Transcription of Seat Tightness of Pressure Relief Valves - API Ballots
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Seat Tightness of Pressure Relief Valves - API Ballots
Seat Tightness of Pressure Relief Valves API STANDARD 527 THIRD EDITION, JULY 1991 FOURTH EDITION BALLOTDRAFT REAFFIRMED, MARCH 2002 REAFFIRMED, JULY 2007 1 1 Scope This standard describes methods of determining the seat Tightness of metal- and soft-seated Pressure Relief Valves , including those of conventional, bellows, and pilot-operated designs. The maximum acceptable leakage rates are defined for Pressure Relief Valves with set pressures from (103 kPa gauge) 15 psig to 41,379 kPa gauge (6,000 psig). If greater seat Tightness is required, the purchaser shall specify it in the purchase order. The test medium for determining the seat Tightness air, steam, or water shall be the same as that used for determining the set Pressure of the valve. For dual-service Valves , the test medium air, steam, or water shall be the same as the primary relieving medium.
Seat Tightness of Pressure Relief Valves API STANDARD 527 THIRD EDITION, JULY 1991FOURTH EDITION “BALLOTDRAFT” REAFFIRMED, …
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