JP6944398B2 - Fuel supply system, pump equipment, and management operation method of fuel supply system - Google Patents

Description

The present invention relates to a fuel supply system, a pump facility, and a management operation method of the fuel supply system.

Patent Document 1 below discloses a pump station that operates for the purpose of controlling flooding in heavy rain or the like as a pump facility including a plurality of pumps driven by an internal combustion engine. In such a pump station, reliable operation is required in the event of a flood, and controlled operation of the main pump and auxiliary machinery is indispensable in order to confirm the soundness of the entire equipment. In particular, an increase in fuel consumption of the internal combustion engine that drives the main pump shortens the continuous operation time that can be covered by the amount of fuel stored, leading to a decrease in reliability. It is necessary to restore the function by repairing. Conventionally, as a method for detecting an abnormality (fuel leakage, etc.) in a fuel supply system that leads to such a decrease in reliability, those described in the following Patent Documents 2 to 5 are known.

Japanese Unexamined Patent Publication No. 2017-36669 Japanese Unexamined Patent Publication No. 10-141163 JP-A-2002-310024 Japanese Unexamined Patent Publication No. 63-285260 Japanese Unexamined Patent Publication No. 8-202444

By the way, in the conventional abnormality detection method described in Patent Documents 2 to 5, when the pump equipment is operated, the abnormality is detected by monitoring the fuel transfer time by the fuel transfer pump and the like. However, in the pump station described above, the operation time is too short (for example, 50 to 100 hours / year), so that the frequency of detecting an abnormality is low, and during the period from the actual operation of the pump station to the next actual operation, There was a possibility that the main pump could not be operated due to failures such as corrosion and sticking due to aging deterioration and abnormalities (cracks, leaks, etc.) in the piping system due to external factors such as earthquakes. In addition, in the conventional abnormality detection method, an abnormality is often detected in a terminal state such as a damaged refueling pipe, and a sign of the abnormality is detected before the system fails. , It was difficult to carry out maintenance and repairs in advance.

The present invention has been made in view of the above problems, and is a fuel supply system, a pump facility, and a pump facility capable of detecting a sign of an abnormality before the system fails and performing maintenance and repair in advance. The purpose is to provide a management operation method for the fuel supply system.

(1) The fuel supply system according to one aspect of the present invention includes a fuel oil storage tank for storing fuel, a fuel small discharge tank installed at a position higher than the fuel oil storage tank, and the fuel small discharge tank from the fuel oil storage tank. The constant volume type fuel transfer pump that transfers fuel to the oil level, the oil level detector that detects at least the high level and the low level of the oil level of the fuel dispensing tank, and the detection result of the oil level detector. Based on this, a fuel supply system including a control device for driving the fuel transfer pump, the return pipe for returning fuel to the fuel oil storage tank from the lower level or lower of the fuel dispensing tank, and the return pipe. The control device includes an opening / closing device for opening / closing, and the control device opens the return pipe by the opening / closing device to set an oil level lowering time from the high level to the low level of the oil level in the fuel dispensing tank. It has a management operation mode that periodically measures and detects a sign of a system abnormality based on the change in the oil level drop time.

(2) In the fuel supply system described in (1) above, an internal combustion engine installed at a position lower than the fuel dispensing tank and refueling to supply fuel from the fuel dispensing tank to the internal combustion engine. A pipe may be provided, and the return pipe may be connected to the refueling pipe to return fuel from the refueling pipe to the fuel storage tank.

(3) In the fuel supply system according to (1) or (2) above, the control device measures the oil level drop time, closes the return pipe by the opening / closing device, and transfers the fuel. The pump is driven to periodically measure the oil level rise time from the low level to the high level of the oil level in the fuel dispensing tank, and the system abnormality is based on the change in the oil level rise time. You may detect the sign of.

(4) The fuel supply system according to one aspect of the present invention includes a fuel oil storage tank for storing fuel, a fuel small discharge tank installed at a position higher than the fuel oil storage tank, and the fuel small discharge tank from the fuel oil storage tank. The constant volume type fuel transfer pump that transfers fuel to the oil level, the oil level detector that detects at least the high level and the low level of the oil level of the fuel dispensing tank, and the detection result of the oil level detector. Based on this, a fuel supply system including a control device for driving the fuel transfer pump, wherein the control device drives the fuel transfer pump and the oil level of the fuel dispensing tank is from the low level. It has a management operation mode in which the oil level rise time until the oil level rises to the high level is periodically measured, and a sign of a system abnormality is detected based on the change in the oil level rise time.

(5) The pump equipment according to one aspect of the present invention is driven by an internal combustion engine and has a main pump that pumps water from a suction water tank and any one of (1) to (4) above that supplies fuel to the internal combustion engine. The pump equipment including the fuel supply system according to the section, wherein the control device performs an interlock process so that the management operation mode is not executed in the normal operation mode in which the main pump is driven.

(6) The management operation method of the fuel supply system according to one aspect of the present invention is the fuel oil storage tank for storing fuel, the fuel small discharge tank installed at a position higher than the fuel oil storage tank, and the fuel oil storage tank. A fuel supply system including a constant-volume fuel transfer pump that transfers fuel to the fuel dispensing tank and an oil level detector that detects at least the high level and the low level of the oil level of the fuel dispensing tank. A return pipe for returning fuel to the fuel oil storage tank from the lower level or lower of the fuel dispensing tank, and an opening / closing device for opening / closing the return pipe. Open the pipe, periodically measure the oil level drop time from the high level to the low level in the fuel dispensing tank, and based on the change in the oil level drop time, the system abnormality Detect signs.

(7) The management operation method of the fuel supply system according to one aspect of the present invention is the fuel oil storage tank for storing fuel, the fuel small discharge tank installed at a position higher than the fuel oil storage tank, and the fuel oil storage tank. A fuel supply system including a constant-volume fuel transfer pump that transfers fuel to the fuel dispensing tank and an oil level detector that detects at least the high level and the low level of the oil level of the fuel dispensing tank. In the controlled operation method of the above, the fuel transfer pump is driven, the oil level rise time from the low level to the high level of the oil level in the fuel dispensing tank is periodically measured, and the oil is measured. Detects signs of system malfunction based on changes in surface rise time.

According to the above aspect of the present invention, it is possible to detect a sign of an abnormality before the system fails and perform maintenance and repair in advance.

It is an overall block diagram of the pump station which concerns on one Embodiment. It is a control flow by the control device which concerns on one Embodiment. This is an example of the measurement results of the oil level lowering time and the oil level rising time according to the embodiment. It is an overall block diagram of the pump machine field which concerns on the modification of one Embodiment.

Hereinafter, the fuel supply system, the pump equipment, and the management operation method of the fuel supply system according to the embodiment of the present invention will be described with reference to the drawings. In the following description, as an application example of the present invention, a pump station operating for the purpose of flood control in heavy rain or the like will be illustrated.

FIG. 1 is an overall configuration diagram of a pump station 1 according to an embodiment.
The pump station 1 shown in FIG. 1 includes a main pump 10 and a fuel supply system 20. Although not shown, a plurality of main pumps 10 are installed at the pump station 1. The main pump 10 includes a plurality of auxiliary machines including the fuel transfer pump 32 of the fuel supply system 20 (for example, an air tank used for starting an internal combustion engine, a compressor (not shown) for supplying compressed air to the air tank, and the like. ) Driven by. The main pump 10 shown in FIG. 1 is a vertical axis pump, but may be a horizontal axis pump.

The main pump 10 has a suction port 11a that opens into the suction water tank 2, and a flap valve 11b is provided at the discharge port that opens into the discharge water tank 3. The suction water tank 2 and the discharge water tank 3 are provided with water level detectors 2a and 3a for detecting the water level. A pump shaft 12 extending in the vertical direction is inserted into the casing 11. An impeller 12a is connected to the lower end of the pump shaft 12. Further, a discharge valve 13 is provided on the downstream side of the impeller 12a of the casing 11 and on the upstream side of the flap valve 11b.

The main pump 10 is driven by the internal combustion engine 4. The internal combustion engine 4 is, for example, a diesel engine or the like. A speed reducer 5 is connected to the drive shaft 4a of the internal combustion engine 4, and a pump shaft 12 of the main pump 10 is connected to the speed reducer 5. By driving the internal combustion engine 4, the pump shaft 12 rotates via the speed reducer 5, the water in the suction water tank 2 is pumped by the main pump 10, and the water is discharged to the discharge water tank 3. ing.

The fuel supply system 20 supplies fuel to the internal combustion engine 4. The fuel supply system 20 includes a fuel oil storage tank 21 for storing fuel and a fuel small discharge tank 22 installed at a position higher than the fuel oil storage tank 21. The fuel storage tank 21 is installed underground, for example. The fuel small discharge tank 22 is installed at a predetermined height on the ground, for example, and supplies the fuel pumped from the fuel oil storage tank 21 to the internal combustion engine 4. The fuel storage tank 21 and the fuel dispensing tank 22 are provided with oil level detectors 21a and 22a for detecting the oil level.

The fuel storage tank 21 and the fuel small discharge tank 22 are connected by a fuel pumping pipe 30. The fuel pumping pipe 30 is provided with a strainer 31 for removing foreign substances contained in the fuel, a fuel transfer pump 32 for transferring fuel from the fuel oil storage tank 21 to the fuel dispensing tank 22, and the like. As the fuel transfer pump 32, it is preferable to use a constant volume type pump in which the discharge amount does not fluctuate due to fluctuations in the actual head (oil level of the fuel dispensing tank 22). In this embodiment, a gear pump is adopted as the fuel transfer pump 32.

The fuel transfer pump 32 is driven based on the detection result of the oil level detector 22a under the control of the control device 100 described later. The oil level detector 22a detects at least the high level H and the low level L of the oil level of the fuel dispensing tank 22. The high level H and the low level L may be set values that can be set by the administrator. The control device 100 starts the fuel transfer pump 32 when the low level L is detected from the oil level detector 22a, and stops the fuel transfer pump 32 when the high level H is detected from the oil level detector 22a. ..

The fuel dispensing tank 22 and the internal combustion engine 4 are connected by a refueling pipe 40. The internal combustion engine 4 is installed at a position lower than the fuel dispensing tank 22, and the refueling pipe 40 can supply fuel from the fuel dispensing tank 22 to the internal combustion engine 4 in a natural flow. Specifically, the refueling pipe 40 is connected to the lower side surface of the fuel dispensing tank 22 below the low level L, and the internal combustion engine 4 is installed at a height below the connection position of the refueling pipe 40. A strainer 41 or the like for removing foreign matter contained in the fuel is installed in the refueling pipe 40.

A return pipe 50 is connected to the downstream side of the strainer 41 of the refueling pipe 40. The return pipe 50 returns fuel to the fuel oil storage tank 21 from the low level L or lower of the fuel small discharge tank 22, and is located at a position equal to or higher than the maximum oil level of the fuel oil storage tank 21 (high level H in the fuel oil storage tank 21). It is open and connected to. The return pipe 50 is provided with a switchgear 51 that opens and closes the return pipe 50. The switchgear 51 is a valve (electric valve or solenoid valve) for closing the return pipe 50 in the normal operation mode described later and opening the return pipe 50 in the management operation mode described later.

The pump station 1 includes a control device 100 that comprehensively controls the operation of each of the above-mentioned constituent devices. In the control device 100, a calculation unit such as a CPU (not shown), a storage unit such as a RAM, ROM, a hard disk drive (HDD), a solid state drive (SSD), an input / output interface for exchanging data with each component device, and the like are not shown. It is connected by a bus. In addition to the above-described components, a display device such as a display (not shown) and an input device such as a mouse and a keyboard are connected to the input / output interface.

A program for the arithmetic unit to read and execute is stored in the storage unit, and the control device 100 causes the control device 100 to execute the normal operation mode and the management operation mode described below according to the program. The normal operation mode is a normal operation mode in which the main pump 10 is operated for the purpose of flood control in heavy rain or the like. The normal operation mode includes an independent operation mode in which the main pump 10 is operated independently, an interlocking operation mode in which the main pump 10 is operated by a plurality of units, and an automatic operation in which the main pump 10 is automatically operated according to the water level of the suction water tank 2. Mode etc. are included.

The management operation mode is an operation mode for detecting a sign of abnormality in the fuel supply system 20 of the pump station 1. Here, the "abnormality" means a terminal state in which the refueling pipe 40 of the fuel supply system 20 is damaged, and specifically, the main pump 10 cannot be started or the main pump 10 is caused by the damage. Refers to a failure condition that must be stopped. The "sign of abnormality" is a state before the above-mentioned failure state, that is, a state in which the main pump 10 can be started and operated at the present time, but there is a high possibility that the above-mentioned failure state will occur in the near future. Say that.

In the management operation mode, the control device 100 is programmed by the switchgear 51 to open the return pipe 50. Then, the control device 100 periodically measures the oil level drop time ΔT1 (see FIG. 2 described later) from the high level H to the low level L of the fuel level in the fuel dispensing tank 22, and the oil level is concerned. A sign of a system abnormality is detected based on the change in the decrease time ΔT1. The control device 100 periodically (for example, about once a month) executes the operation in this management operation mode.

Further, in the present embodiment, after measuring the oil level drop time ΔT1, the control device 100 closes the return pipe 50 by the opening / closing device 51, drives the fuel transfer pump 32, and raises the oil level of the fuel dispensing tank 22. The oil level rise time ΔT2 from the low level L to the high level H is periodically measured, and a sign of a system abnormality is detected based on the change in the oil level rise time ΔT2. When the operation in the normal operation mode described above is performed, the control device 100 performs an interlock process so that the periodic operation in the management operation mode is not executed (see FIG. 2 to be described later).

Next, the management operation method of the fuel supply system 20 configured as described above, specifically, the control flow of the control device 100 that executes the management operation mode will be described in detail.

FIG. 2 is a control flow by the control device 100 according to the embodiment.
As shown in FIG. 2, first, the control device 100 switches the operation mode to the management operation mode when the inspection timing preset by a timer or the like (not shown) is reached (step S1). Next, the control device 100 confirms various conditions for satisfying the start condition of the management operation mode (step S2). The start conditions include conditions under which drainage operation is not performed, such as the main pump 10 not in operation, the internal water level of the suction water tank 2 being below the specified water level, and the switchgear 51, which is an on-off valve for managed operation, closed. Includes confirmation of completed conditions.

When the main pump 10 is in operation or the internal water level of the suction water tank 2 exceeds the specified water level, the management operation is stopped (or postponed) so as not to interfere with the normal operation in the normal operation mode. Such an interlock process enables reliable operation at the time of flood, which is prioritized as the pump station 1. When the switchgear 51 is open, fuel does not accumulate in the fuel dispensing tank 22, so the following steps are executed after confirming that the switchgear 51 is closed.

Next, the control device 100 determines whether or not the oil level of the fuel dispensing tank 22 is at a high level H (step S3). If the result of the determination in step S3 is "No", the control device 100 activates the fuel transfer pump 32 (step S4) and raises the oil level of the fuel dispensing tank 22 to a higher level H (step S4). Step S5). Then, when the oil level detector 22a detects the high level H, the control device 100 stops the fuel transfer pump 32 (step S6).

When the oil level of the fuel dispensing tank 22 reaches the high level H, the control device 100 then opens the return pipe 50 by the switchgear 51 (step S7), and the oil level of the fuel dispensing tank 22 is low. The oil level drop time ΔT1 until the level L is reached (step S8) is measured.
After that, the control device 100 starts the fuel transfer pump 32 (step S9), and at the same time, closes the return pipe 50 by the switchgear 51 (step S10). The fuel transfer pump 32 may be started after the return pipe 50 is closed by the switchgear 51.

In the control device 100, when the return pipe 50 is closed by the switchgear 51 and the fuel transfer pump 32 is started as described above, the oil level of the fuel dispensing tank 22 changes from the low level L to the high level H. The surface rise time ΔT2 is measured. Then, when the oil level detector 22a detects the high level H, the control device 100 stops the fuel transfer pump 32 (step S12).
As a result, the management operation of the fuel supply system 20 is completed.

FIG. 3 is an example of the measurement results of the oil level lowering time ΔT1 and the oil level rising time ΔT2 according to the embodiment.
As shown in FIG. 3, the control device 100 stores the measurement results (fluid state amount) of the oil level lowering time ΔT1 and the oil level rising time ΔT2 periodically measured by the management operation mode in the storage unit, and stores the measurement results (fluid state amount). Detect signs of abnormality based on changes. For example, when the management operation mode is executed once a month, the angle between the straight line connecting the measured value of the month and the measured value of the previous month and the straight line connecting the measured value of the previous month and the measured value of the month before the previous month. If the difference θ is equal to or greater than a predetermined threshold value, it can be determined that there is a sign of some abnormality in the fuel supply system 20. That is, it is preferable that there are three or more measured values (data) for detecting the sign of abnormality, whereby the sign of abnormality can be detected based on the tendency of the measured values (ΔT1, ΔT2) to change. Further, it is preferable that the detection of the sign of abnormality is performed at a value whose measured value is equal to or lower than the failure level at which a system failure is detected. Further, for the measured values (ΔT1, ΔT2), the permissible value (required time) for calculating the abnormal sign value is calculated in a conceivable state (clogging or leakage of the pipe, etc.), and combined with the above threshold value, the abnormal sign is predicted. It is preferable to determine. The above-mentioned threshold value and allowable value can be individually used for determining an abnormality sign.

In the example shown in FIG. 3, the change in the oil level drop time ΔT1 is large on the + side when the oil level drop time ΔT1 in the initial state in which the periodic management operation is started is used as a reference. It is possible to detect a sign of abnormality of a flow path obstructing factor due to clogging (for example, clogging of foreign matter in the strainer 41) or air accumulation. If the change in the oil level drop time ΔT1 is large on the − side, it is possible to detect a sign of an abnormality such as fuel leakage from the fuel dispensing tank 22 or the refueling pipe 40.

If the change in the oil level rise time ΔT2 is large on the + side, the fuel pumping pipe 30 is clogged (for example, the strainer 31 is clogged with foreign matter), a flow path obstruction factor due to air accumulation, or the fuel transfer pump 32 It is possible to detect signs of abnormality such as performance deterioration. If the change in the oil level rise time ΔT2 is large on the − side, it is possible to detect a sign of an abnormality such as a failure of the oil level detector 22a.

As described above, according to the present embodiment, the fuel oil storage tank 21 for storing fuel, the fuel small discharge tank 22 installed at a position higher than the fuel oil storage tank 21, and the fuel small discharge tank 21 to the fuel small discharge tank 22 A constant volume type fuel transfer pump 32 for transferring fuel, an oil level detector 22a for detecting at least a high level H and a low level L among the oil level of the fuel dispensing tank 22, and an oil level detector 22a. A fuel supply system 20 including a control device 100 for driving a fuel transfer pump 32 based on a detection result, and a return pipe 50 for returning fuel to the fuel oil storage tank 21 from a lower level L or lower of the fuel dispensing tank 22. The control device 100 opens the return pipe 50 by the opening / closing device 51, and the oil level of the fuel dispensing tank 22 changes from the high level H to the low level L. A configuration is adopted in which the oil level drop time ΔT1 up to is periodically measured, and a management operation mode is provided to detect a sign of a system abnormality based on the change in the oil level drop time ΔT1. As a result, it is possible to detect a sign of the abnormality before the system breaks down, so that maintenance and repair can be performed in advance. Therefore, according to the pump station 1 provided with the fuel supply system 20, reliable operation is possible in the event of a flood, and high reliability can be obtained.

Further, in the present embodiment, as shown in FIG. 1, an internal combustion engine 4 installed at a position lower than the fuel dispensing tank 22 and a refueling pipe 40 for supplying fuel from the fuel dispensing tank 22 to the internal combustion engine 4 , And the return pipe 50 is connected to the refueling pipe 40, and the fuel is returned from the refueling pipe 40 to the fuel storage tank 21. In this way, by connecting the return pipe 50 to the refueling pipe 40 on the internal combustion engine 4 side, the fuel returns to the fuel storage tank 21 in a natural flow through the refueling pipe 40, so that an abnormality (fuel leakage) in the refueling pipe 40 occurs. Etc.) can be detected, which can contribute to the improvement of reliability for reliable starting and operation of the main pump 10. Further, in such a management operation mode, the fuel transfer pump 32, which is a rotating machine having a low operation frequency, is periodically operated to prevent the fuel transfer pump 32 from sticking and to check the state thereof, so that the equipment is deteriorated. It can also contribute to prevention.

Further, in the present embodiment, after measuring the oil level drop time ΔT1, the control device 100 closes the return pipe 50 by the opening / closing device 51, drives the fuel transfer pump 32, and raises the oil level of the fuel dispensing tank 22. Since the oil level rise time ΔT2 from the low level L to the high level H is periodically measured and a sign of a system abnormality is detected based on the change in the oil level rise time ΔT2, the refueling pipe 40 is used. It is possible to detect not only the sign of abnormality but also the sign of abnormality in the fuel pumping pipe 30 and the deterioration of the performance of the fuel transfer pump 32.
Further, in the present embodiment, the control device 100 performs an interlock process so that the management operation mode is not executed in the normal operation mode in which the main pump 10 is driven. Therefore, when flood control is required due to heavy rain or the like. In addition, the management operation mode will not be executed.

Although preferred embodiments of the present invention have been described and described above, it should be understood that these are exemplary and should not be considered as limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the scope of the invention. Therefore, the present invention should not be considered limited by the above description, but is limited by the claims.

For example, as in the pump station 1A according to the modified example shown in FIG. 4, the return pipe 50A is connected to the bottom of the fuel dispensing tank 22, and the fuel is directly returned from the fuel dispensing tank 22 to the fuel storage tank 21. There may be. In this case, it is possible to detect a sign of abnormality such as fuel leakage from the fuel dispensing tank 22.

Further, for example, in the above embodiment, a configuration for detecting a sign of a system abnormality based on changes in the oil level lowering time ΔT1 and the oil level rising time ΔT2 has been described. For example, the oil level lowering time ΔT1 and the oil level rising have been described. The configuration may be such that a sign of a system abnormality is detected based on a change in only one of the time ΔT2. Further, when detecting a sign of a system abnormality based only on the change in the oil level rise time ΔT2, the return pipe 50 and the switchgear 51 may be omitted.

Further, for example, in the above embodiment, the case where the fuel supply system 20 of the present invention is applied to the pump station 1 is illustrated, but for example, the fuel supply system 20 of the present invention may be applied to an engine power generation facility or the like.

1 ... Pump station, 1A ... Pump station, 2 ... Suction water tank, 2a ... Water level detector, 3 ... Discharge water tank, 3a ... Water level detector, 4 ... Internal engine, 4a ... Drive shaft, 5 ... Reducer, 10 ... Main Pump, 11 ... Casing, 11a ... Suction port, 11b ... Flap valve, 12 ... Pump shaft, 12a ... Impeller, 13 ... Discharge valve, 20 ... Fuel supply system, 21 ... Fuel storage tank, 21a ... Oil level detector, 22 ... Fuel small tank, 22a ... Oil level detector, 30 ... Piping, 31 ... Strainer, 32 ... Fuel transfer pump, 40 ... Refueling piping, 41 ... Strainer, 50 ... Piping, 51 ... Opening and closing device, 60 ... Control device, 100 ... Control device, H ... High level, L ... Low level, ΔT1 ... Oil level drop time, ΔT2 ... Oil level rise time, θ ... Difference

Claims (5)

A fuel storage tank that stores fuel and
A fuel small discharge tank installed at a position higher than the fuel storage tank, and
A constant-volume fuel transfer pump that transfers fuel from the fuel storage tank to the fuel dispensing tank, and
An oil level detector that detects at least the high level and the low level of the oil level in the fuel dispensing tank, and
A fuel supply system including a control device for driving the fuel transfer pump based on the detection result of the oil level detector.
A return pipe for returning fuel to the fuel storage tank from the lower level or lower of the fuel dispensing tank, and
A switchgear for opening and closing the return pipe is provided.
The control device opens the return pipe by the switchgear, periodically measures the oil level drop time from the high level to the low level of the oil level in the fuel dispensing tank, and periodically measures the oil level. A fuel supply system characterized by having a controlled operation mode that detects a sign of a system abnormality based on a change in a decrease time. An internal combustion engine installed at a position lower than the fuel dispensing tank,
A refueling pipe for supplying fuel from the fuel dispensing tank to the internal combustion engine is provided.
The fuel supply system according to claim 1, wherein the return pipe is connected to the refueling pipe and returns fuel from the refueling pipe to the fuel storage tank. After measuring the oil level drop time, the control device closes the return pipe by the opening / closing device, drives the fuel transfer pump, and the oil level of the fuel dispensing tank changes from the low level to the high level. The fuel supply system according to claim 1 or 2, wherein the oil level rise time is periodically measured, and a sign of a system abnormality is detected based on the change in the oil level rise time. .. The main pump, which is driven by an internal combustion engine and pumps water from the suction tank,
A pump facility including the fuel supply system according to any one of claims 1 to 3 for supplying fuel to the internal combustion engine.
The control device is a pump facility that performs an interlock process so that the management operation mode is not executed in the normal operation mode in which the main pump is driven. A fuel storage tank that stores fuel and
A fuel small discharge tank installed at a position higher than the fuel storage tank, and
A constant-volume fuel transfer pump that transfers fuel from the fuel storage tank to the fuel dispensing tank, and
It is a management operation method of a fuel supply system including an oil level detector that detects at least a high level and a low level among the oil level of the fuel dispensing tank.
A return pipe for returning fuel to the fuel storage tank from the lower level or lower of the fuel dispensing tank, and
A switchgear for opening and closing the return pipe is provided.
The return pipe is opened by the switchgear, the oil level drop time from the high level to the low level of the fuel dispensing tank is periodically measured, and the change in the oil level drop time is determined. A management operation method of a fuel supply system, which is characterized in that a sign of a system abnormality is detected based on the above.

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