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1、STD*ISO 47-ENGL 1974 4853703 0702223 940 = INTERNATIONAL STANDARD IS0 49:1994 TECHNICAL CORRIGENDUM 1 Published 1997-02-15 I INTERNATIONAL ORGANIZATION FOR STANDARDIZATION M E X Q l Y H A P O n H A OPiAHM3AUMR no tTAH!JAITM3AUMM ORGANISATION INTERNATIONALE DE NORMALISATION Malleable cast iron fittin
2、gs threaded to IS0 7-1 TECHNICAL CORRIGENDUM 1 Raccords en fonte mallable filets conformment VISO 7- 1 RECTIFICATIF TECHNIQUE I Technical Corrigendum 1 to International Standard IS0 49:1994 was prepared by Technical Committee ISO/TC 5, Ferrous metal pipes and metallic fittings, Subcommittee SC 5, Th
3、readed or plain end butt-welding fittings, threads, gauging of threads. This material is reproduced from IS0 documents under International Organization for Standardization (ISO) Copyright License number IHSIICCI1996. Not for resale. No part of these IS0 documents may be reproduced in any form, elect
4、ronic retrieval system or otherwise, except as allowed in the copyright law of the country of use, or with the prior mitten consent of IS0 (Case postale 56,121 1 Geneva 20, Switzerland, Fax +41 22 734 10 79), IHS or the IS0 Licensors members. Page 6 Subclause 5.3 Replace the first line with the foll
5、owing: “The surfaces of the finished fittings shall be free of polycyclic aromatic hydrocarbons.” Page 71 Subclause 11.7 Replace this subclause with the following: “1 1.7 Analysis for polycyclic aromatic hydrocarbons Verification of the absence of polycyclic aromatic hydrocarbons (see 5.3) shall be
6、performed by means of gas or thin-layer chromatography or other equivalent methods.” ICs 23.040.40 Ref. No. IC0 49:1994/Cor.l:1997(E) Descriptors: cast iron products, malleable cast iron, pipe fittings, threaded parts, classification, specifications, material specifications, manufacturing requiremen
7、ts, dimensions, tests, designation, marking, symbols. O IS0 1997 Printed in Switzerland 4851903 Ob29240 208 c INTERNATIONAL STANDARD IS0 Second edition 1994-1 2-1 5 Malleable cast iron fittings threaded to IS0 7-1 Raccords en fonte mallable filets conformment IISO 7- 1 Reference number IS0 49:1994E)
8、 COPYRIGHT International Organization for Standardization Licensed by Information Handling Services COPYRIGHT International Organization for Standardization Licensed by Information Handling Services rn 4851703 Ob29241 144 rn Foreword IS0 (the International Organization for Standardization) is a worl
9、dwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on
10、that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted
11、 by the technical committees are circulated to the member bodies for voting. Publication as an international Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 49 was prepared by Technical Committee ISOflC 5, Ferrous metal pipes and metallic f
12、ittings, Subcommittee SC 5, Threaded or plain end butt-welding fittings, threads, gauging of threads. This second edition cancels and replaces the first edition (IS0 49:1983), which has been technicallly revised. Annex A of this International Standard is for information only. Q IS0 1994 All rights r
13、eserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, includrng photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56
14、 CH-1 21 1 Genve 20 Switzerland Printed in Switzerland II COPYRIGHT International Organization for Standardization Licensed by Information Handling Services COPYRIGHT International Organization for Standardization Licensed by Information Handling Services 4853903 Ob29242 O80 INTERNATIONAL STANDARD 0
15、 IS0 IS0 49:1994(E) Malleable cast iron fittings threaded to IS0 7-1 1 Scope This International Standard specifies requirements for the design and performance of malleable cast iron threaded pipe fittings These fittings are for general purposes for the transmission of fluids and gases up to the limi
16、ts of pressure and temperature specified in this International Standard. They are intended for the connection of elements threaded in accordance with IS0 7-1, sizes 1/8 to 6. For use in conditions outside the pressure and temperature limits specified, consult the fitting manufacturer. 2 Normative re
17、ferences The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International
18、 Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 7-1 :I 994, Pipe threads where pressure-tight joints are made on the threads - Part
19、?: Dimensions, tolerances and designation. IS0 228-1 : 1994, Pipe threads where pressure-tight joints are not made on the threads - Part 7 : Dimensions, tolerances and designation. IS0 28540:-l), Sampling procedures for inspection by attributes - Part O: Introduction to the IS0 2859 attribute sampli
20、ng system. IS0 2859-1 : 1989, Sampling procedures for inspection by attributes - Part 7 : Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection. IS0 28592:1985, Sampling procedures for inspection by attributes - Part 2: Sampling plans indexed by limiting quality (LO) for
21、 isolated lot inspection. IS0 2859-3: 1991, Sampling procedures for inspection by attributes - Part 3: Skip-lot sampling procedures. IS0 5922:1981, Malleable cast iron. IS0 6708:-*), Pipe components - Definition of nominal size (DNI. 1) To be published. (Revision of IS0 2859:1974) 2) To be published
22、. (Revision of IS0 6708:1980) 1 COPYRIGHT International Organization for Standardization Licensed by Information Handling Services COPYRIGHT International Organization for Standardization Licensed by Information Handling Services 4851903 Ob29243 T17 M IS0 49:1994(EI i Q IS0 3 Definitions For the pur
23、poses of this International Standard, the following definitions apply. 3.1 fitting: Connecting piece, of one or more parts. 3.2 jointing thread: Thread complying with IS0 7-1. 3.3 fastening thread: Thread complying with IS0 228-1. 3.4 fitting size; designation of thread size: Size designation of the
24、 threads of the threaded outlets as derived from IS0 7-1 (see also clause 13). 3.5 nominal size; DN: For definition see IS0 6708. NOTES 1 Nominal size IS designated by the letters DN followed by the appropriate number. 2 The relationship between fitting size and nominal size (DN) is given in clause
25、15 for guidance only. 3 Nominal size (DN) should not be used for the designation of fitting size. 3.6 reinforcement: Additional material on the outside diameter of an internally threaded fitting in the form of a band or bead (see figure 1). a) Band b) Bead Figure 1 - Forms of reinforcements 3.7 rib:
26、 Local and axially aligned additional material on the outside or inside of a fitting for assistance in assembly or manufacturing. 3.8 outlet: Internally or externally threaded end of a fitting, which connects with a tube, fitting or other component threaded in accordance with IS0 7-1. 3.9 run: Two p
27、rincipal axially aligned outlets of a tee or cross. 3.10 branch(es): Side outlet(s) of a tee or cross. 3.11 chamfer: Conical portion at the entrance of a thread removed to assist assembly and prevent damage to the start of the thread. 3.12 face-to-face dimension: Distance between the two parallel fa
28、ces of axially aligned outlets of a fitting. 3.13 face-to-centre dimension: Distance between the face of an outlet and the central axis of an angularly disposed outlet. 3.14 laying length: Average distance from the assembled pipe end to the axis of the fitting, or between the ends of two assembled p
29、ipes (see also 7.2). 2 COPYRIGHT International Organization for Standardization Licensed by Information Handling Services COPYRIGHT International Organization for Standardization Licensed by Information Handling Services Q IS0 D I Pli? Clause 23 Y851903 06292Y5 8 T m D4 Clause 23 IS0 49:1994(E) 4 Ty
30、pes of fitting Table 1 provides an index to fitting types, patterns and symbols. The symbols relate to the identification of fittings and may be used for designation (see 13.1 1. Table 1 - Index of fitting types and symbols, with corresponding clauses and patterns A l Clause 17 Clause 18 Symbol AV45
31、 Clause 19 A4 Clause 17 Clause 18 B I A4/45“ Clause 19 Clause 17 Clause 20 Clause 20 Clause 21 Clause 21 C I I . E - Clause 17 Clause22 I E I I E2 Clause 23 Clause 24 Clause 24 Clause24 I Clause23 Clause 25 3 COPYRIGHT International Organization for Standardization Licensed by Information Handling S
32、ervices COPYRIGHT International Organization for Standardization Licensed by Information Handling Services 4853703 Ob29244 953 L ISO 49:1994(E) Table 1 - Index of fitting types and symbols, with corresponding clauses and patterns (continued) Q IS0 G I I 61/45“ I 64 Clause26 I Clause27 I Clause26 M2
33、M2 M2 R-L =TJ Clause 28 Clause 28 N4 Clause 30 Clause 30 Clause 30 p4 I Clause32 I Symbol 64/45 68 Clause27 I Clause26 M4 Clause 29 Clause 29 N8 N8 N8 R-L Clause 31 Clause 31 T I Clause 33 u1 I u2 T9 I TI1 I u11 I u12 I 4 COPYRIGHT International Organization for Standardization Licensed by Informati
34、on Handling Services COPYRIGHT International Organization for Standardization Licensed by Information Handling Services Q IS0 m 4853903 0629246 72b m IS0 49:1994(E) Table 1 - Index of fitting types and symbols, with corresponding clauses and patterns (concluded) UA Union elbows Za Side outlet elbows
35、 and tees UA1 Clause 35 Zal Clause 17 UA2 I Clause 35 Za2 Clause 17 Symbol UA11 1 UA12 I I 5 Materials 5.1 Fitting material 5.1.1 Malleable cast iron The material used shall be malleable cast iron (except see 5.1.2) meeting the requirements of IS0 5922. The grade of material used shall be selected f
36、rom the following grades depending on the design chosen (see 6.1): Grade W400-O5 or W350-O4 for whiteheart fittings; Grade W350-1 O or B300-06 for blackheart fittings. 5.1.2 Other ferrous materials Any other ferrous materials which give mechanical properties at least equivalent to those grades of ma
37、lleable cast iron specified in 5.1.1 are allowed for fittings not larger than size 3/8 of the straight type, but excluding unions. 5.2 Hot-dip zinc coating Where a protection by zinc coating is required, the zinc coating shall be applied by the hot-dip process and shall meet the following requiremen
38、ts. NOTE 4 For fittings supplied in other ferrous materials (see 5.1.2). an alternative to zinc coating may be provided by agreement with the purchaser. 5.2.1 Chemical composition of the zinc coating The percentage by mass of the trace elements in the finished zinc coating shall not exceed the follo
39、wing maximum values: aluminium antimony arsenic bismuth cadmium copper lead tin 0,l % 0,Ol % 0.02 Y o 0,07 % 0,Ol % 0,l % 1.6 %; in certain cases 1,8 % 0,l % 5 COPYRIGHT International Organization for Standardization Licensed by Information Handling Services COPYRIGHT International Organization for
40、Standardization Licensed by Information Handling Services = 4853903 0629247 662 = Design symbol A IS0 49:1994(E) Thread type Material external internal grade R RP W400-O5 or B350-1 O I 0 IS0 B C 5.2.2 Coating mass per unit surface area The areic mass of the zinc coating shall be not less than 500 g/
41、m2, as an average of five fittings. This corresponds to an average layer thickness of 70 pm. The areic mass shall be not less than 450 g/m2 (63 pm) on each individual sample. R RP W350-O4 or 8300-06 R Rc W400-O5 or 8350-1 O The average layer thickness S I in micrometres, of the zinc coating may be c
42、alculated by using the approximation: - mA .F = - 7,2 wnere nlA is the areic mass of the zinc coating, in grams per square metre. 5.2.3 Surface condition of the zinc coating The zinc coating on the internal surface of the fitting shall be continuous, with the exception of machined black surfaces. In
43、 the special case of larger material cross-sections, the iron-zinc alloy phases may grow through. The internal zinc coating shall be free from zinc blisters, zinc burrs and nonmetallic remainders. 5.3 Despatch conditions of finished fittings The surfaces of the finished fittings shall be free of aro
44、matic hydrocarbons. 6 Design 6.1 Fittings shall be identified by design symbols according to the material selected (see 5.1.1 1 and the choice of thread (see 8.1 .l) as given in table 2. I D I R I Rc I W350-04orB300-06 I NOTE - For fittings having only external threads, the design symbol shall be th
45、e same as that specified for fittings manufactured with internal thread and in the same material grade. 6.2 The types and sizes dimensionally standardized are given in clauses 17 to 35. The drawings are diagrammatic, without prejudice to the manufactured form. 6.3 Fittings shall be reinforced at the
46、 internally-threaded ends by a band or bead, except where they are polygonal in shape to allow for spanner flats, or where fittings have side outlets (types Zal and Za2). 6.4 Ribs may be incorporated at the manufacturers discretion. Ribs should not project higher than the reinforcing bead or band. 6
47、.5 Backnuts may be plain or recessed and one face may be machined. 6.6 Clauses 34 and 35 show two typical types of seats of unions and their designations. Other types of seat design and seat material shall be considered as complying with this International Standard provided the dimensions in clauses
48、 34 and 35 and other requirements of this International Standard are observed. Such unions do not have a formal designation. 6 COPYRIGHT International Organization for Standardization Licensed by Information Handling Services COPYRIGHT International Organization for Standardization Licensed by Infor
49、mation Handling Services Q IS0 = 4851903 0629248 5T9 IS0 49:1994(E) 7 Dimensions and tolerances 7.1 Fittings shall have the appropriate dimensions (see clauses 17 to 35). Where maximum or minimum dimensions are not specified, the tolerances for face-to-face and face-to-centre dimensions shall be as given in table 3. NOTE 5 The face-to-face and face-tocentre dimensions of unions may not always comply with the tolerances given, due to the compound effect of piece tolerances and design upon the final assembly. Table 3 -Tolerance on length Dimension s