SRS-Safety Requirement Specification

The IEC 61511 Standard requires the user to create a Safety Requirements Specification (SRS) for a Safety Instrumented System (SIS) that incorporates all the analysis done during the Risk Assessment, HAZOP/PHA and LOPA reviews. The SRS falls into two types: an initial conceptual SRS, often referred to as the Process Safety SRS; a detailed Design SRS which contains all the detailed design information. SRS Contains following Information as a minimum: 1. Functional Description of the Safety Function 2. Safety Integrity Level 3. Required Risk Reduction Factor 4. Energize to Trip or De-energize to Trip 5. Low Demand, High Demand, Continuous Demand 6. Safe State for each safety function 7. Start up, Restart and Reset Functionality 8. Maximum allowable Spurious Trip Level 9. Bypass Philosophy 10. Environmental condition SRS is first prepared by the End User. System Integrators uses this information to prepare their own version of SRS containing Hardware and Software Requirements. This version of SRS have to approved by End users. After Final SRS, design and engineering can be started.

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