THE QUANTITATIVE RISK EVALUATION FOR IN-SERVICE PRESSURE RELIEF VALVE
Pressure relief valve (PRV) is the safety device of pressure vessel system, which is the effective tool to avoid over-pressure accident. In this paper, some main factors, which influence on the reliability of PRV, such as set pressure and service status and service fouling potential and orfice area and MSWP and bench test history and chatter history and so on, were considered. First, the probability of the relief system failing to open on demand was calculated by a Weibull distribution against time t, which includes the relief valve either fails to open or opens above the set pressure. Second, likelihood of equipment failure caused by relief system failure was calculated by the likelihood per year of equipment failing. Finally, consequence for equipment failure caused by the relief system failing to open was calculated by the different damage mechanisms such as thinning and SCC and fatigue. According to above model, the risk of in-service PRV can be determined quantitatively by risk matrix suggested by API581.
Jianping Zhao
Nanjing University of Technology, No.5 XinMoFan Road, Nanjing, 210009.
国际会议
第九届工程结构完整性国际会议(The Ninth International Conference on Engineering Structural Integrity Assessment)
北京
英文
2007-10-15（万方平台首次上网日期，不代表论文的发表时间）