1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58pipe systems for the conveyance of gaseous fuels Metric series Specifications Part 4: System design
2、 and installation guidelinesICS 23.040.20; 23.040.45; 75.200Plastics pipes and fittings Crosslinked polyethylene (PE-X) BRITISH STANDARDBS ISO 14531-4:2006BS ISO 14531-4:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2006 BSI 200
3、6ISBN 0 580 48025 9Cross-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 Catalo
4、gue 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 document co
5、mprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 16, 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 Comment
6、sA list of organizations represented on this subcommittee can be obtained on request to its secretary. 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
7、developments and promulgate them in the UK.National forewordThis British Standard reproduces verbatim ISO 14531-4:2006 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 Su
8、bcommittee PRI/88/2/6, Thermoplastics piping for gas supply, which has the responsibility to: aid enquirers to understand the text;Reference numberISO 14531-4:2006(E)INTERNATIONAL STANDARD ISO14531-4First edition2006-04-01Plastics pipes and fittings Crosslinked polyethylene (PE-X) pipe systems for t
9、he conveyance of gaseous fuels Metric series Specifications Part 4: System design and installation guidelinesTubes et raccords en matires plastiques Systmes de tubes en polythylne rticul (PE-X) pour le transport de combustibles gazeux Srie mtrique Spcifications Partie 4: Lignes directrices pour la c
10、onception et linstallation du systme BS ISO 14531-4:2006ii iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 2 3 Terms and definitions. 2 4 Requirements 5 4.1 Design 5 4.1.1 General. 5 4.1.2 Materials 5 4.1.3 Pressure ranges 5 4.1.4 Minimum/maximum operating temperatur
11、es Tmin/Tmax. 6 4.1.5 Pipes. 6 4.1.6 Pipeline components 8 4.2 Construction 10 4.2.1 Handling, transport and storage . 10 4.2.2 Jointing 10 4.3 Laying 12 4.3.1 General. 12 4.3.2 Open-trench installation 12 4.3.3 Trenchless installation. 13 4.3.4 Stopping the gas flow. 13 5 Tests on site 13 5.1 Gener
12、al. 13 5.2 Pressure test . 13 Annex A (informative) Assessment of lifetime using Miners rule 15 Bibliography . 16 BS ISO 14531-4:2006iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing
13、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 and non-governmental, in liaiso
14、n 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, Part 2. The main task of tec
15、hnical 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 casting a vote. Attention is dra
16、wn 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 14531-4 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of
17、fluids, Subcommittee SC 4, Plastic 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 gaseous fuels Metric series Specifications: Part 1:
18、 Pipes Part 2: Fittings for heat-fusion jointing Part 3: Fittings for mechanical jointing (including PE-X/metal transitions) Part 4: System design and installation guidelines BS ISO 14531-4:2006vIntroduction Further to the publication of International Standards for crosslinked polyethylene (PE-X) ho
19、t-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 systems. The philosophy of ISO 14531 is to provide the
20、 basis for the introduction of PE-X gas pipe systems by the specification of a performance envelope beyond that covered by existing PE standards in order to take its application into regimes of higher operating pressures and extremes of operating temperature. This part of ISO 14531 is therefore one
21、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 for the design, installation and operation
22、 of pipeline systems. BS ISO 14531-4:2006blank1Plastics 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 1 Scope This part of ISO 14531 provides guidance for the design,
23、construction, installation and on-site testing of PE-X pipeline systems. The standard deals with trenchless and open-trench installation methods. This part of ISO 14531, when used in conjunction with the other parts of ISO 14531, provides the basis for the design, manufacture and installation of PE-
24、X piping systems (PE-X pipes, and PE-X and PE heat-fusion fittings and mechanical fittings) for the supply of category D and category E hydrocarbon-based fuels (see ISO 13623) at a) maximum operating pressures (MOPs) up to and including 16 bar 1)and b) a maximum operating temperature of +60 C and c)
25、 a minimum operating temperature of 1) 50 C 2) 35 C 3) 20 C. This part of ISO 14531 provides for the jointing and installation of PE-X and PE heat-fusion fittings and mechanical fittings to PE-X pipes within the temperature range 5 C to +40 C. The jointing of pipes and fittings outside the stated te
26、mperature range should be the subject of consultation between the pipeline operator and the pipe, fitting and equipment manufacturers. Users of this part of ISO 14531 should be aware that useful supplementary information is given in the standards listed in the bibliography. 1) 1 bar = 105N/m2= 100 k
27、Pa. BS ISO 14531-4:20062 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. I
28、SO 4065, Thermoplastic pipes Universal wall thickness table ISO 8085-3, Polyethylene fittings for use with polyethylene 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 hydro
29、static strength of thermoplastics materials in pipe form by extrapolation ISO 10838 (all parts), Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels ISO/TS 10839:2000, Polyethylene pipes and fittings for the supply of gaseous fuels Code of practice for design, handlin
30、g and installation ISO 12162, Thermoplastics materials for pipes and fittings for pressure applications Classification and designation Overall service (design) coefficient ISO 12176-2, Plastics pipes and fittings Equipment for fusion jointing polyethylene systems Part 2: Electrofusion ISO 13623, Pet
31、roleum and natural gas industries Pipeline transportation systems ISO 13760, Plastics pipes for the conveyance of fluids under pressure Miners rule Calculation method for cumulative damage ISO 14531-1:2002, Plastics pipes and fittings Crosslinked polyethylene (PE-X) pipe systems for the conveyance o
32、f gaseous fuels Metric series Specifications Part 1: Pipes ISO 14531-2, Plastics 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 ISO 14531-3, Plastics pipes and fittings Crossli
33、nked polyethylene (PE-X) pipe systems for the conveyance of gaseous fuels Metric series Specifications Part 3: Fittings for mechanical jointing (including PE-X/metal transitions) EN 12007-1, Gas supply systems Pipelines for maximum operating pressure up to and including 16 bar Part 1: General functi
34、onal recommendations EN 12007-2, Gas supply systems Pipelines for maximum operating pressure up to and including 16 bar Part 2: Specific functional recommendations for polyethylene (MOP up to and including 10 bar) 3 Terms and definitions For the purposes of this document, the following terms and def
35、initions apply. 3.1 nominal outside diameter dnnumerical designation of size which is common to all components in a thermoplastics piping system other than flanges and components designated by thread size NOTE 1 It is a convenient round number for reference purposes. BS ISO 14531-4:20063NOTE 2 The n
36、ominal outside diameter expressed in millimetres is the minimum mean outside diameter de,minof pipe produced in accordance with ISO 14531-1. 3.2 nominal wall thickness ennominal designation of wall thickness of a pipe in millimetres in accordance with ISO 4065 3.3 standard dimension ratio SDR ratio
37、of the nominal outside diameter of a pipe to its nominal wall thickness nnSDRde= NOTE The value of the SDR is selected from Table 5 in ISO 14531-1:2002. 3.4 gaseous fuel fuel which is in a gaseous state at a temperature of +15 C and a pressure of 1 bar 3.5 category D gaseous fuel natural gas NOTE Ca
38、tegories of gaseous and liquid fuels are defined in detail in ISO 13623. 3.6 category E gaseous fuel LPG vapour or natural gas conveyed in association with liquid condensate NOTE Categories of gaseous and liquid fuels are defined in detail in ISO 13623. 3.7 design pressure DP pressure on which desig
39、n calculations are based NOTE The design pressure for pipes is designated DPPand for fittings DPF. 3.8 design stress Spipe wall circumferential stress calculated from the design pressure DPPand pipe SDR with a maximum limiting value determined by the quotient of MRS, tand the overall service (design
40、) coefficient C 3.9 maximum operating pressure MOP highest effective pressure, in bars, of the gas in the piping system which is allowed in continuous use NOTE The MOP takes into account the physical and the mechanical characteristics of the components of a piping system. 3.10 temporary operating pr
41、essure TOP maximum pressure that can be generated on a temporary basis under the control of the regulating devices BS ISO 14531-4:20064 3.11 maximum incidental pressure MIP maximum pressure generated for example by surges or failure of pressure control equipment and limited by the activation of over
42、pressure protection devices 3.12 pipeline operator private or public organization authorized to design, construct and/or operate and maintain the gas supply system 3.13 minimum required strength MRS, tvalue of lplfor the pipe material, in megapascals, calculated using ISO 9080 for a specific design
43、temperature and lifetime t and then categorized in accordance with Table 3 NOTE At 20 C and 50 years, MRS, t= MRS. 3.14 overall service (design) coefficient C overall coefficient, with a value greater than 1,0, which takes into consideration service conditions as well as properties of the components
44、 of a piping system other than those represented in the lower prediction limit (3.15) 3.15 lower prediction limit lplquantity, expressed in megapascals, which can be considered as a property of the material and which represents the 97,5 % lower prediction limit of the long-term hydrostatic strength
45、at a temperature of 20 C and a time of 50 years in water 3.16 heat-fusion fitting fitting designed to connect PE-X pipes to form an assembly for subsequent jointing by heat fusion and the creation of an integral pipe-to-fitting connection 3.17 operating-temperature range assumed range of temperature
46、s experienced by a PE-X pipeline at the intended service location, for use in the process of designing the pipeline for operation at MOP 3.18 minimum operating temperature Tminminimum operating temperature (above and/or below ground) expected during the service life of the pipeline 3.19 maximum oper
47、ating temperature Tmaxmaximum operating temperature (above and/or below ground) expected during the service life of the pipeline 3.20 design temperature temperature used to determine MRS, tNOTE See 4.1.5.3. BS ISO 14531-4:200654 Requirements 4.1 Design 4.1.1 General The design pressure (DP) of any P
48、E-X pipeline component shall not be less than the intended maximum operating pressure (MOP) of the pipeline. The DP shall be at least 2,0 bar. The MOP shall be selected from a range of pressures up to a maximum of 16 bar in accordance with the requirements of the pipeline operator. NOTE Requirements
49、 for MOP in the gas industry are not standardized on the basis of PN pressure ratings. An alternative classification system has been adopted in CEN (EN 12007) and is incorporated in Table 1. Operating pressures during transient conditions in excess of MOP are permitted provided they are of limited frequency and duration. Guidance regarding acceptable levels of transient operating pressure conditions is given in 4.
