1、 ISO 2012 Plastics piping systems for the supply of gaseous fuels Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing Part 6: Code of practice for design, handling and installation Systmes de canalisations en matires plastiques pour la distribution de combustib
2、les gazeux Systmes de canalisations en polyamide non plastifi (PA-U) avec assemblages par soudage et assemblages mcaniques Partie 6: Code de pratique pour la conception, la manutention INTERNATIONAL STANDARD ISO 16486-6 First edition 2012-06-01 Reference number ISO 16486-6:2012(E) ISO 16486-6:2012(E
3、) ii ISO 2012 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2012 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 permission in writin
4、g 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 Switzerland ISO 16486-6:2012(E) ISO 2012 All rights res
5、erved iii Contents Page Foreword iv Introduction v 1 Scope 1 2 Normative references . 1 3 T erms and definitions . 2 4 Symbols and abbreviated terms . 2 5 Design . 3 5.1 General . 3 5.2 Materials, components and jointing equipment 3 5.3 Maximum operating pressure 3 5.4 Assembly techniques . 4 5.5 Sq
6、ueeze-off properties . 4 6 Installation . 4 6.1 Jointing procedure 4 6.2 Training 5 6.3 Heated-tool fusion jointing . 5 6.4 Electrofusion jointing . 9 6.5 Laying .12 7 Storage, handling and transport .14 7.1 General .14 7.2 Storage .14 7.3 Handling .15 7.4 Transport .16 8 Quality control 16 8.1 Gene
7、ral .16 8.2 Inspection prior to laying 16 8.3 Inspection during laying 17 Annex A (normative) Derating coefficients for operating temperatures .19 Bibliography .20 ISO 16486-6:2012(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bo
8、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
9、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
10、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
11、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 16486-6 was prepared by Technical Committee ISO/TC 138, Plastics
12、pipes, fittings and valves for the transport of fluids, Subcommittee SC 4, Plastics pipes and fittings for the supply of gaseous fuels. This first edition of ISO 16486-6 cancels and replaces the first edition of ISO 22621-6:2010 which has been technically revised. ISO 16486 consists of the following
13、 parts, under the general title Plastics piping systems for the supply of gaseous fuels Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing: Part 1: General Part 2: Pipes Part 3: Fittings Part 5: Fitness for purpose of the system Part 6: Code of practice for de
14、sign, handling and installation iv ISO 2012 All rights reserved ISO 16486-6:2012(E) Introduction Thin wall thickness unplasticized polyamide (PA-U) pipes and solvent cement joints are used typically for low pressures, while thicker wall thickness pipes and butt fusion, electrofusion or mechanical jo
15、ints are typically used for high pressures. For technical and safety reasons, it is not possible to mix the components of the two types of piping system (thin wall thickness pipes cannot be jointed by butt fusion or mechanical joints and vice versa). In particular, solvent cement joints must not be
16、used for jointing for high pressure piping systems. So for the time being, the standardization programme dealing with unplasticized polyamide (PA-U) piping systems for the supply of gaseous fuels is split into two series of International Standards, with one series (ISO 17467) covering piping systems
17、 the components of which are connected by solvent cement jointing and the other (ISO 16486) the components of which are connected by fusion jointing and/or mechanical jointing. When more experience will be gained from the field, it might be reasonable to merge the ISO 17467 series and the ISO 16486
18、series in one single series applicable to PA-U piping systems. A similar series (ISO 17135) for fusion and mechanically jointed plasticized polyamide (PA-P) piping systems is in preparation. ISO 2012 All rights reserved v Plastics piping systems for the supply of gaseous fuels Unplasticized polyamid
19、e (PA-U) piping systems with fusion jointing and mechanical jointing Part 6: Code of practice for design, handling and installation 1 Scope This part of ISO 16486 specifies a code of practice dealing with unplasticized polyamide (PA-U) piping systems, intended to be buried outside buildings and used
20、 for the supply of gaseous fuels. It addresses the common basic principles for gas supply systems. More detailed national standards or codes of practice might exist in the ISO member countries. This part of ISO 16486 is intended to be applied in association with those national standards or codes of
21、practice related to the above-mentioned basic principles. 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, transportation, laying conditions and fusion quality contro
22、l of PA-U 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 16486 are butt fusion jointing and electrofusion jointing. No special p
23、recautions are necessary for areas exposed to the influence of mining and earthquakes other than those precautions mentioned in this part of ISO 16486. It is the responsibility of users of this part of ISO 16486 to take existing and new national regulations into account. 2 Normative references The f
24、ollowing documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 12162, T
25、hermoplastics 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 Equipment for fusion jo
26、inting 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 ISO 16486-1, Plast
27、ics piping systems for the supply of gaseous fuels Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing Part 1: General ISO 16486-2, Plastics piping systems for the supply of gaseous fuels Unplasticized polyamide (PA-U) piping systems with fusion jointing and me
28、chanical jointing Part 2: Pipes INTERNATIONAL STANDARD ISO 16486-6:2012(E) ISO 2012 All rights reserved 1 ISO 16486-6:2012(E) ISO 16486-3, Plastics piping systems for the supply of gaseous fuels Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing Part 3: Fittin
29、gs ISO 16486-5, Plastics piping systems for the supply of gaseous fuels Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing Part 5: Fitness for purpose of the system 3 T erms and definitio ns For the purposes of this document, the terms, definitions, symbols an
30、d abbreviated terms given in ISO 16486-1 and ISO 16486-5 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 shor
31、test distance between the outer limits of two objects 3.3 drag resistance frictional resistance due to the weight of the length of pipe fixed in the moveable clamp at the point at which movement of the moveable clamp is initiated (peak drag), or the friction occurring during movement (dynamic drag)
32、3.4 electrofusion control box unit implementing the 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
33、mechanism of a butt fusion machine 3.6 interface 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-U systems from pipes and/or fittings, based on a written procedure agreed b
34、y the pipeline operator 3.8 pipeline operator private or public organization authorized to design, construct or operate and maintain a gas supply system 3.9 soil cover vertical distance between the top of a buried pipe and the normal surface after finishing work 4 Symbols and abbreviated terms C des
35、ign coefficient CRS categorized required strength d e outside diameter of pipe at any point 2 ISO 2012 All rights reserved ISO 16486-6:2012(E) D F derating coefficient MOP maximum operating pressure MRS minimum required strength RCP rapid crack propagation SDR standard dimension ratio 5 Design 5.1 G
36、eneral 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, the pipe and fitting materials to be used, the trenching and backfilling requirements,
37、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 responsibility of the pipeline operator. There are two SDR series in common use for gas supply syst
38、ems: 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. General guidelines for supervision and quality control are given in Clause 8. 5.2 Mat
39、erials, components and jointing equipment The PA-U materials and components used shall conform to ISO 16486-1, ISO 16486-2 and ISO 16486-3, as relevant. Other components not covered by the above-mentioned parts of ISO 16486 shall conform to the relevant national standards. If pipes and fittings are
40、to be stored outside, requirements on maximum storage time shall be given in the laying procedure. PA-U materials shall be stabilized to give protection against a UV radiation level of 3,5 GJ/m 2 . It is desirable that national bodies give recommendations for allowed storage times in their countries
41、. 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 conform to ISO 12176-3. 5.3 Maximum operating pressure The maximum operating pressu
42、re (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. The MOP of a PA-U system depends upon the type of resin used (the MRS), the pipe SDR series and the service conditions, and is limited by the design
43、coefficient, C, and the RCP criteria. For greater flexibility in the use of the MRS, the CRS ,tis introduced, where the temperature and the lifetime t may differentiate from the usual values of 20 C and 50 years. The policy retains the well-established MRS basis for the classification of polyamide m
44、aterials in accordance with ISO 12162. The categorized required strength, CRS ,t , is defined in ISO 12162. ISO 2012 All rights reserved 3 ISO 16486-6:2012(E) The design coefficient, C, for thermoplastics materials is specified in ISO 12162. This coefficient is used to calculate the MOP of the pipel
45、ine. C shall be greater than or equal to 2 for PA-U pipeline systems for natural gas. MOP MRS SDR 20 1 CD F(1) or MOP CRS SDR 20 1 ,t C(2) The derating coefficient, D F , is a coefficient used in the calculation of the MOP which takes into account the influence of the operating temperature. Derating
46、 coefficients for various operating temperatures are given in Annex A. The ratio of the critical RCP pressure to the MOP shall be 1,5 at the minimum operating temperature. The critical RCP pressure is dependent on temperature, pipe size and type of PA-U material used. It is defined in this subclause
47、 in accordance with ISO 16486-1, Table 1, based on the full-scale test method in accordance with ISO 13478 (see Table footnote e). Where the pipe temperature decreases below 0 C, the p c /MOP ratio shall be recalculated using a p c(critical pressure) value determined from the minimum expected operat
48、ing temperature of the pipe. If necessary, the value of the MOP shall be reduced so as to maintain the p c /MOP ratio at a value 1,5. 5.4 Assembly techniques Jointing procedures may vary depending upon the pipe size used. Fusion is the preferred jointing method. Preference shall be given to butt fus
49、ion and electrofusion. Components made from PA-U 11 shall be heat fusion jointed only to components made from PA-U 11. Components made from PA-U 12 shall be heat fusion jointed only to components made from PA-U 12. Components made from PA-U are not fusion compatible with components made from other polymers. A written jointing procedure, authorized by the pipeline operator, shall be available prior to the construction of a pipeline. The jointing procedure shall in
