However, the explosion is initiated by the correct operation of the “furnace pressure high” trip. Note: In this example the dangerous condition arises from the low airflow and failure of the trips to detect this. It illustrates a number of methods available for ensuring that an appropriate SIL is selected for each SIF.Įrroneously detects gate in open positionįails to interpret high level or gate closed on demandįigure 8.19. The scope of the publication is relevant to SIFs operating in any of the following modes of operation: low demand, high demand or continuous. Whilst the main focus of the publication is safety and environmental risk, the guidance can also be applied to other risk drivers (e.g. Guidance on safety integrity level (SIL) determination considers the required performance of the safety instrumented function (SIFs) to be implemented by protection systems to prevent specific hazardous events or to mitigate the consequence of those hazardous events. SIL targeting is usually determined by adopting a risk-based approach either quantitatively, qualitatively or a mixture of both. The publication recognizes that there should be a balanced approach to risk management starting with adoption of inherently safer design principles, with elimination of hazards as the first priority. Practically, it builds on IEC 61511 by in-filling the requirements of the standard with user experience and worked examples. This document provides guidance on safety integrity level (SIL) determination in the context of IEC 61511 for the process industries, such as the energy industry and chemical manufacturing industry. DrDavid J Smith, Kenneth GL Simpson, in The Safety Critical Systems Handbook (Fourth Edition), 2016 8.6 Energy Institute: Guidance on Safety Integrity Level (SIL) Determination, Expected to be Published 2016
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