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1、BRITISH STANDARD BS EN ISO 9969:2007 Thermoplastics pipes Determination of ring stiffness The European Standard EN ISO 9969:2007 has the status of a British Standard ICS 23.040.20 ? Licensed Copy: London South Bank University, London South Bank University, Fri Feb 15 06:41:30 GMT+00:00 2008, Uncontr
2、olled Copy, (c) BSI BS EN ISO 9969:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2008 BSI 2008 ISBN 978 0 580 56932 6 National foreword This British Standard is the UK implementation of EN ISO 9969:2007. It supersedes BS EN
3、ISO 9969:1995 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee PRI/88, Plastics piping systems, to Subcommittee PRI/88/4, Test methods. A list of organizations represented on this committee can be obtained on request to its secretary. This publication
4、does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication DateComments Licensed Copy: London South Bank Un
5、iversity, London South Bank University, Fri Feb 15 06:41:30 GMT+00:00 2008, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 9969 December 2007 ICS 23.040.20Supersedes EN ISO 9969:1995 English Version Thermoplastics pipes - Determination of ring stiffness (ISO 9969
6、:2007) Tubes en matires thermoplastiques - Dtermination de la rigidit annulaire (ISO 9969:2007) Thermoplastische Rohre - Bestimmung der Ringsteifigkeit (ISO 9969:2007) This European Standard was approved by CEN on 7 December 2007. CEN members are bound to comply with the CEN/CENELEC Internal Regulat
7、ions 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 application to the CEN Management Centre or to any CEN member. This Eu
8、ropean 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 has the same status as the official versions. CEN members are the
9、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, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland
10、and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2007 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO
11、 9969:2007: E Licensed Copy: London South Bank University, London South Bank University, Fri Feb 15 06:41:30 GMT+00:00 2008, Uncontrolled Copy, (c) BSI Foreword This document (EN ISO 9969:2007) has been prepared by Technical Committee ISO/TC 138 “Plastics pipes, fittings and valves for the transport
12、 of fluids“ in collaboration with Technical Committee CEN/TC 155 “Plastics piping systems and ducting systems“, the secretariat of which 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 lates
13、t by June 2008, and conflicting national standards shall be withdrawn at the latest by June 2008. Attention is drawn to the possibility 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 pat
14、ent rights. This document supersedes EN ISO 9969:1995. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, Fran
15、ce, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 9969:2007 has been approved by CEN as a EN ISO 9969:2
16、007 without any modification. BS EN ISO 9969:2007 Licensed Copy: London South Bank University, London South Bank University, Fri Feb 15 06:41:30 GMT+00:00 2008, Uncontrolled Copy, (c) BSI Reference number ISO 9969:2007(E) INTERNATIONAL STANDARD ISO 9969 Second edition 2007-12-15 Thermoplastics pipes
17、 Determination of ring stiffness Tubes en matires thermoplastiques Dtermination de la rigidit annulaire BS EN ISO 9969:2007 Licensed Copy: London South Bank University, London South Bank University, Fri Feb 15 06:41:30 GMT+00:00 2008, Uncontrolled Copy, (c) BSI ii Licensed Copy: London South Bank Un
18、iversity, London South Bank University, Fri Feb 15 06:41:30 GMT+00:00 2008, Uncontrolled Copy, (c) BSI iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is no
19、rmally 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 organizations, governmental and non-governmental, in liaison with ISO, also take part in
20、 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 in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepa
21、re 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 % of the member bodies casting a vote. Attention is drawn to the possibility that so
22、me 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 9969 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee SC 5, Gener
23、al properties of pipes, fittings and valves of plastic materials and their accessories Test methods and basic specifications. This second edition cancels and replaces the first edition (ISO 9969:1994), which has been technically revised. BS EN ISO 9969:2007 Licensed Copy: London South Bank Universit
24、y, London South Bank University, Fri Feb 15 06:41:30 GMT+00:00 2008, Uncontrolled Copy, (c) BSI blank Licensed Copy: London South Bank University, London South Bank University, Fri Feb 15 06:41:30 GMT+00:00 2008, Uncontrolled Copy, (c) BSI 1 Thermoplastics pipes Determination of ring stiffness 1 Sco
25、pe This International Standard specifies a test method for determining the ring stiffness of thermoplastics pipes having a circular cross section. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition
26、cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3126, Plastics piping systems Plastics components Determination of dimensions 3 Symbols For the purposes of this document, the following symbols apply. Units dn nominal diamet
27、er of pipe mm di inside diameter of pipe mm ec construction height mm F force (of loading) kN L length of the test piece mm p pitch of ribs or windings mm S ring stiffness kN/m2 y vertical deflection mm 4 Principle The ring stiffness is determined by measuring the force and the deflection while defl
28、ecting the pipe at a constant deflection speed. A cut length of pipe supported horizontally is compressed vertically between two parallel flat plates moved at a constant speed that is dependent upon the diameter of the pipe. A plot of force versus deflection is generated. The ring stiffness is calcu
29、lated as a function of the force necessary to produce a 3 % diametric deflection of the pipe. NOTE It is assumed that the test temperature is set by the referring standard, if appropriate (see 8.1). BS EN ISO 9969:2007 Licensed Copy: London South Bank University, London South Bank University, Fri Fe
30、b 15 06:41:30 GMT+00:00 2008, Uncontrolled Copy, (c) BSI 2 5 Apparatus 5.1 Compressive testing machine, capable of a constant rate of crosshead movement, via a pair of parallel plates (5.2), as appropriate to the nominal diameter of the pipe in conformance with Table 1, with sufficient force and tra
31、vel to produce the specified diametric deflection (see Clause 8). Table 1 Deflection speeds Nominal diameter, dn, of pipe mm Deflection speed mm/min dn u 100 100 710 2 0,1 5 0,25 10 0,5 20 1 0,03 di 5 % a a di shall be determined in accordance with 6.3. 5.2 A pair of hard and rigid plates, through w
32、hich the testing machine can apply the necessary force, F, to the test piece. The plates shall have flat, smooth and clean surfaces for contact with the test piece. The stiffness and hardness of each plate shall be sufficient to prevent bending or deformation to an extent that would affect the resul
33、ts. The length of each plate shall be at least equal to the length of the test piece. The width of each plate shall not be less than the width of the contact surface with the test piece while under load plus 25 mm. 5.3 Dimensional measuring devices, capable of determining individual values for the l
34、ength of a test piece (see 6.2.2 and 6.2.3) to within 1 mm, the inside diameter of a test piece to within 0,5 %, and the change of inside diameter of a test piece in the direction of loading with an accuracy of 0,1 mm or 1 % of the deflection, whichever is the greater. An example of a device for mea
35、suring the inside diameter of corrugated pipe is shown in Figure 1. Figure 1 Example of device for measuring inside diameter of corrugated pipe 5.4 Force measuring device, capable of determining to within 2 % the force necessary to produce a deflection of up to 4 % of the test piece. BS EN ISO 9969:
36、2007 Licensed Copy: London South Bank University, London South Bank University, Fri Feb 15 06:41:30 GMT+00:00 2008, Uncontrolled Copy, (c) BSI 3 6 Test pieces 6.1 Marking and number of test pieces The pipe of which the ring stiffness is to be determined shall be marked on its outside with a line alo
37、ng one generatrix over its entire length. Three test pieces, a, b and c, respectively, shall be taken from this marked pipe such that the ends of the test pieces are perpendicular to the pipe axis and their lengths conform to 6.2. 6.2 Length of test pieces 6.2.1 The length of each test piece shall b
38、e determined by calculating the arithmetic average of three to six measurements of length equally spaced around the perimeter of the pipe, as given in Table 2. The length of each test piece shall conform to 6.2.2, 6.2.3, 6.2.4 or 6.2.5, as applicable. Each of the three to six length measurements sha
39、ll be determined to within 1 mm. For each individual test piece, the smallest of the three to six measurements shall not be less than 0,9 times the largest length measurement. Table 2 Number of length measurements Nominal diameter, dn, of pipe mm Number of length measurements dn u 200 3 200 dn 500 4
40、 dn W 500 6 6.2.2 For pipes that have nominal diameters equal to or less than 1 500 mm, the average length of the test pieces shall be (300 10) mm. 6.2.3 For pipes that have nominal diameters larger than 1 500 mm, the average length of the test pieces in millimetres shall be at least 0,2dn. 6.2.4 St
41、ructured wall pipes with perpendicular ribs, corrugations or other regular structures shall be cut such that each test piece contains a whole number of ribs, corrugations or other structures. The cuts shall be made at the mid point between the ribs, corrugations or other structures. The length of th
42、e test pieces shall be the minimum whole number of ribs, corrugations or other structures resulting in a length of 290 mm or greater or, for pipes greater than 1 500 mm, 0,2dn or greater. See Figure 2. BS EN ISO 9969:2007 Licensed Copy: London South Bank University, London South Bank University, Fri
43、 Feb 15 06:41:30 GMT+00:00 2008, Uncontrolled Copy, (c) BSI 4 Key L test piece length p pitch Figure 2 Test piece cut out of perpendicularly ribbed pipe 6.2.5 Structured wall pipes with helical ribs, corrugations or other regular structures shall be cut such that the length of the test pieces is equ
44、al to the inside diameter 20 mm but not less than 290 mm nor greater than 1 000 mm. 6.3 Inside diameter of test piece(s) The inside diameters, dia, dib and dic, of the respective test pieces, a, b and c (see 6.1), shall be determined either as a) the arithmetic average of four measurements at 45 int
45、ervals of one cross section at mid-length, where each measurement shall be determined to within 0,5 %, or b) measured at mid-length cross-section by means of a tape in accordance with ISO 3126. The calculated or measured average inside diameter for each test piece, a, b and c, shall be recorded, as
46、dia, dib and dic, respectively. The average value, di, of these three calculated values shall be calculated using Equation (1): iaibic i 3 ddd d + = (1) 6.4 Age of test pieces At the start of testing in accordance with Clause 8, the age of the test pieces shall be at least 24 h. For type testing, an
47、d in case of dispute, the age of the test pieces shall be (21 2) days. BS EN ISO 9969:2007 Licensed Copy: London South Bank University, London South Bank University, Fri Feb 15 06:41:30 GMT+00:00 2008, Uncontrolled Copy, (c) BSI 5 7 Conditioning The test pieces shall be conditioned in air at the tes
48、t temperature (see 8.1) for at least 24 h immediately prior to testing in accordance with Clause 8. 8 Procedure 8.1 Unless otherwise specified in the referring standard, carry out the following procedure at (23 2) C or, in countries where 27 C is used as standard laboratory temperature, at (27 2) C.
49、 In case of dispute, (23 2) C shall be used. NOTE It is probable that the test temperature has an influence on the ring stiffness. 8.2 If it can be determined in which position the test piece has the lowest ring stiffness, place the first piece, a, in this position in the loading device. Otherwise, place the first test piece in such a way that the marking line is in contact with the upper parallel plate. In the loading device, rotate the two o