CN210051489U - Nuclear power station valve pressure test leak detection device - Google Patents

Nuclear power station valve pressure test leak detection device Download PDF

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Publication number
CN210051489U
CN210051489U CN201920516006.2U CN201920516006U CN210051489U CN 210051489 U CN210051489 U CN 210051489U CN 201920516006 U CN201920516006 U CN 201920516006U CN 210051489 U CN210051489 U CN 210051489U
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CN
China
Prior art keywords
valve
flange
test
pressure testing
nuclear power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201920516006.2U
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Chinese (zh)
Inventor
宋平
尹延喜
李岚
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Individual
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Individual
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Publication date
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Priority to CN201920516006.2U priority Critical patent/CN210051489U/en
Application granted granted Critical
Publication of CN210051489U publication Critical patent/CN210051489U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model relates to a nuclear power station valve pressure testing leak hunting device, a serial communication port, the device arranges purpose-built pressure testing steel structural framework in, pressure testing valve (2) are pressed through last flange (1) and lower flange (3) and are closely sealed the back, pour into the pressure testing liquid medium into by last flange (1) and carry out the sealed face leak hunting test of valve, lower flange (3) are placed on the steel platform of drilling, lower flange (3) are collected and are discharged to graduated flask (4) through the lower part collecting tube revealing liquid, graduated flask (4) are placed on pressure testing steel structural bottom platform. The device can carry out valve housing test and sealing test, measures leaking the leakage quantity in the experiment, and the calculation leaks the rate, judges whether qualified through leaking the rate valve, discovers the valve that has the problem in advance, avoids nuclear power station installation and debugging and the interior sealed problem such as leaking of valve appearing during operation.

Description

Nuclear power station valve pressure test leak detection device
Technical Field
The utility model relates to a nuclear power station valve pressure testing leak hunting device.
Background
The third generation nuclear power introduced in China is designed by American West House company, and the American standard is used in the design. The subsequent nuclear power station digests and absorbs the third-generation passive nuclear power technology, is designed for localization, and adopts the American standard specification for the installation of the nuclear island. According to the American standard, a valve manufacturer needs to perform pressure testing according to the requirements of American society of mechanical Engineers standard ASMEB16.34 valve-flange and butt welding port before the valve leaves a factory, but does not have the pressure testing requirement before field installation. In the construction process of the nuclear power project, the problem of internal leakage of valves of the nuclear island part in the debugging and running process after installation is solved, and as the nuclear island system is complex in working condition and high in nuclear safety level, once the valves leak in the debugging and running process, the nuclear safety, cleanliness and other series problems need to be considered during processing, the processing difficulty is high, and the operation of the nuclear island system is influenced. Therefore, a pressure testing device for the nuclear island valve is needed, and a nuclear island construction contractor performs a shell test and a sealing test according to the requirements of ASME B16.34 before the valve is installed after arriving at the field, so that the sealing problems of valve internal leakage and the like during subsequent installation, debugging and operation are avoided.
Disclosure of Invention
The utility model aims at providing a nuclear power station valve pressure testing leak hunting device.
The utility model discloses can reach through following measure:
the test bench composed of a group of steel structures meets the requirements of valve pressure test operation on size and height, and meets humanized operation and test requirements. The specific structure form is shown in figure 1.
Test bench upper portion roof beam trompil and machining screw thread, then penetrate the lead screw, through the adjustable lead screw of lead screw top hand wheel upper and lower position to the realization is to the pressure test of the valve of co-altitude not. When the valve is used for pressure test, flange sheets with different specifications are selected according to the specifications and test pressures of different valves so as to meet different pressure test requirements. The center of the lower flange is provided with a leakage pipe for leading out leaked media during pressure testing, and a measuring cylinder is arranged below the leakage pipe and used for measuring leakage quantity so as to confirm whether the leakage rate of the valve meets the standard requirement or not.
Drawings
Fig. 1, fig. 2, fig. 3, and fig. 4 are schematic structural diagrams of the present invention.
In the figure: 1. an upper flange; 2. a test valve; 3. a lower flange (with a leak tube); 4. a measuring cylinder;
Detailed Description
The valve pressure test leak detection device of the present invention is further described with reference to the accompanying drawings
Except the utility model discloses a valve test bench device, the workshop should be equipped with the experimental instrument of adaptation valve, including electronic (manual) pressure testing pump, pressure testing connecting pipe, manometer, jack, mould, electric block, valve storage rack and other accessories and instrument, drainage facility etc.. The test rig and tools must be cleaned and not have materials that cause damage to the valve surfaces.
The upper flange (1) and the lower flange (3) are selected according to the specification and the model of the valve, the upper flange is provided with water holes and can be communicated with a pressure test valve, and the water hole machine screw thread is matched with a pressure test water pipe for use. The pressure gauge is arranged on the water inlet pipe, and the pressure gauge for the test must be checked and calibrated and has a metering calibration certificate. The precision is not less than 1.5 grade, the measuring range is 1.5-4 times of the test pressure, and the number is 2.
The stainless steel connecting pipe is selected for the test of the stainless steel valve, and the pressure test table and the pressure test tool are isolated by using the sealing gasket, so that the stainless steel valve is prevented from being polluted in the pressure test process.
When the valve working medium is liquid, the test medium is water; and according to the corresponding cleanliness levels of different systems, water with different levels of water quality is used for pressure testing. When the test medium is liquid, the air in the valve is exhausted before pressurization, and accumulated water in the valve is exhausted in time after the pressure test of the valve is finished; when the valve working medium is gas, the test medium adopts dry and oilless compressed air or nitrogen.
The valve seal is in when experimental the utility model discloses concrete operation on the pressure testing device is as follows:
1. the valve to be tested is vertically placed between the upper flange (1) and the lower flange (3), a sealing gasket is used for sealing between the valve and the flanges, and the valve is compressed and fixed by rotating the upper lead screw.
2. And closing the valve, filling the cavity on one side of the detected sealing pair with a test medium, gradually pressurizing to test pressure, and checking the leakage condition on the other side of the detected sealing pair after reaching the pressure maintaining time. For a valve with a specified medium flowing direction, introducing a medium and applying pressure according to the specified medium flowing direction; for valves where no media flow direction is specified, media should be introduced and pressure applied along each end, respectively; the check valve should introduce the medium and apply pressure in a direction that closes the flap, the valve being in a closed state during the test.
When the valve shell is tested, the valve is in an opening state, the check valve introduces media and applies pressure along the direction of opening the valve clack, other valves are in a partial opening state, and the pressure test operation process is the same as that of a valve sealing test.
When the test is carried out using a liquid as a medium, the amount of leakage at the time of the test can be directly measured by a measuring cylinder, and the amount of water drops can be calculated when the amount of leakage is low and calculated as 1ml to 16 drops. When the test is carried out by using gas as a medium, water can be injected into the measuring cylinder, the lower end of the leakage pipe is immersed into the water, the depth is 3-6 mm, the pipe shaft is vertical to the water surface, and the leakage amount is calculated according to the number of bubbles passing through 1 ml-100 bubbles.
The test time and leak rate standards are usually given in the specification of valve design or the specification of the valve manufacturer, and when not required in the relevant documents, the standards may be applied to the American Petroleum institute Standard API 598 "inspection and testing of valves". The valve leakage rate can be calculated through the leakage amount measured in the test and the test time, and whether the valve leakage rate is qualified or not is judged.
After the pressure test is finished, the outlet flange is loosened, the valve is taken down, the test medium (water) flows to the platform panel, and the test medium (water) can be led out through the arranged drain pipe.

Claims (4)

1. The utility model provides a nuclear power station valve pressure testing leak hunting device, its characterized in that, the device arranges in purpose-made pressure testing steel structural framework, pressure testing valve (2) are pressed through upper flange (1) and lower flange (3) and are closely sealed the back, pour into the pressure testing liquid medium into by upper flange (1) and carry out valve sealing face leak hunting test, lower flange (3) are placed on the steel platform of drilling, lower flange (3) are collected and are discharged to graduated flask (4) through the lower part collecting tube revealing liquid, graduated flask (4) are placed on pressure testing steel structural bottom platform.
2. The pressure test and leak detection device for the valve of the nuclear power plant as claimed in claim 1, characterized in that: the upper flange (1) is a carbon steel flange, and a channel for pressure test liquid to enter the pressure test valve is drilled in the flange.
3. The pressure test and leak detection device for the valve of the nuclear power plant as claimed in claim 1, characterized in that: the lower flange (3) is a polytetrafluoroethylene flange, the upper surface of the flange is provided with a slope, and the lower surface of the flange is provided with a discharge pipe, so that leaked liquid media can be collected, discharged and leaked.
4. The pressure test and leak detection device for the valve of the nuclear power plant as claimed in claim 1, characterized in that: the measuring cylinder (4) collects the leaked liquid medium and the reading is carried out through the scale on the measuring cylinder (4).
CN201920516006.2U 2019-04-16 2019-04-16 Nuclear power station valve pressure test leak detection device Expired - Fee Related CN210051489U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920516006.2U CN210051489U (en) 2019-04-16 2019-04-16 Nuclear power station valve pressure test leak detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920516006.2U CN210051489U (en) 2019-04-16 2019-04-16 Nuclear power station valve pressure test leak detection device

Publications (1)

Publication Number Publication Date
CN210051489U true CN210051489U (en) 2020-02-11

Family

ID=69380681

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920516006.2U Expired - Fee Related CN210051489U (en) 2019-04-16 2019-04-16 Nuclear power station valve pressure test leak detection device

Country Status (1)

Country Link
CN (1) CN210051489U (en)

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GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20200211

Termination date: 20210416