01306nab a2200181 4500 20260520003916.0 260224s2009 xxu Analysis of pressure relief valve proof test data mar. 2009 2009-03-31 ; 2009-03-31 6 p. ; 24-29 This article reports on our statistical analysis of pressure relief valve (PRV) proof test data for the failure mode, fail-to-open, i.e., the PRV remains closed when actual pressure reaches or exceeds 150% of set pressure. Three data sets, from two Fortune 500 operating companies, which met the intent of the quality assurance of proof test data as documented by the Center for Chemical Process Safety Process Equipment Reliability Database (CCPS PERD)[Note 1] initiative, were analyzed. Although the original intent of our analysis focused solely on estimating the failure rate during the useful life[Note 2] of the equipment, it became apparent that the probability of failure on initial installation or reinstallation after proof test, and the need to address what constituted end of useful life were very significant. 1 Process safety progress 28 ARTICULO Bukowski, Julia V. 40682 169392 169392 0 0 0 0 237211 BAAB BAAB 2026-03-05 200044193 0 200044193 2026-03-05 15:11:35 2026-03-05 ARTICULO