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During a recent turnaround, it was found that the vacuum unit heater tubes are badly coked (1/2" to 1"thick coke layer as per the inspection Engr). Due to shortage of time we could only manage steam spalling. The heater tubes are plug head tubes ( we do not have any drawing of the plug head tubes).
Can we do Pig Cleaning of the tube? Wil the plug make any hinderance to the movement of the pig?
 
Answers
11/10/2012 A: Virendra Kapoor, Petroleum Refining Consultants, vkkapoor9@yahoo.com
Steam Spalling may not as efficient as other better methods available depending on availability of time.
10/10/2012 A: keith bowers, B and B Consulting, kebowers47@gmail.com
Pig cleaning may work. Why not go back to manufacturer for assistance?