1、April 2010 Translation by DIN-Sprachendienst.English price group 11No part of this translation 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
2、23.040.45!$aM“1626142www.din.deDDIN EN ISO 13967Thermoplastics fittings Determination of ring stiffness (ISO 13967:2009)English translation of DIN EN ISO 13967:2010-04Thermoplastische Formstcke Bestimmung der Ringsteifigkeit (ISO 13967:2009)Englische bersetzung von DIN EN ISO 13967:2010-04Raccords e
3、n matires thermoplastiques Dtermination de la rigidit annulaire (ISO 13967:2009)Traduction anglaise de DIN EN ISO 13967:2010-04www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 19 pages04.10 DIN EN ISO 13967:2010-04 2 A comma is used as t
4、he decimal marker. 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 with Technical Committee CEN/TC 155 “Plastics piping systems and ducting systems” (Secretariat: NEN, Netherlands).
5、 The responsible German body involved in its preparation was the Normenausschuss Kunststoffe (Plastics Standards Committee), Working Committee NA 054-05-02 AA Prfverfahren fr Rohre. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 13967 December 2009 ICS 23.040.45 English Version Thermoplast
6、ics fittings - Determination of ring stiffness (ISO 13967:2009) Raccords en matires thermoplastiques - 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
7、 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 standards may be obtained on appl
8、ication 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 the CEN Management Centre
9、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, Netherlands, Norway, Poland,
10、Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE 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 m
11、eans reserved worldwide for CEN national Members. Ref. No. EN ISO 13967:2009: EContents DIN EN ISO 13967:2010-04 EN ISO 13967:2009 (E) 2 Page Foreword3 1 Scope 4 2 Terms and definitions .4 3 Symbols 6 4 Principle6 5 Apparatus .6 6 Test pieces .7 6.1 Preparation.7 6.2 Number .8 6.3 Determination of d
12、imensions .8 6.4 Age . 10 7 Conditioning 11 8 Test temperature. 11 9 Procedure 11 10 Calculation of ring stiffness 13 11 Test report . 14 Annex A (informative) Comments on the use of this test method 15 Bibliography. 17 Foreword piping systems and ducting systems” the secretariat of which is held by
13、 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 that some o
14、f 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 bound to impleme
15、nt 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, Switzerland an
16、d 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. DIN EN ISO 13967:2010-04 EN ISO 13967:2009 (E) 3 fittings and valves for the transport of fluids” in collaboration with Technical Committee CEN/TC 155 “Plasti
17、cs This document (EN ISO 13967:2009) has been prepared by Technical Committee ISO/TC 138 “Plastics pipes, 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
18、cross-section. The method can be used to determine 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
19、ISO 9969, then, because of its geometry, its stiffness 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 eq
20、ual branch, provided that it has the same main diameter, 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 te
21、sted bend or branch with the largest diameter of that 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 fo
22、llowing terms and definitions apply. 2.1 ring stiffness 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
23、uses a deflection of 3 % as the reference at which 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 di
24、fferentiate the circumferential stiffness or ring 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
25、 that in both cases the stiffness is related to the 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 de
26、flection during testing in accordance with this International Standard DIN EN ISO 13967:2010-04 EN ISO 13967:2009 (E) 4 2.3 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
27、 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 heights, see Figure 1. Figure 1 Typical fitting wall heights, ec2
28、.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, L, depends on the geometry of the fitting, as specified in C
29、lause 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. DIN EN ISO 13967:2010-04 EN ISO 13967:2009 (E) 5 3 Symbols Symbol Description Unit Di Inside diameter of fit
30、ting mm DnNominal 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
31、pieces shall 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 stif
32、fness shall 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
33、 to calculate 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 tr
34、avel to produce 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). I
35、f the fitting 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
36、 the test. The 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
37、 mm. When equal branches are tested without the use of insert plates, the width of the bearing plates shall be (50 1) mm. DIN EN ISO 13967:2010-04 EN ISO 13967:2009 (E) 6 b) Insert plates When insert plates are needed in order to distribute the force equally over the loaded area of the test piece (s
38、ee 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 loadi
39、ng 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 pla
40、tes 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,
41、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 comprise a com
42、plete 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 used (
43、see Figure 2). DIN EN ISO 13967:2010-04 EN ISO 13967:2009 (E) 7 6.2 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 be determined at the defle
44、ction 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
45、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 the length L1+ L2as shown in Figure 3 in which Lsis the spigot length as defined by the ma
46、nufacturer. If Lsis not provided by the manufacturer, it shall be taken as the length Lx. The values of L1, L2and Lsshall be taken from the product drawing provided by the manufacturer or shall be measured from the product. When measured from the product, the values of L1and L2shall be determined to
47、 an accuracy of within 1 % or 1 mm, whichever is the greater. L = L1+ L2aDeflection measurement point. bLength of loading. Figure 3 Calculation length, L, of a bend with a radius u 1,5 times nominal size DIN EN ISO 13967:2010-04 EN ISO 13967:2009 (E) 8 6.3.2.3 Bends with a radius 1,5 times nominal s
48、ize of the bend The calculation length, L, of a bend with a radius 1,5 times nominal size shall be determined in the same way as for bends with a radius u 1,5 times nominal size, except that the following shall be observed: the length of the arc shall be calculated using the dimensions shown in Figu
49、re 4 and Equation (2): 122360RL LL=+ (2) if, in a bend with a radius 1,5 times nominal size, it is impracticable to measure the change in inside diameter at the mid-point of the body, the average value of the change in inside diameter at two other points each at /3 from the mid-point may be taken (see Figure 4). Key angle of fitting, in degrees aAlternative deflection measurement point. bNormal deflection measurement point. cLength of loading. Figure 4 Calculation length, L, of a bend with a radius 1,5 times nominal size DIN EN ISO 13967
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