Major accident and failure of stationary equipment in the RFCCU.

The article presents several case studies related to accidents and failures of stationary equipment in the residue fluidized catalytic cracking units (RFCCUs). Topics discussed include failure of a catalyst cooler tube and aeration pipe due to poor insertion of inner tube to outer tube and bad welding quality, leakage of a slide valve packing due to improper countermeasures when valve stem was stuck and Leakage of carbon monoxide boiler tube due to urea solution penetration into insulation.