JPS6359454B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a test method for inspecting water pressure, pressure resistance of hydraulic piping, etc., and the presence or absence of leakage using an air-driven reciprocating booster pump, which will be described later. This relates to the test equipment used for the test.

The large number of high-pressure piping, hydraulic control equipment, impulse piping, instrumentation lines, etc. that deliver fluids such as oil and water used in power generation, petroleum, and other various plants are inspected every time a legal inspection or for safety reasons are carried out. Pressure resistance and leakage tests are performed by connecting high pressure generators and precision pressure gauges whenever necessary, but especially in recent years, as the required test pressure has increased, test equipment has also become larger. Tests are becoming more and more extensive.

Therefore, in place of conventional testing methods that require a lot of labor, there is a strong desire for a simple and reliable pressure resistance and leakage testing method.

The present invention was made in view of the above circumstances, and by introducing compressed air and moving a liquid piston until a predetermined liquid supply pressure and liquid discharge pressure are reached, the liquid suction and discharge stroke is repeated, and a predetermined liquid delivery pressure is achieved. Using a pump capable of supplying liquid at a discharge pressure of The present invention provides a test method and a test device used to carry out the method.

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings, and the test method of the present invention will be explained in conjunction with the instructions for using the test apparatus of the present invention.

FIG. 1 is a block diagram schematically showing the configuration of the test apparatus of the present invention. In this figure, 4 is a pump section, and the pump section 4 is composed of a compressed air-driven reciprocating booster pump, which will be described later. has been done.

The air inlet 41 communicating with the air cylinder 44B of the pump section 4 connects to the air intake 10 via the primary valve 2.
The intake port 10 is connected to a source of compressed air (not shown). A pipe line starting from this intake port 10 and reaching an air inlet 41 of the pump section 4 via a gas-liquid separation filter 11 is connected to the pump section 4.
An air introduction pipe A is configured to introduce compressed air supplied from a compressed air source (not shown) into the interior of the compressed air. 12 is a pressure regulating valve for reducing and adjusting the pressure of the compressed air supplied to the pump section 4; 13 is a compressed air whose pressure has been regulated by the pressure regulating valve 12; This is an on-off valve for use.

A communication path that branches from the air introduction pipe A outside the primary valve 2 and reaches the exhaust port 14 via the air outlet valve 9 is an air passage that releases the compressed air introduced into the air introduction pipe A to the atmosphere. This constitutes an exhaust pipe B.
Reference numeral 1 denotes a liquid storage tank, in which water or oil sucked into the pump section 4 and discharged from the pump section 4 is stored as necessary.

A suction conduit 6 communicating with the suction port of the pump section 4 is connected to the tank 1, and a liquid such as water or oil filled in the liquid storage tank 1 is transferred into the pump section 4 through the suction filter 5. It is made so that it can be inhaled.

On the other hand, the discharge port 48B of the pump section 4 is communicated with the discharge pipe C leading to the test pressure port 16 via the secondary valve 3, and from the outside of the secondary valve 3 of this discharge pipe C, there is no discharge. A drain pipe D is formed which communicates with the drain port 18 via the valve 15. This drainage pipe D
This discharges the liquid remaining in the water discharge pipe C to the outside when the operation of the pump section 4 is stopped.
Reference numeral E denotes a test pipe which is intended to supply the discharge pressure of the liquid discharged through the discharge pipe C by changing the diameter of the external connection, and is provided as necessary, and is not an essential requirement of the device of the present invention. do not have.

In this way, the device of the present invention is configured such that the pump section 4 is equipped with an air introduction pipe A, an air exhaust pipe B, a water discharge pipe C, and a drainage pipe D. By setting the air pressure, the discharge pressure of the liquid sucked and discharged by the pump section 4 can be determined.

7 arranged in the air introduction pipe A is a pump section 4
8 is a pressure gauge that displays the pressure of the compressed air introduced into the discharge pipe C, and 8 is a pressure gauge that displays the discharge pressure of the liquid discharged from the discharge pipe C.

The internal structure of the pump section 4 is as shown in FIG. 2, and includes an air piston 4 that reciprocates up and down by the introduction pressure of compressed air introduced into the pump section 4.
4A and the air cylinder 44B in which this air piston exists are watertight with a seal ring 45B, and as the air piston 44A reciprocates, the inlet 4
A liquid piston 45A is provided for discharging liquid sucked in from 8A from a discharge port 48B.

This pump section 4 introduces compressed air taken in from an air introduction port 41 into an air cylinder 44B through an air introduction path 43A, and uses the introduced pressure to push down an air piston 44A against the elastic force of a spring 44C. , moves the liquid piston 45A locked below the piston 44A downward, and shifts the operation of the pump section 4 to the discharge stroke,
The liquid sucked up from the suction port 48A is compressed and sent through the discharge port 48B into a pipe line to be measured (not shown) connected to the test pressure port.

In this way, when the liquid piston 45A reaches the bottom dead center, the restoring force of the spring 44C acts to return the piston 45A upward, and along with this, the liquid piston 45A also returns upward.
At this time, the switching valve 42 operates, and the air introduction path 43A
Since the compressed air in the air cylinder 44B is closed, the compressed air in the air cylinder 44B passes through the air exhaust path 43B, is further muffled in the air muffler 49, and is discharged to the atmosphere, and the pump section 4 shifts to the suction process.

Then, when the liquid piston 45A reaches the top dead center, the switching valve 42 operates again and the air exhaust path 43B
Since the air introduction passage 43A is opened, compressed air is introduced again from the air introduction port 41 and the above-described operation is repeated.

Thereafter, each time compressed air is introduced into the air cylinder 44B through the air introduction port 41, the same process is repeated at a high cycle, and when the discharge pressure reaches a certain pressure, that is, the introduced compressed air When the pressure and the discharge pressure are balanced, the pump section 4 stops its movement, and the discharge check valve 47 maintains the pressure of the liquid sent out from the discharge port 48B.

When the pump section 4 is stopped, the following approximate equation is satisfied, so the discharge liquid pressure of the pump section 4 and the air introduction pressure (pressure regulating valve output pressure) are determined by the disconnection of the liquid piston 45A. It is defined by the ratio between the area and the cross-sectional area of the air piston 44A.

(Discharged liquid pressure x Liquid piston cross-sectional area + Spring repulsive force = Pressure regulating valve output pressure x Air piston cross-sectional area However, since the spring repulsive force is much smaller than other forces, Discharged liquid pressure = Air piston cross-sectional area x (Pressure Regulating Valve Output/Liquid Piston Cross-sectional Area) Next, a method for pressure resistance and leakage testing of pressure distribution pipes using the apparatus of the present invention will be described.

One end of the blocked pipe 20 to be tested for pressure resistance and leakage is connected to the test pressure outlet 16, and the liquid (usually water or oil) to be supplied to the pipe 20 to be tested is transferred to a liquid storage tank. Filled with 1, 2
Next valve 3 and release valve 15 are closed. Next, the pressure regulating valve 12, the blocking valve 13, the primary valve 2, and the release valve 9 are all placed in a closed state. Then, after piping is connected from a compressed air source (not shown) to the supply connection port 10, the pressure regulating valve 12 is slightly opened, and then the blocking valve 13 is opened, and the pressure gauge 7 indicates the output pressure of the pressure regulating valve at that time. The pressure regulating valve 12 is adjusted so that the value satisfies the following: pressure regulating valve output pressure=liquid piston cross-sectional area×required test pressure/air piston cross-sectional area. After confirming that the pressure gauge 7 indicates a value that satisfies the above equation, the primary valve 2 is opened, and the pump section 4 begins to move according to the principle described above.

Thus, the air piston 44A and the liquid piston 4
5A continues its reciprocating motion, the liquid sucked into the pump section 4 is sent into the tube to be inspected, and the pressure of the discharged liquid gradually increases. As the pressure of this discharged liquid increases, the aforementioned process cycle of the pump section 4 gradually decreases, and the pump section 4
When the compressed air pressure introduced into the pump and the discharge liquid pressure are balanced, that is, when the formula of discharge liquid pressure × liquid piston cross-sectional area = air piston cross-sectional area × pressure regulating valve output pressure is established, the operation of the pump section 4 is as follows. Stop.

After the operation of the pump section 4 has stopped, observe the operation state of the pump section 4 for a while, and if the pump section 4 operates at a slightly constant cycle, there is a leak in the pipe to be inspected. If the pump section 4 does not operate at all after that, it can be determined that there is no leakage in the pipe to be inspected.

It will be easily understood that the operation of the pump section 4 in this case is such that, if the leakage of the pipe to be inspected is severe, the pump section 4 continues to move indefinitely and may not come to a stopped state. It goes without saying that the same method can be used to test the withstand pressure of the tube to be inspected.

The test method of the present invention can test the pressure resistance and presence or absence of leakage with the simple steps described above, so it can be used as a pressure resistance and leakage test method for many high-pressure pipes, hydraulic control equipment, etc. used in large-scale plants. is optimal.

Furthermore, the testing apparatus of the present invention has the following advantages.

1. It can be made compact, and if it is assembled all at once into a portable case, it is much lighter and easier to transport than current high-pressure test equipment.

2. Electricity or other power sources are not required as the driving force for operation and testing; it is sufficient to have compressed air for control, which is generally installed in parallel in the plant.

3. Test pressure can be easily adjusted using only a pressure regulating valve.

4. The test pressure drop in the withstand pressure test is automatically corrected, so you can save yourself the trouble of replenishing it every time.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the schematic structure of the apparatus of the present invention, and FIG. 2 is a longitudinal sectional side view showing the structure of the pump section. Explanation of symbols, 4...Air-driven reciprocating booster pump (pump part), 10...Air intake port, 1
4...Exhaust port, 16...Test pressure outlet, 20...
Pipeline to be inspected, 41...Air inlet, 44B...
Air cylinder, 45A...Liquid piston, 48A
...Liquid inlet, 48B...Liquid discharge port, A...
Air introduction pipe, B... Air exhaust pipe, C...
Discharge pipe line, D... Drain pipe line.

Claims (1)

[Claims] 1. Inspecting pressure resistance and leakage conditions of pressure pipes, etc. using an air-driven reciprocating booster pump that can supply a predetermined liquid discharge pressure by introducing compressed air and moving a liquid piston. It is a method to
The liquid discharge port of the pump is connected to the blocked pipe line to be inspected at one end, and compressed air is supplied from the air inlet of the pump to move the liquid piston of the pump. discharging the liquid sucked through the suction port from the liquid discharge port to supply a predetermined discharge liquid pressure to the inspection pipe;
Thereafter, by observing the operating state of the pump, the pressure resistance or leakage state of the pipeline to be inspected can be inspected. 2. A pump unit connected to a compressed air source and capable of supplying a predetermined discharge liquid pressure by moving a liquid piston provided in the air cylinder each time compressed air is introduced into the air cylinder. An air introduction pipe whose end originates from the air intake port and communicates with the air cylinder; an air exhaust pipe which branches off from the middle of the air introduction pipe and communicates with an exhaust port that communicates with the atmosphere; A discharge pipe that originates from the test pressure outlet connected to one end of the pipe to be inspected and communicates with the liquid discharge port of the pump section, and a discharge pipe that branches from the middle of this discharge pipe and runs through the drain port. Pressure leak test equipment for pressure pipes, etc. equipped with a drainage pipe line leading to the atmosphere.