1、BS ISO22621-6:2010ICS 75.200; 83.140.30NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPlastics piping systemsfor the supply ofgaseous fuels formaximum operatingpressures up to andincluding 2 MPa (20bar) Polyamide (PA)Part 6: Code of practice for design,handling
2、 and installationThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 31 May2010. BSI 2010ISBN 978 0 580 62881 8Amendments/corrigenda issued since publicationDate CommentsBS ISO 22621-6:2010National forewordThis British Standard is the UK implementati
3、on of ISO 22621-6:2010.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/88/2, Plastics piping for pressure applications.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the
4、 necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS ISO 22621-6:2010Reference numberISO 22621-6:2010(E)ISO 2010INTERNATIONAL STANDARD ISO22621-6First edition2010-04-15Plastics piping
5、systems for the supply of gaseous fuels for maximum operating pressures up to and including 2 MPa (20 bar) Polyamide (PA) Part 6: Code of practice for design, handling and installation Systmes de canalisations en matires plastiques pour la distribution de combustibles gazeux pour des pressions maxim
6、ales de service infrieures ou gales 2 MPa (20 bar) Polyamide (PA) Partie 6: Code de pratique pour la conception, la manutention et linstallation BS ISO 22621-6:2010ISO 22621-6:2010(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file m
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9、he file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2010 All rights reserved. Unless otherwise specified, no part of this publication may be
10、reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission 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
11、 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2010 All rights reservedBS ISO 22621-6:2010ISO 22621-6:2010(E) ISO 2010 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Terms and definitions
12、 .2 4 Symbols and abbreviated terms 3 5 Design.3 5.1 General .3 5.2 Materials, components and jointing equipment.3 5.3 Maximum operating pressure 4 5.4 Assembly techniques4 5.5 Squeeze-off properties4 6 Installation4 6.1 Jointing procedure 4 6.2 Training.5 6.3 Heated-tool fusion jointing.5 6.4 Elect
13、rofusion jointing11 6.5 Laying .14 7 Storage, handling and transport16 7.1 General .16 7.2 Storage .16 7.3 Handling .18 7.4 Transport18 8 Quality control .18 8.1 General .18 8.2 Inspection prior to laying18 8.3 Inspection during laying.19 Annex A (informative) Derating coefficients for operating tem
14、peratures.21 BS ISO 22621-6:2010ISO 22621-6:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out throu
15、gh 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 liaison with ISO, also take part in the work. ISO collabora
16、tes 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 technical committees is to prepare International Standar
17、ds. 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 drawn to the possibility that some of the elements of th
18、is document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 22621-6 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee SC 4, Plastics pipes and fitting
19、s for the supply of gaseous fuels. ISO 22621 consists of the following parts, under the general title Plastics piping systems for the supply of gaseous fuels for maximum operating pressures up to and including 2 MPa (20 bar) Polyamide (PA): Part 1: General Part 2: Pipes Part 3: Fittings Part 5: Fitn
20、ess for purpose of the system Part 6: Code of practice for design, handling and installation BS ISO 22621-6:2010ISO 22621-6:2010(E) ISO 2010 All rights reserved vIntroduction This part of ISO 22621 addresses the common basic principles for gas supply systems. More detailed national standards or code
21、s of practice might exist in the ISO member countries. This part of ISO 22621 is intended to be applied in association with those national standards or codes of practice related to the above-mentioned basic principles. BS ISO 22621-6:2010BS ISO 22621-6:2010INTERNATIONAL STANDARD ISO 22621-6:2010(E)
22、ISO 2010 All rights reserved 1Plastics piping systems for the supply of gaseous fuels for maximum operating pressures up to and including 2 MPa (20 bar) Polyamide (PA) Part 6: Code of practice for design, handling and installation 1 Scope This part of ISO 22621 specifies a code of practice dealing w
23、ith polyamide (PA) piping systems, intended to be buried outside buildings and used for the supply of gaseous fuels. It is applicable to mains and service lines, the components of which are prepared for jointing by scraping and/or machining, and gives instructions for the design, storage, handling,
24、transportation, laying conditions and fusion quality control of PA pipes and fittings up to and including 250 mm outside diameter, as well as subsequent joint testing, backfilling, pipe system testing, commissioning and decommissioning. The jointing methods covered by this part of ISO 22621 are butt
25、 fusion jointing and electrofusion jointing. No special precautions are necessary for areas exposed to the influence of mining and earthquakes other than those precautions mentioned in this part of ISO 22621. It is the responsibility of users of this part of ISO 22621 to take existing and new nation
26、al regulations into account. 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) applie
27、s. ISO 12162, Thermoplastics materials for pipes and fittings for pressure applications Classification, designation and design coefficient ISO 12176-1, Plastics pipes and fittings Equipment for fusion jointing polyethylene systems Part 1: Butt fusion ISO 12176-2, Plastics pipes and fittings Equipmen
28、t for fusion jointing polyethylene systems Part 2: Electrofusion ISO 12176-3, Plastics pipes and fittings Equipment for fusion jointing polyethylene systems Part 3: Operators badge EN 12327, Gas supply systems Pressure testing, commissioning and decommissioning procedures Functional requirements BS
29、ISO 22621-6:2010ISO 22621-6:2010(E) 2 ISO 2010 All rights reservedISO 22621-1, Plastics piping systems for the supply of gaseous fuels for maximum operating pressures up to and including 2 MPa (20 bar) Polyamide (PA) Part 1: General ISO 22621-2, Plastics piping systems for the supply of gaseous fuel
30、s for maximum operating pressures up to and including 2 MPa (20 bar) Polyamide (PA) Part 2: Pipes ISO 22621-3, Plastics piping systems for the supply of gaseous fuels for maximum operating pressures up to and including 2 MPa (20 bar) Polyamide (PA) Part 3: Fittings ISO 22621-5, Plastics piping syste
31、ms for the supply of gaseous fuels for maximum operating pressures up to and including 2 MPa (20 bar) Polyamide (PA) Part 5: Fitness for purpose of the system 3 Terms and definitions For the purposes of this document, the terms, definitions, symbols and abbreviated terms given in ISO 22621-1 and ISO
32、 22621-5 and the following apply. 3.1 butt fusion machine pressure pressure indicated on the manometer or on a pressure display on a butt fusion machine, giving an indication of the interface force applied to the pipe or fitting ends 3.2 clearance shortest distance between the outer limits of two ob
33、jects 3.3 drag resistance frictional resistance due to the weight of the length of pipe fixed in the movable clamp at the point at which movement of the movable clamp is initiated (peak drag), or the friction occurring during movement (dynamic drag) 3.4 electrofusion control box unit implementing th
34、e output fusion parameters of voltage or current and time or energy to execute the fusion cycle, as specified by the electrofusion fitting manufacturer 3.5 frictional losses in the butt fusion machine force necessary to overcome friction in the whole mechanism of a butt fusion machine 3.6 interface
35、force force between the fusion surfaces of the pipe(s) and/or fitting(s) during the fusion cycle, as specified in the fusion diagram 3.7 operator person authorized to build PA systems from pipes or fittings, based on a written procedure agreed on by the pipeline operator 3.8 overall service (design)
36、 coefficient C overall coefficient, with a value greater than 1, which takes into consideration service conditions as well as properties of the components of a piping system BS ISO 22621-6:2010ISO 22621-6:2010(E) ISO 2010 All rights reserved 33.9 pipeline operator private or public organization auth
37、orized to design, construct or operate and maintain a gas supply system 3.10 soil cover vertical distance between the top of a buried pipe and the normal surface after finishing work 4 Symbols and abbreviated terms deoutside diameter of pipe at any point MOP maximum operating pressure MRS minimum re
38、quired strength RCP rapid crack propagation SDR standard dimension ratio 5 Design 5.1 General A written laying procedure, authorized by the pipeline operator, shall be made available prior to the construction of a pipeline. The laying procedure shall include specification of the jointing procedure,
39、the pipe and fitting materials to be used, the trenching and backfilling requirements, the pressure testing and commissioning requirements, and the data to be collected for the traceability system. The selection of materials, SDR series, dimensions and assembling techniques shall be the responsibili
40、ty of the pipeline operator. There are two SDR series in common use for gas supply systems: SDR 17 and SDR 11. Other SDR series can also be used, such as SDR 26 for renovation. The training and the level of skill of the operator shall be in accordance with the requirements of the jointing procedures
41、. General guidelines for supervision and quality control are given in Clause 8. 5.2 Materials, components and jointing equipment The PA materials and components used shall conform to ISO 22621-1, ISO 22621-2 and ISO 22621-3, as relevant. Other components not covered by the above-mentioned parts of I
42、SO 22621 shall conform to the relevant national standards. If pipes and fittings are to be stored outside, requirements on maximum storage time shall be given in the laying procedure. PA materials shall be stabilized to give protection against a UV radiation level of 3,5 GJ/m2. It is desirable that
43、national bodies give recommendations for allowed storage times in their countries. The fusion equipment used for the construction of the pipeline shall comply with the requirements of ISO 12176-1 or ISO 12176-2. If the operation of the fusion equipment requires an operators badge, the badge shall co
44、nform to ISO 12176-3. BS ISO 22621-6:2010ISO 22621-6:2010(E) 4 ISO 2010 All rights reserved5.3 Maximum operating pressure The maximum operating pressure (MOP) of the system shall be selected by the pipeline operator on the basis of the gas supply system operating requirements and the materials used.
45、 The MOP of a PA system depends on the type of resin used (the MRS), the pipe SDR series and the service conditions, and is limited by the overall service (design) coefficient, C, and the RCP criteria. The overall service (design) coefficient, C, for thermoplastics materials is specified in ISO 1216
46、2. This coefficient is used to calculate the MOP of the pipeline. C shall be greater than or equal to 2 for PA pipeline systems for natural gas. ()F20 MRSMOPSDR 1CD=(1) NOTE The derating factor, DF, is a coefficient used in the calculation of the MOP which takes into account the influence of the ope
47、rating temperature. Derating factors for various operating temperatures are given in Annex A. The ratio of the critical RCP pressure to the MOP shall be W 1,5 at the minimum operating temperature. The critical RCP pressure is dependent on temperature, pipe size and type of PA material used. It is de
48、fined in this subclause in accordance with ISO 22621-1, based on the full-scale test method in accordance with ISO 22621-1:2007, Annex C, which specifies a test temperature of 0 C. Where the pipe temperature decreases below 0 C, the pc/MOP ratio shall be recalculated using a pc(critical pressure) va
49、lue determined from the minimum expected operating temperature of the pipe. If necessary, the value of the MOP shall be reduced so as to maintain the pc/MOP ratio at a value W 1,5. 5.4 Assembly techniques Jointing procedures may vary depending on the pipe size used. Fusion is the preferred jointing method. Preference shall be given to butt fusion and electrofusion. Components made from PA 11 shall be heat fusion jointed only to components made from PA 11. Components made from PA
