1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 13967:2009Thermoplastics fittings Determination of ring stiffness(ISO 13967:2009)Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 15/10/2010 03:44, Uncontrolled C
2、opy, (c) BSIBS EN ISO 13967:2009 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO13967:2009.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/88/4, Test Methods - Plastic Piping.A list of organizations represented on this committ
3、ee can beobtained on request to its 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 57754 3ICS 23.040.45Compliance with a British Standard cannot confer immunity fromlegal oblig
4、ations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 July 2010.Amendments issued since publicationDate Text affectedLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 15/10/2010 03:44, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD NORME
5、 EUROPENNE EUROPISCHE NORM EN ISO 13967 December 2009 ICS 23.040.45 English Version Thermoplastics fittings - Determination of ring stiffness (ISO 13967:2009) Raccords en matires thermoplastiques - Dtermination dela rigidit annulaire (ISO 13967:2009) Thermoplastische Formstcke - Bestimmung der Rings
6、teifigkeit (ISO 13967:2009) This European Standard was approved by CEN on 14 December 2009. 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
7、lists and bibliographical references concerning such national standards 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
8、responsibility of a CEN member into its own language and notified to the 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, Hungar
9、y, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, 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:
10、 Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 13967:2009: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 15/10/2010 03:44, Uncontrolled Copy, (c) BSIBS EN ISO 13967:2009EN ISO
11、13967:2009 (E) 3 Foreword This document (EN ISO 13967:2009) 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 systems” the secretariat of whic
12、h 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 June 2010, and conflicting national standards shall be withdrawn at the latest by June 2010. Attention is drawn to the possibility
13、 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. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are boun
14、d 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, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Sw
15、itzerland and the United Kingdom. Endorsement notice The text of ISO 13967:2009 has been approved by CEN as a EN ISO 13967:2009 without any modification. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 15/10/2010 03:44, Uncontrolled Copy, (c) BSIBS EN ISO 13967:2009ISO 13967:2009(E) ISO 2009
16、All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Terms and definitions .1 3 Symbols3 4 Principle3 5 Apparatus.3 6 Test pieces .4 6.1 Preparation.4 6.2 Number .5 6.3 Determination of dimensions.5 6.4 Age 7 7 Conditioning 8 8 Test temperature .8 9 Procedure.8 10 Calculation of ring stiffnes
17、s .10 11 Test report11 Annex A (informative) Comments on the use of this test method.12 Bibliography14 Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 15/10/2010 03:44, Uncontrolled Copy, (c) BSIBS EN ISO 13967:2009ISO 13967:2009(E) iv ISO 2009 All rights reservedForeword ISO (the Internation
18、al Organization for Standardization) is a worldwide federation of national 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 e
19、stablished has the right to be represented on that committee. International 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 standard
20、ization. International Standards are drafted in accordance with the rules given in 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 vo
21、ting. Publication as an International Standard requires approval by at least 75 % 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 su
22、ch patent rights. ISO 13967 was prepared by Technical Committee ISO/TC 138, Plastics 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. This seco
23、nd edition cancels and replaces the first edition (ISO 13967:1998), which has been technically revised. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 15/10/2010 03:44, Uncontrolled Copy, (c) BSIBS EN ISO 13967:2009INTERNATIONAL STANDARD ISO 13967:2009(E) ISO 2009 All rights reserved 1Thermo
24、plastics fittings Determination of ring stiffness 1 Scope This International Standard specifies a method of determining the ring stiffness of bends and branches made from thermoplastic material and for use with plastics pipes having a circular cross-section. The method can be used to determine the s
25、tiffness of bends, equal branches and unequal branches, provided the fitting allows a diametric deflection of at least 4 %. NOTE 1 If a fitting has the same wall thickness, wall construction, material and diameter as a pipe tested according to ISO 9969, then, because of its geometry, its stiffness c
26、an be equal to or greater than that of the pipe. In this case, the fitting can be classified as having the same stiffness class as the pipe, without testing. NOTE 2 Any unequal branch can be expected to have at least the same stiffness as an equal branch, provided that it has the same main diameter,
27、 wall construction and material as the equal branch. NOTE 3 A reducer having the same wall thickness, wall construction and material in the transition zone as a tested bend or branch can be expected to have at least the same stiffness as the tested bend or branch with the largest diameter of that re
28、ducer. NOTE 4 The result of the test reflects the resistance the fitting has against deflection when installed. Advice on the significance of the test result is given in Annex A. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 ring stiffness
29、S mechanical characteristic of a fitting, which is a measure of the resistance to diametric deflection under an external force applied between two parallel planes, as determined in accordance with this International Standard NOTE 1 This method uses a deflection of 3 % as the reference at which to de
30、termine this characteristic. NOTE 2 Throughout this International Standard, the term “ring stiffness” is used. In ISO 9969 that describes a method of determining the stiffness of a plastics pipe; the word “ring” is appropriate and is used to differentiate the circumferential stiffness or ring stiffn
31、ess from the axial stiffness or longitudinal stiffness. The pipe test pieces have the shape of rings. Although fittings do not have the shape of rings, to emphasize the relationship between this International Standard and ISO 9969 and to stress that in both cases the stiffness is related to the resi
32、stance of the product to diametric deflection, the word “ring” has been retained in this International Standard for the determination of the stiffness of fittings. 2.2 compressive force compressive load F force applied to cause the diametric deflection during testing in accordance with this Internat
33、ional Standard Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 15/10/2010 03:44, Uncontrolled Copy, (c) BSIBS EN ISO 13967:2009ISO 13967:2009(E) 2 ISO 2009 All rights reserved2.3 diametric deflection y change in diameter caused by a compressive force 2.4 percent deflection diametric deflectio
34、n, y, expressed as a percentage of the inside diameter, Di, of the fitting NOTE Percent deflection is expressed as Equation (1): i100yD (1) 2.5 fitting wall height ecoverall thickness of the wall of a fitting, measured across the entire cross-section of the wall NOTE For examples of fitting wall hei
35、ghts, see Figure 1. Figure 1 Typical fitting wall heights, ec2.6 calculation length L external free length of a fitting, excluding sockets, spigots, inlet zones and half of the transition zones between body and sockets, measured along a line parallel to the fitting axis NOTE 1 The calculation length
36、, L, depends on the geometry of the fitting, as specified in Clause 6. See Figures 3, 4 and 5. NOTE 2 The length of loading is normally slightly shorter than the calculation length. This difference has no significant influence on the result of the test. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA ST
37、ANDARDS, 15/10/2010 03:44, Uncontrolled Copy, (c) BSIBS EN ISO 13967:2009ISO 13967:2009(E) ISO 2009 All rights reserved 33 Symbols Symbol Description Unit Di Inside diameter of fitting mm DnNominal diameter of fitting mm ec Height of fitting wall mm F Force N L Calculation length mm S Calculated rin
38、g stiffness kN/m2Sa Ring stiffness of test piece “a” N/m2Sb Ring stiffness of test piece “b” N/m2Sc Ring stiffness of test piece “c” N/m2y diametric deflection mm 4 Principle Test pieces shall be compressed across their diameter at a constant rate of deflection between two parallel plates. Force ver
39、sus deflection data shall be generated. The force shall be applied as a load distributed along the body of the fitting without loading the spigot(s) and/or socket(s). The ring stiffness shall be calculated as a function of the force necessary to produce a 3 % diametric deflection of the fitting. NOT
40、E As fittings are normally installed with socket and spigot connections, creating zones of high stiffness, the load is only applied to the body of the fitting and the equation used to calculate the stiffness uses the length of the body and not the overall length of the fitting. 5 Apparatus 5.1 Compr
41、ession testing machine, capable of a constant rate of crosshead movement appropriate to the nominal diameter of the fitting in accordance with Table 1, with sufficient force and travel to produce the specified diametric deflection via a pair of bearing plates. 5.2 Bearing plates, capable of transfer
42、ring the force and movement of the test machine (5.1) to the test piece and comprising a pair of bearing plates alone or in combination with insert plates as described in 5.2 b). If the fitting has a ribbed or structured wall construction, the plates shall make initial contact only with the top(s) o
43、f the ribs or structures (see Figure 2). a) Bearing plates The plates shall be flat and clean. The stiffness of the plates shall be sufficient to prevent them from deforming during the test. The geometry of the plates shall be such that the force is equally distributed over the loaded area of the te
44、st piece when the test piece is compressed over the length of loading (see Figures 3, 4 and 5), e.g. by means of insert plates. The width of the bearing plates shall be at least 50 mm. When equal branches are tested without the use of insert plates, the width of the bearing plates shall be (50 1) mm
45、. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 15/10/2010 03:44, Uncontrolled Copy, (c) BSIBS EN ISO 13967:2009ISO 13967:2009(E) 4 ISO 2009 All rights reservedb) Insert plates When insert plates are needed in order to distribute the force equally over the loaded area of the test piece (see
46、 Figures 3, 4 and 5), they shall be flat and clean. The stiffness of the plates shall be sufficient to prevent them from deforming during the test. The geometry of the plates shall be appropriate to the type of fitting and shall be such that the force is applied evenly to the fitting without loading
47、 the socket(s) and/or spigot(s). The width of the plates shall be at least 50 mm. When equal branches are tested, the width shall be (50 1) mm. Key 1 bearing plate 2 injection-moulding point 3 insert plate aDeflection measurement point. Figure 2 Typical positioning of bearing plates and insert plate
48、s for various constructions 5.3 Dimension-measuring instruments, capable of determining the following dimensions: the individual values of the lengths defined in 6.3, to within 1 mm; the inside diameter of the test piece, to within 0,5 %; the change in inside diameter in the direction of loading, to
49、 an accuracy of within 0,1 mm or 1 % of the deflection, whichever is the greater. 5.4 Force-measuring instrument, capable of determining, to within 2 %, the force necessary to cause diametric deflection of the test piece up to 4 %. 6 Test pieces 6.1 Preparation Each test piece shall comprise a complete fitting with its attachments, such as retaining caps or rings. To improve the linearity of the test curve, small protrusions on the fitting which would come into contact with the deflection plates may be removed. Alternatively, insert pl
