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).
2 2.2.3 Test Pressure For a valve whose set pressure is greater than 345 kPa gauge (50 psig), the leakage rate in bubbles per minute shall be determined with the test pressure at the valve inlet held at 90 % of the set pressure.
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