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  1. srhash

    Single Acting Actuated Valve Fail Hold Position

    @LittleInch & gerhardl>> Thanks for the feedback. However, i am still a little confused. Let me extract one case example and post here and then take up the discussion for further understanding.
  2. 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...
  3. srhash

    Using FCI-70-2 or API-598

    @Muktiadi >>> Thanks for the info and detailed clarity.
  4. srhash

    Using FCI-70-2 or API-598

    Hi Muktiadi, The question is not specific to a particular valve but to many such valves. These valves remain in open position (100%) and function as EIV when the upstream supply is cut or some abnormality downstream of the valves (fail safe close). In one such case this is a 8", 900# RF...
  5. srhash

    Using FCI-70-2 or API-598

    @muktiadi and @19081984 >>> Thanks for the feedback. Would welcome more view points on the discussion from other members. Also, i need an answer to the question as in my original post; that if i have a Class-V valve (defined as control valve in datasheet) but only performing the funtion of a...
  6. 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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