1、 AMERICAN NATIONAL STANDARD ANSI/ISA-12.27.01-2011 Requirements for Process Sealing Between Electrical Systems and Flammable or Combustible Process Fluids Approved 5 October 2011 ANSI/ISA-12.27.01-2011 Requirements for Process Sealing Between Electrical Systems and Flammable or Combustible Process F
2、luids ISBN: 978-1-937560-13-3 Copyright 2011 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 means (electr
3、onic 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-12.27.01-2011 Preface This preface, as well as all footnotes and annexes, is included for info
4、rmation purposes and is not part of ANSI/ISA-12.27.01-2011, unless specifically marked as “Normative.“ This document has been prepared as part of the service of ISA toward a goal of uniformity in the field of instrumentation. To be of real value, this document should not be static but should be subj
5、ect 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) 549-8288; E-mail:
6、 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 the benefit
7、s 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, recommende
8、d 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 (b) 1.75 times the maximum working pressure plus 3,500 kPa for working pressures over 14 MPa and up
9、to 70 MPa; or (c) 1.3 times the maximum working pressure plus 35,000 kPa for working pressures over 70 MPa. TmaxTmin time 1,5 kPa? Verify limited pressure effectiveness (5.4)noyesNo tests required Purged+ pressurized equipment4.5 yesAdd-on secondary seal 4.6 Secondary Seal Leakage Test (5.3.5) yesTh
10、is 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 volunteer committee members
11、, 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 Organization for Standardization (ISO) committees that develop process measurement and control standards. To obtain additional information on the Societys standards program, please write: ISA Attn: Standards Department 67 Alexander Drive P.O. Box 12277 Research Triangle Park, NC 27709 ISBN: 978-1-937560-13-3
