CGA-G-5.5-2004-R2007.pdf
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1、 CGA G-5.52004 REAFFIRMED 2007 HYDROGEN VENT SYSTEMS SECOND 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 ASSOCIATION, INC. CGA G-5.52004 PLEASE NOTE: The information contained in this do
2、cument 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 members, jointly or severally, make no guarantee of the results and assum
3、e 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, equipment or device is contained within, or that abnormal or unusual circumst
4、ances 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 suggestions for consideration. In connection with such review, any such comments or
5、 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 not be confused with Federal, state, provincial, or municipal specifications
6、 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 listing of all publications, audiovisual programs, safety and technical bul
7、letins, 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 07-026 Hydrogen Technology Committee NOTETechnical changes from the previous edition are underlined. NOTENo technical information has be
8、en changed from the 2004 edition. This reaffirmed edition may include minor editorial changes. REAFFIRMED: 2007 SECOND EDITION 2004 FIRST EDITION: 1996 2004 The Compressed Gas Association, Inc. All rights reserved. All materials contained in this work are protected by United States and international
9、 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 Compressed Gas Association, Inc. All requests for p
10、ermission 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. -,-,- CGA G-5.52004 COMPRESSED GAS ASSOCIATION, INC. PAGE i
11、ii Contents Page 1 Introduction.1 2 Scope .1 3 Definitions.1 4 Properties of hydrogen.1 4.1 Flammability 1 4.2 Temperature impact 2 4.3 Diffusion.2 4.4 Asphyxiant.2 4.5 Liquid hydrogen.2 4.6 Embrittlement 2 5 System considerations .2 5.1 Hydrogen discharges.2 5.2 Mechanical considerations3 5.3 Fire
12、considerations3 5.4 Deflagration/detonation considerations.3 6 Vent system3 6.1 Codes3 6.2 Sizing.4 6.3 Design .4 6.4 Materials6 6.5 Components7 7 Installation 7 8 Operation8 9 Maintenance.9 9.1 Visual inspection9 9.2 Physical inspection9 9.3 Field repairs.9 10 References.9 Figure Figure 1Miter cut6
13、 This page is intentionally blank. -,-,- CGA G-5.52004 COMPRESSED GAS ASSOCIATION, INC. PAGE 1 1 Introduction This publication provides information for personnel who design, install, and maintain hydrogen vent systems. For the purpose of this standard, the use of the word should indicates a recommen
14、dation and the use of the word shall indicates a requirement. 2 Scope This publication presents design guidelines for hydrogen vent systems used in gaseous and liquid hydrogen systems at consumer sites and provides recommendations for safe operation of these vents. It begins at the discharge port of
15、 the safety devices and other components that control the release of hydrogen and ends at the point where hydrogen concentration in the atmosphere is below the lower flammable limits. It also provides information on the production, transportation, handling, and storage of compressed hydrogen, cryoge
16、nic liquid hydrogen, and related products. Additional information on hydrogen can be found in CGA G-5, Hydrogen, CGA G-5.4, Standard for Hydrogen Piping at Consumer Locations, CGA Handbook of Compressed Gases, NFPA 50A, Standard for Gaseous Hydrogen Systems at Consumer Sites, and NFPA 50B, Standard
17、for Liquefied Hydrogen Systems at Consumer Sites 1, 2, 3, 4, 5.1 3 Definitions For the purpose of this standard, the following definitions apply. 3.1 ASME Code American Society of Mechanical Engineers (ASME) B31.3, Process Piping 6. 3.2 Gaseous hydrogen storage system System in which hydrogen is del
18、ivered, stored, and discharged in gaseous form to the consumers piping. NOTEA gaseous hydrogen storage system includes stationary containers or transport containers used as stationary stor- age for temporary supply; pressure regulators; pressure relief devices; manifolds; interconnecting piping; and
19、 controls. The system terminates where hydrogen at service pressure first enters the customer supply line. Pressure relief devices for cyl- inders required by the U.S. Department of Transportation (DOT) in Title 49 of the U.S Code of Federal Regulations (49 CFR) are not covered in this definition 7.
20、 3.3 Liquid hydrogen storage system System in which hydrogen is delivered and stored as a liquid and from which it is discharged in liquid or gase- ous form to the consumers piping. NOTEA liquid hydrogen storage system can include stationary or portable containers, pressure regulators, pressure reli
21、ef devices, manifolds, interconnecting piping, and controls as required. The system originates at the storage container fill con- nection and terminates where hydrogen at service pressure first enters the customer supply line. 4 Properties of hydrogen Hydrogen is a flammable gas. It is colorless, od
22、orless, tasteless, and nontoxic. It is the lightest gas known, hav- ing a specific gravity of 0.0696 (air = 1.0). Gaseous hydrogen is buoyant in air at normal temperatures. Hydro- gen diffuses rapidly in air and through porous materials. Hydrogen burning in air has a pale blue flame that is nearly i
23、nvisible. 4.1 Flammability At atmospheric pressure the ignition temperature of hydrogen-air mixtures has been reported to be as low as 932 F (500 C). The flammable limits of hydrogen-air mixtures depend on pressure, temperature, and water vapor content. At atmospheric pressure the flammable range is
24、 approximately 4% to 75% by volume of hydro- 1 References are shown by bracketed numbers and are listed in order of appearance in the reference section. -,-,- PAGE 2 COMPRESSED GAS ASSOCIATION, INC. CGA G-5.52004 gen in air 8. Hydrogen-air mixtures are extremely easy to ignite; only requiring 0.02 m
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