KR100540308B1 - Apparatus for a test of leakage of presser safety valve and pressure setting up - Google Patents

Abstract

The present invention relates to an apparatus for testing leakage and pressure setting of a pressurizer safety valve which enables the pressurizer safety valve to directly perform a leakage test and a pressure setting test at room temperature. The present invention relates to a pressurizer safety valve having a flange for checking leakage. A leak and pressure setting test apparatus, comprising: a nitrogen gas storage unit for storing nitrogen gas; A pump which is connected to the nitrogen gas storage unit and pumps the nitrogen gas up to the leakage and pressure setting test value of the pressurizer safety valve, and discharges the pumped nitrogen gas to the pressure storage tank; A pressure storage tank for storing nitrogen gas discharged from the pump; A pressure control valve connected to the pressure storage tank to adjust the pressure of nitrogen gas discharged from the pressure storage tank and discharge the adjusted nitrogen gas to an injection tube installed on the side of the bench for leakage and pressure setting test through a high pressure hose; ; Leakage and pressure setting test bench for injecting the leakage and pressure setting nitrogen gas injected from the pressure control valve into the lower portion of the pressurizer safety valve seated on the upper surface thereof to test the leakage nitrogen and the pressure setting nitrogen amount of the pressurizer safety valve. It consists of.

Pressurizer safety valve, bench, flange, nitrogen gas storage, pump

Description

Apparatus for a test of leakage of presser safety valve and pressure setting up}             

Figure 1 is a schematic diagram schematically showing the configuration of one embodiment of the leakage and pressure setting test device of the pressurizer safety valve according to the present invention,

Figure 2 is a perspective view of the bench for leakage and pressure setting test of Figure 1,

Figure 3 is a perspective view of the leak check flange of Figure 1,

Figure 4 is a schematic diagram schematically showing the configuration of another embodiment of the leakage and pressure setting test device of the pressurizer safety valve according to the present invention,

5 is a perspective view of the stand for mounting the bonnet assembly of FIG.

Figure 6a is a tool for wrapping the seat upon removal of the upper structure of the pressurizer safety valve of Figure 4,

FIG. 6B is a tool for wrapping a disc upon removal of the upper structure of the pressurizer safety valve of FIG. 4. FIG.

<Explanation of symbols for the main parts of the drawings>

10: nitrogen gas storage unit

20: pressurizer safety valve

30: pump

40: pressure storage tank

50: pressure regulating valve

52: high pressure hose

60: bench for leakage and pressure setting test

62: injection tube

70: Leak check flange

The present invention relates to an apparatus for testing leakage and pressure setting of a pressurizer safety valve of a power plant. More specifically, the pressure and safety setting of a pressurizer safety valve, which enables the pressurizer safety valve to directly perform a leak test and a pressure setting test at room temperature. It relates to a test apparatus.

In general, the pressurizer safety valve is a very important facility that controls the safe operation of the pressure facility and the fluid transfer system of power plants and industrial facilities. Recently, as safety regulations of nuclear power plants are strengthened, accurate performance tests on various safety valves are required. . In particular, the main steam and pressurizer safety valves are directly connected to the safe operation of nuclear power plants and are very important facilities that affect the output reduction and stop depending on the situation. Therefore, it is urgently necessary to develop suitable equipment for accurate data acquisition and performance diagnosis in this field. Do.

Currently, pressurizer safety valve testing by ANSI / ASME PTC-25.6 Appendix B and ASME OMCode (1990) is performed by test equipment such as air motors or hydro-sets under the operating pressure of the plant, such as main steam and pressurizer safety valves.

However, the conventional leak and pressure setting test device of the pressurizer safety valve has a problem that it is impossible to measure the minute instantaneous pressure change of the pressure and system pressure of the air motor.

In addition, in the opening test, since the opening and closing pressure values are determined to be opening sounds instead of opening displacements, accurate opening and closing pressure values cannot be measured. In addition, there is a problem in that it is impossible to accurately measure according to the characteristics of the valve (Chattering, Simmering, Blowdown, etc.) because the axial movement point of the spindle cannot be measured at all.

In addition, during the opening test, since the measured pressure is substituted into the differential pressure conversion table in the noise environment to check the set pressure value, there is a problem that there is always a risk of incorrect setting due to human error in the calculation process.

In particular, the leak and pressure setting tester of the conventional pressurizer safety valve is a test for verifying the performance of the pressurizer safety valve while the system is completely satisfied with the operating conditions, and a large time and economic loss occurs when the initial start fails. And, it was difficult to maintain stable performance.

Therefore, the present invention has been proposed to solve the above-mentioned problems according to the prior art, an object of the present invention is to leak the pressurizer safety valve which allows the pressurizer safety valve to directly perform the leakage test and the pressure setting test at room temperature And a pressure setting test apparatus.

Features of the leakage and pressure setting test device of the pressurizer safety valve according to the present invention for achieving the above object,
In the leakage and pressure setting test device of the pressurizer safety valve equipped with a leak checking flange,
A nitrogen gas storage unit 10 for storing nitrogen gas;
A pump connected to the nitrogen gas storage unit 10 to boost and pump nitrogen gas up to the leakage and pressure setting test value of the pressurizer safety valve 20 and discharge the pumped nitrogen gas to the pressure storage tank 40 ( 30);
A pressure storage tank 40 for storing nitrogen gas discharged from the pump 30;
Connected to the pressure storage tank 40 to adjust the pressure of the nitrogen gas discharged from the pressure storage tank 40 and the adjusted nitrogen gas through the high pressure hose 52 of the leakage and pressure setting test bench 60 A pressure control valve (50) for discharging to the injection pipe (62) installed at the side;
The leakage and pressure setting nitrogen gas injected from the pressure regulating valve 50 is injected into the lower portion of the pressurizer safety valve 20 seated on the upper surface thereof to test the leakage nitrogen amount and the pressure setting nitrogen amount of the pressurizer safety valve 20. It is composed of a bench 60 for leakage and pressure setting test.

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Hereinafter, with reference to the accompanying drawings a preferred embodiment of the leakage and pressure setting test device of the pressurizer safety valve according to the present invention.

Figure 1 is a schematic diagram schematically showing the configuration of one embodiment of the leakage and pressure setting test apparatus of the pressurizer safety valve according to the present invention.

As shown in FIG. 1, the leak and pressure setting test apparatus of the pressurizer safety valve according to the present invention is connected to the nitrogen gas storage unit 10 and the nitrogen gas storage unit 10 storing nitrogen gas and nitrogen. Pump 30 boosts and pumps the gas up to the leak and pressure setting test value of the pressurizer safety valve 20 and discharges the pumped nitrogen gas to the pressure storage tank 40 which will be described later, and from the pump 30. A pressure storage tank 40 for storing the discharged nitrogen gas, and is connected to the pressure storage tank 40 to adjust the pressure of the nitrogen gas discharged from the pressure storage tank 40 and the adjusted nitrogen gas to the high pressure hose Pressure control valve 50 for discharging to the injection pipe 62 installed on the side of the leakage and pressure setting test bench 60 to be described later through the 52 and the leakage and pressure setting received from the pressure control valve 50 Pressurized nitrogen gas seated on its upper surface A bench 60 for leakage and pressure setting test to test the leakage nitrogen and the pressure setting nitrogen amount of the pressurizer safety valve 20 by injecting the lower portion of the safety valve 20, and the work of the pressurizer safety valve 20. Is installed on the side is composed of a leakage check flange 70 for checking whether the nitrogen gas leaks from the pressurizer safety valve (20).

As shown in FIG. 2, the leakage and pressure setting test bench 60 includes a rectangular rectangular plate 60-1 on which the pressurizer safety valve 20 is seated, and the rectangular plate 60-1. A handle 60-3 installed at both sides of the center and easily moved by a user, and a support table installed at a bottom corner of the square plate 60-1 to support the square plate 60-1. 60-5).

On the other hand, the support 60-5 of the bench 60 for the leakage and pressure setting test is screwed to be detachably installed on the square plate 60-1.

In addition, the square plate 60-1 is formed in a circular shape so as to protrude so that the lower portion of the pressurizer safety valve 20 is in close contact with the center of the upper surface of the square plate 60-1, and one side thereof. A pressure accumulator 60-9 for injecting nitrogen gas into the lower part of the pressurizer safety valve 20 and having a hollow part 60-7 therein and a close contact with the side edges of the accumulator 60-9 are installed. And a seal portion (eg, a gasket) 60-11 to pressurize the pressure from the pressurizer safety valve 20 so as to prevent the pressure from escaping from the pressurizer safety valve 20, and a “b” type at an inner side of the square plate 60-1. And a supply line (not shown) connected to the hollow portion 60-7 of the accumulator 60-9 to supply nitrogen gas to the hollow portion 60-7, and the supply line; It is installed on the side of the square plate (60-1) so that it can be connected to and supply nitrogen gas to the supply line through the high pressure hose (52). It consists of the injection pipe (60-13).

On the other hand, as shown in Figure 3, the leakage check flange 70 is a circular disc 70-1 is installed on one side of the pressurizer safety valve 20 and the edge of the disc 70-1 Installed in the center of the surface is composed of a handle 70-3 that the user can easily move.

In addition, the disc 70-1 is formed on one side of the upper surface of the disc 70-1, and includes a rectangular box-type water tank 70-5 for storing a predetermined amount of water, and the disc 70-1. A hollow portion (not shown) is formed to have a predetermined length on the central inner surface of the pressurizer safety valve 20 and discharges nitrogen gas leakage from the pressurizer safety valve 20, and a center of the upper surface of the disc 70-1. Leakage check tube that is installed in connection with the hollow portion and one side thereof is located in the water of the reservoir (70-5) to check the leakage of nitrogen gas discharged through the hollow portion of the disc 70-1 ( 70-7).

Referring to the installation process and operation of the leakage and pressure setting test device of the pressurizer safety valve configured as described above are as follows.

First, the leakage and pressure setting test bench 60 is placed in a proper place so that the leakage and pressure setting test of the pressurizer safety valve can be performed at room temperature.

Then, the pressurizer safety valve 20 provided with the leakage check flange 70 is positioned on the upper surface of the leakage and pressure setting test bench 60.

At this time, the lower portion of the pressurizer safety valve 20 is preferably located on the upper surface of the accumulator 60-9 formed on the square plate 60-1 of the bench 60 for the leakage and pressure setting test.

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On the other hand, the high-pressure hose 52 for supplying nitrogen gas to one side of the injection pipe (60-13) of the leakage and pressure setting test bench 60 is installed.

Then, the pressure control valve 50 for adjusting the pressure of the nitrogen gas on one side of the high pressure hose 52, the pressure storage tank 40 for storing the nitrogen gas, the nitrogen gas storage unit 10 is connected to the nitrogen gas Pump 30 to pump up the pressure of the pressurizer safety valve 20 to the leakage and pressure setting test value and discharge the pumped nitrogen gas to the pressure storage tank 40, nitrogen gas storage unit for storing nitrogen gas ( 10) Install.

Therefore, nitrogen gas is supplied to the injection pipe 60-13 of the square plate 60-1 through the high pressure hose 52.

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And, the nitrogen gas supplied to the injection pipe (60-13) is the hollow portion of the accumulator (60-9) through a supply line formed in the "b" type on one side of the inside of the square plate (60-1) ( 60-7).

Accordingly, the nitrogen gas supplied to the hollow portion 60-7 of the accumulator 60-9 is supplied to the lower side of the pressurizer safety valve 20 and also supplied to the side of the pressurizer safety valve 20.

At this time, the leakage check flange 70 checks whether nitrogen gas leaks from the side of the pressurizer safety valve 20.

The leakage checking flange 70 is installed in the center of the circular disk 70-1 and the rim surface of the disk 70-1 inserted and fixed to one side of the pressurizer safety valve 20 to facilitate the user. It consists of a handle (70-3) that can move, if the nitrogen gas is counted to the side of the pressurizer safety valve 20, nitrogen to the hollow formed in a predetermined length on the central inner surface of the disc 70-1 The gas is discharged.

Accordingly, nitrogen gas leaks into the leak checking tube 70-7 connected to the hollow part.

And, a part of the leak check tube (70-7) is located in the water of the reservoir (70-5) formed on one side of the upper surface of the disc (70-1) bar, bubbles in the reservoir (70-5) Is generated.

Thus, the user measures the number of bubbles to measure the amount of leakage of the pressurizer safety valve 20. In this case, the maximum allowable leakage amount should be within 10 drops (bubbles) per minute.

If, as a result of testing the pressurizer safety valve 20 in the leakage and pressure setting test bench 60, the dissatisfied matter, that is, leakage, as shown in Figure 4, the upper structure of the pressurizer safety valve 20 Disassemble the whole and place it on the stand for placing the bonnet assembly.

Figure 4 is a schematic diagram schematically showing the configuration of another embodiment of the leakage and pressure setting test apparatus of the pressurizer safety valve according to the present invention.

As shown in FIG. 4, the nitrogen gas storage unit 10 storing nitrogen gas and the nitrogen gas storage unit 10 are connected to the nitrogen gas storage unit 10 to leak nitrogen and the pressure setting test value of the pressurizer safety valve 20. A pump 30 for pumping up to a value and discharging the pumped nitrogen gas to a pressure storage tank 40 to be described later, a pressure storage tank 40 for storing nitrogen gas discharged from the pump 30, and It is connected to the pressure storage tank 40 to adjust the pressure of the nitrogen gas discharged from the pressure storage tank 40 and the adjusted nitrogen gas is a high pressure hose 52 and the bottom surface of the bonnet assembly settle stand 100 to be described later Leakage of the pressure regulating valve 50 to discharge to the lower portion of the pressurizer safety valve 20 through the seating hole (100-2) installed in the pressurizer, the pressurizer safety valve 20 seated in the seating hole (100-2) Bonnet to test nitrogen and pressure setting nitrogen Consists of the assembly anchiyong stand 100.

As shown in FIG. 5, the bonnet assembly settling stand 100 has a quadrangle having a circular seating hole 100-2 in the center thereof so that a lower portion of the pressurizer safety valve 20 in which the upper structure is disassembled can be seated. Square plate (100-4) of the upper, the handle (100-6) is installed in the center of both sides of the square plate (100-4) and the user can easily move, and the square plate (100-4) A support 100-8 installed on the bottom square corner to support the square plate 100-4, and a wheel 100-installed on the bottom of the support 100-8 so as to be easily moved by a user. 10).

On the other hand, the support stand 100-8 of the bonnet assembly settling stand 100 is screwed to be detachably installed on the square plate 100-6.

In particular, the wheel 100-10 of the bonnet assembly settle stand 100 is screwed to be detachably installed on the support (100-8).

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Referring to the installation process and operation of the leakage and pressure setting test device of the pressurizer safety valve according to the present invention configured as described above are as follows.

First, as a result of testing the pressurizer safety valve 20 on the leakage and pressure setting test bench 60, when leakage occurs, the entire upper structure of the pressurizer safety valve 20 is disassembled and seated on the stand 100 for seating the bonnet assembly. Let's do it.

At this time, the nozzle seat (not shown) and the disk (not shown) are visible in the upper structure of the pressurizer safety valve 20. The nozzle seat and the surface of the disk are shown in FIGS. 6A and 6B. Lapping tools 102 and 104 are used for lapping.

Here, the nozzle and the disk lapping tool 102, 104 is subjected to a kneading process for easy handling on the side, the material was used for the malleable malleable material.

In addition, the nozzle and the disk lapping tool 102, 104, the inner diameter and the outer diameter were machined to the size suitable for the nozzle seat and disk, and was manufactured with an appropriate weight to avoid damage to the sealing surface due to gun friction during lapping.

In addition, one side lower portion of the pressurizer safety valve 20 of the upper structure is accommodated in the seating hole (100-2) of the stand 100 for the bonnet assembly.

In addition, a high pressure for removing one component of the pressurizer safety valve 20 accommodated in the seating hole 100-2 of the stand 100 for placing the bonnet assembly and supplying nitrogen gas to the lower portion of the pressurizer safety valve 20 Install the hose 52.

Then, the pressure control valve 50 for adjusting the pressure of the nitrogen gas on one side of the high pressure hose 52, the pressure storage tank 40 for storing the nitrogen gas, the nitrogen gas storage unit 10 is connected to the nitrogen gas Pump to boost the pressure of the pressurizer safety valve 20 to the leakage and pressure setting test value, and discharge the pumped nitrogen gas to the pressure storage tank 40, and the nitrogen gas storage unit storing nitrogen gas. (10) is installed.

Therefore, nitrogen gas is supplied to the pressurizer safety valve 20 seated in the seating hole 100-2 of the square plate 100-4 through the high pressure hose 52.

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As described above, the leak and pressure setting test device of the pressurizer safety valve according to the present invention can perform the leak test and the pressure setting test of the pressurizer safety valve directly at room temperature and in the field, so that the maintenance of the pressurizer safety valve can be performed quickly. It can work.

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In addition, the present invention is to perform a performance test at room temperature before starting the operation of the system or after the maintenance of the valve to contribute to stable operation at the initial start-up of the nuclear power plant, and after disassembly and maintenance, after confirming the performance rate of the safety valve after installation of the system In the test conducted, the result is satisfactory performance, which minimizes the initial start-up time.

Claims (11)

In the leakage and pressure setting test device of the pressurizer safety valve equipped with a leak checking flange, A nitrogen gas storage unit 10 for storing nitrogen gas; A pump connected to the nitrogen gas storage unit 10 to boost and pump nitrogen gas up to the leakage and pressure setting test value of the pressurizer safety valve 20 and discharge the pumped nitrogen gas to the pressure storage tank 40 ( 30); A pressure storage tank 40 for storing nitrogen gas discharged from the pump 30; Connected to the pressure storage tank 40 to adjust the pressure of the nitrogen gas discharged from the pressure storage tank 40 and the adjusted nitrogen gas through the high pressure hose 52 of the leakage and pressure setting test bench 60 A pressure control valve (50) for discharging to the injection pipe (62) installed at the side; The leakage and pressure setting nitrogen gas injected from the pressure regulating valve 50 is injected into the lower portion of the pressurizer safety valve 20 seated on the upper surface thereof to test the leakage nitrogen amount and the pressure setting nitrogen amount of the pressurizer safety valve 20. Leakage and pressure setting test device of the pressurizer safety valve, characterized in that consisting of a bench for the leakage and pressure setting test (60). The method of claim 1, The leakage and pressure setting test bench 60, A square rectangular plate 60-1 on which the pressurizer safety valve 20 is seated; A handle (60-3) installed at both centers of both sides of the square plate (60-1) so as to be easily moved by a user; Leakage and pressure setting test device of the pressurizer safety valve, characterized in that consisting of a support (60-5) is installed on the bottom four corners of the square plate (60-1) to support the square plate (60-1). The method of claim 2, The support 60-5 of the bench 60 for the leakage and pressure setting test, Leakage and pressure setting test device of the pressurizer safety valve, characterized in that the screw is fixed so that it can be detachably installed on the square plate (60-1). The method of claim 2, The square plate 60-1, The lower part of the pressurizer safety valve 20 is formed in a circular shape so as to protrude and be seated in close contact with the center of the upper surface of the square plate 60-1, and the hollow part 60-7 is provided at one side thereof. A accumulator 60-9 for injecting nitrogen gas into the lower portion of the pressurizer safety valve 20; A sealing part 60-11 installed close to the side edge of the accumulator 60-9 to pressurize the pressure from the pressurizer safety valve 20; It is formed in the inner side of the square plate (60-1) "n" and also connected to the hollow portion (60-7) of the pressure accumulator (60-9) nitrogen gas to the hollow portion (60-7) Supply line for supplying; It is installed on the side of the square plate (60-1) to be connected to the supply line and is characterized in that it consists of an injection pipe (60-13) for supplying nitrogen gas to the supply line through the high pressure hose (52) Leakage and pressure setting tester of pressurizer safety valve. delete delete The method of claim 1, Instead of the leakage and pressure setting test bench 60, Square plate 100-4 having a circular seating hole 100-2 at the center thereof so that the lower part of the pressurizer safety valve 20 in which the upper structure is disassembled, and the square plate 100-4 Is installed at both centers of both sides of the handle to easily move by the user, and the bottom plate of the square plate 100-4 supports the square plate 100-4. It is characterized in that the use of the bonnet assembly settle stand 100 consisting of a support (100-8), and the wheel (100-10) is installed on the bottom of the support (100-8) can be easily moved by the user. Leakage and pressure setting tester of pressurizer safety valve. The method of claim 7, wherein Support stand (100-8) of the bonnet assembly set stand 100, Leakage and pressure setting test device of the pressurizer safety valve, characterized in that the screw is fixed so that it can be detachably installed on the square plate (100-6). The method of claim 7, wherein The wheel 100-10 of the stand 100 for placing the bonnet assembly, Leakage and pressure setting test device of the pressurizer safety valve, characterized in that the screw is fixed so that it can be detachably installed on the support (100-8). delete The method of claim 7, wherein When the lower part of the pressurizer safety valve 20 in which the upper structure is disassembled is seated in the seating hole 100-2 of the square plate 100-4, the nozzle seat and the disk in the upper structure of the pressurizer safety valve 20. Leakage and pressure setting test device of the pressurized safety valve, characterized in that it further comprises a nozzle seat and a disk wrapping tool (102) (104) for wrapping the surface of the.

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