A strategy for the risk-based inspection of pressure safety valves

作者：Chien, Chi Hui^*; Chen, Chun Hung; Chao, Yuh J

来源：Reliability Engineering & System Safety, 2009, 94(4): 810-818.

DOI：10.1016/j.ress.2008.09.002

• Pressure safety valve
• Aging
• Aging trend
• Analysis of variance
• Semi-quantitative risk-based inspection

The purpose of a pressure safety valve (PSV) is to protect the life and safety of pressure vessels in a pressurized system. If a weakened PSV fails to function properly, a catastrophic event might occur if no other protective means are provided. By utilizing the as-received test data and statistical analysis of the aging conditions of PSVs in lubricant process units, a risk-based inspection (RBI) system was developed in this study. First of all, the characteristics of PSV were discussed from the practical viewpoint of engineering inspection and maintenance. The as-received test data, which shows obvious PSV damage, will be separated from the data used in the following statistical analysis. Then, the relationship between the aging conditions and the corresponding PSV parameters was analyzed by using the statistical technique-analysis of variance (ANOVA). Finally, a strategy for semi-quantitative RBI is proposed. Also. a definitive estimated inspection interval for every PSV is suggested. The outcome indicated most of the risks result from a few PSVs, for which the corresponding inspection intervals will be shorter than the 2 years in accordance with relative standards and local government regulations.

• 出版日期2009-4
• 单位中山大学