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Inlet line plugging

This topic contains 5 replies, has 4 voices, and was last updated by  Claus Graf 10 years, 1 month ago.

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  • #3925

    Anonymous

    We are having problems with our inlet line to the Coke drum plugging. Does anyone else have this problem? How do you prevent this? How much steam do you add and for how long? We steam from the Switch valve to the drum and from the drain line into the drum.

    Thanks

  • #7244

    Claus Graf
    Participant

    Do you start your steam flow prior to switching ?
     
    Regards
    CG

  • #7235

    Anonymous

    It is started immediately after switching.

  • #7232

    The best practice indicate that the steam must be injected between 10 to 20 minutes before you switching the drum, of way to avoid losing the flow inside of the line & coke drum.  In other words is not recommendable to take off  a fluid without having already other fluid entering into the line or drum (the same it applies for the change the steam to cooling water).  This injection can be done through the purge line located down stream of the SP-6 (3″) until that steam going by the steam control valve (utility header),  then this purge is closed and the steam flow going to the normal way (is generally around 10000 lb/hr ;going to the fractionator), if you do not have this purge line you can do it  through  the steam control valve (utility header)
     
    Im sorry for my english, best Regards

  • #7231

    Claus Graf
    Participant

    Steam must be flowing before the switch.

    Regards, CG

  • #5094

    marrylee marrylee
    Participant

    70 per day….

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