CGA-E-14-2002-R2007.pdf
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1、 CGA E-142002 REAFFIRMED 2007 MAXIMUM LEAKAGE RATES (GAS TIGHTNESS) OF EQUIPMENT USED FOR WELDING, CUTTING, AND ALLIED PROCESSES FIRST EDITION COMPRESSED GAS ASSOCIATION, INC. 4221 Walney Road, 5th floor Chantilly, VA 20151 Phone: 703-788-2700 FAX: 703-961-1831 E-mail: PAGE ii COMPRESSED GAS ASSOCI
2、ATION, INC. CGA E-142002 PLEASE NOTE: The information contained in this document was obtained from sources believed to be reliable and is based on technical information and experience currently available from members of the Compressed Gas Association, Inc. and others. However, the Association or its
3、 members, jointly or severally, make no guarantee of the results and assume no liability or responsibility in connection with the information or suggestions herein contained. Moreover, it should not be assumed that every acceptable commodity grade, test or safety procedure or method, precaution, equ
4、ipment or device is contained within, or that abnormal or unusual circumstances may not warrant or suggest further requirements or additional procedure. This document is subject to periodic review, and users are cautioned to obtain the latest edition. The Associa- tion invites comments and suggestio
5、ns for consideration. In connection with such review, any such comments or suggestions will be fully reviewed by the Association after giving the party, upon request, a reasonable op- portunity to be heard. Proposed changes may be submitted via the Internet at our web site, . This document should no
6、t be confused with Federal, state, provincial, or municipal specifications or regulations; insurance requirements; or national safety codes. While the Association recommends reference to or use of this document by government agencies and others, this document is purely voluntary and not binding. A l
7、isting of all publications, audiovisual programs, safety and technical bulletins, and safety posters is available via the Internet at our website at . For more information contact CGA at Phone: 703-788-2700, ext. 799. E-mail: . Work Item 07-001 Industrial Gases Apparatus Committee NOTEAppendices A a
8、nd B (Normative) are a requirement. NOTENo technical information has been changed from the 2002 edition. This reaffirmed edition may include minor editorial changes. REAFFIRMED: 2007 FIRST EDITION: 2002 2002 The Compressed Gas Association, Inc. All rights reserved. All materials contained in this wo
9、rk are protected by United States and international copyright laws. No part of this work may be reproduced or transmitted in any form or by any means, electronic or mechanical including photocopying, recording, or any informa- tion storage and retrieval system without permission in writing from The
10、Compressed Gas Association, Inc. All requests for permission to reproduce material from this work should be directed to The Compressed Gas Association, Inc., 4221 Walney Road, Suite 500, Chantilly VA 20151. You may not alter or remove any trademark, copyright or other notice from this work. -,-,- CG
11、A E-142002 COMPRESSED GAS ASSOCIATION, INC. PAGE iii Contents Page 1 Introduction.1 2 Scope .1 3 Definitions.1 3.1 Leakage, external1 3.2 Leakage, internal.1 3.3 Leakage rate1 3.4 Leakage test, inboard1 3.5 Leakage test, outboard1 4 Test media1 5 Test pressures1 5.1 Welding/Cutting torches and attac
12、hments.1 5.2 Regulators.2 5.3 Flowmeters2 5.4 Check valves or multi-function devices that incorporate check valves2 5.5 Other devices 2 6 Maximum permissible leakage rates2 6.1 Torches2 6.2 Regulators.2 6.3 Flowmeters3 6.4 Check valves or multi-function devices that incorporate check valves3 6.5 Oth
13、er devices 3 7 Production tests3 7.1 Welding/Cutting torches and attachments.3 7.2 Regulators.3 7.3 Flowmeters3 7.4 Check valves or multi-function devices that incorporate check valves3 7.5 Other devices 3 8 Measurement of the leakage rate.3 9 References.4 Appendices Appendix ASpecific gravity corre
14、ction factor chart (Normative) 5 Appendix BEquivalent leak rates for water immersion bubble leak tests (Normative) 6 -,-,- This page is intentionally blank. CGA E-142002 COMPRESSED GAS ASSOCIATION, INC. PAGE 1 1 Introduction Compressed gas equipment is used in applications where leakage can create h
15、azardous conditions for per- sonnel. These hazards can include the risk of fire, explosion, or asphyxiation. This standard outlines the rec- ommended maximum leakage rates for various types of equipment. Additionally, this standard includes infor- mation that can be used by manufacturers, purchasers
16、, safety directors, and users of compressed gas equip- ment. The leak rate values have been compiled from existing CGA standards that address specific equipment. 2 Scope This standard specifies the maximum leakage rates allowed for equipment used in welding, cutting, and allied processes. It applies
17、 only to individual components of a system that are connected to an upstream gas supply. 3 Definitions For the purpose of this standard, the following definitions apply. 3.1 Leakage, external Unintentional escape of gas from a pressurized device to the atmosphere. 3.2 Leakage, internal Unintentional
18、 escape of gas from a pressurized device in a closed system. These leakages normally occur across operating valve seats and cause a rise in internal pressure. 3.3 Leakage rate Numerical expression for the amount of gas unintentionally leaked to the atmosphere, from the surrounding atmosphere, or ins
19、ide a closed system. In this standard, the leakage rates will be given in either cubic centime- ters per second (cc/s) or cubic centimeters per hour (cc/h). 3.4 Leakage test, inboard Method to determine the amount of leakage occurring through the device from the surrounding atmosphere. This is usual
20、ly accomplished by creating a vacuum inside the device and measuring the internal leakage of a tracer gas (normally helium) from the atmosphere with a mass spectrometer. 3.5 Leakage test, outboard Method to determine the amount of leakage in a device that is pressurized internally. The leakage may o
21、ccur to the atmosphere or inside a closed system. 4 Test media Devices to be used with helium or hydrogen shall be tested with helium. Devices to be used with other gases may be tested with helium; oil-free, dry air; or nitrogen. It is also permissible to test devices with their intended gas service
22、 provided the necessary safety precautions are taken. Results will be expressed in cc/s helium or cc/s air or nitrogen as it relates to the intended gas service. See Appendix A for additional information on test gases. 5 Test pressures 5.1 Welding/Cutting torches and attachments Minimum test pressur
23、e shall be 150 psig (1030 kPa) or the manufacturers maximum operating pressure, whichever is greater.1, 2 1 kPa shall indicate gauge pressure unless otherwise noted as (kPa, abs) for absolute pressure or (kPa, differential) for dif- ferential pressure. All kPa values are rounded off per CGA P-11, Me
24、tric Practice Guide for the Compressed Gas Industry 1. 2 References are shown by bracketed numbers and are listed in order of appearance in the reference section. PAGE 2 COMPRESSED GAS ASSOCIATION, INC. CGA E-142002 5.2 Regulators 5.2.1 Outboard leakage tests For outboard leakage tests, the required
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