1、BS EN ISO13968:2008ICS 23.040.20NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPlastics piping andducting systems Thermoplastics pipes Determination ofring flexibility (ISO13968:2008)This British Standardwas published under theauthority of the StandardsPolicy a
2、nd StrategyCommittee on 30 June 2009 BSI 2009ISBN 978 0 580 56653 0Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 13968:2008National forewordThis British Standard is the UK implementation of EN ISO 13968:2008.It supersedes BS EN 1446:1996 which is withdrawn.The UK participation
3、 in its preparation was entrusted to TechnicalCommittee PRI/88/4, Test methods.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correc
4、t application.Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 13968October 2008ICS 23.040.20 Supersedes EN 1446:1996 English VersionPlastics piping and ducting systems - Thermoplastics pipes -Determination of ring
5、flexibility (ISO 13968:2008)Systmes de canalisations et de gaines en matiresplastiques - Tubes en matires thermoplastiques -Dtermination de la flexibilit annulaire (ISO 13968:2008)Kunststoff-Rohrleitungs- und Schutzrohrsysteme - Rohreaus Thermoplasten - Bestimmung der Ringflexibilitt (ISO13968:2008)
6、This European Standard was approved by CEN on 14 October 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical refer
7、ences concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member int
8、o its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, L
9、ithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008
10、CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 13968:2008: EBS EN ISO 13968:2008EN ISO 13968:2008 (E) 3 Foreword This document (EN ISO 13968:2008) has been prepared by Technical Committee ISO/TC 138 “Plastics pipes, fittings and
11、 valves for the transport of fluids“ in collaboration with Technical Committee CEN/TC 155 “Plastics piping systems and ducting systems” the secretariat of which is held by NEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by e
12、ndorsement, at the latest by April 2009, and conflicting national standards shall be withdrawn at the latest by April 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for ident
13、ifying any or all such patent rights. This document supersedes EN 1446:1996. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark,
14、Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 13968:2008 has been approved by
15、 CEN as a EN ISO 13968:2008 without any modification. BS EN ISO 13968:2008ISO 13968:2008(E) ISO 2008 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Internationa
16、l 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 liaison with ISO,
17、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 technical commi
18、ttees 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 drawn to the po
19、ssibility 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 13968 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcom
20、mittee SC 5, General properties of pipes, fittings and valves of plastic materials and their accessories Test methods and basic specifications. This second edition cancels and replaces the first edition (ISO 13968:1997), which has been technically revised. BS EN ISO 13968:2008BS EN ISO 13968:2008INT
21、ERNATIONAL STANDARD ISO 13968:2008(E) ISO 2008 All rights reserved 1Plastics piping and ducting systems Thermoplastics pipes Determination of ring flexibility 1 Scope This International Standard specifies a method for testing the ring flexibility of a thermoplastics pipe having a circular cross-sect
22、ion. The method enables determination of the deflection, and necessary force, at which physical damage, if any, occurs within the specified diametric deflection. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, on
23、ly the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 9969, Thermoplastics pipes Determination of ring stiffness 3 Terms and definitions For the purposes of this document, the following terms and definitions apply.
24、 3.1 ring flexibility ability of a pipe to resist ring diametric deflection without loss of structural integrity EN 13476-1:2007, 3.1.2.10 4 Principle The ring flexibility of a pipe is tested by measuring the force and the deflection while deflecting a ring section from the pipe diametrically at a c
25、onstant speed until at least the specified deflection is achieved or prior fracture has occurred. Each test piece is monitored during testing and subsequently inspected for signs of several specific types of mechanical failure. NOTE It is assumed that the following test parameters are set by the sta
26、ndard making reference to this International Standard: a) if appropriate, a greater length of the test pieces than the length specified in ISO 9969, see Clause 6; b) the deflection, if appropriate, see 8.1. BS EN ISO 13968:2008ISO 13968:2008(E) 2 ISO 2008 All rights reserved5 Apparatus 5.1 Compressi
27、on testing machine, as specified in ISO 9969, but capable of producing at least the specified diametric deflection of the test piece at the applicable speed (see ISO 9969:2007, Table 1). 5.2 Dimensional and force measuring devices, conforming to ISO 9969, but capable of measuring diametric deflectio
28、ns up to at least the specified deflection and the corresponding compressive forces. 6 Test pieces Prepare three test pieces from a single pipe, as specified in ISO 9969, and designate them a, b, and c respectively. The referring standard may specify longer test pieces than defined in ISO 9969. 7 Co
29、nditioning Condition the test pieces as specified in ISO 9969. 8 Procedure 8.1 Conduct the test in accordance with the procedure given in ISO 9969, but continue compression while measuring the change in either inside diameter or outside diameter until the specified deflection has been achieved. Unle
30、ss otherwise specified in the referring standard, the deflection shall be 30 % of the outside diameter. During the compression, monitor for signs of failure (see 8.2), until either the specified deflection has been reached or the test piece has failed, whichever occurs first. If desired, the deflect
31、ion may be continued after a failure has occurred or the specified deflection has been reached in order to determine other properties of the pipe. 8.2 For each test piece, prepare a force/deflection graph, and inspect and record the type and the position of each event a) to e) with respect to the co
32、rresponding force and deflection. a) Inspect the force/deflection graph for compliance to the requirements in the referring standard. b) Check for any cracking or crazing in any part of the wall structure. c) Check for any wall delamination. d) Check for any permanent buckling in any part of the str
33、ucture of the pipe wall. e) Make any other observation as specified in the referring standard. Whitening of the pipe shall not be considered as an indication of one of the above-mentioned mechanical failures. BS EN ISO 13968:2008ISO 13968:2008(E) ISO 2008 All rights reserved 39 Test report The test
34、report shall include at least the following information: a) a reference to this International Standard and to the referring standard; b) the identification of the thermoplastics pipe, including: 1) manufacturer, 2) type of pipe, 3) dimensions, 4) production date, 5) lengths of test pieces, 6) mass p
35、er metre length of the pipe; c) the test temperature; d) the force/deflection graph for each test piece; e) where appropriate, the force and deflection at which any of the events specified in 8.2 occurred; f) the deflection and force at the maximum point, if a maximum occurred; g) any factors which
36、may have affected the results, such as any incidents or any operating details not specified in this International Standard; h) the date of test. BS EN ISO 13968:2008ISO 13968:2008(E) 4 ISO 2008 All rights reservedBibliography 1 EN 13476-1:2007, Plastics piping systems for non-pressure underground dr
37、ainage and sewerage Structured-wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) Part 1: General requirements and performance characteristics BS EN ISO 13968:2008BS EN ISO13968:2008BSI GroupHeadquarters 389Chiswick High Road,London, W4 4AL, U
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