1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58pipe systems for the conveyance of gaseous fuels Metric series Specifications Part 2: Fittings for
2、heat-fusion jointingICS 75.200; 84.140.30Plastics pipes and fittings Crosslinked polyethylene (PE-X) BRITISH STANDARDBS ISO 14531-2:2004BS ISO 14531-2:2004This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2006 BSI 2006ISBN 0 580 48023 2
3、request to its secretary.Cross-referencesThe British Standards which implement international 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
4、Catalogue or of British Standards Online.This publication does not purport to include all the 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 docum
5、ent comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 29 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 organ
6、izations represented on this subcommittee can be obtained on 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
7、.National forewordThis British Standard reproduces verbatim ISO 14531-2:2004 and implements it as the UK national standard. The UK participation in its preparation was entrusted by Technical Committee PRI/88/2, Plastics piping for pressure applications, to Subcommittee PRI/88/2/6, Thermoplastics pip
8、ing for gas supply, which has the responsibility to: aid enquirers to understand the text;Reference numberISO 14531-2:2004(E)INTERNATIONAL STANDARD ISO14531-2First edition2004-07-01Plastics pipes and fittings Crosslinked polyethylene (PE-X) pipe systems for the conveyance of gaseous fuels Metric ser
9、ies Specifications Part 2: Fittings for heat-fusion jointing Tubes et raccords en matires plastiques Systmes de tubes en polythylne rticul (PE-X) pour le transport de combustibles gazeux Srie mtrique Spcifications Partie 2: Raccords pour assemblage par fusion BS ISO 14531-2:2004ii iiiContents Page F
10、oreword iv Introduction v 1 Scope 1 2 Normative references . 2 3 Terms and definitions. 3 4 Materials. 7 5 Fittings . 9 6 Elastomeric seals 20 7 Marking 20 8 Packaging 21 Annex A (informative) Method of test of the integrity of a fitting after an external blow 22 Annex B (normative) Resistance to ga
11、s constituents 24 Annex C (normative) Constant-strain thermal-cycling test . 25 Annex D (normative) Validation of fitting design pressure DPF27 Bibliography . 29 BS ISO 14531-2:2004iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bo
12、dies (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. International organizatio
13、ns, 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 rules given in the
14、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 least 75 % of th
15、e 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 14531-2 was prepared by Technical Committee ISO/TC 138, Plastics
16、pipes, fittings and valves for the transport of fluids, Subcommittee SC 4, Plastics pipes and fittings for the supply of gaseous fuels. ISO 14531 consists of the following parts, under the general title Plastics pipes and fittings Crosslinked polyethylene (PE-X) pipe systems for the conveyance of ga
17、seous fuels Metric series Specifications: Part 1: Pipes Part 2: Fittings for heat-fusion jointing Part 3: Fittings for mechanical jointing (including PE-X/mechanical transitions) Part 4: System design and installation guidelines BS ISO 14531-2:2004vIntroduction Further to the publication of Internat
18、ional Standards for crosslinked polyethylene (PE-X) hot-water pipes, it has become evident that the properties of PE-X, in particular its high fracture resistance and a recently established socket and saddle fusion jointing capability, render it suitable for use in high-performance gas distribution
19、systems. The philosophy of ISO 14531 is to provide the basis for the introduction of PE-X gas pipe systems by the specification of a performance range beyond that covered by existing PE standards in order to take its application into regimes of higher operating pressures and extremes of operating te
20、mperature. ISO 14531-2 is therefore one part of a four-part system standard covering pipes, fittings for heat-fusion jointing, fittings for mechanical jointing and design and installation guidelines. The content is suitable for use by procurement authorities and distribution engineers responsible fo
21、r the design, installation and operation of pipeline systems. ISO 14531-2 is structured to provide for the supply of heat-fusion fittings with an associated heating method (e.g. electrofusion and induction fusion) that enables pipes and fittings to be pre-assembled in a separate operation prior to t
22、he commencement of the fusion-jointing process. BS ISO 14531-2:2004blank1Plastics pipes and fittings Crosslinked polyethylene (PE-X) pipe systems for the conveyance of gaseous fuels Metric series Specifications Part 2: Fittings for heat-fusion jointing 1 Scope This part of ISO 14531 specifies the ph
23、ysical properties and mechanical performance requirements of crosslinked polyethylene (PE-X) and polyethylene (PE) socket, saddle and spigot fittings for the connection by socket or saddle heat-fusion jointing techniques of PE-X pipes manufactured in accordance with ISO 14531-1. In addition, it lays
24、 down dimensional requirements and specifies some general material properties (including chemical stability) together with a classification scheme for PE-X fitting base materials produced in the form of pipe. This part, when used in conjunction with the other parts of ISO 14531, provides the basis f
25、or the design, manufacture and installation of PE-X piping systems (PE-X pipes, PE-X fusion fittings and mechanical fittings) for the supply of category D and category E gaseous fuels (see ISO 13623) at: a) maximum operating pressures (MOP) up to and including 16 bar1); b) a maximum operating temper
26、ature of + 60 C; c) a minimum operating temperature of i) 50 C ii) 35 C iii) 20 C. Conformity to this part of ISO 14531 of PE fittings for heat-fusion jointing produced in accordance with ISO 8085-3 may be claimed subject to the satisfactory conclusion of the tests listed in 5.11 and an end use rest
27、riction on operating temperature of from 20 C to + 40 C with a maximum operating pressure as determined by ISO 8085-3. NOTE Provision is made in ISO 14531-4 for the use on a restricted temperature basis of ISO 8085 fittings conforming to 5.11 in conjunction with PE-X pipe conforming to ISO 14531-1.
28、The technical file of the fitting manufacturer should also be consulted for relevant supporting information. For installation purposes, this part of ISO 14531 provides for the jointing of heat-fusion fittings to PE-X pipes within the temperature range 5 C to + 40 C. 1) 1 bar = 105N/m2= 100 kPa BS IS
29、O 14531-2:20042 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3, Pre
30、ferred numbers Series of preferred numbers ISO 497, Guide to the choice of series of preferred numbers and of series containing more rounded values of preferred numbers ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determination of the resistance to internal
31、pressure Part 1: General method ISO 3126, Plastics piping systems Plastics components Determination of dimensions ISO 3127, Thermoplastics pipes Determination of resistance to external blows Round-the-clock method ISO 3458, Assembled joints between fittings and polyethylene (PE) pressure pipes Test
32、of leakproofness under internal pressure ISO 4437, Buried polyethylene (PE) pipes for the supply of gaseous fuels Metric series Specifications ISO 6447, Rubber seals Joint rings used for gas supply pipes and fittings Specification for material ISO 8085-3, Polyethylene fittings for use with polyethyl
33、ene pipes for the supply of gaseous fuels Metric series Specifications Part 3: Electrofusion fittings ISO 9080, Plastics piping and ducting systems Determination of the long-term hydrostatic strength of thermoplastics materials in pipe form by extrapolation ISO 9356, Polyolefin pipe assemblies with
34、or without jointed fittings Resistance to internal pressure Test method ISO 9624, Thermoplastics pipes for fluids under pressure Mating dimensions of flange adapters and loose backing flanges ISO 10147, Pipes and fittings made of crosslinked polyethylene (PE-X) Estimation of the degree of crosslinki
35、ng by determination of the gel content ISO/TR 10837, Determination of the thermal stability of polyethylene (PE) for use in gas pipes and fittings ISO 10838-1:2000, Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels Part 1: Metal fittings for pipes of nominal outside
36、 diameter less than or equal to 63 mm ISO/TS 10839, Polyethylene pipes and fittings for the supply of gaseous fuels Code of practice for design, handling and installation ISO 11413, Plastics pipes and fittings Preparation of test piece assemblies between a polyethylene (PE) pipe and an electrofusion
37、 fitting ISO 120922), Fittings, valves and other piping system components made of unplasticized poly(vinyl chloride) (PVC-U), chlorinated poly(vinyl chloride) (PVC-C), acrylonitrile-butadiene-styrene (ABS) and acrylonitrile-styrene-acrylester (ASA) for pipes under pressure Resistance to internal pre
38、ssure Test method 2) Under revision as ISO 1167-3. BS ISO 14531-2:20043ISO 12162, Thermoplastics materials for pipes and fittings for pressure applications Classification and designation Overall service (design) coefficient ISO 13479, Polyolefin pipes for the conveyance of fluids Determination of re
39、sistance to crack propagation Test method for slow crack growth on notched pipes (notch test) ISO 13623, Petroleum and natural gas industries Pipeline transportation systems ISO 13954, Plastics pipes and fittings Peel decohesion test for polyethylene (PE) electrofusion assemblies of nominal outside
40、diameter greater than or equal to 90 mm ISO 13955, Plastics pipes and fittings Crushing decohesion test for polyethylene (PE) electrofusion assemblies ISO 13957, Plastics pipes and fittings Polyethylene (PE) tapping tees Test method for impact resistance ISO 14531-1, Plastics pipes and fittings Cros
41、slinked polyethylene (PE-X) pipe systems for the conveyance of gaseous fuels Metric series Specifications Part 1: Pipes ISO 14531-3, Plastics pipes and fittings Crosslinked polyethylene (PE-X) pipe systems for the conveyance of gaseous fuels Metric series Specifications Part 3: Fittings for mechanic
42、al jointing (including PE-X/metal transitions) ISO 14531-4, Plastics pipes and fittings Crosslinked polyethylene (PE-X) pipe systems for the conveyance of gaseous fuels Metric series Specifications Part 4: System design and installation guidelines ISO 18553, Method for the assessment of the degree o
43、f pigment or carbon black dispersion in polyolefin pipes, fittings and compounds IEC 60529, Degrees of protection provided by enclosures (IP Code) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 Fitting types 3.1.1 socket fitting fitting with
44、 one or more cylindrical sockets into which pipes or fitting spigots can be inserted to form an assembly for subsequent jointing by heat fusion and the creation of an integral pipe/fitting connection 3.1.2 spigot fitting fitting with one or more tubular ends capable of insertion into a socket fittin
45、g to form an assembly for subsequent jointing by heat fusion and the creation of an integral pipe-to-fitting connection 3.1.3 saddle fitting fitting for placement on or around the outer surface of a pipe to form a saddle assembly for subsequent jointing by heat fusion and the creation of an integral
46、 pipe-to-fitting connection 3.1.4 tapping tee saddle fitting, with various outlet configurations, containing an intrinsic tool designed to perforate the wall of the pipe whilst the pipe is under internal pressure BS ISO 14531-2:20044 3.1.5 branch saddle saddle fitting, with various outlet configurat
47、ions, with provision made for the location of a separate tool designed to perforate the wall of the pipe whilst the pipe is under internal pressure or in a non-pressurised state 3.2 Terms relating to the geometry 3.2.1 nominal outside diameter dnnumerical designation of the pipe size which is common
48、 to all components in a thermoplastics piping system, other than flanges and components designated by thread size NOTE It is a convenient round number used for reference purposes. 3.2.2 mean outside diameter depipe quotient of the outer circumference of the pipe measured at any cross-section and 3),
49、 rounded up to the nearest 0,1 mm 3.2.3 mean outside diameter D1,spspigot fitting quotient of the outer circumference of a tubular spigot, measured in any radial plane over a distance extending up to L1,spfrom its leading face, and 4), rounded up to the nearest 0,1 mm 3.2.4 minimum mean outside diameter de,minminimum value of the mean outside diameter of a pipe, specified for a give
