Home › Forums › Coking › Drum Coker movement This topic contains 0 replies, has 1 voice, and was last updated by Freddy Martinez 8 years, 4 months ago. Author Posts February 28, 2013 at 8:17 pm #1728 Freddy MartinezParticipant It is normal that the drum moves sharply during different process sequences. By measuring with a sensor is marked between 4-5 degrees richter. Thanks. Author Posts You must be logged in to reply to this topic.