Can the valves be tested together when the pipeline pressure is tested?

OK! Generally speaking, the valve has more pressure than the pipe.

It can only be communicated with the supervisor, and the pressure test of the pipeline and the valve together can only be regarded as the pressure test of the pipe system.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

Theoretically, it can participate in the pressure test, this valve is also a component of the pipeline system, it also meets all the design requirements and construction requirements of the pipeline system, of course, it can follow the pipeline system together with the pressure test, which is no different from ordinary valves.

However, during the pressure test process, the valve should be protected, especially careful not to let debris fall into the valve seat. Once there is debris in the valve, it may cause damage to the valve when it is opened and closed in the future. There is also a pneumatic valve and an electric valve must be removed for cleaning after the pressure test, so it is better to dismantle it.

If you think about it, a high-precision electric valve or pneumatic valve is worth hundreds of thousands or even millions, and the cost of pressure testing work is not necessarily as high as the value of the valve, do you still have to take risks?

Yes, but the pressure testing process should be turned on in its entirety.

The pressure test method of the pipeline system should be formulated in accordance with the requirements of the national standards and specifications to develop a detailed pressure test plan, and the relevant standards of the pipeline system are mainly GB 50235-2010 industrial metal pipeline engineering construction specifications, see GB 50235-2010 for details.

According to the "SY0401-98 oil and gas pipeline construction and acceptance code" and the requirements are summarized as follows:

1. The length of the pipe section for pressure testing should not exceed 35km (water pressure test) and 18km (air pressure test) 2. The pressure value, pressure stabilization time and allowable pressure drop value of the sectional pressure test shall be determined according to the regional classification, please follow the provisions of the table in the standard.

3. The height difference of the pressure test pipe section should not be checked over 30m (water pressure test) 4. The ambient temperature of the pressure test should be above 5, otherwise anti-freezing measures should be taken.

5. There are regulations on the accuracy, range, installation position and installation environment of the pressure gauge for pressure testing.

6. Qualified standards for strength pressure test and strict reed flammability pressure test. The strength pressure test is qualified if the pipeline is not ruptured and there is no leakage; Tightness test pressure 1, the pressure drop is not less than 1%, and the test pressure value is qualified.

For the sake of me typing so many words, please add some points. Hehe.

1. It is to see whether your pipes and valves are leaking, 2. Whether the pressure can reach the pressure during construction, 3. Safety.

(1) Under normal circumstances, the valve is not tested for strength, but after repair, the valve body and bonnet or the corroded and damaged valve body and bonnet should be tested for strength. For safety valves, their constant pressure and return pressure and other tests should be in accordance with the provisions of their instructions and relevant regulations.

2) The strength and tightness test should be carried out for the valve installation. 20% spot check of low-pressure valves, and 100% inspection should be carried out if unqualified; Medium and high pressure valves should be 100% inspected.

3) During the test, the valve installation position should be in the direction that is easy to check.

4) For valves in the form of welded connections, when the pressure test with the plate is not possible, the cone seal or O-ring seal can be used for pressure test.

5) During the hydraulic test, the valve air should be excluded as much as possible.

6) The pressure should be gradually increased during the test, and it is not allowed to increase the pressure sharply and suddenly.

7) The duration of the strength test and the tightness test is generally 2 3min, and the important and special valves should last 5min. The test time of small-diameter valves can be correspondingly shorter, and the test time of large-diameter valves can be correspondingly longer. During the test, the test time can be extended if in doubt.

During the strength test, sweating or leakage of the valve body and bonnet are not allowed. The tightness test is only carried out once for the general valve of the rotary lobe pump, and the necessary valves such as safety valve and high-pressure valve need to be carried out twice. During the test, a trace amount of leakage is allowed for low-pressure, large-diameter unimportant valves and valves with regulations that allow leakage; Due to the different requirements of general valves, power station valves, marine valves and other valves, the leakage requirements should be implemented in accordance with the relevant regulations.

8) The throttle valve should not be tested for the tightness of the closing parts, but the strength test and the tightness test at the packing and gasket should be done.

9) In the pressure test, the closing force of the valve only allows a person's normal physical strength to close; Reinforcement with tools such as levers (except for torque wrenches) is not allowed, and when the diameter of the handwheel is greater than 320 mm, two people are allowed to close together.

10) The valve with the upper seal should take out the packing material for the tightness test, and check whether there is leakage after the upper seal is closed. When using gas for testing, fill the stuffing box with water for inspection. When the packing tightness test is carried out, the upper seal is not allowed to be in a tight position.

11) Where the valve has a driving device, the tightness test should be carried out by closing the valve with the driving device when testing its tightness. For manual actuators, the sealing test of the valve should also be carried out with dynamic closing.

12) The bypass valve installed on the main valve after the strength test and tightness test is carried out in the main valve; When the main valve shut-off is opened, it should also be opened.

13) During the strength test of cast iron valves, the valve body and valve cover should be tapped with a copper hammer to check whether there is leakage.

14) When the valve is tested, except for the plug valve, which is allowed to be oiled on the sealing surface, other valves are not allowed to be oiled on the sealing surface.

15) When the valve is tested, the compression force of the blind plate on the valve should not be too large, so as not to deform the valve and affect the test effect (if the cast iron valve is pressed too tightly, it will be damaged).

16) After the valve pressure test is completed, the water in the valve should be removed and wiped clean in time, and the test record should also be made.