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  • Users: srhash
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  1. srhash

    Single Acting Actuated Valve Fail Hold Position

    For a single-acting actuator pneumatic valve, how does fail hold work? For a fail safe condition (FSC or FSO) the air is released to ensure that the valve moves to the fail safe condition. Similar action happens indirectly via SOV/ Positioner ports in case of electric failure. As i...
  2. srhash

    Using FCI-70-2 or API-598

    I am working at a petrochemical complex. We have a lot of control valves that need to be tested during Shutdown for leak tests. I am a little confused as to which standard should be used for valve seat leakage tests and hydrotests (shell test). As i understand, FCI-70-2 is specifically...

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