PSV test fluids.......
PSV test fluids.......
(OP)
Can anyone please advise how to determine what test fluid should be used to test the set pressure on a PSV. Any help or reference to standards would be appreciated.
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RE: PSV test fluids.......
requires New Gas or Vapor Service valves to be tested on Air, Liquid Service Valves to be tested on Water and Steam Service to be tested on Steam, unless the Steam Valve is too large or too high Set Pressure. Then they may be tested with Air provided a compensation factor is applied.
NBIC, Para. RE-2010 requires the same as ASME Sec. VIII, Div. 1, for repaired Valves, with the exception of Steam service valves tested on Air. Only owner/users are granted permission to use steam to air correlation factors under the National Board "VR" Program.
J. Alton Cox
www.delucatest.com
RE: PSV test fluids.......
In some cases, the capacity may indicate a fluid other than the actual service. If this is the case you should verify that the PSV is suitable for the application and then test it according to the actual service condition, steam, air or liquid. If the PSV is not suitable for the application, it should be replaced or converted to the correct trim prior to testing. Air service valves in Lquid service may not attain full lift at 10% overpressure and therefore may not provide the required overpressure protection. Liquid PSVs in Air or Steam service may not have the proper internals to attain full lift on compressible fluids.
J. Alton Cox
www.delucatest.com
RE: PSV test fluids.......
David
RE: PSV test fluids.......
J. Alton Cox
www.delucatest.com