CGA-G-1.1-1998-R2004.pdf
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1、 CGA G-1.11998 COMMODITY SPECIFICATION FOR ACETYLENE THIRD EDITION REAFFIRMED 2004 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-1.11998 PLEASE NOTE: The information conta
2、ined 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 members, jointly or severally, make no guarantee of the re
3、sults 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, equipment or device is contained within, or that abnormal or u
4、nusual 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 for consideration. In connection with such review, any s
5、uch 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 confused with Federal, state, provincial, or municipal
6、 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 listing of all publications, audiovisual programs, safety an
7、d 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 03-37 Gas Specifications Committee NOTETechnical changes from the previous edition are underlined. NOTEThis reaffirmed editi
8、on may include minor editorial changes; however, all technical information is the same as the 1998 edition. REAFFIRMED: 2004 THIRD EDITION: 1998 SECOND EDITION: 1990 FIRST EDITION: 1972 1998 BY THE COMPRESSED GAS ASSOCIATION, INC. ALL RIGHTS RESERVED. 4221 WALNEY ROAD, 5TH FLOOR, CHANTILLY, VA 20151
9、 Printed in U.S.A. CGA G-1.11998 COMPRESSED GAS ASSOCIATION, INC. PAGE iii Contents Page 1 Scope .1 2 Classification 1 2.1 Quality verification levels (grades).1 2.2 Quality tests.1 3 Quality verification systems2 3.1 Production qualification tests.2 3.2 Analytical requirements of the production qua
10、lification tests.2 3.3 Lot acceptance tests2 4 Sampling 2 4.1 Sample size.2 4.2 Acetylene samples 3 5 Analytical procedures.3 5.1 Parameters of analysis3 5.2 Percent acetylene4 5.3 Phosphine/arsine content4 5.4 Hydrogen sulfide content.4 6 Cylinders 5 6.1 Acetylene cylinders5 6.2 Cylinder preparatio
11、n5 6.3 Valves on acetylene cylinders.5 6.4 Pressure relief devices on acetylene cylinders6 7 References.6 Tables Table 1Directory of limiting characteristics1 Table 2Typical uses.1 This page is intentionally blank. CGA G-1.11998 COMPRESSED GAS ASSOCIATION, INC. PAGE 1 1 Scope This document describes
12、 specification requirements for gaseous acetylene as listed in Table 1. All future refer- ences should be to the current edition of CGA G-1.1, Commodity Specification for Acetylene. NOTEThis document does not attempt to recommend or establish end usage designations for specific types or grades of pr
13、oducts. It is suggested that users requiring this kind of information contact individual gas acetylene suppliers. 2 Classification 2.1 Quality verification levels (grades) Table 1 presents the component maxima, in parts per million, ppm (v/v), unless shown otherwise for the quality verification leve
14、ls of gaseous acetylene. A blank indicates no maximum limiting characteristic. The absence of a listed quality verification level does not mean to imply that the limiting characteristic is or is not present, but merely indicates that the test is not required for compliance with the specification. Ta
15、ble 1Directory of limiting characteristics (Units in ppm (v/v) unless otherwise stated) Quality verification levels (grades) Maxima for gaseous acetylene 1) Limiting characteristics A C H Acetylene minimum percent assay 95 98 99.6 Phosphine and arsine 500 2) 25 Hydrogen sulfide 500 2) 25 1) Cylinder
16、 acetylene entails variable percentage quantities of solvent (normally acetone, boiling point 133 F 56.1 C). The amount of solvent present in the expelled gas is de- pendent upon the vapor pressure of the solvent, the conditions of the cylinder, and the conditions of withdrawal. The purities listed
17、in Table 1 are given on a solvent-free basis. 2) Acetylene manufactured from hydrocarbon feedstock is inherently free from phosphine, arsine, and hydrogen sulfide. However, phosphine, arsine, and hydrogen sulfide levels in acetylene produced from a water/calcium carbide reaction are not routinely ch
18、ecked by the acetylene producer (due to the noncritical nature of the usewelding and cut- ting). These purity levels traditionally have been based on the calcium carbide pro- ducers raw material information. Table 2Typical uses CGA grade Typical uses A Welding, cutting, and brazing C Welding, cuttin
19、g, and brazing H Atomic adsorption analysis NOTETypical uses defined in this table are not all inclusive. 2.2 Quality tests The supplier ensures, by standard practice, the quality verification level of gaseous acetylene. If otherwise re- quired, alternative control procedures are described in 3.3.1;
20、 3.3.2; Section 4; and Section 5. Other control pro- cedures not listed in this specification are acceptable if agreed upon between the supplier and the customer. CAUTION: Acetylene is flammable and can be an asphyxiant. -,-,- PAGE 2 COMPRESSED GAS ASSOCIATION, INC. CGA G-1.11998 3 Quality verificat
21、ion systems 3.1 Production qualification tests These tests are a single analysis or a series of analyses performed on the product to ensure the reliability of the production facility to supply gaseous acetylene of the required quality verification level. This production qualification can be verified
22、 by the analytical records of product from the supplier; or, if required, by analysis of representative samples of the product from the facility at appropriate intervals as agreed upon between the supplier and the customer. Production qualification tests may be performed by the supplier or by a labo
23、ratory agreed upon between the supplier and the customer. 3.2 Analytical requirements of the production qualification tests These will include the determination of all limiting characteristics of gaseous acetylene. 3.3 Lot acceptance tests These are analyses performed on the gaseous acetylene from t
24、he cylinder, or a sample thereof that is repre- sentative of the lot. 3.3.1 Lot definitions One of the following is to be used: no specific quantity or any quantity of gaseous acetylene agreed upon between the supplier and the cus- tomer; all of the gaseous acetylene supplied during the contract per
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