why must globe & gate vale must be open duratin in test
why must globe & gate vale must be open duratin in test
(OP)
in piping we full open the gate & and globe valve
after that we test the line
why?
after that we test the line
why?
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why must globe & gate vale must be open duratin in test
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RE: why must globe & gate vale must be open duratin in test
RE: why must globe & gate vale must be open duratin in test
RE: why must globe & gate vale must be open duratin in test
RE: why must globe & gate vale must be open duratin in test
Using raised face flange with flat face
Thread378-13410
Flat face and raised face
Thread378-29732
RE: why must globe & gate vale must be open duratin in test
RE: why must globe & gate vale must be open duratin in test
You cannot belive that these two valves even if they are adjacent, will hold the pressure. No matter how tight you close, they will pass and they do pass. Even if these two valves pass two drops of water, you can see noticable pressure drop. If you need very small leak through these valves, you will need mention, specially, tight-shut-off valves and class..., depending on the leak you expect.
So, it is best to keep these two valves and do the test, so you are sure whole segment is subjected to test pressure.