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.

Proof Test Coverage is a critical input to SIF PFD calculations, yet the assumed coverage factor does not always reflect what is actually achieved during a Proof Test Procedure. Understanding this gap can help you make better-informed decisions about proof test intervals, testing procedures, and SIS performance. This webinar will give you a clearer understanding of how PTC factors influence PFD calculations and practical insight into how they can be obtained and verified, helping you ensure that your proof testing strategy is based on realistic and defensible assumptions.

This webinar is designed for professionals involved in SIS engineering, functional safety, and the planning or execution of proof testing, including:

Date: Tuesday, October 27th 2026
Time: 16:30 CET