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Drainage before coke drum steaming

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This topic contains 0 replies, has 1 voice, and was last updated by  4 drums coker 14 years, 3 months ago.

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    4 drums coker
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    How to know if drainage is enough or not before coke drum steaming?
     
    Originally we set the drainage time to be 5 min.
     
    We shorten the drainage time to 2 min. after years of  experience.
     
    But we do not know if it is all right or not.
     
    Recently we encounter a VR carry over from coke drum, we believe that the root cause is water carried by the steam.
     
    We want to know the typical drainage time in other refinery.
     

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