CORROSION PROBLEMS OF MODERN PETROLEUM REFINERY

摘要

The problem of local corrosion damage of oil refining units has recently become considerably aggravated that is connected both with increase in aggressiveness of oil being processed, and with long serviceable life of units (for the majority of refineries of Russia - more than 30 years). In all oil refining towers made with plating layers of 08X13 steel, while in service, to corrosion cracking fissuring of the welded seams, seam-side zones and metal of plating are subjected that is connected with the high propensity of the 08X13 steel to pitting corrosion. Occurrence of pittings leads to decrease in corrosion stability and mechanical properties of the equipment and frequently - to sudden destruction and emergencies. Propensity of ferrite, martensitic, austenitic-ferrite, austenitic and carbonaceous steels to pitting corrosion in operating duty of all types oil refining units' operation and in laboratory conditions by chemical and electrochemical methods - in water solutions of the electrolytes, modelling steaming condensates during preparation of the equipment to repairs is investigated. Inhibitors of general and pitting corrosion of the 08X13 steel for the equipment steaming process and the methodology of their pilot tests carrying out are proposed.