Partial stroke testing of process shutdown valves: How to determine the test coverage |
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| Authors: | Mary Ann Lundteigen Marvin Rausand |
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| Institution: | aDepartment of Production and Quality Engineering, Norwegian University of Science and Technology, S.P. Andersens v. 5, NO 7491 Trondheim, Norway |
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| Abstract: | Partial stroke testing (PST) has recently been introduced as a semi-automatic means to test process shutdown valves. Normally, this type of testing does not disturb the process and can detect many of the failures that traditionally have been revealed only by functional testing. The fraction of all dangerous failures that are detected by PST is called the PST coverage and is decisive for the effectiveness of the PST. So far, limited guidance on how to determine the PST coverage has been given. This paper discusses the application and limitations of PST and suggests a new procedure for how to determine the PST coverage factor. |
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| Keywords: | Partial stroke testing Safety instrumented system PST coverage Functional testing High integrity pressure protection system |
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