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Coke Drum PSV's

Home Forums Coking Technical Fractionation & Process Process Coke Drum PSV's

This topic contains 7 replies, has 3 voices, and was last updated by  daniel samuel 11 years, 6 months ago.

  • Author
  • #3298


    Why do we require MOV’s at the PSV outlet lines, and also what is the procedure that is generally followed for performing the hydraulics checking of the Coke drum PSV’s outlet lines.

  • #5897

    daniel samuel

    never heard a mov on the downstream of drum psv (any psv)

  • #5888


    To avoid potential high H2S content backflow from Blowdown Header, since PSVs are not considered TSO valves. PSV MOVs must be closed before top unheading; the interlock is with Vent valves, so it can be closed only when Vent valves are open, and vent valves can not be closed unless PSV MOVs are open.

  • #5616


    What is the typiocal valve type for this service? Any particular design features?

  • #5611


    below , but the material has to be inconel for the below

  • #5066

    David Maia

    Generally there is a steam injection before and after the PSV, for line cleaning. The probability of the backflow from blowdown reach the drum is very low. Is the MOV really necessary ?

  • #5065


    Sir, you’re right, however the low probability of ocurrence does not eliminate the hazard while the close MOV will.

  • #5064


    Also these valve can are included in the drum vent interlock (limit switch);for safety operationally these valves are been open and close with every operation of decoked


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