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1、 CGA G-10.12008 COMMODITY SPECIFICATION FOR NITROGEN SEVENTH 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-10.12008 PLEASE NOTE: The information contained in this
2、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 results and ass
3、ume 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 circum
4、stances 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
5、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 specificatio
6、ns 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 b
7、ulletins, 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 08-021 Atmospheric Gases and Equipment Committee NOTETechnical changes from the previous edition are underlined. SEVENTH EDITION: 2008
8、 SIXTH EDITION: 2004 FIFTH EDITION: 1997 FOURTH EDITION: 1991 2008 The Compressed Gas Association, Inc. All rights 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 a
9、ny 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 permission to reproduce material from this work should be directed to The Compressed Gas As
10、sociation, 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-10.12008 COMPRESSED GAS ASSOCIATION, INC. PAGE iii Contents Page 1 Scope .1 2 Classification 1 2.1 Types.1 2.2 Quality verification levels (gra
11、des).1 2.3 Quality tests.2 3 Quality verification systems2 3.1 Production qualification tests.2 3.2 Analytical requirements of the production qualification tests.2 3.3 Lot acceptance tests2 4 Sampling 3 4.1 Sample size.3 4.2 Gaseous samples3 4.3 Liquid samples.3 5 Analytical procedures.4 5.1 Paramet
12、ers of analysis4 5.2 Percent nitrogen4 5.3 Water content5 5.4 Total hydrocarbon content.5 5.5 Oxygen content .5 5.6 Hydrogen content6 5.7 Argon, helium, and neon content 6 5.8 Carbon monoxide content .6 5.9 Carbon dioxide content7 5.10 Permanent particulates of Type II.7 5.11 Odor detection.7 5.12 N
13、F tests.7 6 Containers7 6.1 Nitrogen containers .7 6.2 Container preparation8 6.3 Nitrogen NF.8 6.4 Valves on nitrogen containers.8 6.5 Pressure relief devices8 7 Moisture conversion data.8 8 References.11 Tables Table 1Directory of limiting characteristics1 Table 2Typical uses.2 Table 3Moisture con
14、version data 20 .9 -,-,- This page is intentionally blank. -,-,- CGA G-10.12008 COMPRESSED GAS ASSOCIATION, INC. PAGE 1 1 Scope This publication describes specification requirements for gaseous and liquid nitrogen. The term container as used in this publication shall refer to portable compressed gas
15、 cylinders and liquid con- tainers made in accordance with Title 49 of the U.S. Code of Federal Regulations (49 CFR) Parts 100-180; Transport Canadas (TC) Transportation of Dangerous Goods Regulations; or ASME Boiler and Pressure Ves- sel Code, Section VIII, Div 1 1, 2, 3.1 This publication does not
16、 attempt to recommend or establish end usage designations for specific types of grades of products. Users requiring this kind of information should contact individual gas suppliers. 2 Classification 2.1 Types Gaseous nitrogen is denoted as Type I and liquid nitrogen as Type II. 2.2 Quality verificat
17、ion levels (grades) Table 1 presents the component maxima in parts per million (ppm v/v) unless otherwise stated for the quality verification levels (QVLs) of nitrogen. A blank indicates no maximum limiting characteristic. The absence of a value in a listed QVL does not mean to imply that the limiti
18、ng characteristic is or is not present, but merely indi- cates that the test is not required for compliance with the specification. Typical uses are listed in Table 2. Table 1Directory of limiting characteristics (Units in ppm (v/v) unless otherwise shown) QVLs (grades) Maximums for gaseous and liqu
19、id nitrogen Limiting characteristics B L M Q R S Nitrogen min. % 1) 99.0 99.998 99.999 99.999 99.9987 99.9999 Argon, neon, helium 5 Carbon dioxide 3) 1 0.2 Carbon monoxide 10 5 5 0.2 Hydrogen 1 2 0.2 Odor None Oxygen 10 000 10 5 1 3 0.2 Permanent particulates 2) Total hydrocarbon content (as meth- a
20、ne) 5 1 1 0.2 Water Dew point F C 3) 4 89 67.2 2 97 71.7 2 97 71.7 1 105 76.1 0.2 130 90 1) Unless otherwise shown, percent nitrogen includes trace quantities of neon, helium, and argon. 2) To be determined between supplier and user. 3) Nitrogen used in food processing shall meet the Grade B require
21、ments as well as additional requirements for car- bon dioxide and water content as specified in the Food Chemicals Codex 4. 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-10.12008 Table 2
22、Typical uses CGA grade Typical uses B Medical nitrogen NF 1), food L General industrial usage, process gases, inerting, food, heat treatment applications M High purity industrial uses, blanketing, food, heat treatment applications Q Analytical/instrumentation applications R Semiconductor, purging S
23、Semiconductor applications, very large scale integration NOTEUses defined in this table are not all inclusive. 1) National Formulary (NF) requires an identity test for nitrogen be performed using one of the methods in 5.2. 2.3 Quality tests The supplier ensures by standard practice the QVL of nitrog
24、en. If otherwise required, alternative control proce- dures are described in 3.3.1, 3.3.2, and Sections 4 and 5. Other control procedures not listed in this specifica- tion are acceptable if agreed upon between the supplier and the customer. WARNING: Nitrogen can act as an asphyxiant by displacing t
25、he amount of oxygen necessary to support life. For additional information, see CGA P-9, The Inert Gases: Argon, Nitrogen, and Helium 5. 3 Quality verification systems 3.1 Production qualification tests Production qualification tests are either a single analysis or series of analyses performed on the
26、 product to en- sure the reliability of the production facility to supply nitrogen of the required QVL. This production qualification can be verified by the analytical records of product from the supplier; or, if required, by the analyses of repre- sentative samples of the product from the facility
27、at appropriate intervals as agreed upon between the supplier and the customer. Production qualification tests can be performed by the supplier or by a laboratory agreed upon between the supplier and the customer. 3.2 Analytical requirements of the production qualification tests Analytical requiremen
28、ts of the production qualification tests include the determination of all limiting characteris- tics of nitrogen. 3.3 Lot acceptance tests Lot acceptance tests are analyses performed on the nitrogen in the shipping container or a sample thereof that is representative of the lot. 3.3.1 Lot definition
29、s One of the following lot definitions shall be used: no specific quantity or any quantity of nitrogen agreed upon between the supplier and the customer; all of the nitrogen supplied during the contract period; all of the nitrogen supplied or containers filled during a calendar month; all of the nit
30、rogen supplied or containers filled during seven consecutive days; all of the nitrogen supplied or containers filled during a consecutive 24-hr period; -,-,- CGA G-10.12008 COMPRESSED GAS ASSOCIATION, INC. PAGE 3 all of the nitrogen supplied or containers filled during a continuous workshift; all of
31、 the nitrogen supplied in one shipment; all of the nitrogen supplied in one shipping container; all of the nitrogen supplied in the container(s) filled on one manifold at the same time; or all of the nitrogen supplied or containers filled during an uninterrupted filling sequence. 3.3.2 Number of sam
32、ples per lot The number of samples per lot shall be in accordance with either one sample per lot or any number of samples agreed upon by the supplier and the customer. 4 Sampling 4.1 Sample size The quantity of nitrogen in a single sample container should be sufficient to perform the analyses for al
33、l of the limiting characteristics. If a single sample does not contain a sufficient quantity of nitrogen to perform all of the analyses for the required QVL, additional samples from the same lot shall be taken under similar conditions. 4.2 Gaseous samples Gaseous samples shall be representative of t
34、he nitrogen supply. Samples shall be obtained in accordance with one of the following: By filling the sample container and delivery containers at the same time, on the same manifold, and in the same manner; By withdrawing a sample from the supply container through a suitable connection into the samp
35、le con- tainer. No regulator shall be used between the supply and the sample container (a suitable purge valve is permissible); CAUTION: For safety reasons the sample container and sampling system shall have a rated service pres- sure at least equal to the pressure in the supply container. By connec
36、ting the container being sampled directly to the analytical equipment using suitable pressure regulation to prevent overpressurizing this equipment; or By selecting a representative container from the containers filled in the lot. 4.3 Liquid samples Liquid samples shall be representative of the liqu
37、id nitrogen supply. Samples shall be obtained in accordance with one of the following: By withdrawing a sample directly through an analytical filter system (see 5.11); By vaporizing liquid nitrogen from the supply container in the sampling tubing; or By flowing liquid nitrogen from the supply contai
38、ner into or through a suitable container in which a repre- sentative sample is collected and then vaporized. WARNING: Sampling of liquid nitrogen can be hazardous due to its asphyxiant characteristics and can cause serious cryogenic burns if handled without the proper personal protective equipment.
39、-,-,- PAGE 4 COMPRESSED GAS ASSOCIATION, INC. CGA G-10.12008 5 Analytical procedures 5.1 Parameters of analysis The parameters for analytical techniques contained in this section are: 5.1.1 Percent Percent (v/v) = parts per hundred by volume 5.1.2 Parts per million ppm (v/v) = parts per million by v
40、olume 5.1.3 Parts per billion ppb (v/v) = parts per billion by volume 5.1.4 Water/dew point Water/dew point is expressed in ppm (v/v) and F at 1 atm abs (101 kPa, abs).2 To convert to other units, see Section 7. 5.1.5 Total hydrocarbon content Total hydrocarbon content (THC) (as methane) for the pur
41、pose of this specification is defined as the single car- bon atom equivalent. 5.1.6 Calibration gas standards Calibration gas standards containing the applicable gaseous components may be required to calibrate the ana- lytical instruments used to determine the limiting characteristic levels of nitro
42、gen. If required by the customer, the accuracy of the measuring equipment used in preparing these standards shall be traceable to the National Institute of Standards and Technology (NIST).3 5.1.7 Analytical equipment Analytical equipment shall be operated and properly calibrated in accordance with t
43、he manufacturers instruc- tions. 5.1.8 United States Pharmacopeia and National Formulary NF refers to the test requirements for nitrogen contained in the United States Pharmacopeia and National For- mulary (USPNF), which has nitrogen in the NF section 7. 5.1.9 Other analytical procedures Analytical
44、procedures not listed in this specification are acceptable if agreed upon between the supplier and the customer. 5.2 Percent nitrogen The percent nitrogen shall be determined by one of the following methods: 2 kPa shall indicate gauge pressure unless otherwise noted as (kPa, abs) for absolute pressu
45、re or (kPa, differential) for dif- ferential pressure. All kPa values are rounded off per CGA P-11, Metric Practice Guide for the Compressed Gas Industry 5. 3 NIST, 100 Bureau Dr., Stop 3460, Gaithersburg, MD 20899. www.nist.gov -,-,- CGA G-10.12008 COMPRESSED GAS ASSOCIATION, INC. PAGE 5 5.2.1 Gas
46、chromatograph By determining the oxygen content by a gas chromatograph. This method can be used not only for the oxygen determination, but also for the determination of many limiting characteristic gaseous components. Appropriate impurity concentrating techniques may be used to attain the necessary
47、sensitivity. The analyzer shall be cali- brated at appropriate intervals by using calibration gas standards (see 5.1.6). The analyzers shall be operated in a manner to accurately measure the limiting characteristics as defined in Table 1. The percent nitrogen is the value obtained when this amount e
48、xpressed as a percent (v/v) is subtracted from 100%; 5.2.2 Determining aggregate impurities By determining the amount of the aggregate impurities using the methods in the following sections. The percent nitrogen is the value obtained when this amount expressed as percent (v/v) is subtracted from 100%; or 5.2.3 Mass spectrometer By determining the aggregate of all impurities by mass spectrometer. The percent nitrogen is the value ob- tained when the aggregate e