1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-2384-6 SANS 18225:2009Edition 1ISO 18225:2007Edition 1SOUTH AFRICAN NATIONAL STANDARD Plastics piping systems Multilayer piping systems fo
4、r outdoor gas installations Specifications for systems This national standard is the identical implementation of ISO 18225:2007 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191
5、 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 18225:2009 Edition 1 ISO 18225:2007 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS SC 138H, Water and sanitation Equipment and syst
6、ems Plastics pipes and fittings, in accordance with the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in December 2009. Reference numberISO 18225:2007(E)ISO 2007INTERNATIONAL STANDARD ISO18225First edition2007-10-15Plastics piping syst
7、ems Multilayer piping systems for outdoor gas installations Specifications for systems Systmes de canalisations en plastique Tubes multicouches destins lalimentation en gaz lextrieur des btiments Spcifications pour les systmes SANS 18225:2009This s tandard may only be used and printed by approved su
8、bscription and freemailing clients of the SABS .ISO 18225:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed
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11、 inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2007 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, wi
12、thout 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 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2007 All r
13、ights reservedSANS 18225:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 18225:2007(E) ISO 2007 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 2 4 Pipes.
14、 6 5 Fittings . 12 6 Fitness for purpose of the system 12 7 Marking and documentation 13 Annex A (normative) List of reference product standards 14 Annex B (normative) Testing resistance to gas constituents . 15 Annex C (normative) Testing resistance to weathering of outer layer of M-pipes 16 Biblio
15、graphy . 18 SANS 18225:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 18225:2007(E) iv ISO 2007 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodi
16、es (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 organizations
17、, 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 IS
18、O/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 the
19、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 18225 was prepared by Technical Committee ISO/TC 138, Plastics pipe
20、s, fittings and valves for the transport of fluids, Subcommittee SC 4, Plastics pipes and fittings for the supply of gaseous fuels. SANS 18225:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 18225:2007(E) ISO 2007 All rights reserved
21、vIntroduction The test methods used in this International Standard have been developed by ISO TC 138/SC 5 as far as possible. However, not all the required methods were in the SC 5 standards development work programme at the time of publication of this International Standard, so they have been place
22、d in its annexes. When those methods are developed for other International Standards, these annexes will be redundant. For multilayer pipe construction consisting of a layer of a reference standard material, an adhesive and a non-stress designed layer Procedure I and the relevant product standards a
23、re required to be followed for all aspects, excepting for those of delamination and if applicable oxygen permeation. For example, layers can have the following purposes: the ability to withstand pressure; the ability to realize interlayer adhesion; the ability to block or greatly diminish incoming U
24、V light and/or sunlight; the ability to mechanically protect the outside layer; the ability to control longitudinal expansion; the ability to give the multilayer pipe a colour (inside or outside layer). Moreover, some characteristics can be combined in one layer. SANS 18225:2009This s tandard may on
25、ly be used and printed by approved subscription and freemailing clients of the SABS .SANS 18225:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 18225:2007(E) ISO 2007 All rights reserved 1Plastics piping systems
26、 Multilayer piping systems for outdoor gas installations Specifications for systems 1 Scope This International Standard specifies general and performance requirements for multilayer pipe systems based on pipes made from thermoplastics and intended to be used for gas supply. It gives requirements for
27、 the design of pipe systems consisting of multilayer pipes based on thermoplastics and for which at least 60 % of the wall thickness is of a polymeric material. The polymeric material used for stress design layers and all inner layers must be polyethylene (PE) and/or crosslinked polyethylene (PE-X),
28、 in accordance with Annex A. The outer layers of metal multilayer pipes must be of either PE or PE-X. NOTE For the purposes of this International Standard, PE-RT is considered as PE, while PE-X and adhesive layers are considered as thermoplastics materials. This International Standard is applicable
29、to systems intended to be operated at temperatures ranging from 20 C to 40 C. It is applicable to pipes in these systems having a nominal diameter up to and including 630 mm, and to the supply of gaseous fuels of categories D (natural gas) and E (LPG vapour and natural gas or LPG vapour) (see ISO 13
30、623). 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 161-1, Thermopla
31、stics pipes for the conveyance of fluids Nominal outside diameters and nominal pressures Part 1: Metric series ISO 497, Guide to the choice of series of preferred numbers and of series containing more rounded values of preferred numbers ISO 1167 (all parts),Thermoplastics pipes, fittings and assembl
32、ies for the conveyance of fluids Determination of the resistance to internal pressure ISO 3126, Plastics pipes Measurement of dimensions 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
33、and fittings Specification for material 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 hydrostatic strength of t
34、hermoplastics materials in pipe form by extrapolation ISO 9969, Thermoplastics pipes Determination of ring stiffness ISO 10146, Crosslinked polyethylene (PE-X) pipes Effect of time and temperature on the expected strength SANS 18225:2009This s tandard may only be used and printed by approved subscri
35、ption and freemailing clients of the SABS .ISO 18225:2007(E) 2 ISO 2007 All rights reservedISO 10838-1, Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels Part 1: Metal fittings for pipes of nominal outside diameter less than or equal to 63 mm ISO 12162, Thermoplasti
36、cs materials for pipes and fittings for pressure applications Classification and designation Overall service (design) coefficient ISO 13968, Plastics piping and ducting systems Thermoplastics pipes Determination of ring flexibility ISO 14531-1, Plastics pipes and fittings Crosslinked polyethylene (P
37、E-X) pipe systems for the conveyance of 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-
38、3. Plastics pipes and fittings Crosslinked 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) ISO 16871, Plastics piping and ducting systems Plastics pipes and fittings Method f
39、or exposure to direct (natural) weathering ISO 17454, Plastics piping systems Multilayer pipes Test method for the adhesion of the different layers using a pulling rig ISO 17456:2006, Plastics piping systems Multilayer pipes Determination of long-term strength ISO 24033:2006, Pipes made of raised-te
40、mperature-resistance polyethylene (PE-RT) Effect of time and temperature on the expected strength EN 573-3, Aluminium and aluminium alloys Chemical composition and form of wrought products Part 3: Chemical composition EN 12117, Plastics piping systems Fittings, valves and ancillaries Determination o
41、f gaseous flow rate/pressure drop relationships 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 Structural definitions 3.1.1 Construction groups 3.1.1.1 construction group A group comprising multilayer pipes in which all the layers considered
42、 to be designed for stress-bearing are made of polymeric materials selected from the list of reference product standards NOTE 1 See Annex A for the list of reference product standards. NOTE 2 For this definition, adhesives are not considered as stress-designed layers. 3.1.1.2 construction group B gr
43、oup comprising multilayer pipes in which all the layers considered to be designed for stress-bearing are made of polymeric materials selected from the list of reference product standards and which include a stress bearing metallic layer NOTE 1 See Annex A for the list of reference product standards.
44、 NOTE 2 For this definition, adhesives are not considered as stress-designed layers. SANS 18225:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 18225:2007(E) ISO 2007 All rights reserved 33.1.2 multilayer pipe pipe comprised of severa
45、l stress-designed layers 3.1.3 multilayer M pipe multilayer pipe comprised of polymers and one metallic layer, whose pipe wall thickness consists of at least 60 % of polymer layers 3.1.4 multilayer P pipe pipe comprised of more than one stress-designed polymeric layer EXAMPLE PE/PE-X. 3.1.5 layer ho
46、mogeneous circumferential section of pipe wall that has chemical and/or mechanical and/or physical characteristics different from those of its immediate neighbours 3.1.6 inner layer layer in contact with the conveyed fluid 3.1.7 outer layer layer exposed to the outer environment 3.1.8 embedded layer
47、 layer between the outer and inner layer 3.2 Geometrical definitions 3.2.1 nominal diameter dnspecified diameter, in millimetres, assigned to a nominal size (DN/OD or DN/ID) 3.2.2 outside diameter deoutside diameter measured through its cross-section at any point of a pipe, or the fitting end of a f
48、itting, rounded to the next greater 0,1 mm 3.2.3 mean outside diameter demmeasured length of the outer circumference of the pipe divided by , rounded up to the nearest 0,1 mm NOTE The value for is taken to be 3,142. 3.2.4 inside diameter divalue of the measurement of the inside diameter through its
49、cross-section at any point of a pipe, rounded to the next greater 0,1 mm SANS 18225:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 18225:2007(E) 4 ISO 2007 All rights reserved3.2.5 mean inside diameter dimaverage value of a number of equally spaced measurements of inside diameter in the same cross-section of the pipe, rounded to the next greater
