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[MW:28627] Re: Valve in hydrotest, is is allowed?

By Materials & Welding
Have just been doing research on this for a current project. Under ANSI/FCI 70-3-2004 the classes are listed to VII. It also shows the allowable leakage for the different size valves. Am currently having a disagreement with the client and engineer about a hydro test that dropped 9 PSI over a 4 hour period. The system dead ended at three valves (1-8" gate valve & 2-12" gate valves). There was no pressure on the back side of these valves and they are not accepting the test.

HELP !!!!!!!

Wayne

On Wednesday, October 21, 2009 at 8:59:27 PM UTC-5, Shashank Vagal wrote:
Hi,
Is it advisable to pressure test a water line for up to 10 bars with a valve already installed. (the valve will not be spaded during the test, it will only be in closed position)
 
Regards,
Shashank Vagal


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