1、INTERNATIONAL STANDARD ISO 15837 First edition 2004-04-01 Reference number ISO 15837:2004(E) ISO 2004 Ships and marine technology Gasketed mechanical couplings for use in piping systems Performance specification Navires et technologie maritime Accouplements mcaniques avec joints pour systmes de tuya
2、uteries Spcification des performancesISO 15837:2004(E) ii ISO 2004 All rights reserved PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licen
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5、o it is found, please inform the Central Secretariat at the address given below. ISO 2004 All rights reserved. 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 pe
6、rmission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in SwitzerlandISO 15837:2004(E) ISO 2004
7、 All rights reserved iii Contents Page 1 Scope 1 2 Terms and definitions 1 3 Classification . 3 4 Ordering information . 4 5 Materials . 4 6 Workmanship, finish and appearance . 4 7 Other requirements . 4 8 Number of tests and retests for qualification testing . 6 9 Specimen preparation and installa
8、tion 6 10 Test methods 7 11 Inspection . 8 12 Product marking 8 13 Packaging . 9 Annex A (normative) Tests to be used in the qualification of GMCs . 11ISO 15837:2004(E) iv ISO 2004 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of nati
9、onal standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical 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. Internat
10、ional organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the ru
11、les given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. 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
12、 least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 15837 was prepared by Technical Committee ISO/TC
13、 8, Ships and marine technology, Subcommittee SC 3, Piping and machinery.INTERNATIONAL STANDARD ISO 15837:2004(E) ISO 2004 All rights reserved 1 Ships and marine technology Gasketed mechanical couplings for use in piping systems Performance specification 1S c o p e This International Standard provid
14、es the performance characteristics and qualification tests required for gasketed mechanical couplings, including grooved-type mechanical couplings for grooved-end pipe, mechanical restraint couplings for plain-end pipe and mechanical compression couplings for plain-end pipe. These couplings are for
15、use at temperatures within the recommended temperature range of their respective gaskets. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 class differentiates joint characteristics such as rigid, flexible, restrained and unrestrained 2.2 fail
16、ure any leakage or joint separation, unless otherwise determined to be due to a pipe or fitting defect 2.3 fitting a device used to change pipe direction, size or adapt to other joining methods NOTE This device is used with pipe or other fittings to create a working system. Shapes such as elbows, te
17、es, crosses, reducers and special shapes are used as needed to fulfil system design specifications. 2.4 flexible characteristic of a joint wherein there is available limited angular and axial pipe movement 2.5 gasketed mechanical coupling GMC a device used to join pipe-to-pipe, pipe-to-fitting, or f
18、itting-to-fitting wherein an elastomeric (gasket) is used to seal the joint NOTE A coupling may or may not provide mechanical restraint of the pipe or fitting. 2.6 working pressure grade joint working pressure as established by tests using representative pipe or tube and the gasketed mechanical coup
19、ling (GMC) 2.7 grooved mechanical coupling (Type 1) a device which consists of two or more housings, closure members such as sets of bolts and nuts or pins, and a pressure-responsive gasketISO 15837:2004(E) 2 ISO 2004 All rights reserved NOTE It is used to mechanically join and seal grooved pipe and
20、/or fittings, forming a joint. See Figure 1. 2.8 grooved mechanical coupling housing structural parts of a grooved mechanical coupling which mechanically fit into pipe or fitting grooves providing mechanical pipe or fitting restraint and enclosure of the gasket 2.9 plain-end mechanical coupling plai
21、n-end GMCs consisting of Type II Classes 1, 2 and 3 2.9.1 Type II Classes 1 and 2 device consisting of gasket(s), housing(s), sleeve(s), end rings, threaded fasteners, pipe or fitting anchoring (gripping) features and seal retainers as applicable NOTE These devices are used to create a seal and rest
22、rain plain-end pipe or fittings. See Figures 2 and 3. 2.9.2 Type II Class 3 device consisting of gasket(s), housing(s), sleeve, end rings and threaded fasteners as applicable NOTE Tightening of the fasteners compresses the gasket(s), creating a seal on the outside of the plain-end pipe. See Figure 4
23、. 2.10 joint interface formed between pipe and pipe, pipe and fitting, or fitting and fitting where a GMC is used to seal this interface within a specified working pressure and, where applicable, provide mechanical holding strength 2.11 joint pressure rating working pressure for the joint on the pip
24、e or fitting material and thickness to be used in the actual piping application 2.12 leakage escape of fluid (gaseous or liquid) from any point of the specimen 2.13 penalty run a penalty run is performed with penalty-run specimens when the original test specimen leaks or separates during testing as
25、a result of any cause which is not related to the design of the GMC being qualified 2.14 penalty-run specimens additional specimen(s) which are tested in the place of the original specimen(s) NOTE These additional specimen(s) are assembled using the same methods, along with additional GMCs of the sa
26、me type, working pressure, class and configuration; and additional pipes or fittings with the same sizes, nominal wall thickness, material and material condition as the original test specimen. 2.15 pressure-responsive gasket gasket design such that application of a pressure load to the gasket enhanc
27、es its sealing capabilities; that is, additional pressure results in additional force between the gasket and the surface which it is sealingISO 15837:2004(E) ISO 2004 All rights reserved 3 2.16 restrained characteristic of the joint wherein thrust loads generated by internal pressure or external mea
28、ns are absorbed within the joint 2.17 rigid characteristic of a joint where there is essentially no available free angular or axial pipe movement 2.18 specimen a prepared assembly consisting of the test joint including a GMC and pipes or fittings NOTE The specimen is placed in a controlled environme
29、nt and tested to determine if the joint performs according to the standards established by the test. 2.19 type differentiation of kind of pipe or fitting which gasketed mechanical couplings are used to join (that is, grooved or plain end) 2.20 unrestrained characteristic of a joint wherein thrust ge
30、nerated by internal pressure or external means is not absorbed by the joint 2.21 size dimensions of the piping system or component, primarily nominal diameter and wall thickness 2.22 life cycle complete series and stages of events in the development and manufacture of a product, from the initial con
31、ceptualization through to production, modifications and maintenance 3 Classification 3.1 Design types Gasketed mechanical couplings (GMCs) are classified into the following design types: Type I, grooved mechanical couplings; Type II, plain-end mechanical couplings. 3.2 Working pressures Gasketed mec
32、hanical couplings (GMCs) are classified into various working pressures, or grades, based on successful completion of testing defined herein. Working pressures range from approximately toand vary by GMC manufacturer. The GMC manufacturer should be consulted for specific working pressures available. 0
33、,7 MPa 30 MPaISO 15837:2004(E) 4 ISO 2004 All rights reserved 3.3 Joint characteristics Gasketed mechanical couplings (GMCs) are classified by the following joint characteristics: Class 1: rigid and restrained; Class 2: flexible and restrained; Class 3: flexible and unrestrained. 4 Ordering informat
34、ion Orders for GMCs (Gasketed Mechanical Couplings) in accordance with this International Standard shall include the following characteristics: quantity (number of gasketed mechanical couplings); size; type (I, II); working pressure (consult GMC manufacturer); class (joint characteristic); housing m
35、aterial and finish; gasket material, including operating temperature limitations; bolt (stud) and nut material and finish; other requirements agreed to between purchaser and GMC manufacturer. 5M a t e r i a l s The materials used for construction of GMCs shall be as agreed upon by the manufacturer a
36、nd the purchaser, provided that such materials have been used to qualify the joints performance in accordance with this International Standard. 6 Workmanship, finish and appearance 6.1 GMC machined surfaces Machined surfaces shall be free from burrs, cracks, laps and seams which would affect the sui
37、tability for the intended service. Machined surface finishes shall be as specified by the manufacturer. 6.2 Unmachined surfaces Unmachined surfaces, such as forging or casting surfaces, shall be free from scale, blisters, fins, folds, seams, laps, segregations and cracks which would affect suitabili
38、ty for the intended service. 7 Other requirements 7.1 Testing requirements GMCs shall be subjected to the tests described in Annex A for the purpose of qualifying the GMC design. These tests shall be repeated when changes are made in the design, material, or manufacturing process that degrade the pe
39、rformance of the GMC. Degradation determination is to be made by the manufacturer or upon agreement between the manufacturer and purchaser.ISO 15837:2004(E) ISO 2004 All rights reserved 5 7.2 Qualification requirements 7.2.1 General GMCs shall be qualified using specimens of the same type, working p
40、ressure and class. Each type, working pressure, and class shall be tested in order to qualify the design. Qualification of the GMC requires successful completion of required testing. Each GMC design is only qualified for use on the pipe or fitting material and wall thickness on which it was tested.
41、7.2.2 Sizing All GMCs tested shall be comprised of an equal number of specimens from the smallest, intermediate, and largest sizes within the size range of the GMC being qualified. Through reasonable interpolations between the GMC sizes tested, other sizes of GMCs within the same type, working press
42、ure and class will be considered qualified if the specimens pass the testing requirements. Extrapolation shall not be used for qualification purposes. 7.3 Qualification test report Upon completion of testing, a qualification test report shall be written and maintained on file during the life cycle o
43、f the design. A copy of this report shall be made available for inspection at the manufacturers facility. Any failure during qualification testing shall be analysed and the failure analysis and corrective action shall be included in the qualification test report. 7.4 Retest A retest as specified in
44、Clause 8 may be allowed when failure of the original joint occurs during qualification testing. When retesting is permitted, the failure analysis and corrective action shall be included in the qualification test report specified in 7.3. 7.5 Test equipment and inspection facilities 7.5.1 General Test
45、 equipment and inspection facilities shall be of sufficient accuracy and quality to permit performance of required inspections and tests. 7.5.2 Calibration system requirements Testing and inspection facilities shall maintain a calibration system for Measuring and Test Equipment in accordance with th
46、e national standards of the country in which the testing is conducted. 7.6 Test conditions Test conditions shall be as follows. Test pressures as specified within each test shall be used. Fluid used in the testing of GMCs shall be water, air or nitrogen (N 2 ), as specified. Unless otherwise specifi
47、ed, GMCs shall be tested within the temperature range stated by the type of test being performed. When no temperature is specified within a test, the test shall be conducted at ambient conditions.ISO 15837:2004(E) 6 ISO 2004 All rights reserved 7.7 Performance requirements Pass criteria for each tes
48、t shall require meeting or exceeding the performance requirements specified in each test. 8 Number of tests and retests for qualification testing 8.1 General Each test shall be performed on specimens as denoted in Table A.1. 8.2 Penalty runs 8.2.1 General In the event of not passing a test, the manu
49、facturer shall proceed with one of the following options. a) If the leak or separation is determined to be design related, the manufacturer shall redesign the GMC and start all tests from the beginning. b) If the leak or separation is determined to be unrelated to the design, the test specimen shall be run again with a replacement test specimen. c) If the leak or separation cannot be shown to be either design related or non-design related, the manufacturer shall test three additional penalty-run sp
