1、 AMERICAN NATIONAL STANDARD ANSI/ISA-84.00.01-2004 Part 1 (IEC 61511-1 Mod) Functional Safety: Safety Instrumented Systems for the Process Industry Sector Part 1: Framework, Definitions, System, Hardware and Software Requirements Approved 2 September 2004 ANSI/ISA-84.00.01-2004 Part 1 (IEC 61511-1:
2、Mod) Functional Safety: Safety Instrumented Systems for the Process Industry Sector Part 1: Framework, Definitions, System, Hardware and Software Requirements ISBN: 978-1-55617-919-8 Copyright 2004 by IEC and ISA. All rights reserved. Not for resale. Printed in the United States of America. Nopart o
3、f this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise), without the prior written permission of the Publisher). ISA 67 Alexander Drive P.O. Box 12277 Research Triangle Park, North
4、Carolina 27709 USAANSI/ISA-84.00.01-2004 Part 1 (IEC 61511-1 Mod) 3 Copyright 2004 ISA. All rights reserved. Preface This preface, as well as all footnotes, is included for information purposes and is not part of ANSI/ISA-84.00.01-2004 Part 1 (IEC 61511-1 Mod). This document has been prepared as par
5、t of the service of ISA the Instrumentation, Systems, and Automation Society toward a goal of uniformity in the field of instrumentation. To be of real value, this document should not be static but should be subject to periodic review. Toward this end, the Society welcomes all comments and criticism
6、s and asks that they be addressed to the Secretary, Standards and Practices Board; ISA; 67 Alexander Drive; P. O. Box 12277; Research Triangle Park, NC 27709; Telephone (919) 549-8411; Fax (919) 549-8288; E-mail: standardsisa.org. The ISA Standards and Practices Department is aware of the growing ne
7、ed for attention to the metric system of units in general, and the International System of Units (SI) in particular, in the preparation of instrumentation standards. The Department is further aware of the benefits to USA users of ISA standards of incorporating suitable references to the SI (and the
8、metric system) in their business and professional dealings with other countries. Toward this end, this Department will endeavor to introduce SI-acceptable metric units in all new and revised standards, recommended practices, and technical reports to the greatest extent possible. Standard for Use of
9、the International System of Units (SI): The Modern Metric System, published by the American Society for Testing any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the I
10、EC also participate in this preparation. The IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of the IEC on technical matters express, as n
11、early as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested National Committees. 3) The documents produced have the form of recommendations for international use and are published in the form of standards, te
12、chnical specifications, technical reports or guides and they are accepted by the National Committees in that sense. 4) In order to promote international unification, IEC National Committees undertake to apply IEC International Standards transparently to the maximum extent possible in their national
13、and regional standards. Any divergence between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter. 5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in confo
14、rmity with one of its standards. 6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61511-1 has been pre
15、pared by subcommittee 65A: System aspects, of IEC technical committee 65: Industrial-process measurement and control. The text of this standard is based on the following documents: FDIS Report on voting 65A/368/FDIS 65A/372/RVD Full information on the voting for the approval of this standard can be
16、found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 12 ANSI/ISA-84.00.01-2004 Part 1 (IEC 61511-1 Mod) Copyright 2004 ISA. All rights reserved. IEC 61511 ANSI/ISA-84.00.01-2004 (IEC 61511 Mod) consists of th
17、e following parts, under the general title Functional safety: Safety instrumented systems for the process industry sector (see Figure 1): Part 1: Framework, definitions, system, hardware and software requirements Part 2: Guidelines in the application of IEC 61511-1 ANSI/ISA-84.00.01-2004 Part 1 (IEC
18、 61511-1 Mod) . Part 3: Guidance for the determination of the required safety integrity levels The committee has decided that the contents of this publication will remain unchanged until 2007. At that date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. A
19、bilingual version of this standard may be issued at a later date. ANSI/ISA-84.00.01-2004 Part 1 (IEC 61511-1 Mod) 13 Copyright 2004 ISA. All rights reserved. INTRODUCTION Safety instrumented systems have been used for many years to perform safety instrumented functions in the process industries. If
20、instrumentation is to be effectively used for safety instrumented functions, it is essential that this instrumentation achieves certain minimum standards and performance levels. This international standard addresses the application of safety instrumented systems for the Process Industries. It also r
21、equires a process hazard and risk assessment to be carried out to enable the specification for safety instrumented systems to be derived. Other safety systems are only considered so that their contribution can be taken into account when considering the performance requirements for the safety instrum
22、ented systems. The safety instrumented system includes all components and subsystems necessary to carry out the safety instrumented function from sensor(s) to final element(s). This international standard has two concepts which are fundamental to its application; safety lifecycle and safety integrit
23、y levels. This standard addresses safety instrumented systems which are based on the use of electrical/electronic/programmable electronic technology. Where other technologies are used for logic solvers, the basic principles of this standard should be applied. This standard also addresses the safety
24、instrumented system sensors and final elements regardless of the technology used. This International Standard is process industry specific within the framework of IEC 61508 (see Annex A). This International Standard sets out an approach for safety life-cycle activities to achieve these minimum stand
25、ards. This approach has been adopted in order that a rational and consistent technical policy is used. In most situations, safety is best achieved by an inherently safe process design If necessary, this may be combined with a protective system or systems to address any residual identified risk. Prot
26、ective systems can rely on different technologies (chemical, mechanical, hydraulic, pneumatic, electrical, electronic, programmable electronic) To facilitate this approach, this standard requires that a hazard and risk assessment is carried out to identify the overall safety requirements; requires t
27、hat an allocation of the safety requirements to the safety instrumented system(s) is carried out; works within a framework which is applicable to all instrumented methods of achieving functional safety; details the use of certain activities, such as safety management, which may be applicable to all
28、methods of achieving functional safety. This International Standard on safety instrumented systems for the process industry addresses all safety life-cycle phases from initial concept, design, implementation, operation and maintenance through to decommissioning; enables existing or new country speci
29、fic process industry standards to be harmonized with this standard. 14 ANSI/ISA-84.00.01-2004 Part 1 (IEC 61511-1 Mod) Copyright 2004 ISA. All rights reserved. This International Standard is intended to lead to a high level of consistency (for example, of underlying principles, terminology, informat
30、ion) within the process industries. This should have both safety and economic benefits. In jurisdictions where the governing authorities (for example, national, federal, state, province, county, city) have established process safety design, process safety management, or other requirements, these tak
31、e precedence over the requirements defined in this standard. ANSI/ISA-84.00.01-2004 Part 1 (IEC 61511-1 Mod) 15 Copyright 2004 ISA. All rights reserved. Clauses 9 and 10Design phase forsafetyinstrumentedsystemsClause 11Design phase forsafetyinstrumentedsystem softwareClause 12Allocation of the safet
32、y requirements tothe safety instrumented functions anddevelopment of safety requirementsspecificationDevelopment of the overall safetyrequirements (concept, scope definition,hazard and risk assessment)Clause 8Factory acceptance testing,installation and commissioning andsafety validation of safetyins
33、trumented systemsClauses 13, 14, and 15Operation and maintenance,modification and retrofit,decommissioning or disposal ofsafety instrumented systemsClauses 16, 17, and 18SupportpartsTechnicalrequirementsPART 1PART 1PART 1PART 1PART 1ReferencesClause 2PART 1Definitions andabbreviationsClause 3PART 1C
34、onformanceClause 4PART 1Management offunctional safetyClause 5PART 1InformationrequirementsClause 19PART 1DifferencesAnnex “A”PART 1Guideline for theapplication of part 1PART 2Guidance for thedetermination of therequired safetyintegrity levelsPART 3Safety life-cyclerequirementsClause 6PART 1Verifica
35、tionClause 7PART 1Figure 1 Overall framework of this standard IEC 3240/02 This page intentionally left blank.ANSI/ISA-84.00.01-2004 Part 1 (IEC 61511-1 Mod) 17 Copyright 2004 ISA. All rights reserved. FUNCTIONAL SAFETY SAFETY INSTRUMENTED SYSTEMS FOR THE PROCESS INDUSTRY SECTOR Part 1: Framework, de
36、finitions, system, hardware and software requirements 1 Scope This International Standard gives requirements for the specification, design, installation, operation and maintenance of a safety instrumented system, so that it can be confidently entrusted to place and/or maintain the process in a safe
37、state. This standard has been developed as a process sector implementation of IEC 61508. In particular, this standard a) specifies the requirements for achieving functional safety but does not specify who is responsible for implementing the requirements (for example, designers, suppliers, owner/oper
38、ating company, contractor); this responsibility will be assigned to different parties according to safety planning and national regulations; b) applies when equipment that meets the requirements of IEC 61508, or of 11.5 of IEC 61511-1 ANSI/ISA-84.00.01-2004 Part 1 (IEC 61511-1 Mod), is integrated in
39、to an overall system that is to be used for a process sector application but does not apply to manufacturers wishing to claim that devices are suitable for use in safety instrumented systems for the process sector (see IEC 61508-2 and IEC 61508-3); c) defines the relationship between IEC 61511 ANSI/
40、ISA-84.00.01-2004 (IEC 61511Mod), and IEC 61508 (Figures 2 and 3); d) applies when application software is developed for systems having limited variability or fixed programmes but does not apply to manufacturers, safety instrumented systems designers, integrators and users that develop embedded soft
41、ware (system software) or use full variability languages (see IEC 61508-3); e) applies to a wide variety of industries within the process sector including chemicals, oil refining, oil and gas production, pulp and paper, non-nuclear power generation; NOTE Within the process sector some applications,
42、(for example, off-shore), may have additional requirements that have to be satisfied. f) outlines the relationship between safety instrumented functions and other functions (Figure 4); g) results in the identification of the functional requirements and safety integrity requirements for the safety in
43、strumented function(s) taking into account the risk reduction achieved by other means; h) specifies requirements for system architecture and hardware configuration, application software, and system integration; i) specifies requirements for application software for users and integrators of safety in
44、strumented systems (clause 12). In particular, requirements for the following are specified: safety life-cycle phases and activities that are to be applied during the design and development of the application software (the software safety life-cycle model). These 18 ANSI/ISA-84.00.01-2004 Part 1 (IE
45、C 61511-1 Mod) Copyright 2004 ISA. All rights reserved. requirements include the application of measures and techniques, which are intended to avoid faults in the software and to control failures which may occur; information relating to the software safety validation to be passed to the organization
46、 carrying out the SIS integration; preparation of information and procedures concerning software needed by the user for the operation and maintenance of the SIS; procedures and specifications to be met by the organization carrying out modifications to safety software; j) applies when functional safe
47、ty is achieved using one or more safety instrumented functions for the protection of personnel, protection of the general public or protection of the environment; k) may be applied in non-safety applications such as asset protection; l) defines requirements for implementing safety instrumented funct
48、ions as a part of the overall arrangements for achieving functional safety; m) uses a safety life cycle (Figure 8) and defines a list of activities which are necessary to determine the functional requirements and the safety integrity requirements for the safety instrumented systems; n) requires that
49、 a hazard and risk assessment is to be carried out to define the safety functional requirements and safety integrity levels of each safety instrumented function; NOTE See Figure 9 for an overview of risk reduction methods. o) establishes numerical targets for average probability of failure on demand and frequency of dangerous failures per hour for the safety integrity levels; p) specifies minimum requirements for hardware fault tolerance; q) specifies techniques/measures required for achieving the specified integrity levels; r) defines a maxi
