1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 13956:2010Plastics pipes and fittings Decohesion test ofpolyethylene (PE) saddle fusionjoints Evaluation of ductilityof fusion joint interface by teartestBS ISO 13956:2010
2、 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 13956:2010.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/88/4, Test Methods - Plastic Piping.A list of organizations represented on this committee can beobtained on request to it
3、s secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 62581 7ICS 23.040.60Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was p
4、ublished under the authority of theStandards Policy and Strategy Committee on 31 October 2010.Amendments issued since publicationDate Text affectedBS ISO 13956:2010Reference numberISO 13956:2010(E)ISO 2010INTERNATIONAL STANDARD ISO13956First edition2010-10-01Plastics pipes and fittings Decohesion te
5、st of polyethylene (PE) saddle fusion joints Evaluation of ductility of fusion joint interface by tear test Tubes et raccords en matires plastiques Essai de dcohsion des selles en polythylne (PE) assembles par soudage valuation de la ductilit de linterface de soudage par essai darrachement BS ISO 13
6、956:2010ISO 13956:2010(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 on the computer performing the editing.
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9、ddress given below. COPYRIGHT PROTECTED DOCUMENT ISO 2010 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 writing from either
10、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 2010 All rights reservedBS ISO 13956:2010ISO 13956
11、:2010(E) ISO 2010 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Principle1 4 Apparatus.1 4.1 General .1 4.2 Tensile test equipment Type A1 or A21 4.3 Compressive equipment Type B .3 4.4 Equipment Type C 3 5 Sampling.4 5.1 Preparation of test pieces.4 5.2 Number
12、of test pieces.5 6 Conditioning 5 7 Procedure.5 8 Test report7 Annex A (informative) Recommended condition.9 Bibliography10 BS ISO 13956:2010ISO 13956:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standa
13、rds bodies (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 organ
14、izations, 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 i
15、n the 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 %
16、 of the 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 13956 was prepared by Technical Committee ISO/TC 138, Plast
17、ics pipes, fittings and valves for the transport of fluids, Subcommittee SC 5, General properties of pipes, fittings and valves of plastic materials and their accessories Test methods and basic specifications. BS ISO 13956:2010INTERNATIONAL STANDARD ISO 13956:2010(E) ISO 2010 All rights reserved 1Pl
18、astics pipes and fittings Decohesion test of polyethylene (PE) saddle fusion joints Evaluation of ductility of fusion joint interface by tear test 1 Scope This International Standard specifies a method for the evaluation of the ductility of the fusion joint interface of assemblies of polyethylene (P
19、E) pipe and electrofusion or heated tool saddles, intended for the conveyance of fluids. 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
20、of the referenced document (including any amendments) applies. ISO 11413, Plastics pipes and fittings Preparation of test piece assemblies between a polyethylene (PE) pipe and an electrofusion fitting 3 Principle A load is applied to the saddle of an assembly of an electrofusion or heated tool saddl
21、e fused on to a pipe. The ductility of the fusion joint interface is characterized by the appearance of the failure in the fusion plane and by the determination of the percentage of decohesion. 4 Apparatus 4.1 General The test apparatus shall comprise a tensile equipment type A1 or A2, as indicated
22、in Figures 1 and 2 respectively, or a compressive equipment type B as indicated in Figure 3. For nominal outside pipe diameter W 250 mm, equipment type C as indicated in Figure 4 may be used. 4.2 Tensile test equipment Type A1 or A2 The tensile equipment shall include the following main parts. 4.2.1
23、 Tensile testing machine, capable of maintaining a speed of (100 10) mm/min, with sufficient force to separate the saddle from the pipe. 4.2.2 Loading pin, with an outside diameter of at least 1/2 of the nominal outside diameter of the pipe and allowing rotation. BS ISO 13956:2010ISO 13956:2010(E) 2
24、 ISO 2010 All rights reserved4.2.3 Appropriate clamping device, to grip the saddle and allow separation from the pipe. NOTE The type A1 clamping device allows symmetrical loading of the saddle from both sides (an example is shown in Figure 1). The type A2 clamping device grips the saddle only from o
25、ne side (an example is shown in Figure 2). 1243Key 1 clamping device 2 PE saddle 3 PE pipe 4 loading pin Figure 1 Typical type A1 test arrangement 1243Key 1 clamping device, allowing rotation of the loading point 2 PE saddle 3 PE pipe 4 loading pin Figure 2 Typical type A2 test arrangement BS ISO 13
26、956:2010ISO 13956:2010(E) ISO 2010 All rights reserved 34.3 Compressive equipment Type B The compression equipment shall include the following main parts. 4.3.1 Compression testing machine, capable of maintaining a speed of (100 10) mm/min, with sufficient force to separate the saddle from the pipe.
27、 4.3.2 Loading pin, with an outside diameter of at least 1/2 of the nominal outside diameter of the pipe. 4.3.3 Appropriate clamping device, to grip or support the saddle and allow separation from the pipe (an example is shown in Figure 3). 1243Key 1 clamping device 2 PE saddle 3 PE pipe 4 loading p
28、in Figure 3 Typical type B compression mode test arrangement 4.4 Equipment Type C The equipment shall include the following main parts. 4.4.1 Tensile testing machine, capable of maintaining a speed of (100 10) mm/min, with sufficient force to separate the saddle from the pipe. 4.4.2 Appropriate clam
29、ping device, to grip or support the saddle and allow separation from the pipe (an example is shown in Figure 4). 4.4.3 Appropriate supporting frame with fixtures, to fix the pipe, next to the saddle, to the supporting frame (an example is shown in Figure 4). BS ISO 13956:2010ISO 13956:2010(E) 4 ISO
30、2010 All rights reserved12435FFKey 1 clamping device 2 PE saddle 3 PE pipe 4 fixture 5 supporting frame F decohesion force Figure 4 Typical type C test arrangement 5 Sampling 5.1 Preparation of test pieces 5.1.1 Pipes and components shall be jointed according to the manufacturers instructions and un
31、der conditions given in the product standard. For PE assemblies, the conditions given in ISO 11413 for electrofusion shall be taken into account. 5.1.2 Unless otherwise specified, the main pipe shall not be perforated. BS ISO 13956:2010ISO 13956:2010(E) ISO 2010 All rights reserved 55.1.3 The free p
32、ipe length on both sides of the saddle shall be minimum 0,1dn(dnbeing the nominal outside pipe diameter). For type C test mode, the free pipe length on both sides of the saddle shall be such that it extends out of the fixtures. 5.1.4 For type C test mode, the pipe shall be cut along the pipe axis, a
33、s indicated in Figure 4. 5.1.5 All screws, bolts and other fixing accessories (such as under-clamp, if any) shall be removed. 5.1.6 For practical reasons, the branch outlet of the saddle may be removed. To facilitate decohesion at the fusion interface, the removal of parts that are not involved in t
34、he fusion joint is allowed. NOTE The pipe wall thickness can influence the magnitude of applied decohesion force. 5.2 Number of test pieces Unless otherwise specified in the referring standard, the number of test pieces shall be three. 6 Conditioning The testing shall be carried out at least 24 h af
35、ter completion of jointing. Condition the test piece at an ambient temperature of (23 2) C for at least 6 h before carrying out the procedure given in Clause 7. 7 Procedure Carry out the following procedure at an ambient test temperature of (23 2) C. a) For type A1, A2 and B test mode, insert the lo
36、ading pin inside the pipe; for type C test mode, fix the pipe directly next to the saddle to the supporting frame. b) Position the test piece and the clamping device such that the saddle is separated from the pipe at a speed of (100 10) mm/min. NOTE 1 An example of the test assembly, using a tensile
37、 test, is given in Figure 1 for type A1 test mode and in Figure 2 for type A2 test mode. An example of the test assembly, using a compression test, is given in Figure 3. An example of type C test assembly is given in Figure 4. c) Continue the loading until complete separation or rupture of one of th
38、e parts of the test piece occurs. If the test piece slips out of the clamps, the test may be continued by repositioning the clamps. For type A2 test mode, repositioning the clamping device on the other side of the saddle is allowed. In case separation cannot be achieved, testing may be carried out a
39、t a lower speed of (25 5) mm/min, for instance. d) Inspect the test piece and record the location of the rupture (e.g. in the pipe or the saddle, between the wires or the fusion interface), the type of rupture, and whether or not a brittle fracture surface is observed. Typical ruptures are character
40、ized in Figures 5 and 6. NOTE 2 It is common practice that, when no separation takes place in the fusion interface (e.g. rupture in the pipe or in the saddle), the test result is considered as 0 % brittle decohesion regarding e), f), g) and h). In this case, an alternative test arrangement of this I
41、nternational Standard (see Figure 1, 2, 3 or 4) can be applied or, for instance, the strip-bend test according to ISO 21751. e) Measure and record the maximum brittle fracture length in radial direction of the fusion zone, l, and the overall length of the fusion zone at the same location, y. BS ISO
42、13956:2010ISO 13956:2010(E) 6 ISO 2010 All rights reservedf) Calculate the percentage decohesion, Ld, using Equation (1): d100 (%)lLy= (1) g) Measure and record the brittle area of the fusion zone (A). h) Calculate the percentage decohesion, Ad, using Equation (2): dnom100 (%)AAA= (2) where Anomis t
43、he theoretical total fusion zone, as declared by the manufacturer or measured on the fitting. 1 243l= yKey 1 pipe surface 2 ductile fracture 3 brittle fracture with no adhesion at fusion interface 4 brittle fracture between electrofusion wires l maximum brittle fracture length y overall length of th
44、e fusion zone Figure 5 Typical brittle fracture at the fusion interface BS ISO 13956:2010ISO 13956:2010(E) ISO 2010 All rights reserved 7123ylKey 1 pipe surface 2 ductile fracture 3 brittle fracture between electrofusion wires l maximum brittle fracture length y overall length of the fusion zone Fig
45、ure 6 Typical ductile fracture in the plane of the wires 8 Test report The test report shall include the following information: a) reference to this International Standard, i.e. ISO 13956:2010; b) full identification of the components tested; c) nominal size of the saddle; d) dimensions of the pipes
46、, including nominal diameter, thickness or SDR, MRS; e) fusion conditions of the test pieces; f) test temperature; g) speed of testing; h) number of test pieces subjected to testing; i) testing mode, tensile (type A1 or A2), compression (type B) or type C, as applicable; j) of each test piece, the t
47、ype of failure, i.e. brittle or ductile, and details of its appearance including, when applicable, decohesion at interface, tearing between wires, yielding of the pipe or saddle. As from LdW 25 % or AdW 12 %, it is recommended to include pictures of the relevant fracture surface; k) percentage decoh
48、esion, Ldand Ad; BS ISO 13956:2010ISO 13956:2010(E) 8 ISO 2010 All rights reservedl) observations made during and after the test; m) any factors which could have affected the results, such as any incidents or any operational details not specified in this International Standard; n) identification of
49、test laboratory; o) date of the test. BS ISO 13956:2010ISO 13956:2010(E) ISO 2010 All rights reserved 9Annex A (informative) Recommended condition It is recommended that the percentage of decohesion for each individual test piece fulfil the following requirement: Ldu 50 % and Adu 25 %. BS ISO 13956:2010ISO 13956:2010(E) 10 ISO 2010 All rights reservedBibliography 1 ISO 21751, Plastics pipes and fittings Determination of cohesive resistance Strip-bend test
