This document discusses functional safety assessments (FSAs), which are tools used to identify and correct defects in safety controls, alarms, and interlocks before incidents occur. It outlines the five stages of FSA according to international standards: 1) initial hazard and risk review, 2) detailed design review, 3) pre-commissioning review, 4) periodic operational reviews, and 5) proposed change reviews. The purpose and timing of each stage is explained to maximize the benefits of FSA while minimizing costs and schedule delays. A case study is also mentioned that shows how a lack of effective and timely FSA contributed to a costly catastrophic loss event.

Introduction To Functional Safety Assessments of Safety Controls, Alarms, and Interlocks: How Efficient Are Your Functional Safety Projects? PDF

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