API Standard 521 - Guide for Pressure-Relieving and Depressuring Systems.pdf

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Sta nda Edition Section Inquiry # Question Reply 521 4th - March 1997 2.3.4 521-I-07/03 Background: The paragraph 2.3.4 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 h
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