IEC 61511-1 PDF

INTERNATIONAL. STANDARD. IEC. First edition. Functional safety –. Safety instrumented systems for the process industry sector –. Part 1. IEC FUNCTIONAL SAFETY – SAFETY INSTRUMENTED SYSTEMS FOR THE PROCESS INDUSTRY SECTOR – Part 1: Framework, definitions. BS IEC This British Standard was published under the authority of the Standards Policy and. Strategy Committee on. 12 March.

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IEC standard is a technical standard which sets out practices in the engineering of systems that ensure the safety of an industrial process through the use of instrumentation.

Such systems are referred to as Safety Instrumented Systems.

The title of the standard is ” Functional safety – Safety instrumented systems for the process industry sector “. The process industry sector includes many types of manufacturing processes, such as refineries, petrochemical, chemical, pharmaceutical, pulp and paper, and power. The process sector standard does not cover nuclear power facilities or nuclear reactors. IEC covers the application of irc, electronic and programmable electronic equipment.

While IEC does apply to equipment using pneumatic or hydraulic systems to manipulate final elements, the standard does not cover the design and implementation of pneumatic or hydraulic logic solvers. This standard defines the functional safety requirements established by IEC in process industry sector terminology. This document sets the standards for safety-related system design of hardware and software. IEC is generic functional safety standard, providing the framework and isc requirements for sector specific standard.


IEC provides good engineering practices for the application of safety instrumented systems in the process sector. It primarily mirrors IEC in content with the exception that it contains a grandfathering clause:.

For existing safety instrumented systems SIS designed and constructed in accordance with codes, standards, or practices prior to the issuance of this standard e. This means that in each of the member states of the European Union, the standard is published as a national standard.

IEC – Wikipedia

The content of these national publications is identical to that of IEC Note, however, that is not harmonized under any directive of the European Commission. IEC covers the design and management requirements for SISs throughout the entire safety life cycle. It starts in the earliest phase of a project and continues through startup.

It contains sections that cover modifications that come along later, along with maintenance activities and the eventual decommissioning activities. An SIS is composed of a separate and independent combination of sensors, logic solvers, final elements, and support systems that are designed and managed to achieve a specified safety integrity level SIL.

An SIS may implement one or more safety instrumented functions SIFswhich are designed and implemented to address a specific process hazard or hazardous event. The essential roles of the various 615111 assigned responsibility for the SIS should be defined and procedures developed, as necessary, to support the consistent execution of their responsibilities.


A hazard and risk analysis is used to identify the required safety functions and risk reduction for specified hazardous events. Safety functions allocated to the SIS are safety instrumented functions; the allocated risk reduction is related to the SIL.

Field data are ied through operational and mechanical integrity program activities to assess actual SIS performance.

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When the required performance is not met, action should 6151-1 taken to close the gap, ensuring safe and reliable operation. From Wikipedia, the free encyclopedia. This article relies largely or entirely on a single source.

Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources. List of International Electrotechnical Commission standards. Retrieved from ” https: Electrical standards Safety Industrial processes. Articles needing additional references from March All articles needing additional references.

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