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1、A Reference number ISO 3253:1998(E) INTERNATIONAL STANDARD ISO 3253 Second edition 1998-09-01 Gas welding equipment Hose connections for equipment for welding, cutting and allied processes Matriel de soudage aux gaz Raccords pour tuyaux souples pour appareils de soudage, coupage et techniques connex
2、es Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:31:48 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3253:1998(E) ISO1998 All rights reserved
3、. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 CH-121
4、1 Genve 20 Switzerland Internetisoiso.ch Printed in Switzerland ii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical
5、 committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with
6、 the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of th
7、e member bodies casting a vote. International Standard ISO 3253 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee SC 8, Equipment for gas welding, cutting and allied processes. This second edition cancels and replaces the first edition (ISO 3253:1975), of whic
8、h it constitutes a technical revision. Annex A of this International Standard is for information only. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:31:48 MDTNo reproduction
9、 or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISOISO 3253:1998(E) 1 Gas welding equipment Hose connections for equipment for welding, cutting and allied processes 1 Scope This International Standard lays down the dimensions and specifies the characteristics of the co
10、nstituent parts of hose connections for equipment for welding, cutting and allied processes. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicat
11、ed were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid Inter
12、national Standards. ISO 228-1:1994, Pipe threads where pressure-tight joints are not made on the threads Part 1: Dimensions, tolerances and designation. ISO 261:1998, ISO general-purpose metric screw threads General plan. ISO 9539:1988, Materials for equipment used in gas welding, cutting and allied
13、 processes. 3 General The gas pipe threads shall be in accordance with the requirements of ISO 228-1. All other dimensions are given in millimetres. The joint is made with a under cone and cone seal (see figure 1). Key 1Hose coupling nipple 2Union nut 3Threaded union Figure 1 Hose connection Copyrig
14、ht International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:31:48 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3253:1998(E) ISO 2 4 Material The material shall c
15、onform to ISO 9539. 5 Dimensions 5.1 General The dimensions of threaded union, union nut and hose coupling nipple shall be as specified in 5.2, 5.3 and 5.4. 5.2 Threaded union A threaded union is shown in figure 2 and the dimensions and tolerances of threaded unions are given in table 1. Figure 2 Th
16、readed union Table 1 Dimensions and tolerances of threaded union Thread (d1)D 1) a1 2) min. b1 JS15 d2 max. G1/86,57,51,25 G1/48,39,51,47 G3/811,510,51,810 G1/213,912212 G3/418,513,52,216 G12414,52,422 1) Datum diameter (nominal diameter of contact). 2) Effective length of thread. Copyright Internat
17、ional Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:31:48 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO 3253:1998(E) 3 Tolerances for external thread according to
18、 class A. The dimensions not given are left to the discretion of the manufacturer. Type of thread to be used: right-hand for oxygen and non-fuel gases; left-hand for fuel gases. NOTE For those countries using metric threads according to ISO 261 the dimensions are given in annex A. 5.3 Union nut A un
19、ion nut is shown in figure 3 and the dimensions and tolerances of union nuts are given in table 2. a) With left-hand threadb) With right-hand thread 1) optional undercut Figure 3 Union nut Table 2 Dimensions and tolerances of union nut Thread (d1)b2 min. c1 JS15 d3 H12 d4 h14 h h14 s h11 G1/88106,51
20、11211 G1/41012,59,51715,517 G3/810,513,512,51916,519 G1/21316,514,52420,524 G3/41518,519,53022,530 G11721,525,54126,541 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:31:48 M
21、DTNo reproduction or networking permitted without license from IHS -,-,- ISO 3253:1998(E) ISO 4 The dimensions not given are left to the discretion of the manufacturer. Type of thread to be used: right-hand for oxygen and non-fuel gases; left-hand for fuel gases. NOTE For those countries using metri
22、c threads according to ISO 261 the dimensions are given in annex A. 5.4 Hose coupling nipple A hose coupling nipple is shown in figure 4 and the dimensions and tolerances of hose coupling nipples are given in table 3. all edges broken Figure 4 Hose coupling nipple Copyright International Organizatio
23、n for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:31:48 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO 3253:1998(E) 5 Table 3 Dimensions and tolerances of hose coupling nipple In
24、ternal diameter of hose 1) Threada2 h14 b3 h14 c2 min. D 2) d5 h12 d6 h12 d8 h12 e h14 r h14 3,2 4 5 G1/84,5246,587633,5 4 5 6,3 8 G1/452,558,311993,54,5 5 6,3 8 10 G3/862,5511,514,512,51246,25 6,3 8 10 G1/263,5613,91815144,57,5 10 12,5 16 G3/483,5618,523,520195,2510 16 20 G1104,572429,7526256,513 1
25、) These values are given as a guide. To every hose diameter correspond the appropriate dimensions of the part to be engaged in the hose. 2) Datum diameter (nominal diameter of contact). The dimensions not given and the profile of the part to be engaged in the hose are left to the discretion of the m
26、anufacturer. The diameter d7 shall be as large as possible to ensure maximum flow capacity. To ensure correct seating between the hose coupling nipple and the threaded union, the diameter d7 shall not exceed d2. As the profile of the hose coupling nipple is left to the manufacturers discretion, the
27、wall between the bore and the smallest diameter of the profile shall have adequate strength. However, the profile and the dimensions should be chosen so as to permit the burst pressure of the hose to be reached when the hose is fixed by a suitable clamp. NOTE For those countries using metric threads
28、 according to ISO 261 the dimensions are given in annex A. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:31:48 MDTNo reproduction or networking permitted without license fro
29、m IHS -,-,- ISO 3253:1998(E) ISO 6 Annex A (informative) Metric threads according to ISO 261 Special national conditions are national characteristics or practices that cannot be changed even over a long period. This annex constitutes a list of modifications to this International Standard which are t
30、o be taken into consideration in those countries in which the relevant special national conditions apply. In this case these provisions are normative, for other countries, they are informative. This annex will expire five years after the date of the publication. Clause 3Delete the first sentence. 5.
31、2Replace table 1 by the following table 1. Table 1 Dimensions and tolerances of threaded unions Thread (d1 P) D 1) a1 2) min. b1 JS15 d2 max. a M12 1 M16 1,5 M20 1,5 6,9 11,2 15,2 8 9 11 1,4 1,5 1 3,5 7 10 60 5 0 1) Datum diameter (nominal diameter of contract). 2) Effective length thread. 5.3Replac
32、e table 2 by the following table 2. Table 2 Dimensions and tolerances of union nut Thread (d1 P) b2 min. c1 JS15 d3 H12 d4 h14 h h14 s h11 M12 1 M16 1,5 M20 1,5 7 8 11 9 11 14 8 12 15 14 19 23 11 13 17 14 19 23 Copyright International Organization for Standardization Provided by IHS under license wi
33、th ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:31:48 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO 3253:1998(E) 7 5.4Replace table 3 by the following table 3. Table 3 Dimensions and tolerances of hose coupling nipple Internal di
34、ameter of hose 1) Thread (d1 P) a2 h14 b3 h14 c2 min. D 2) d5 h12 d6 h12 d8 h12 e h14 r h14 6,3M12 14,5256,910,58834 6,3 10 M16 1,54,52511,21413123,26,5 10 12,5 M20 1,553515,21817,2152,58,8 1) These values are given as a guide. To every hose diameter correspond the appropriate dimensions of the part
35、 to be engaged in the hose. 2) Datum diameter (nominal diameter of contact). Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:31:48 MDTNo reproduction or networking permitted w
36、ithout license from IHS -,-,- ISO 3253:1998(E) ISO ICS 25.160.30 Descriptors: welding, gas welding, gas cutting, brazing and soldering, welding equipment, hoses, pipe fittings, specifications, dimensions. Price based on 7 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 22:31:48 MDTNo reproduction or networking permitted without license from IHS -,-,-