What is coke-drum unheading?

Answer 1

Coke drum unheading in general can be explained as follows.When coke is being formed in the coke drum the unheading is a means of isolating the drum from the decoking device.After coking process is complete the unheading devices ( at top and bottom of the drum ) are opened and by hydraulic or other means the coke formed is separated from the drum and further handled and conveyed.The drum is again ready for coking and the unheading devices are closed. The process of coking and decoking are batch processes and take place over a period of about 24+ hours in the ratio of about 20+ hours of coking and 2 or 3 hours of decoking.