Partial stroke testing reliability issues

摘要

WIB (a process automation user association) advises against using partial stroke testing (PST) technique for reduction of the probability of failure on demand (PFD) average. Leon Heemels and Henk Hinssen explain. WIB, an International non-profit association of end-users of control and automation equipment and systems in the process industry, has a significant membership base of end users in the process industry, including many petrochemical companies.