What is it about?
This document explains how to prove the integrity of a safety function when a full end to end proof test is not practical
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Why is it important?
In some legacy plants that were constructed before the concept of proof testing was mainstream, parts of the safety system may not be accessible for testing, but confidence that the Safety Function is operational is still required
Perspectives
This paper shows that testing safety instrumented functions is not an exact science and taking cognisance of other related tasks and parameters can support the overall assessment
John Rielly
Institute of Measurement and Control
Read the Original
This page is a summary of: Assuring the Probability of Failure on Demand of a Safety Instrumented System without Full Proof Testing, Measurement and Control, September 2016, SAGE Publications,
DOI: 10.1177/0020294016663975.
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