1、 AMERICAN NATIONAL STANDARD ANSI/ISA-84.91.01-2012 Identification and Mechanical Integrity of Safety Controls, Alarms, and Interlocks in the Process Industry Approved 20 September 2012 ANSI/ISA-84.91.01-2012 Identification and Mechanical Integrity of Safety Controls, Alarms, and Interlocks in the Pr
2、ocess Industry ISBN: 978-1-937560-64-5 Copyright 2012 by the International Society of Automation (ISA). All rights reserved. Not for resale. Printed in the United States of America. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any mean
3、s (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 Carolina 27709 - 3 - ANSI/ISA-84.91.01-2012 Preface This preface, as well as all footnotes and annexes, is incl
4、uded for information purposes and is not part of ANSI/ISA-84.91.01-2012. This document has been prepared as part of the service of the International Society of Automation (ISA) toward a goal of uniformity in the field of instrumentation. To be of real value, this document should not be static but sh
5、ould be subject to periodic review. Toward this end, the Society welcomes all comments and criticisms 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) 549-8
6、288; E-mail: standardsisa.org. The ISA Standards and Practices Department is aware of the growing need 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
7、 the benefits to USA users of ISA standards of incorporating suitable references to the SI (and the 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
8、, recommended practices, and technical reports to the greatest extent possible. Standard for Use of the International System of Units (SI): The Modern Metric System, published by the American Society for Testing neither should it be assumed that each type is necessarily separate and independent. NOT
9、E 2 Refer to ANSI/ISA-84.00.01-2004 (IEC 61511 Mod) for additional requirements related to safety instrumented systems. NOTE 3 Examples of non-instrumented safeguards include rupture disks, relief valves, dikes, etc. They do not fall within the scope of this standard. ANSI/ISA-84.91.01-2012 - 12 - F
10、igure 1 Safety controls, alarms, and interlocks relationship to the process hazards analysis (PHA) 4 Procedure 4.1 Identification 4.1.1 Safety controls, alarms, and interlocks shall be identified and documented in a manner that clearly distinguishes them from other instrumented systems. NOTE 1 Safet
11、y controls, alarms, and interlocks are typically identified during a process hazards analysis. NOTE 2 Other instrumented systems include many types of safeguards that are not identified as process safety safeguards or that are not required to provide risk reduction in the process hazards analysis fo
12、r process safety risks for example, basic process control, batch control, state control, asset/business protection, and quality control. 4.1.2 Safety controls, alarms, and interlocks shall be installed properly and consistent with the design specification and manufacturers instructions. 4.2 Maintena
13、nce and testing 4.2.1 Safety controls, alarms, and interlocks shall be included in a mechanical integrity program that uses periodic inspection/testing and preventive maintenance to maintain their integrity in the operating environment. 4.2.2 Safety controls, alarms, and interlocks shall be periodic
14、ally inspected, tested and maintained in accordance with procedures that take into account good engineering practices. - 13 - ANSI/ISA-84.91.01-2012 NOTE Good engineering practice includes consideration of many factors, such as manufacturer recommendations, other codes, standards and practices, inte
15、rnal practices, historical equipment performance, and prior operating experience. 4.2.3 Periodic inspections shall assure that the instruments associated with safety controls, alarms, and interlocks are installed properly and maintained in a manner consistent with the design specifications and good
16、engineering practices. 4.2.4 The frequency of mechanical integrity activities shall take into account good engineering practices. 4.2.5 The records of inspections and tests of the safety controls, alarms, and interlocks shall contain the following minimum documentation: a) Date of inspection or test
17、 b) Name of person who performed the inspection or test c) Serial number or other unique identifier of the equipment on which the inspection or test was performed d) Description of the inspection or test performed (for example, checklist, procedure, manufacturers recommendation) e) Results of the in
18、spection or test as compared to user-defined acceptance criteria (for example, as-found and as-left conditions, corrective actions taken) 5 Informative references and related documents 5.1 US Occupational Safety and Health Administration (OSHA), “Process Safety Management of Highly Hazardous Chemica
19、ls; Explosives and Blasting Agents,” 29 CFR Part 1910, Federal Register 57, 36, Washington, DC (1992). 5.2 US Environmental Protection Agency (EPA), “Accidental Release Prevention Requirements,” 40 CFR Part 68, Federal Register 61, 120, Washington, DC (1996). 5.3 Directive 96/82/EC of the European P
20、arliament and the Council of 9 December 1996 on the Control of Major Accident Hazards Involving Dangerous Substances and Directive 2003/105/EC of the European Parliament and the Council of 16 December 2003 Amending Council Directive 96/82/EC on the Control of Major Accident Hazards Involving Dangero
21、us Substances. 5.4 Control of Major Accident Hazards Regulations 1999, Statutory Instrument 1999/743 (as amended), Her Majestys Stationery Office, London 1999, ISBN 0 11 082192 0. 5.5 Guidelines for Safe and Reliable Instrumented Protective Systems, Center for Chemical Process Safety, May 2007, ISBN
22、 978-0-471-97940-1. This page intentionally left blank. Developing and promulgating sound consensus standards, recommended practices, and technical reports is one of ISAs primary goals. To achieve this goal the Standards and Practices Department relies on the technical expertise and efforts of volun
23、teer committee members, chairmen and reviewers. ISA is an American National Standards Institute (ANSI) accredited organization. ISA administers United States Technical Advisory Groups (USTAGs) and provides secretariat support for International Electrotechnical Commission (IEC) and International Orga
24、nization for Standardization (ISO) committees that develop process measurement and control standards. To obtain additional information on the Societys standards program, please write: International Society of Automation (ISA) Attn: Standards Department 67 Alexander Drive P.O. Box 12277 Research Triangle Park, NC 27709 ISBN: 978-1-937560-64-5
