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We are looking at installing the bird cage design system on our coke drums and have a few questions to those who have experience with it.
Have you had a through wall crack during charge and what was the result?. We are concerned with having an air gap between the insulation panels and the drum shell.
If your drums have significant bulges, are there issues with the insulation panels rubbing/wearing? -
29-jan-2011 Thanks for posted questions on bird cage inisulation. We are in the process of advancing a project with bird cage design and removable panels. Your concern on build up of hydrocarbon in the air gap between the coke drums and panels due to a leak is something we have not considered. The insulation panel system is not air tight, so gas will dissipate. However, it ultimately comes down to (A) the size of the leak and (B) the rate gas can escape. If A is greater than B, it will accumulate in the air gap, possibly creating an LEL risk. Mitigations that come to my mind are to provide a way (I have no exact idea at this point) for leaks to pass through the insulation system (tell tale vents), eliminating the risk; have a rigorous inspection program for the circ welds that allows cracks to be found and monitored (expensive solution). We are going to do further analysis of this risk and get back to the forum.
1-feb-2011 We have determined that the installation of “chimney stop” baffles (every 8 – 12 ft in elevation) within the bird cage will prevent the accumulation of hydrocarbon gas within the air gap volume. Leaks will then be detectable through seams in the insulation system. Ignition of leaks, and damage to the insulation, is always a possibility with all insulation systems, but we view this as a low, manageable risk. Prevention of large coke drum cracks and leaks requires an effective inspection/maintenance/repair strategy. Every owner/operator will need to make their own risk-based analysis of the scenario. Best regards – Mitch
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AnonymousPLEASE BE SUBMITTED US WITH TECHNICAL SPECFICATIONS ABOUT THERMAL INSULATION ( MATERIAL AND GELVANIZED STEEL + ACCESSORIES) FOR COKER DRUM HAS THE FOLLOWING DATA:
MAXIMUM TEMPERATURE: 500 C
DIAMETER: 6.1 METER
LENGTH: 30 METER
BEST REGARS
ENG. NASR
SUIZ OIL PROCESSING COMPANY – EGYPT
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