1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58for use in piping systems Performance specificationICS 47.020.30Ships and marine technology Gaskete
2、d mechanical couplings BRITISH STANDARDBS ISO 15837:2004BS ISO 15837:2004This British Standard was published under the authority of the Standards Policy and Strategy Committee on 20 January 2006 BSI 20 January 2006ISBN 0 580 46237 4Cross-referencesThe British Standards which implement international
3、publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the
4、 necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages
5、 1 to 20, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizations represented on this subcommittee can be obtained on request to its secretar
6、y. present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.National forewordThis British Standard reproduces verbati
7、m ISO 15837:2004 and implements it as the UK national standard.The UK participation in its preparation was entrusted by Technical Committee SME/32, Ships and marine technology, to Subcommittee SME/32/3, Piping and machinery, which has the responsibility to: aid enquirers to understand the text;INTER
8、NATIONALSTANDARDISO15837First edition2004-04-01Reference numberISO 15837:2004(E)Ships and marine technology Gasketed mechanical couplings for use in piping systems Performance specificationNavires et technologie maritime Accouplements mcaniques avec joints pour systmes de tuyauteries Spcification de
9、s performancesBS ISO 15837:2004iiiiiContents Page1 Scope 12 Terms and definitions 13 Classification . 34 Ordering information . 45 Materials . 46 Workmanship, finish and appearance . 47 Other requirements . 48 Number of tests and retests for qualification testing . 69 Specimen preparation and instal
10、lation 610 Test methods 711 Inspection . 812 Product marking 813 Packaging . 9Annex A (normative) Tests to be used in the qualification of GMCs . 11BS ISO 15837:2004iv ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member
11、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. International organizations, governmental
12、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 rules given in the ISO/IEC Directives
13、, 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 least 75 % of the member bodies cas
14、ting 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 8, Ships and marine technology, Subco
15、mmittee SC 3, Piping and machinery.BS ISO 15837:20041Ships and marine technology Gasketed mechanical couplings for use in piping systems Performance specification1ScopeThis International Standard provides the performance characteristics and qualification tests required forgasketed mechanical couplin
16、gs, 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 use at temperatures within the recommended temperature range of their respectivegaskets.2 Terms and d
17、efinitionsFor the purposes of this document, the following terms and definitions apply.2.1 classdifferentiates joint characteristics such as rigid, flexible, restrained and unrestrained2.2 failureany leakage or joint separation, unless otherwise determined to be due to a pipe or fitting defect2.3 fi
18、ttinga device used to change pipe direction, size or adapt to other joining methodsNOTE This device is used with pipe or other fittings to create a working system. Shapes such as elbows, tees, crosses,reducers and special shapes are used as needed to fulfil system design specifications.2.4 flexiblec
19、haracteristic of a joint wherein there is available limited angular and axial pipe movement2.5 gasketed mechanical couplingGMCa device used to join pipe-to-pipe, pipe-to-fitting, or fitting-to-fitting wherein an elastomeric (gasket) is used toseal the jointNOTE A coupling may or may not provide mech
20、anical restraint of the pipe or fitting.2.6 working pressure gradejoint working pressure as established by tests using representative pipe or tube and the gasketed mechanicalcoupling (GMC)2.7 grooved mechanical coupling (Type 1)a device which consists of two or more housings, closure members such as
21、 sets of bolts and nuts or pins, anda pressure-responsive gasketBS ISO 15837:20042NOTE It is used to mechanically join and seal grooved pipe and/or fittings, forming a joint.See Figure 1.2.8 grooved mechanical coupling housingstructural parts of a grooved mechanical coupling which mechanically fit i
22、nto pipe or fitting grooves providingmechanical pipe or fitting restraint and enclosure of the gasket2.9 plain-end mechanical couplingplain-end GMCs consisting of Type II Classes 1, 2 and 32.9.1 Type II Classes 1 and 2device consisting of gasket(s), housing(s), sleeve(s), end rings, threaded fastene
23、rs, pipe or fitting anchoring(gripping) features and seal retainers as applicableNOTE These devices are used to create a seal and restrain plain-end pipe or fittings. See Figures 2 and 3.2.9.2 Type II Class 3device consisting of gasket(s), housing(s), sleeve, end rings and threaded fasteners as appl
24、icableNOTE Tightening of the fasteners compresses the gasket(s), creating a seal on the outside of the plain-end pipe. SeeFigure 4.2.10 jointinterface formed between pipe and pipe, pipe and fitting, or fitting and fitting where a GMC is used to seal thisinterface within a specified working pressure
25、and, where applicable, provide mechanical holding strength2.11 joint pressure ratingworking pressure for the joint on the pipe or fitting material and thickness to be used in the actual pipingapplication2.12 leakageescape of fluid (gaseous or liquid) from any point of the specimen2.13 penalty runa p
26、enalty run is performed with penalty-run specimens when the original test specimen leaks or separatesduring testing as a result of any cause which is not related to the design of the GMC being qualified2.14 penalty-run specimensadditional specimen(s) which are tested in the place of the original spe
27、cimen(s)NOTE These additional specimen(s) are assembled using the same methods, along with additional GMCs of the sametype, 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 spe
28、cimen.2.15 pressure-responsive gasketgasket design such that application of a pressure load to the gasket enhances its sealing capabilities; that is,additional pressure results in additional force between the gasket and the surface which it is sealingBS ISO 15837:200432.16 restrained characteristic
29、of the joint wherein thrust loads generated by internal pressure or external means are absorbed within the joint2.17 rigid characteristic of a joint where there is essentially no available free angular or axial pipe movement2.18 specimen a prepared assembly consisting of the test joint including a G
30、MC and pipes or fittingsNOTE The specimen is placed in a controlled environment 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
31、 or plain end)2.20 unrestrained characteristic of a joint wherein thrust generated by internal pressure or external means is not absorbed by the joint2.21 size dimensions of the piping system or component, primarily nominal diameter and wall thickness2.22 life cycle complete series and stages of eve
32、nts in the development and manufacture of a product, from the initial conceptualization through to production, modifications and maintenance3 Classification3.1 Design typesGasketed mechanical couplings (GMCs) are classified into the following design types: Type I, grooved mechanical couplings; Type
33、II, plain-end mechanical couplings.3.2 Working pressuresGasketed mechanical 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 manufact
34、urer should be consulted for specific working pressures available.0,7 MPa30 MPaBS ISO 15837:200443.3 Joint characteristicsGasketed mechanical couplings (GMCs) are classified by the following joint characteristics: Class 1: rigid and restrained; Class 2: flexible and restrained; Class 3: flexible and
35、 unrestrained.4 Ordering informationOrders for GMCs (Gasketed Mechanical Couplings) in accordance with this International Standard shall includethe following characteristics: quantity (number of gasketed mechanical couplings); size; type (I, II); working pressure (consult GMC manufacturer); class (j
36、oint characteristic); housing material and finish; gasket material, including operating temperature limitations; bolt (stud) and nut material and finish; other requirements agreed to between purchaser and GMC manufacturer.5MaterialsThe materials used for construction of GMCs shall be as agreed upon
37、by the manufacturer and the purchaser,provided that such materials have been used to qualify the joints performance in accordance with thisInternational Standard.6 Workmanship, finish and appearance6.1 GMC machined surfacesMachined surfaces shall be free from burrs, cracks, laps and seams which woul
38、d affect the suitability for theintended service. Machined surface finishes shall be as specified by the manufacturer.6.2 Unmachined surfacesUnmachined surfaces, such as forging or casting surfaces, shall be free from scale, blisters, fins, folds, seams,laps, segregations and cracks which would affe
39、ct suitability for the intended service.7 Other requirements7.1 Testing requirementsGMCs shall be subjected to the tests described in Annex A for the purpose of qualifying the GMC design. Thesetests shall be repeated when changes are made in the design, material, or manufacturing process that degrad
40、ethe performance of the GMC. Degradation determination is to be made by the manufacturer or upon agreementbetween the manufacturer and purchaser.BS ISO 15837:200457.2 Qualification requirements7.2.1 GeneralGMCs shall be qualified using specimens of the same type, working pressure and class. Each typ
41、e, workingpressure, and class shall be tested in order to qualify the design. Qualification of the GMC requires successfulcompletion of required testing. Each GMC design is only qualified for use on the pipe or fitting material and wallthickness on which it was tested.7.2.2 SizingAll GMCs tested sha
42、ll be comprised of an equal number of specimens from the smallest, intermediate, andlargest sizes within the size range of the GMC being qualified. Through reasonable interpolations between theGMC sizes tested, other sizes of GMCs within the same type, working pressure and class will be consideredqu
43、alified if the specimens pass the testing requirements. Extrapolation shall not be used for qualificationpurposes.7.3 Qualification test reportUpon completion of testing, a qualification test report shall be written and maintained on file during the life cycleof the design. A copy of this report sha
44、ll be made available for inspection at the manufacturers facility. Anyfailure during qualification testing shall be analysed and the failure analysis and corrective action shall beincluded in the qualification test report.7.4 RetestA retest as specified in Clause 8 may be allowed when failure of the
45、 original joint occurs during qualificationtesting. When retesting is permitted, the failure analysis and corrective action shall be included in thequalification test report specified in 7.3.7.5 Test equipment and inspection facilities7.5.1 GeneralTest equipment and inspection facilities shall be of
46、 sufficient accuracy and quality to permit performance ofrequired inspections and tests.7.5.2 Calibration system requirementsTesting and inspection facilities shall maintain a calibration system for Measuring and Test Equipment inaccordance with the national standards of the country in which the tes
47、ting is conducted.7.6 Test conditionsTest 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 (N2), as specified. Unless otherwise specified, GMCs shall be tested within the temperature range st
48、ated by the type of testbeing performed. When no temperature is specified within a test, the test shall be conducted at ambientconditions.BS ISO 15837:200467.7 Performance requirementsPass criteria for each test shall require meeting or exceeding the performance requirements specified in eachtest.8
49、Number of tests and retests for qualification testing8.1 GeneralEach test shall be performed on specimens as denoted in Table A.1.8.2 Penalty runs8.2.1 GeneralIn the event of not passing a test, the manufacturer 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 andstart 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
