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  1. Shahin2020

    Reverse Flow HAZOP item

    I attached the Schematic Hi @LittleInch Thank you for this guidance, this is exactly what I found in API 521 section 4.4.9.3.3 indicating all possible cases (as assumption) for a Reverse Flow Through Failed Check Valve: 1- The Failed Check Valve has No Flow Resistance in the Rev Flow...
  2. Shahin2020

    Reverse Flow HAZOP item

    Hi all, There is a HAZOP item to protect U/S equipment from a reverse flow coming from a high-pressure header. There is a PSV D/S of equipment. There are two dissimilar check valves to prevent the reverse flow. In case of double jeopardy, when one of the check valves failed open, and the...

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