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[ pdf ] How to Determine the Safety Integrity Level (SIL) of a Safety System

How to Determine the Safety Integrity Level (SIL) of a Safety System Download
Topic under  SIL ( Safety Integrity Level )
Source: www.jlab.org 
File size: 2.67 MB
File type: pdf
Last download on: Wed Nov 14, 2018 11:13:00 AM
Short Desciption:
IEC 61508 – a Generic Standard The IEC 61508 standard was published in 1998 and falls under a global approach of safety which could be compared with the ISO9001 system for quality or with the ISO14000 system for the environment. The standard is generic in that it applies to the safety systems irrespective of their application. It provides a generically-based standard that can be used directly by industry but can also help with developing sector standards (e.g. machinery, process chemical plants, medical or rail) or product standards (e.g. gas detection).

SIL – a Unit for Functional Safety Functional safety is part of the overall safety that depends on a Safety Instrumented System (SIS), made up of equipment such as Fire & Gas Detection Systems that execute Safety Instrumented Functions (SIF). A safety function is designed to ensure or maintain a safety state of the SIS when a dangerous event occurs. Each safety function has a safety integrity level (SIL). The safety integrity level is the probability for the system to execute the safety functions required in all specified input conditions within a specified time interval. The 61508 standard details the requirements necessary to achieve each safety integrity level. Obtaining the Safety Integrity Level (SIL) is done by: • Guaranteeing the integrity of the cycle of development of the system in the fields of specification, design and testing, with the goal of avoiding and eliminating systematic failures. •Guaranteeing the robustness of the design by measurements allowing the systematic fault tolerances (diagnostics, access control, environment, etc.). • Respecting the constraints on the equipment architecture for the rate of diagnostic coverage to determine the Safe Failure Fraction (SFF). • By guaranteeing a probability of failures on demand (PFD), as a function of the failure rate and the test interval, or as failure rate per hour (PFH). • If software is included, by guaranteeing the integrity and robustness of the design concerning only systematic failures.
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