1、BRITISH STANDARD BS ISO 13953:2001 Polyethylene (PE) pipes and fittings Determination of the tensile strength and failure mode of test pieces from a butt-fused joint ICS 23.040.20; 23.040.45 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS ISO 13953:2001 This British Standard
2、, having been prepared under the direction of the Sector Policy and Strategy Committee for Materials and Chemicals, was published under the authority of the Standards Policy and Strategy Committee on 15 November 2001 BSI 15 November 2001 ISBN 0 580 38350 4 National foreword This British Standard rep
3、roduces verbatim ISO 13953:2001 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee PRI/88, Plastic Piping Systems, to Subcommittee PRI/88/4, Test Methods, which has the responsibility to: A list of organizations represented on
4、this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Ind
5、ex”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself c
6、onfer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promu
7、lgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, ISO title page, page ii to iv, page 1 to 5 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No
8、. Date CommentsINTERNATIONAL STANDARD ISO 13953 First edition 2001-09-15 Reference number ISO 13953:2001(E) Polyethylene (PE) pipes and fittings Determination of the tensile strength and failure mode of test pieces from a butt-fused joint Tubes et raccords en polythylne (PE) Dtermination de la rsist
9、ance en traction et du mode de rupture dprouvettes prleves dans des assemblages par soudage bout boutISO 13953:2001(E) ii DPF discliamer This FDP feli amy ctnonia ededdebm tyfep.seca In aroccecnad tiwh Asebod gnisnecil ycilop, thsi feli may be pritnde ro eivwde but sllah ton eb tideed sselnu teh tyf
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12、ley evtne ttah a pborlme talerign to ti si f,dnuo saelpe ifnrom teh tneClar Stercearita ta the serddas givne olebw. ISO 1002 llA rithgs rresev.de Unless torehiwse sficep,dei on rapt of tihs buptacilion may be rperdecudo ro tuilidez in any form ro by nay m,snae ele-c trinoc or m,lacinahce gnidulcni t
13、ohppocoyign dna cimrfo,mli tiwtuoh repminoiss ni rwitgni fmor eitreh ISO at teh serddas olebw ro ISOs mme- reb ydob in the cuotnry fo the rtseuqeer. ISO cporythgi fofiec esaC tsopael 65 1121-HC Geneva 02 Te.l + 41 22 947 10 11 Fax + 14 22 479 09 47 E-liam copyrightsio.ch Web wwwsi.oc.h Prdetni in Sz
14、tiwerldnaISO 13953:2001(E) iii Contents Page 1 Scope . 1 2 Normative reference . 1 3 Principle 1 4 Apparatus . 1 5 Test pieces 2 6 Conditioning 4 7 Procedure . 4 8 Test report 5ISO 13953:2001(E) iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of nationa
15、l standards 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. Internation
16、al organizations, 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
17、 given in the ISO/IEC Directives, Part 3. 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 possi
18、bility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 13953 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves f
19、or 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.INTERNATIONAL STANDARD ISO 13953:2001(E) 1 Polyethylene (PE) pipes and fittings Determination of the tensile strength and f
20、ailure mode of test pieces from a butt-fused joint 1 Scope This International Standard describes a test method for determination of the tensile strength and tensile failure mode of butt-fused polyethylene (PE) pipe assemblies. The method is applicable to butt-fused joints between PE pipes with a nom
21、inal outside diameter of not less than . The method may be used, together with other test methods, to evaluate the quality of the butt-fused joints. 2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this Interna
22、tional Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the normative document in
23、dicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 11414:1996, Plastics pipes and fittings Preparation of polyethylene (PE) pipe/pipe or pipe/fitting test p
24、iece assemblies by butt fusion. 3 Principle A test piece machined from a butt-fused PE pipe joint to give a waisted section is subjected to a tensile stress at constant speed. When loading the test piece in a tensile-testing machine, the stress is concentrated through the jointed region and ultimate
25、 failure is in the vicinity of the joint. The failure mode and tensile strength are used as criteria for the evaluation of the butt-fused joint. The test is carried out at a temperature of . 4A p p a r a t u s 4.1 Room, which can be controlled at a temperature of . 4.2 Tensile-testing machine, capab
26、le of sustaining between its clamping jaws a constant speed of , and equipped with means for recording the consequent applied force, and a device to detect test piece failure. 4.3 Clamping device, equipped with bars fitting into traction holes machined in the test piece. 4.4 Measuring devices, capab
27、le of determining the width and thickness of the test piece to within (see 7.1). 4.5 Template with the geometry of the test piece (see Figures 1 and 2), to mark the shape of the test piece to be machined. 90 mm 23 C 2 C 23 C 2 C 5 mm/min 1 mm/min 0,05 mmISO 13953:2001(E) 2 5 Test pieces 5.1 Sampling
28、 The pipes used to produce the test piece shall be obtained by sampling as specified in the product standard. 5.2 Preparation 5.2.1 General The butt-fused PE pipe joints shall be prepared in accordance with the manufacturers instructions or the instructions specified in the relevant standards (e.g.
29、ISO 11414). For each test piece required, a strip shall be machined out along the longitudinal direction of the pipe, across the joint. The strip shall be further machined to prepare a test piece with dimensions conforming to: a) Table 1 and Figure 1 for pipes with wall thickness (type A); b) Table
30、1 and Figure 2 for pipes with wall thickness (type B); using a template to ensure that the joint interface will be aligned with the cross-section of the centre of the waist of the test piece of type A or type B, as applicable. The fusion beads may be removed. 5.2.2 Type A test piece The dimensions a
31、nd shape of the type A test piece shall conform to Figure 1 and Table 1. Figure 1 Machined type A tensile test piece (for ) e 25 mm e25 mmISO 13953:2001(E) 3 The “waist” of the test piece shall be formed by drilling or machining holes with their centres or apart, as applicable, so that the centrelin
32、es of the holes lie in the same plane as the joint interface, and then cutting towards the holes from the corresponding edge of the strip. The faces of the test piece waist shall be smooth. The finish of the remaining edges is not critical. 5.2.3 Type B test piece The dimensions and shape of the typ
33、e B test piece shall conform to Table 1 and Figure 2. Table 1 Dimensions of type A and B test pieces Dimensions in millimetres Symbol Description Dimensions of type A test piece Dimensions of type B test piece Overall length (min.) 180 180 250 Width at ends Length of narrow parallel-sided portion No
34、t applicable Not applicable Width of narrow portion Radius Initial distance between grips Thickness Full wall thickness Full wall thickness Full wall thickness Diameter of the traction holes Figure 2 Machined type B tensile test piece (for ) d n 6 160 d n 160 A B 6038 0 3 100 3 C 25 1 D 2512 5 12 5
35、1 E 5 0,5 10 0,5 25 1 G 9059 0 5 165 5 H I 2052 0 53 0 5 35 mm 45 mm e 25 mmISO 13953:2001(E) 4 5.3 Number of test pieces The number of test pieces shall depend upon the nominal outside diameter of the pipe, as given in Table 2. One test piece shall be taken at the position of maximum misalignment.
36、The other test pieces shall be taken uniformly around the circumference of the joint. 6 Conditioning Immediately prior to testing in accordance with clause 7, condition each test piece in air for a minimum of at a temperature of , starting the period of conditioning at a time such that testing will
37、not be carried out less than after the butt fusion of the joint. 7 Procedure 7.1 Measure the thickness of the test piece as the thickness of the pipe wall and the width of the test piece as the distance between the two holes drilled at the joint ( ) for test pieces of type A (see Table 1 and Figure
38、1) or as the width of the narrow portion ( ) for test pieces of type B (see Table 1 and Figure 2). 7.2 Place the test piece in the clamping device of the tensile-testing machine, so that the direction of the force applied to the test piece is perpendicular to the butt-fusion joint. 7.3 Apply tension
39、 to the test piece with a cross-head speed of . 7.4 Record the force applied during extension until complete failure of the test piece. 7.5 Record the maximum force applied (in newtons) and the type of failure as ductile or brittle, as characterized by the ductile and brittle failure modes shown in
40、Figure 3. Only failures at the butt-fusion joint shall be taken into account. 7.6 Calculate the tensile strength as the maximum recorded tensile force (in newtons) divided by the cross- sectional area of the centre of the test piece (i.e. width thickness, as measured in accordance with 7.1, in squar
41、e millimetres). Table 2 Number of test pieces Nominal outside diameter Number of test pieces 2 4 6 7 d n d n mm 906d n 110 1106d n 180 1806d n 315 3156d n 6h 23 C 2 C 24 h D D 5 mm/min 1 mm/min ISO 13953:2001(E) 5 8 Test report The test report shall include the following information: a) a reference
42、to this International Standard and the referring standard; b) all details necessary for identification of the test pieces, including the nominal size of the pipes used to produce the test pieces, the type of material, the manufacturers code and the fusion procedure used; c) the test piece type (A or
43、 B), whether the fusion bead was removed or not and the number of test pieces tested; d) the test temperature; e) the type of failure for each test piece; f) the tensile strength for each test piece; g) observations made during the test; h) any factors that may have affected the results, such as any
44、 incidents or any operating details not specified in this International Standard; i) the test laboratory; j) thed ateofth ete st. Figure 3 Typical example of ductile failure mode (left-hand picture) and brittle failure mode (right-hand picture)BS ISO 13953:2001 BSI 389 Chiswick High Road London W4 4
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