JPH0230750Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a leak detection device for pumping piping.

(b) Conventional technology Conventionally, at gas stations, etc., tanks are buried underground, and pumping piping that communicates between a pump for pumping and the tank is also buried underground.

(c) Problems that the invention aims to solve As a result, it has been difficult to inspect the presence and size of leaks in the pumping piping.

In addition, because it is buried underground, there is no way to detect leakage during use due to corrosion, etc.

(d) Means for solving the problem In this invention, an air separator is interposed between the pump for pumping out the contents from the tank and the measuring device for measuring the pumped amount, and The discharged air is guided to a micro-pressure detection device, which connects a transparent measuring tube with its bottom end open into the water and the top end open to the atmosphere into a sealed container filled with water, and connects it to the wall of the container. erected through the
It is an object of the present invention to provide a leak detection device for a pumping pipe configured to detect leakage in the pumping pipe that communicates a tank and a pump due to a rise in the water level in the pipe.

(e) Effect In this device, when the pump operates, negative pressure is generated in the pumping pipe, and if there is a leak in the pipe, air is sucked in from the leakage point, and this air is provided on the discharge side of the pump. The water is separated by an air separator and guided to a micro-pressure detection device, which applies pressure to the surface of the water sealed in the airtight container of the device, causing the water level in the measuring tube to rise. Therefore, the magnitude and presence or absence of leakage can be detected based on the slow rate of rise of the water surface in the measurement tube.

(F) Effect According to this invention, air from the air separator installed on the discharge side of the pump is guided to a micro-pressure detection device, and the existence and size of leakage can be detected from the rate of rise of the water surface in the measurement tube of the device. Therefore, it is possible to easily perform a leakage test, which has been difficult in the past, and furthermore, the same test can be performed while the pump is in use.

(G) Example The example of the present invention will be explained in detail based on the drawings.
A indicates a gas station, where gasoline stored in a tank 1 buried underground is pumped out by a pump 3 disposed inside the weighing station 2 via a pumping pipe 19, and the discharge side of the pump 3 is pumped out. Gasoline and air are separated by an air separator 4 connected in communication with the gasoline, and the gasoline is supplied to a vehicle etc. via a meter 5 and a fuel supply hose 6, and the air is supplied to a low pressure detection device B via a hose 7. be guided.

The low pressure detection device B includes a hose 7 from the air separator 4 to the upper lid 9 of the airtight container 8 made of a transparent material.
are connected to the inside of the container 8 and the air separator 4.
Furthermore, a measurement tube insertion hole is formed in the upper lid 9 and the measurement tube 10 is inserted therethrough, and the lower end 11 of the tube 10 is connected to the water 1 sealed in the airtight container 8.
The upper end 13 of the tube 10 extends upward and is open to the atmosphere.

In particular, the pumping pipe 19 interposed between the tank 1 and the pump 3 is buried underground and is not exposed to the outside, so it cannot be easily inspected once the equipment construction at gas station A is completed. It's summery.

In addition, in the figure, 14 is a socket for resetting, 15 is a screw cap for tightening the measuring tube 10, 16 is an O-ring for maintaining airtightness, 17 is a fuel supply pipe for refilling the tank 1 with gasoline, and 18 is an air vent. shows.

The embodiment of this invention is constructed as described above, and when the pump 3 is operated, the pumping pipe 19
There is a negative pressure inside, and if there is a leak in the pipe 19, air will be mixed into the gasoline sucked into the pump 3. Since this air is discharged from the pump 3 together with gasoline, it is separated into gas and liquid by the air separator 4 interposed between the pump 3 and the meter 5, and the gasoline is supplied to the vehicle etc. via the refueling hose 6. , the air is guided to a low pressure detection device B. Since the air separator 4 is located on the discharge side of the pump 3, the separated air also has positive pressure, which applies pressure to the surface 20 of the water 12 in the closed container 8 of the device B. The water in the pipe 10 is pushed up to raise the water level 21 in the pipe.

Since the measuring tube 10 is transparent, this water level rise can be easily observed from the outside, and this water level 21
If there is no rise in water level, it can be seen that there is no leakage in the pumping pipe 19, and the extent of the leakage can be determined based on the slow rate of rise in the water level 21. Also,
The pot 14 is used to open the pot 14 to communicate the inside of the closed container 8 with the atmosphere, and to lower the water level 21 in the measuring tube in preparation for the next measurement.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a low pressure detection tank according to the present invention, and FIG. 2 is an explanatory diagram showing the arrangement of a gas station. B: Low pressure detection device, 1: Tank, 4: Air separator, 5: Measuring instrument, 8: Sealed container, 10: Measuring tube, 11: Lower end of same, 12: Water, 13: Upper end of measuring tube, 19: Pumping out Piping for use.

Claims (1)

[Scope of utility model registration request] Pump 3 for pumping the contents from tank 1
An air separator 4 is interposed between the air separator 4 and a measuring device 5 for measuring the pumped amount, and the air discharged from the separator 4 is guided to a micro-pressure detection device B, which detects water 12. Sealed container 8
Then, a transparent measuring tube 10 whose lower end 11 is open into the water 12 and whose upper end 13 is open to the atmosphere is placed in the same container 8.
The pipe is erected by penetrating the wall of the pipe 10 and the inner water surface 2
A pumping piping leak detection device configured to detect leakage of a pumping piping 19 that communicates a tank 1 and a pump 3 due to the rise of the pump 1.