Home › Forums › Coking › Technical › Fractionation & Process › Process › Blowdown This topic contains 0 replies, has 1 voice, and was last updated by Freddy Martinez 11 years, 4 months ago. Author Posts July 23, 2009 at 6:43 am #3047 Freddy MartinezParticipant Are there a DCU with blowdown operation at high pressure (greater than 30 psig)? In this case, how they despresurrize the coke drum at the end of the cooling phase?. Also what is the coke drum pressure when it’s opened? Author Posts You must be logged in to reply to this topic.