Transcription of API Standard 521 - Guide for Pressure-Relieving …
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API Standard 521 - Guide for Pressure-Relieving …
StandaEditionSectionInquiry #QuestionReply521 4th - March : The paragraph Check valve Malfunction says "..In these cases, one should consider providing a secondary device to minimize the potential for reversal of flow..". Should I understand the meaning "minimize" as "avoid" ?Experience has shown that a single check valve is not an effective means for preventing overpressure by reverse flow from a high- pressure source. Experience has also shown that when properly inspected and maintained series check valves are sufficient to eliminate significant reverse flow. However, some check valve seat leakage may still occur.
Sta nda Edition Section Inquiry # Question Reply API Standard 521 - Guide for Pressure-Relieving and Depressuring Systems Last update: October 23, 2012
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