Valve pressure testing issue
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There will be a major maintenance campaign on the equipment next month, and some valves require packing to be added on-site. Do these valves need to have their pressure settings adjusted again after the packing is added?
It is best to apply pressure again to determine its sealing performance； If the conditions do not permit it, carry out the pressure test along with the piping system.
Since the valve cover has been opened, it’s best to conduct a pressure test again! ! At least you can use it with a clear conscience! !
It is necessary to perform pressure testing again, because once the valve body is opened, it means that the sealing packing has changed; therefore, pressure testing must be carried out once more. It’s simple – just apply water pressure on site
Theoretically, it is necessary to carry out pressure testing again, but since you are adding fillers on site, it’s definitely not feasible to test each valve individually there. The only solution is to conduct a hydraulic test on the pipeline along with the equipment before starting operation.
Which company tests each valve after maintenance? Mainly, replace the seals and packing, and then after installation, conduct a pressure test with the system!
It’s definitely needed! Otherwise, inspect the sealing effect of the filler at lunchtime
If it is a valuable or hazardous medium, pressurization is required; for low-pressure water or low-pressure steam, simpler methods can be used.
Of course, suppression is necessary; the force applied to the valve plate is 1.25 times the nominal pressure, while the force applied to the valve body, the cover, and the packing is 1.5 times the nominal pressure.
Strongly agree with the view from Floor 9. Someone asked, \"Excuse me, after adding filler, is it necessary to reset the pressure of the valve?\" ”It’s just a matter of the pressure generated by the packing; it has nothing to do with other parts of the system. (It’s certain that the valves were in good condition during production.) As for the packing, any leakage in this area is addressed by adding more sealing material, so the situation will necessarily be better than before. Therefore, there’s no need for unnecessary pressure testing. (My personal opinion, for reference only)
During on-site maintenance, it is very difficult to pressure-test every single valve that needs to be serviced. It is generally determined based on the specific situation. If it is simply a replacement of the packing, then it’s a very simple task; once the maintenance is complete, the system just needs to be pressurized. :)
This data is very useful to me! Thank you!
The medium is vaporized gasoline and residue oil; it should be considered a hazardous medium!
Perhaps that’s what our leaders think!
It is sometimes impractical to operate the device to generate water pressure; conducting a leak test is sufficient. . .
It must be suppressed; if it is a toxic substance, it will pose a safety hazard after the vehicle is in use.
This situation is quite complex, and different approaches need to be adopted depending on the specific circumstances. First scenario: It is determined based on pressure requirements; high-pressure valves with packing must be tested under pressure before installation, while low-pressure valves do not require such testing. Second scenario: It is determined based on the properties of the medium; hazardous media must be pressurized, while non-hazardous media do not require pressurization. Third scenario: It is determined based on the scale of the maintenance work. For large-scale maintenance, it is not necessary to conduct pressure testing on each valve individually; testing can be carried out together with the entire system. For small-scale maintenance, however, each valve must be tested separately.