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. The user needs to determine if this leakage is significant to warrant additional protection measure such as isolation 4th - March relief valves sized in accordance with Table 2 need to be sized for full flow?Table 2 provides a general listing of possible overpressure scenarios and the basis for determining relief loads.
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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