1、January 2009DEUTSCHE NORM English price group 7No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 23.040.20!$U=L“1502641w
2、ww.din.deDDIN EN ISO 13968Plastics piping and ducting systems Thermoplastics pipes Determination of ring flexibility (ISO 13968:2008)English version of DIN EN ISO 13968:2009-01Kunststoff-Rohrleitungs- und Schutzrohrsysteme Rohre aus Thermoplasten Bestimmung der Ringflexibilitt (ISO 13968:2008)Englis
3、che Fassung DIN EN ISO 13968:2009-01SupersedesDIN EN 1446:1996-03www.beuth.deDocument comprises 9 pagesDIN EN ISO 13968:2009-01 2 National foreword This standard has been prepared by Technical Committee ISO/TC 138 “Plastics pipes, fittings and valves for the transport of fluids” in collaboration wit
4、h Technical Committee CEN/TC 155 “Plastics piping systems and ducting systems” (Secretariat: NEN, Netherlands). The responsible German body involved in its preparation was the Normenausschuss Kunststoffe (Plastics Standards Committee), Technical Committee NA 054-05-02 AA Prfverfahren fr Rohre. The D
5、IN Standard corresponding to the International Standard referred to in this document is as follows: ISO 9969 DIN EN ISO 9969 Amendments This standard differs from DIN EN 1446:1996-03 as follows: a) The technical substance of EN 1446:1996-03 has been largely incorporated in this standard. b) Unless o
6、therwise specified in the referring standard, the deflection shall be 30 % of the outside diameter. c) A table of contents has been added. d) The standard has been editorially revised. Previous editions DIN EN 1446: 1996-03 National Annex NA (informative) Bibliography DIN EN ISO 9969, Thermoplastics
7、 pipes Determination of ring stiffness EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 13968 October 2008 ICS 23.040.20 Supersedes EN 1446:1996 English Version Plastics piping and ducting systems - Thermoplastics pipes - Determination of ring flexibility (ISO 13968:2008) Systmes de canalisa
8、tions et de gaines en matires plastiques - Tubes en matires thermoplastiques - Dtermination de la flexibilit annulaire (ISO 13968:2008) Kunststoff-Rohrleitungs- und Schutzrohrsysteme - Rohre aus Thermoplasten - Bestimmung der Ringflexibilitt (ISO 13968:2008) This European Standard was approved by CE
9、N on 14 October 2008. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standard
10、s 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 translation under the responsibility of a CEN member into its own language and notified to t
11、he CEN Management Centre has the same status as the official 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, Lithuania, Luxembourg, Malta, Nethe
12、rlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitatio
13、n in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 13968:2008: E2 DIN EN ISO 13968:2009-01 EN ISO 13968:2008 (E) Contents Page Foreword .3 1 Scope4 2 Normative references4 3 Terms and definitions .4 4 Principle .4 5 Apparatus.5 6 Test pieces .5 7 Conditioning
14、 5 8 Procedure.5 9 Test report6 Bibliography7 3 Foreword This document (EN ISO 13968:2008) has been prepared by Technical Committee ISO/TC 138 “Plastics pipes, fittings and valves for the transport of fluids“ in collaboration with Technical Committee CEN/TC 155 “Plastics piping systems and ducting s
15、ystems” 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 endorsement, at the latest by April 2009, and conflicting national standards shall be withdrawn at the latest by April 2009. Atte
16、ntion 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 identifying any or all such patent rights. This document supersedes EN 1446:1996. According to the CEN/CENELEC Internal Regulations,
17、the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,
18、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 CEN as a EN ISO 13968:2008 without any modification. EN ISO 13968:2008 (E) DIN EN ISO 13968:2009-01 1 Scope This International
19、Standard specifies a method for testing the ring flexibility of a thermoplastics pipe having a circular cross-section. 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 T
20、he 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 9969, Thermoplastics pipes Determination of ri
21、ng stiffness 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 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 t
22、ested by measuring the force and the deflection while deflecting a ring section from the pipe diametrically at a constant 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 seve
23、ral specific types of mechanical failure. NOTE It is assumed that the following test parameters are set by the standard 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 a
24、ppropriate, see 8.1. 4 DIN EN ISO 13968:2009-01 EN ISO 13968:2008 (E) 5 Apparatus 5.1 Compression 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 an
25、d force measuring devices, conforming to ISO 9969, but capable of measuring diametric deflections 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 res
26、pectively. The referring standard may specify longer test pieces than defined in ISO 9969. 7 Conditioning 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 ei
27、ther inside diameter or outside diameter until the specified deflection has been achieved. Unless 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
28、 has been reached or the test piece has failed, whichever occurs first. If desired, the deflection 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,
29、 and inspect and record the type and the position of each event a) to e) with respect to the corresponding 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.
30、 c) Check for any wall delamination. d) Check for any permanent buckling in any part of the structure 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 failur
31、es. 5 EN ISO 13968:2008 (E) DIN EN ISO 13968:2009-01 9 Test report The test 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 p
32、ipe, 3) dimensions, 4) production date, 5) lengths of test pieces, 6) mass per 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
33、and force at the maximum point, if a maximum occurred; g) any factors which may have affected the results, such as any incidents or any operating details not specified in this International Standard; h) the date of test. 6 DIN EN ISO 13968:2009-01 EN ISO 13968:2008 (E) Bibliography 1 EN 13476-1:2007
34、, Plastics piping systems for non-pressure underground drainage 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 7 EN ISO 13968:2008 (E) DIN EN ISO 13968:2009-01
