【AS澳大利亚标准】AS 2944.2-2007 Plastics pipes and fittings for gas reticulation - Polyamide fittings.doc

as 2944.22007accessed by university of south australia on 06 mar 2008as 2944.22007australian standardplastics pipes and fittings for gas reticulationpart 2: polyamide fittingsthis australian standard was prepared by committee pl-021, pvc, abs and polyamidepipe systems. it was approved on behalf of the council of standards australia on12 october 2007.this standard was published on 31 december 2007.the following are represented on committee pl-021:australian chamber of commerce and industryaustralian nuclear science and technology organisationcertification interests (australia)csiro manufacturing and infrastructure technologyenergy networks associationengineers australianew zealand local governmentmaster plumbers, gasfitters and drainlayers new zealandnew zealand water and waste associationplastics industry pipe association of australiaplastics new zealandwater services association of australiathis standard was issued in draft form for comment as dr 05469.standards australia wishes to acknowledge the participation of the expert individuals that contributed to the development of this standard through their representation on the committee and through the public comment period.accessed by university of south australia on 06 mar 2008keeping standards up-to-dateaustralian standards are living documents that reflect progress in science, technology and systems. to maintain their currency, all standards are periodically reviewed, and new editions are published. between editions, amendments may be issued.standards may also be withdrawn. it is important that readers assure themselves they are using a current standard, which should include any amendments that may have been published since the standard was published.detailed information about australian standards, drafts, amendments and new projects can be found by visiting .authe standard is downloaded from standard sharingstandards australia welcomes suggestions for improvements, and encourages readers to notify us immediately of any apparent inaccuracies or ambiguities. contact us via email at .au, or write to standards australia, gpo box 476, sydney, nsw 2001.as 2944.22007accessed by university of south australia on 06 mar 2008australian standardplastics pipes and fittings for gas reticulationpart 2: polyamide fittingsoriginated as as 2944.21987. second edition 2007.copyright standards australiaall rights are reserved. no part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher.published by standards australia gpo box 476, sydney, nsw 2001, australiaisbn 0 7337 8480 13as 2944.22007prefacethis australian standard was prepared by the australian members of the joint standards australia/standards new zealand committee pl-021, pvc, abs and polyamide pipe systems, to supersede as 2944.21987. after consultation with stakeholders in both countries, standards australia and standards new zealand decided to develop this standard as an australian standard rather than an australian/new zealand standard.this standard complements as 2944.1, plastic pipes and fittings for gas reticulation, part 1: polyamide pipes and as 2943, plastics pipes and fittings for gas reticulation polyamide compounds.the objective of this standard is to provide minimum requirements for the manufacture and performance of polyamide fittings for pressure applications for use by manufacturers, specifiers and purchasers of these products.in the preparation of this standard, consideration has been given to international best practice.the test criteria specified apply to fittings at the time of manufacture. fittings that have been in service might not meet the same performance requirements.the term normative has been used in this standard to define the application of the appendix to which it applies. a normative appendix is an integral part of a standard.the standard is downloaded from standard sharingaccessed by university of south australia on 06 mar 2008statements expressed in mandatory terms in notes to tables and figures are deemed to be requirements of this standard. notes to text are for information and guidance only.accessed by university of south australia on 06 mar 2008contentspage1scope .4 2referenced documents . 43notation . 44classification. . 45composition. . 56freedom from defects. 57diameter and wall thickness . 58test requirements. 59marking. . 5appendix a means for demonstrating compliance with thisstandard . 711as 2944.22007standards australiaaustralian standardplastics pipes and fittings for gas reticulationpart 2: polyamide fittings1 scopethis standard specifies requirements for moulded polyamide external fittings for use with polyamide gas pipe, suitable for operation at pressures up to and including 400 kpa.2 applicationdetermination of compliance with this standard shall be in accordance with appendix a.3 referenced documentsthe following documents are referred to in this standard: as1199sampling procedures for inspection by attributes1199.1part 1: sampling schemes indexed by acceptance quality limit (aql) for lot- by-lot inspection2943plastics pipes and fittings for gas reticulationpolyamide compounds2944plastics pipes and fittings for gas reticulation2944.1part 1: polyamide pipesas/nzs1462methods of test for plastics pipes and fittings1462.1part 1: method for determining the dimensioning of pipes and fittings1462.6part 6: method for hydrostatic pressure testing of pipes standards a.auhbaccessed by university of south australia on 06 mar 200818.28conformity assessmentguide 28: guidance on a third-party certification system for products4 notationthe following symbols are used in this standard:de = nominal outside diameter, in millimetresdi= socket mouth mean diameter, in millimetresdr= socket root mean diameter, in millimetresl= socket length, in millimetrest= wall thickness, in millimetrest = socket taper, in millimetres (equivalent to didr)5 classificationpolyamide external fittings shall be classified as class 400, that is, for service at pressuresthe standard is downloaded from standard sharingup to and including 400 kpa and at temperatures in the range20 c to +35 c.6 compositionpolyamide fittings shall be manufactured from polyamide compound complying withas 2943, as agreed between the manufacturer and purchaser.the addition of rework from the manufacturers own production of fittings to this standard is permissible. pa 11 rework shall only be added to pa 11 production runs. similarly, pa12 rework shall only be added to pa 12 production runs. no other rework materials shall beused.7 freedom from defectsfittings shall be free from blisters, foreign matter and heat marks. when grooves, wrinkles, dents, or projections are present the fitting dimensions shall comply with the requirements of table 1.8 diameter, wall thickness and lengthwhen measured in accordance with as/nzs 1462.1, the diameter, wall thickness and length of fittings shall conform to the dimensions given in table 1.9 test requirements9.1 resistance to internal pressure at elevated temperaturefittings shall be assembled in accordance with the manufacturers instructions to pipes complying with as 2944.1. the assemblies shall then be tested in accordance withas/nzs 1462.6 and withstand an internal pressure equivalent to a hoop stress in the pipe of11.5 mpa for 44 +0.5,0 h at a temperature of 80 2 c.accessed by university of south australia on 06 mar 2008all branches or outlets of fittings shall be completely assembled in accordance with the use for which they are intended.10 markingall fittings shall be durably marked or moulded with the following information: (a)manufacturers name and registered trademark.(b) identification of material, in the form pa 11 or pa 12 as appropriate. (c)class of fitting, in the form class 400, as appropriate.(d) nominal outside diameter of the pipe for which the fitting is intended, in the formod 32, as appropriate. (e)batch number.(f) the number of this standard, i.e., as 2944.2note: manufacturers making a statement of compliance with this australian standard on a product, packaging or promotional material related to that product are advised to ensure that such compliance is capable of being verified.markings shall not score or break the surface of the fittings.the standard is downloaded from standard sharingtable 1external sockets (see figure 1)millimetresnominal outsidediametermean mouth diametersocket length,minimumwallthicknesstaper,maximumdi mindi maxlmtmint161820232532405063759011016020025015.617.619.622.624.631.639.649.662.574.589.4109.4159.3199.2249.115.917.919.922.924.931.939.949.962.974.989.9109.9159.9199.9249.926303334353240506375901101602002003.05.56.08.91.11.3notes:1 minimum root diameter (dr mi n ) is the actual (as measured) socket mouth diameter (di)less any taper.2 the measured root diameter (dr) should not be more than the actual socket mouth diameter (di) as measured, i.e. taper is not mandatory in the socket.accessed by university of south australia on 06 mar 2008figure 1 typical external socketaccessed by university of south australia on 06 mar 2008appendix ameans for demonstrating compliance with this standard(normative)a1 scopethis appendix sets out two means by which compliance with this standard has to be demonstrated by a manufacturer, as follows:(a) the use of a product certification scheme.(b) the use of a minimum sampling and testing frequency plan.a2 relevancethe long-term performance of pipeline systems is critical to the operating efficiency of water agencies in terms of operating licences and customer contracts. the long-term performance of plumbing systems is similarly critical to the durability of building infrastructure, protection of public health and safety and protection of the environment.a3 definitionsa3.1 acceptable quality level (aql)when a continuous series of lots or batches is considered, the quality level which, for the purpose of sampling inspection, is the limit of a satisfactory process average (see as 1199.1).note: the designation of an aql does not imply that a manufacturer has the right knowingly to supply any non-conforming unit of product.a3.2 batchschedule of fittings, all of the same nominal diameter, wall thickness and marking, manufactured from the same material or compound on the same machine.note: the batch is defined and identified by the fitting manufacturer.a3.3 batch release test (brt)a test performed on a sample from the batch or lot, to confirm conformance to the requirements of this standard before the batch can be released.a3.4 inspection levelthe relationship between the batch or lot size and the sample size (see as 1199.1).a3.5 lota clearly identifiable subdivision of a batch for inspection purposes.a3.6 new formulationa change in material or compound formulation that exceeds the limits specified inappendix a of as 2943.a3.7 process verification test (pvt)a test performed on a sample at specific intervals, to confirm conformance to the requirements of this standard before further batches can be released.the standard is downloaded from standard sharinga3.8 sampleone or more units of product drawn from a batch or lot, selected at random without regard to quality.note: the number of units of product in the sample is the sample size.a3.9 sampling plana specific plan that gives the number of samples and the frequency of inspection or testing.a3.10 type test (tt)a test performed on a sample to confirm conformance to the requirements of this standard before any batches can be released.a4 product certificationthe purpose of product certification is to provide independent assurance of the claim by the manufacturer that products comply with this standard.the certification scheme shall meet the criteria described in sa hb 18.28/sanz hb 18.28 in that, as well as full type testing from independently sampled production and subsequent verification of conformance, it requires the manufacturer to maintain effective planning to control production.the certification scheme serves to indicate that the products consistently conform to the requirements of this standard.product certification shall be conducted by a certification body accredited by the joint accreditation system for australia and new zealand (jas-anz) or by another certification body that is acceptable to jas-anz.the frequency of the sampling and testing plan, as detailed in paragraph a5, shall be used by the certifying body for product compliance auditing. however, where the manufacturer can demonstrate adequate process control to the certifying body, the frequency of sampling and testing nominated in the manufacturers quality and/or documented procedures shall take precedence for the purpose of product certification.accessed by university of south australia on 06 mar 2008a5 minimum sampling and testing frequency plan a5.1 generaltable a1 sets out the minimum sampling and testing frequency plan for a manufacturer to demonstrate compliance of product(s) to this standard.a5.2 retestingin the event of a test failure, the products manufactured since the previous test(s) conforming to the requirements outlined in table a1 shall be quarantined as a batch. a further set of samples shall be selected randomly from the quarantined batch using a sampling plan to as 1199.1 for an acceptable quality level (aql) of 2.5 and an inspection level of s3, unless otherwise specified. if the retest requirements are met, the batch may be released and compliance with this standard for the quarantined batch may be claimed.should a failure occur on retesting, then the quarantined batch shall be rejected and claims and/or marking indicating compliance to this standard shall be suspended until the cause of the failure has been identified and corrected.a5.3 rejection after testin the event of a quarantined batch being rejected after retesting in accordance with the procedures set out in paragraph a5.2, it may be subjected to 100% testing for the failed requirement(s), and only those items found to comply may be claimed and/or marked as complying with this standard.accessed by university of south australia on 06 mar 2008table a1minimum sampling and testing frequency plancharacteristicsclauserequirementtest methodfrequencytype tests (tt)material property6compositionprocess controlany new material formulation or design or once every 5 years,whichever occurs first7freedom from defectsvisual inspectionany new material formulation or designperformance8dimensionsas/nzs 1462.1any new material formulation9.1resistance to internal pressure at elevated temperatureas/nzs 1462.610markingvisual inspectionprocess verification tests (pvt)performance9.1resistance to internal pressure at elevated temperatureas/nzs 1462.6to manufacturers sampling plan. samples to be evenly selected from all pressure groups in such a way that units of each produced dn are tested regularly and continuously,at least once every 3 yearsbatch release tests (brt)performan