a purge gas pipe through which the supplied purge gas flows, a pressure adjustment unit installed in the purge gas pipe to maintain a constant pressure inside the purge gas pipe, a pressure sensor installed in the purge gas pipe to detect changes in the pressure of the purge gas inside the purge gas pipe, and a flow sensor installed in the purge gas pipe to detect changes in the flow rate of the purge gas inside the purge gas pipe. The purge gas pipe is connected to the motor cable protection pipe and the tank piping, and the purge gas supplied from the purge gas supply unit is supplied from the purge gas pipe through either the motor cable protection pipe or the tank piping into the motor casing, and returned from the motor casing through the other of the motor cable protection pipe or the tank piping to the purge gas pipe.

[0007] In this configuration, the pump device is installed inside a tank that stores corrosive liquid fuel material (e.g., liquid ammonia), but the motor of the pump device is covered by a motor casing made of a material that is resistant to corrosion from the liquid fuel material (e.g., stainless steel), thus adequately protecting the pump device from corrosion. In this case, the motor cable that supplies power to the motor of the pump device is also installed inside the tank that stores corrosive liquid fuel material, but the motor cable is covered by a motor cable protection tube made of a material that is resistant to corrosion from the liquid fuel material, thus adequately protecting the motor cable from corrosion.

[0008] Furthermore, with this configuration, the purge gas (e.g., nitrogen gas) supplied from the purge gas supply unit is supplied to the inside of the motor casing through either the motor cable protection pipe or the internal tank piping, and then returned to the purge gas pipe from inside the motor casing through the other of the motor cable protection pipe or internal tank piping. In this way, the purge gas can be circulated using the motor cable protection pipe and internal tank piping, so the inside of the motor casing can be purged more effectively with the purge gas compared to cases where the purge gas cannot be circulated. Therefore, even if liquid fuel material enters the inside of the motor casing, the pump device can be adequately protected from corrosion by purging. Also, in this case, since the purge gas can be circulated, the inside of the motor cable protection pipe can also be effectively purged with the purge gas. Therefore, even if liquid fuel material enters the inside of the motor casing, the motor cable can be adequately protected from corrosion by purging.

[0009] Furthermore, with this configuration, the pressure adjustment unit maintains a constant pressure inside the purge gas piping. If liquid fuel material enters the motor casing, motor cable protection tube, or tank piping, vaporized fuel gas (e.g., ammonia gas) is generated from the liquid fuel material, causing a change in the pressure inside the purge gas piping. In this case, a pressure sensor can detect the change in the purge gas pressure inside the purge gas piping, thereby detecting that liquid fuel material has entered the motor casing, motor cable protection tube, or tank piping.

[0010] Furthermore, if liquid fuel material enters the motor casing, motor cable protection tube, or tank piping, vaporized fuel gas (such as ammonia gas) is generated from the liquid fuel material, changing the flow rate of purge gas inside the purge gas piping. In this case, a flow sensor can detect the change in the flow rate of purge gas inside the purge gas piping, thereby detecting that liquid fuel material has entered the motor casing, motor cable protection tube, or tank piping.

[0011] Furthermore, the pump device of the present invention may be installed in the purge gas piping and may include a detector that detects whether or not fuel gas vaporized from the liquid fuel material is mixed inside the purge gas piping.

[0012] If liquid fuel material enters the motor casing, motor cable protection tube, or tank piping, vaporized fuel gas (such as ammonia gas) from the liquid fuel material will mix into the purge gas piping. In this case, a detector can detect whether or not vaporized fuel gas from the liquid fuel material has mixed into the purge gas piping, thereby detecting that liquid fuel material has entered the motor casing, motor cable protection tube, or tank piping.

[0013] Furthermore, the pump device of the present invention may also include a detoxification device connected to the purge gas piping, which detoxifies the fuel gas vaporized from the liquid fuel material mixed inside the purge gas piping.

[0014] If liquid fuel material enters the motor casing, motor cable protection tube, or tank piping, a detoxification device can detoxify the fuel gas (e.g., ammonia gas) vaporized from the liquid fuel material that has entered the purge gas piping, rendering it harmless.

[0015] The pump system of the present invention comprises a tank for storing a corrosive liquid fuel material and a pump device for pumping the liquid fuel material from the tank, wherein the pump device is made of a material that is corrosion-resistant to the liquid fuel material and generates driving force for the pump device inside the tank, a motor casing covering the motor, a motor cable connected to a power supply unit installed outside the tank and supplying power from the power supply unit to the motor, a motor cable protection tube made of a material that is corrosion-resistant to the liquid fuel material and covering the motor cable inside the tank, internal tank piping made of a material that is corrosion-resistant to the liquid fuel material and connected to the motor casing inside the tank, and a purge gas supply unit installed outside the tank and the purge gas supply unit The system comprises a purge gas pipe through which purge gas supplied from a purge gas supply unit flows, a pressure adjustment unit installed in the purge gas pipe to maintain a constant pressure inside the purge gas pipe, a pressure sensor installed in the purge gas pipe to detect changes in the pressure of the purge gas inside the purge gas pipe, and a flow sensor installed in the purge gas pipe to detect changes in the flow rate of the purge gas inside the purge gas pipe. The purge gas pipe is connected to the motor cable protection pipe and the tank piping, and the purge gas supplied from the purge gas supply unit is supplied from the purge gas pipe through either the motor cable protection pipe or the tank piping into the motor casing, and returned from the motor casing through the other of the motor cable protection pipe or the tank piping to the purge gas pipe.

[0016] In this pump system, as with the pump device described above, the pump device is installed inside a tank that stores corrosive liquid fuel material (e.g., liquid ammonia). However, the motor is covered by a motor casing made of a material that is resistant to corrosion from the liquid fuel material (e.g., stainless steel), thus adequately protecting the pump device from corrosion. In this case, the motor cable that supplies power to the motor of the pump device is also installed inside the tank that stores corrosive liquid fuel material. However, the motor cable is covered by a motor cable protection tube made of a material that is resistant to corrosion from the liquid fuel material, thus adequately protecting the motor cable from corrosion.

[0017] Furthermore, this pump system also supplies purge gas (e.g., nitrogen gas) from the purge gas supply unit into the motor casing via either the motor cable protection tube or the internal tank piping, and returns it to the purge gas pipe from inside the motor casing via the other of the motor cable protection tube or internal tank piping. Because the purge gas can be circulated using the motor cable protection tube and internal tank piping in this way, the inside of the motor casing can be effectively purged by the purge gas compared to cases where the purge gas cannot be circulated. Therefore, even if liquid fuel material enters the motor casing, the pump system can be adequately protected from corrosion by purging. Also, because the purge gas can be circulated, the inside of the motor cable protection tube can be effectively purged by the purge gas. Therefore, even if liquid fuel material enters the motor casing, the motor cables can be adequately protected from corrosion by purging.

[0018] Furthermore, with this pump system, the pressure adjustment unit also keeps the pressure inside the purge gas pipe constant. When a situation occurs where the liquid fuel material enters the inside of the motor casing, the motor cable protection pipe, or the internal piping of the tank, fuel gas (e.g., ammonia gas, etc.) vaporized from the liquid fuel material is generated, and the pressure inside the purge gas pipe changes. In this case, the pressure sensor can detect the change in the pressure of the purge gas inside the purge gas pipe, thereby detecting that a situation has occurred where the liquid fuel material has entered the inside of the motor casing, the motor cable protection pipe, or the internal piping of the tank.

[0019] Also, when a situation occurs where the liquid fuel material enters the inside of the motor casing, the motor cable protection pipe, or the internal piping of the tank, fuel gas (e.g., ammonia gas, etc.) vaporized from the liquid fuel material is generated, and the flow rate of the purge gas inside the purge gas pipe changes. In this case, the flow rate sensor can detect the change in the flow rate of the purge gas inside the purge gas pipe, thereby detecting that a situation has occurred where the liquid fuel material has entered the inside of the motor casing, the motor cable protection pipe, or the internal piping of the tank.

Advantages of the Invention

[0020] According to the present invention, when a situation occurs where the liquid fuel material enters the inside of the motor of the pump device, it can be detected, and the pump device can be protected from corrosion.

Brief Description of the Drawings

[0021] [Figure 1] It is an explanatory diagram showing the configuration of the pump device in the embodiment of the present invention. [Figure 2] It is a cross-sectional view of the pump device in the embodiment of the present invention. [Figure 3] It is an explanatory diagram showing the flow of nitrogen gas (when the ammonia concentration is less than the threshold value) in the embodiment of the present invention. [Figure 4]It is an explanatory diagram showing the flow of nitrogen gas (when the ammonia concentration is at or above the threshold) in the embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0022] Hereinafter, the pump device according to the embodiment of the present invention will be described with reference to the drawings. In this embodiment, the case of a pump device used as a canned motor pump for liquid ammonia or the like will be exemplified.

[0023] The configuration of the pump device according to the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing the configuration of the pump system according to the present embodiment, and FIG. 2 is a cross-sectional view of the pump device according to the present embodiment. As shown in FIGS. 1 and 2, the pump system 1 includes a tank 2 in which liquid ammonia (a corrosive liquid fuel material) is stored, and a pump device 3 installed inside the tank 2 for pumping up the liquid ammonia. The tank 2 includes a tank casing 4 made of a material having corrosion resistance to liquid ammonia (for example, stainless steel, etc.), and the pump device 3 includes a motor casing 5 made of a material having corrosion resistance to liquid ammonia (for example, stainless steel, etc.).

[0024] As shown in FIG. 2, inside the motor casing 5, there are a motor (stator) 6 that generates the driving force of the pump device 3, a motor (rotor) 6, a rotating shaft 7 that is rotated by the driving force of the motor (rotor) 6', and a pair of upper and lower bearings 8 that rotatably support the rotating shaft 7. Note that the motor (stator) 6 and the motor (rotor) 6' each have a canned motor structure sealed so as not to contact the liquid. Also, inside the motor casing 5, acceleration sensors 9 for measuring the high-frequency vibration of the bearings 8 are installed near the pair of upper and lower bearings 8, respectively.

[0025] As shown in Figures 1 and 2, outside the tank 2 are a power supply unit 10 that supplies power to the pump device 3, and two measuring devices 11 (upper measuring device 11 and lower measuring device 11) that receive output signals from a pair of upper and lower acceleration sensors 9. A motor cable 12 that supplies power from the power supply unit 10 is connected to the motor (stator) 6, and sensor cables 13 that transmit output signals to the measuring devices 11 (upper measuring device 11 and lower measuring device 11) are connected to the pair of upper and lower acceleration sensors 9, respectively. The motor cable and sensor cable 13 are covered by a motor cable protection tube 14 and a sensor cable protection tube 15, respectively, made of a material that is corrosion-resistant to liquid ammonia (for example, stainless steel). The sensor cable protection tube 15 can also be called internal tank piping.

[0026] As shown in Figure 1, outside the tank 2, there is a nitrogen tank 16 for supplying nitrogen gas as a purge gas, and a nitrogen gas piping 17 through which the nitrogen gas supplied from the nitrogen tank 16 flows. Here, the nitrogen tank 16 corresponds to the purge gas supply unit of the present invention, and the nitrogen gas piping 17 corresponds to the purge gas piping of the present invention. The nitrogen gas piping 17 is connected to the motor cable protection tube 14 and the sensor cable protection tube 15, and the nitrogen gas supplied from the nitrogen tank 16 is supplied from the nitrogen gas piping 17 through the sensor cable protection tube 15 into the motor casing 5, and then returned from the inside of the motor casing 5 through the motor cable protection tube 14 to the nitrogen gas piping 17. Alternatively, the nitrogen gas supplied from the nitrogen tank 16 may be supplied from the nitrogen gas piping 17 through the motor cable protection tube 14 into the motor casing 5, and then returned from the inside of the motor casing 5 through the sensor cable protection tube 15 to the nitrogen gas piping 17.

[0027] Furthermore, as shown in Figure 1, the nitrogen gas piping 17 is equipped with a pressure adjustment unit 18 that maintains a constant internal pressure, a pressure sensor 19 that detects changes in the pressure of the nitrogen gas inside the nitrogen gas piping 17, and a flow sensor 20 that detects changes in the flow rate of the nitrogen gas inside the nitrogen gas piping 17. The pressure adjustment unit 18 can be configured, for example, with a pressure reducing valve. The nitrogen gas piping 17 is also equipped with an ammonia detector 21 that detects whether or not ammonia gas vaporized from liquid ammonia is mixed into the nitrogen gas piping 17. The ammonia detector 21 can detect, for example, the presence of ammonia gas inside the nitrogen gas piping 17 when the concentration of ammonia contained in the nitrogen gas inside the nitrogen gas piping 17 exceeds a predetermined threshold.

[0028] Furthermore, as shown in Figure 1, an ammonia abatement pipe 22 is branched off from the nitrogen gas pipe 17 to abate ammonia gas. The ammonia abatement pipe 22 is connected to an ammonia abatement device 23, which abates ammonia gas vaporized from liquid ammonia mixed inside the nitrogen gas pipe 17.

[0029] The ammonia abatement device 23 is connected to a water supply pipe 24 for supplying water (washing water) used to abate ammonia gas, a drain pipe 25 for discharging the ammonia water produced by the ammonia gas abatement, and an exhaust pipe 26 for discharging nitrogen gas from which ammonia gas has been removed. The water supply pipe is equipped with a water pump 27 for supplying water (washing water) used to ammonia gas abatement device 23.

[0030] The ammonia abatement piping 22 is equipped with an automatic valve 28 that is controlled to open when ammonia gas is being treated for abatement, and a blower 29 for sending nitrogen gas mixed with ammonia gas to the ammonia abatement device 23. The automatic valve 28 of the ammonia abatement piping 22 is controlled to close when ammonia gas is not being treated for abatement. The nitrogen gas piping 17 is equipped with an automatic valve 30 that is controlled to close when ammonia gas is being treated for abatement. The automatic valve 30 of the nitrogen gas piping 17 is controlled to open when ammonia gas is not being treated for abatement.

[0031] Figures 3 and 4 are explanatory diagrams showing the flow of nitrogen gas in the pump system 1 of this embodiment. In Figures 3 and 4, the flow of nitrogen gas is indicated by arrows. As shown in Figure 3, if the ammonia detector 21 does not detect that ammonia gas is mixed inside the nitrogen gas piping 17, that is, if the concentration of ammonia contained in the nitrogen gas in the nitrogen gas piping 17 is below a predetermined threshold, the automatic valve 30 of the nitrogen gas piping 17 is opened and the automatic valve 28 of the ammonia removal piping 22 is closed.

[0032] Furthermore, as shown in Figure 4, if the ammonia detector 21 detects that ammonia gas is mixed inside the nitrogen gas piping 17, that is, if the concentration of ammonia contained in the nitrogen gas in the nitrogen gas piping 17 is above a predetermined threshold, the automatic valve 30 of the nitrogen gas piping 17 is closed and the automatic valve 28 of the ammonia removal piping 22 is opened.

[0033] In this embodiment of the pump device 3, the pump device 3 is installed inside the tank 2 where corrosive liquid ammonia is stored. However, since the motor (stator) 6 is covered by a motor casing 5 made of a material that is resistant to corrosion from liquid ammonia (for example, stainless steel), the pump device 3 can be adequately protected from corrosion. In this case, the motor cable 12 that supplies power to the motor 6 of the pump device 3 is also installed inside the tank 2 where liquid ammonia is stored. However, since the motor cable 12 is covered by a motor cable protection tube 14 made of a material that is resistant to corrosion from liquid ammonia, the motor cable 12 can be adequately protected from corrosion.

[0034] Furthermore, according to the pump device 3 of this embodiment, nitrogen gas supplied from the nitrogen tank 16 is supplied from the nitrogen gas piping 17 to the inside of the motor casing 5 through either the motor cable protection tube 14 or the internal tank piping 15, and then returned from the inside of the motor casing 5 to the nitrogen gas piping 17 through the other of the motor cable protection tube 14 or the internal tank piping 15. In this way, nitrogen gas can be circulated using the motor cable protection tube 14 and the internal tank piping 15, so the inside of the motor casing 5 can be effectively purged with nitrogen gas compared to the case where nitrogen gas cannot be circulated. Therefore, even if liquid ammonia enters the inside of the motor casing 5, the motor (stator) 6 can be properly protected from corrosion by purging. Also, in this case, since nitrogen gas can be circulated, the inside of the motor cable protection tube 14 can also be effectively purged with nitrogen gas. Therefore, even if liquid ammonia enters the inside of the motor casing 5, the motor cable 12 can be properly protected from corrosion by purging.

[0035] Furthermore, according to the pump device 3 of this embodiment, the pressure adjustment unit 18 maintains a constant pressure inside the nitrogen gas piping 17. If liquid ammonia enters the motor casing 5, motor cable protection tube 14, or tank piping 15, vaporized ammonia gas is generated from the liquid ammonia, causing a change in the pressure inside the nitrogen gas piping 17. In this case, the pressure sensor 19 can detect the change in nitrogen gas pressure inside the nitrogen gas piping 17, thereby detecting that liquid ammonia has entered the motor casing 5, motor cable protection tube 14, or tank piping 15.

[0036] Furthermore, if liquid ammonia enters the motor casing 5, motor cable protection tube 14, or tank piping 15, vaporized ammonia gas will be generated from the liquid ammonia, changing the flow rate of nitrogen gas inside the nitrogen gas piping 17. In this case, the flow sensor 20 can detect the change in the flow rate of nitrogen gas inside the nitrogen gas piping 17, thereby detecting that liquid ammonia has entered the motor casing 5, motor cable protection tube 14, or tank piping 15.

[0037] Furthermore, in this embodiment, if liquid ammonia enters the motor casing 5, motor cable protection tube 14, or tank piping 15, vaporized ammonia gas from the liquid ammonia will enter the nitrogen gas piping 17. In this case, the ammonia detector 21 can detect whether or not vaporized ammonia gas from the liquid ammonia has entered the nitrogen gas piping 17, thereby detecting that liquid ammonia has entered the motor casing 5, motor cable protection tube 14, or tank piping 15.

[0038] Furthermore, in this embodiment, if liquid ammonia enters the motor casing 5, motor cable protection tube 14, or tank piping 15, the ammonia abatement device 23 can detoxify the ammonia gas vaporized from the liquid ammonia that has entered the nitrogen gas piping 17.

[0039] Although embodiments of the present invention have been described above by example, the scope of the present invention is not limited to these, and modifications and alterations can be made within the scope described in the claims depending on the purpose. [Industrial applicability]

[0040] As described above, the pump device according to the present invention has the effect of being able to detect when liquid fuel material enters the storage chamber of the electrical system components of the pump device, and protecting the pump device from corrosion, and is useful when used as a canned motor pump for liquid ammonia, etc. [Explanation of Symbols]

[0041] 1. Pump System 2 tanks 3. Pumping device 4 Tank casing 5. Motor casing 6. Motor (stator) 6' Motor (Rotor) 7 Rotating Shaft 8 bearings 9. Accelerometer (sensor) 10 Power supply 11. Measuring devices (upper measuring device, lower measuring device) 12 Motor Cables 13 Sensor Cable 14 Motor cable protection tube 15. Sensor cable protection tube (internal tank piping) 16. Nitrogen tank (purge gas supply unit) 17. Nitrogen gas piping (purge gas piping) 18 Pressure adjustment section 19. Pressure sensor 20 Flow Sensor 21 Ammonia detector (detector) 22 Ammonia removal piping 23 Ammonia abatement device (abatement device) 24 Water supply pipe 25 Drain pipe 26 Exhaust pipe 27 Water supply pump 28 Automatic valves 29 Blower 30 Automatic valves

Claims

1. In a pumping device for drawing up a liquid fuel material from inside a tank in which a corrosive liquid fuel material is stored, The pump device is, A motor casing, which is made of a material that is corrosion-resistant to the liquid fuel material and covers the motor of the pump device inside the tank, A motor installed inside the motor casing generates the driving force for the pump device, A motor cable connected to a power supply unit installed outside the tank, which supplies power from the power supply unit to the motor, A motor cable protection tube, which is made of a material that is corrosion-resistant to the liquid fuel material and covers the motor cable inside the tank, The piping inside the tank is made of a material that is corrosion-resistant to the liquid fuel material and is connected to the motor casing inside the tank, A purge gas pipe is connected to a purge gas supply unit installed outside the tank, and through which the purge gas supplied from the purge gas supply unit flows. A pressure adjustment unit is installed in the purge gas piping and maintains a constant pressure inside the purge gas piping, A pressure sensor installed in the purge gas piping detects changes in the pressure of the purge gas inside the purge gas piping, A flow sensor is installed in the purge gas piping and detects changes in the flow rate of the purge gas inside the purge gas piping. Equipped with, A pump device configured such that the purge gas piping is connected to the motor cable protection pipe and the tank piping, and the purge gas supplied from the purge gas supply unit is supplied from the purge gas piping through either the motor cable protection pipe or the tank piping into the motor casing, and returned from the motor casing through the other of the motor cable protection pipe or the tank piping to the purge gas piping.

2. The pump device according to claim 1, further comprising a detector installed in the purge gas piping for detecting whether or not fuel gas vaporized from the liquid fuel material is mixed inside the purge gas piping.

3. The pump device according to claim 1 or claim 2, further comprising a detoxification device connected to the purge gas piping for detoxifying fuel gas vaporized from the liquid fuel material mixed inside the purge gas piping.

4. A tank for storing corrosive liquid fuel materials, A pump device for drawing the liquid fuel material from the tank, In a pump system equipped with, The pump device is, A motor casing, which is made of a material that is corrosion-resistant to the liquid fuel material and covers the motor of the pump device inside the tank, A motor installed inside the motor casing generates the driving force for the pump device, A motor cable connected to a power supply unit installed outside the tank, which supplies power from the power supply unit to the motor, A motor cable protection tube, which is made of a material that is corrosion-resistant to the liquid fuel material and covers the motor cable inside the tank, The piping inside the tank is made of a material that is corrosion-resistant to the liquid fuel material and is connected to the motor casing inside the tank, A purge gas pipe is connected to a purge gas supply unit installed outside the tank, and through which the purge gas supplied from the purge gas supply unit flows. A pressure adjustment unit is installed in the purge gas piping and maintains a constant pressure inside the purge gas piping, A pressure sensor installed in the purge gas piping detects changes in the pressure of the purge gas inside the purge gas piping, A flow sensor is installed in the purge gas piping and detects changes in the flow rate of the purge gas inside the purge gas piping. Equipped with, A pump system configured such that the purge gas piping is connected to the motor cable protection pipe and the tank piping, and the purge gas supplied from the purge gas supply unit is supplied from the purge gas piping through either the motor cable protection pipe or the tank piping into the motor casing, and returned from the motor casing through the other of the motor cable protection pipe or the tank piping to the purge gas piping.

Images