CGA-G-4.4-2003.pdf
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1、 CGA G-4.42003 (EIGA Doc 13/02) OXYGEN PIPELINE SYSTEMS FOURTH 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-4.42003 EIGA DOC13/02 PREFACE As part of a program of
2、harmonization of industry standards, the European Industrial Gases Association (EIGA) and the Compressed Gas Association (CGA) formed an ad hoc task force with the goal of combining the sepa- rate oxygen pipeline standards of each organization into one harmonized standard on oxygen pipelines. This s
3、tandard is intended as a joint EIGA/CGA international harmonized standard for the use and application of all members of EIGA and CGA worldwide. The CGA edition is identical in technical content to the EIGA edition except for regional regulatory requirements (noted), and it has minor changes in forma
4、tting and spelling. 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 memb
5、ers, 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, equipmen
6、t 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 suggestions fo
7、r 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 not be
8、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 listin
9、g 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: . Docket 99-90 Atmospheric Gases and Equipment Committee NOTEAppendices C, D, E
10、, and F (Normative) are required. NOTEAppendices A, B, and G (Informative) are for information only. FOURTH EDITION: 2003 2003 BY THE COMPRESSED GAS ASSOCIATION, INC. ALL RIGHTS RESERVED. 4221 WALNEY ROAD, 5TH FLOOR, CHANTILLY, VA 20151 Printed in U.S.A. CGA G-4.42003 COMPRESSED GAS ASSOCIATION, INC
11、. PAGE III EIGA DOC 13/02 Contents Page 1 Introduction.1 2 Scope and purpose1 3 Definitions.2 4 Design philosophy4 4.1 General criteria4 4.1.1 Causes of fire: Ignition mechanisms and kindling chain.4 4.1.2 Hazards analysis and risk assessment.5 4.1.3 General design precautions6 4.2 Metallic material
12、s, combustion resistant alloys, exemption pressure6 4.2.1 Flammability testing6 4.2.2 Velocity exemption pressures for standard purity oxygen 7 4.2.3 Reduced purity oxygen-enriched atmospheres 7 4.2.4 Ultra high purity (UHP) oxygen atmospheres .8 4.2.5 Very high pressure (VHP) oxygen applications 8
13、4.2.6 Temperature limitations 9 4.3 Nonmetallic materials9 4.3.1 Properties and risks9 4.3.2 Design practices and material selection .10 4.4 Velocity and gas pressure criteria .11 4.4.1 General.11 4.4.2 Impingement velocity curve and metallic material selection for piping and equipment 11 4.4.3 Velo
14、city limitations in nonimpingement sites 12 4.5 Piping systems 13 4.5.1 Underground piping systems13 4.5.2 Aboveground piping systems14 4.5.3 Pipeline markers.14 4.5.4 Cathodic protection.14 4.6 Siting, remote operation, use of barriers .14 5 Piping, valves, and equipment .15 5.1 General criteria15
15、5.1.1 Material selection criteria15 5.2 Piping and fittings15 5.2.1 Impingement sites.15 5.2.2 Nonimpingement sites 16 5.2.3 Specific piping locations .16 5.3 Valves17 5.3.1 General.17 5.3.2 Valve functions .18 5.3.3 Valve types .19 5.3.4 Valve seals and packing.21 5.3.5 Other possible sources of ig
16、nition in valves21 5.4 Equipment .21 5.4.1 Conical strainers.21 5.4.2 Filters22 5.4.3 Flow-measuring devices.23 5.4.4 Bursting disks .23 5.4.5 Insulating joints.24 5.4.6 Flexible connections .24 5.4.7 Miscellaneous equipment items25 5.4.8 Protection systems .25 5.5 Lubricants25 PAGE iv COMPRESSED GA
17、S ASSOCIATION, INC. CGA G-4.42003 EIGA DOC 13/02 6 Cleaning .26 6.1 General requirements26 6.1.1 Cleaning strategy26 6.1.2 Standard of cleanliness 26 6.1.3 Cleaning methods.26 6.1.4 Pipeline components 27 6.1.5 Welding.27 6.1.6 Pressure testing27 6.1.7 Installation of pipeline equipment .27 6.2 Spec
18、ification and manufacture of line pipe material28 6.2.1 General requirements.28 6.2.2 Codes and standards28 6.2.3 Manufacturing process .28 6.2.4 Heat treatment28 6.2.5 Hydrostatic test.28 6.3 Pre-cleaned piping.28 6.3.1 General.28 6.3.2 Pipe fabrication.28 6.3.3 Pressure testing29 6.3.4 Internal su
19、rface finish29 6.3.5 Preparation for shipment 29 6.3.6 Maintaining cleanliness.29 6.3.7 Final cleaning30 6.3.8 Leak testing and blowout30 6.4 Post-installation cleaning.30 6.4.1 General.30 6.4.2 Pressure testing31 6.4.3 Internal surface finish31 6.4.4 Maintaining cleanliness.31 6.4.5 Leak testing an
20、d blowout31 6.5 Inspection31 6.5.1 Procedure .31 6.5.2 UVA light examination 31 6.5.3 Acceptance criteria .32 6.5.4 Remedial action32 6.5.5 Sealing, purging, and monitoring32 6.6 Records.32 7 Construction .32 7.1 General criteria32 7.2 Construction plan.33 7.3 Pipe fabrication and welding33 7.3.1 Ge
21、neral.33 7.3.2 Qualifications 33 7.3.3 Backing rings 33 7.3.4 Preparation for welding.34 7.3.5 Welding requirements for materials34 7.4 Assembly and installation34 7.4.1 Alignment34 7.4.2 Flanged joints .34 7.4.3 Insulating joints.35 7.4.4 Threaded joints.35 7.4.5 Valves.35 7.4.6 Supports, guides, a
22、nd anchors.36 7.5 Inspection and examination.36 7.6 Nondestructive testing.36 7.6.1 Pressure testing36 7.6.2 X-ray examination.37 7.7 Documentation 37 -,-,- CGA G-4.42003 COMPRESSED GAS ASSOCIATION, INC. PAGE V EIGA DOC 13/02 8 Design and construction of stations .38 8.1 Function.38 8.2 Design brief
23、 .38 8.2.1 Emergency shut-off valves .38 8.2.2 Isolation valves .38 8.2.3 Filters and strainers 38 8.2.4 Flowmeters .39 8.2.5 Flow and pressure control 39 8.2.6 Gas storage 39 8.2.7 Spill or vent control .39 8.2.8 Pressure relief and vent valves.39 8.2.9 Instruments.39 8.3 Standards and design codes
24、.40 8.4 Materials40 8.5 Barriers or screens40 8.5.1 Barrier requirements criteria .40 8.5.2 Design criteria.40 8.5.3 Operational requirements .41 8.6 Location.42 8.7 Earthing, grounding.43 8.8 Fabrication.43 8.9 Installation .43 8.10 Testing.43 8.10.1 Post fabrication.43 8.10.2 Post installation.43
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