Proof Test Coverage: Understanding PTC Factors Through FMEA

Join Pieter Poldervaart for the fourth edition of the SIS Mastery Series, where we take a deeper look at one of the most important aspects of Safety Instrumented System (SIS) lifecycle management: Proof Test Coverage.

Periodic proof testing is a critical activity at production sites, helping verify that SIS equipment can perform its intended safety function when needed. But the effectiveness of a proof test depends on more than simply performing it. The Proof Test Coverage (PTC) of your procedures directly influences the Probability of Failure on Demand (PFD) calculations used to determine appropriate proof test intervals.

In this session, we’ll explore how PTC factors affect PFD calculations, how these factors can be determined, and how you can verify that the coverage achieved by your actual Proof Test Procedures aligns with the assumptions used in your SIF calculations.