SRS - Safety Requirements Specification

The safety requirement specification (SRS) is a documentation requirement of IEC 61511 and ANSI/ISA S84.01-2003 and is an integral part of the Safety Lifecycle model.

The SRS is a summary of key decisions that must be made prior to the conceptual design. The purpose of the SRS is to define the envelope of the Safety Instrumented System (SIS) design. This document, or collection of documents, should be viewed as a basis of design. It is a crucial review step that will minimize downstream detail design changes that could impact cost and/or schedule.

The SRS consists of both safety functional requirements and safety integrity requirements.

PCS expertise can prove invaluable in this critical stage of the safety lifecycle.