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)BS EN ISO 13967:2009 BRITISH STANDARDNational forewordThis British Standard is the UK i
2、mplementation 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 committee can beobtained on request to its secretary.This publication does not purport to include all the
3、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 obligations.This British Standard was published under the authority of theStandards Policy and Strategy
4、Committee on 31 July 2010.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME 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 -
5、Dtermination dela rigidit annulaire (ISO 13967:2009) Thermoplastische Formstcke - Bestimmung der Ringsteifigkeit (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 f
6、or giving this European Standard the status of a national standard without any alteration. Up-to-date 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 offic
7、ial 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 the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria,
8、 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, Switzerland and United Kingdom. EUROPEAN COMMITTE
9、E FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: 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: EBS EN ISO 13967:2009EN I
10、SO 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 w
11、hich 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 possibil
12、ity 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 b
13、ound 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,
14、 Switzerland 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. BS EN ISO 13967:2009ISO 13967:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Terms and definitions .1 3 Symbols3
15、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 stiffness .10 11 Test report11 Annex A (informative) Comments on the use of this test method.12 Bibliogr
16、aphy14 BS EN ISO 13967:2009ISO 13967:2009(E) iv ISO 2009 All rights reservedForeword ISO (the International 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
17、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, also take part in the work. ISO collaborates clo
18、sely 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 committees is to prepare International Standards. Dra
19、ft 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 possibility that some of the elements of this docu
20、ment may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such 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, fittin
21、gs and valves of plastic materials and their accessories Test methods and basic specifications. This second edition cancels and replaces the first edition (ISO 13967:1998), which has been technically revised. BS EN ISO 13967:2009INTERNATIONAL STANDARD ISO 13967:2009(E) ISO 2009 All rights reserved 1
22、Thermoplastics 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
23、 the stiffness 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 stiff
24、ness can 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 dia
25、meter, 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 t
26、hat reducer. 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 stif
27、fness 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
28、 to determine 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
29、stiffness 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 th
30、e resistance 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 In
31、ternational Standard BS 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 deflection, y, expressed as a percentage of the inside diameter, Di, of the fitting NOTE Percent defle
32、ction 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 heights, see Figure 1. Figure 1 Typical fitting wall heights, ec2.6 calculation length L externa
33、l 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, L, depends on the geometry of the fitting, as specified in Clause 6. See Figures 3, 4 and 5
34、. 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. BS EN ISO 13967:2009ISO 13967:2009(E) ISO 2009 All rights reserved 33 Symbols Symbol Description Unit Di Inside diameter of fitting mm DnNo
35、minal diameter of fitting mm ec Height of fitting wall mm F Force N L Calculation length mm S Calculated ring 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
36、 be compressed across their diameter at a constant rate of deflection between two parallel plates. Force versus 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
37、be calculated as a function of the force necessary to produce a 3 % diametric deflection of the fitting. NOTE 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 calculat
38、e the stiffness uses the length of the body and not the overall length of the fitting. 5 Apparatus 5.1 Compression 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 prod
39、uce the specified diametric deflection via a pair of bearing plates. 5.2 Bearing plates, capable of transferring 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 fittin
40、g has a ribbed or structured wall construction, the plates shall make initial contact only with the top(s) of 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. T
41、he geometry of the plates shall be such that the force is equally distributed over the loaded area of the test 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 eq
42、ual branches are tested without the use of insert plates, the width of the bearing plates shall be (50 1) mm. BS 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 p
43、iece (see 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 withou
44、t loading 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 ins
45、ert plates 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 lo
46、ading, to 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 compris
47、e 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 plates adapted to the geometry of the fitting may be
48、 used (see Figure 2). BS EN ISO 13967:2009ISO 13967:2009(E) ISO 2009 All rights reserved 56.2 Number The test shall be carried out on three test pieces. They shall be marked “a”, “b” and “c”. 6.3 Determination of dimensions 6.3.1 Inside diameter The vertical inside diameter of each test piece shall
49、be determined at the deflection measurement point (which is at the mid-point of the overall length of the body) (see Figures 3, 4 and 5) to an accuracy of within 0,2 % or 0,1 mm, whichever is the greater. 6.3.2 Calculation length of bends 6.3.2.1 General The method of determining the calculation length, L, of a bend depends on its bending radius at the centre line. 6.3.2.2 Bends with a radius u 1,5 times nominal size of the bend The calculation length, L, of a bend with a radius u 1,5 times the nominal size shall be determined as t
