CGA-G-1.9-2008.pdf
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1、 CGA G-1.92008 RECOMMENDED PRACTICES FOR MAINTAINING THE PROPER SOLVENT LEVEL IN ACETYLENE CYLINDERS 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 ASSOCIATION CGA G-1.92008 PLEASE N
2、OTE: 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 members, jointly or severally, m
3、ake 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, equipment or device is contained wit
4、hin, 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 Association invites comments and suggestions for consideration. In connection
5、 with such review, any such comments or suggestions will be fully reviewed by the Association after giving the party, upon request, a reasonable opportunity to be heard. Proposed changes may be submitted via the Internet at our web site, . This document should not be confused with Federal, state, pr
6、ovincial, 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 listing of all publications, audiovisu
7、al 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 00-58 Acetylene Committee FIRST EDITION: 2008 2008 The Compressed Gas Association, Inc. All rights
8、reserved. All materials contained in this work 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 information storage and retrieval syst
9、em without permission in writing from The 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, copyrigh
10、t or other notice from this work. -,-,- CGA G-1.92008 COMPRESSED GAS ASSOCIATION, INC. PAGE iii Contents Page 1 Introduction.1 2 Scope and purpose1 2.1 Scope 1 2.2 Purpose.1 3 Definitions.1 4 Construction and function of acetylene cylinders.2 4.1 General2 4.2 Shell.2 4.3 Porous mass (filler)2 4.4 So
11、lvent.3 4.5 Free volume.3 5 Solvent adjustment theory4 5.1 General4 5.2 Cylinder temperature.4 5.3 Cylinder pressure 4 5.4 Cylinder weigh-in.4 5.5 Residual acetylene4 5.6 Solvent addition calculation.5 6 Solvent adjustment in practice .6 6.1 General6 6.2 Example determination of required solvent add
12、ition .6 6.3 New cylinder information.7 7 Acetone tables7 7.1 General7 7.2 Acetone residual gas tables 7 7.3 Acetone unitary table.12 7.4 Acetylene solubility in acetone (included for reference)12 8 Dimethylformamide tables13 8.1 General13 8.2 Dimethylformamide residual gas tables 13 8.3 Dimethylfor
13、mamide unitary table.17 8.4 Acetylene solubility in DMF (included for reference).17 9 References.18 10 Additional references18 Figure Figure 1Typical volume distribution for a 145 ft3 cylinder3 Tables Table 1Residual gas for acetone at 30 F to 40 F7 Table 2Residual gas for acetone at 40 F to 50 F8 T
14、able 3Residual gas for acetone at 50 F to 60 F8 Table 4Residual gas for acetone at 60 F to 70 F9 Table 5Residual gas for acetone at 70 F to 80 F9 Table 6Residual gas for acetone at 80 F to 90 F10 Table 7Residual gas for acetone at 90 F to 100 F10 Table 8Residual gas for acetone (MC or B) 11 PAGE iv
15、COMPRESSED GAS ASSOCIATION CGA G-1.92008 Table 9Unitary values table (lb of acetylene per lb of acetone above saturation gas)12 Table 10Solubility values based upon formula (g/kg)12 Table 11Residual gas for DMF at 30 F to 40 F.13 Table 12Residual gas for DMF at 40 F to 50 F.14 Table 13Residual gas f
16、or DMF at 50 F to 60 F.14 Table 14Residual gas for DMF at 60 F to 70 F.15 Table 15Residual gas for DMF at 70 F to 80 F.15 Table 16Residual gas for DMF at 80 F to 90 F.16 Table 17Residual gas for DMF at 90 F to 100 F.16 Table 18Unitary values (lb of acetylene per lb of DMF above saturation gas)17 Tab
17、le 19Solubility values based upon formula (g/kg)17 -,-,- CGA G-1.92008 COMPRESSED GAS ASSOCIATION, INC. PAGE 1 1 Introduction This publication is one of a series compiled by the Compressed Gas Association, Inc. (CGA) to meet the demand for information on compressed gases, cryogenic liquids, and rela
18、ted products. 2 Scope and purpose 2.1 Scope This publication covers recommendations for maintaining the proper solvent level in acetylene cylinders. While the background, precautions, and general procedures given apply to all solvents in use with acetylene, special emphasis is given to the use of ac
19、etone and dimethylformamide (DMF). Included are residual gas tables based upon the best available data that reflects current industry practice. The expected accuracy of these values is approximately 10%, and should be used as a guide only. Note that these tables make use of acetylene solubilities as
20、 generated by the appropriate formulas as found in Appendix B of BS EN 1801:1999, Transportable gas cylinders: Filling conditions for single acetylene cylinders 1.1 The guidelines contained in this publication apply to acetylene cylinders manufactured to: U.S. Department of Transportation (DOT) Spec
21、ifications 8 and 8AL found in Title 49 of the U.S. Code of Federal Regulations (CFR) 178.59 and 178.60 and used per CFR 173.303 as well as older specifications cylinders ICC-8, ICC-8AL, DOT E-6517, DOT E-7542 or DOT E-10320 2; or Specifications TC 8WM and 8WAM found in Canadian Standards Association
22、 (CSA) standard B339, Cylinder, Spheres, Tubes and Other Containers for the Transportation of Dangerous Goods, and used in accordance with Transportation of Dangerous Goods Regulations of Transport Canada (TC) found in CSA B340, Selection of Cylinders, Spheres, Tubes, and Other Containers for the Tr
23、ansportation of Dangerous Goods, Class 2, as well as older specifications cylinders CTC-8, CTC-8AL, or CTC-8WC 3, 4, 5. 2.2 Purpose This publication has been prepared as a guide for maintaining the proper solvent level in acetylene cylinders. It should be of interest to acetylene manufacturers, acet
24、ylene production and distribution personnel, authorized acetylene cylinder reinspection facilities, welding gas distributors, safety personnel, and users of acetylene. 3 Definitions For the purpose of this publication, the following definitions shall apply. 3.1 Acetylene cylinder shell Metal pressur
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