Home › Forums › Coking › Operations › Cutting, Drilling, Unheading › Drilling › Drilling Water & Cooling › Drainage before coke drum steaming This topic contains 0 replies, has 1 voice, and was last updated by 4 drums coker 15 years, 7 months ago. Author Posts November 20, 2006 at 9:14 am #4107 4 drums cokerParticipant 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. Author Posts You must be logged in to reply to this topic.