Abstract
As a pressure relief device of pressure-bearing equipment, pressure relief valve (PRV) should be inspected once a year according to the regulations, which increasingly contradicts the long-term operation of petrochemical units. In recent years, risk-based inspection (RBI) has been widely used in inspection and maintenance of petrochemical equipment. According to the RBI results and Inspection records of PRVs in various refining enterprises, the problems encountered during the prolonging the inspection cycle of PRV are summarized, which provide reasonable basis for prolonging the inspection cycle of PRV. RBI technology is applied to 5810 PRVs in an enterprise, so that nearly 80% of the PRVs achieve the purpose of delayed inspection.In addition, suggestions for improvement meatures are provided for common problems encountered during the use and inspection of PRVs.
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