1、BSI Standards PublicationBS EN ISO 9969:2016Thermoplastics pipes Determination of ring stiffnessBS EN ISO 9969:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 9969:2016.It supersedes BS EN ISO 9969:2007 which is withdrawn.The UK participation in its pre
2、paration 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 necessaryprovisions of a contract. Users are responsible for its
3、correctapplication. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 81163 0ICS 23.040.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Stra
4、tegy Committee on 31 January 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 9969 January 2016 ICS 23.040.20 Supersedes EN ISO 9969:2007English Version Thermoplastics pipes - Determination of ring stiffness (ISO
5、9969:2016) Tubes en matires thermoplastiques - Dtermination de la rigidit annulaire (ISO 9969:2016) Thermoplastische Rohre - Bestimmung der Ringsteifigkeit (ISO 9969:2016) This European Standard was approved by CEN on 7 November 2015. CEN members are bound to comply with the CEN/CENELEC Internal Reg
6、ulations 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-CENELEC Management Centre or to any CEN mem
7、ber. 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-CENELEC Management Centre has the same status as the official versions.
8、CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland
9、, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in
10、 any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 9969:2016 EBS EN ISO 9969:2016EN ISO 9969:2016 (E) 3 European foreword This document (EN ISO 9969:2016) has been prepared by Technical Committee ISO/TC 138 “Plastics pipes, fittings and valves for the transport o
11、f 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 latest b
12、y July 2016, and conflicting national standards shall be withdrawn at the latest by July 2016. 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 patent
13、 rights. This document supersedes EN ISO 9969:2007. 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland
14、, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO
15、9969:2016 has been approved by CEN as EN ISO 9969:2016 without any modification. BS EN ISO 9969:2016ISO 9969:2016(E)Foreword iv1 Scope . 12 Normative references 13 Symbols 14 Principle 15 Apparatus . 26 Test pieces . 36.1 Marking and number of test pieces . 36.2 Length of test pieces . 36.3 Inside d
16、iameter of test piece(s) 46.4 Age of test pieces . 47 Conditioning 58 Procedure. 59 Calculation of ring stiffness . 710 Test report . 8 ISO 2016 All rights reserved iiiContents PageBS EN ISO 9969:2016ISO 9969:2016(E)ForewordISO (the International Organization for Standardization) is a worldwide fede
17、ration 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 established has the right to be represented on that commi
18、ttee. 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 standardization.The procedures used to develop this document and
19、 those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part
20、 2 (see www.iso.org/directives).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 such patent rights. Details of any patent rights identified during the development of the
21、 document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms
22、 and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 138, Plastics pipes, fittings
23、 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 third edition cancels and replaces the second edition (ISO 9969:2007), which has been technically revise
24、d.iv ISO 2016 All rights reservedBS EN ISO 9969:2016INTERNATIONAL STANDARD ISO 9969:2016(E)Thermoplastics pipes Determination of ring stiffness1 ScopeThis International Standard specifies a test method for determining the ring stiffness of thermoplastics pipes having a circular cross section.2 Norma
25、tive referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) a
26、pplies.ISO 3126, Plastics piping systems Plastics components Determination of dimensions3 SymbolsFor the purposes of this document, the following symbols apply.Unitsdnnominal diameter of pipe mmdiinside diameter of the test piece of pipe mmecconstruction height mmF loading force kNF0pre-load force N
27、L length of test piece mmp pitch of ribs or windings mmS ring stiffness kN/m2y vertical deflection mm4 PrincipleThe ring stiffness is determined by measuring the force and the deflection while deflecting the pipe at a constant deflection speed.A cut length of pipe supported horizontally is compresse
28、d 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 calculated as a function of the force necessary to produce a 3 % diametric deflection of the pipe.NOTE It is a
29、ssumed that the test temperature is set by the referring standard, if appropriate (see 8.1). ISO 2016 All rights reserved 1BS EN ISO 9969:2016ISO 9969:2016(E)5 Apparatus5.1 Compressive testing machine, capable of a constant rate of crosshead movement, via a pair of parallel plates (5.2), as appropri
30、ate to the nominal diameter of the pipe in conformance with Table 1, with sufficient force and travel to produce the specified diametric deflection (see Clause 8).Table 1 Deflection speedsInside diameter, di, of the test piece of pipe mmDeflection speed mm/mindi 100 2 0,1100 710 0,03 di 5 %dishall b
31、e determined in accordance with 6.3.5.2 A pair of hard and rigid plates, through which 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 suffi
32、cient to prevent bending or deformation to an extent that would affect the results.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 Dim
33、ensional measuring devices, capable of determining individual values for the length of a test piece (see 6.2.2 and 6.2.3) to with an accuracy of 1 mm, the inside diameter of a test piece to with an accuracy of 0,5 %, and the change of inside diameter of a test piece in the direction of loading with
34、an accuracy of 0,1 mm or 1 % of the deflection, whichever is the greater.An example of a device for measuring the inside diameter of corrugated pipe is shown in Figure 1.Figure 1 Example of device for measuring inside diameter of corrugated pipe5.4 Force measuring device, capable of determining with
35、 an accuracy of 2 % the force necessary to produce a deflection of up to 4 % of the test piece.2 ISO 2016 All rights reservedBS EN ISO 9969:2016ISO 9969:2016(E)6 Test pieces6.1 Marking and number of test piecesThe pipe of which the ring stiffness is to be determined shall be marked on its outside wi
36、th a line along 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 pieces6.2.1 The length of each test pi
37、ece shall be 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 measur
38、ements shall 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 measurementsNominal diameter, dn, of pipe mmNumber of length measurementsdn 200 3200 dn 500
39、 4dn 500 66.2.2 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 0,2 dn.6.2.4 Struc
40、tured 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 the te
41、st 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, 0,2 dnor greater.See Figure 2. ISO 2016 All rights reserved 3BS EN ISO 9969:2016ISO 9969:2016(E)KeyL length of test piecep pitchFigure
42、 2 Test piece cut out of perpendicularly ribbed pipe6.2.5 Structured wall pipes with helical ribs, corrugations or other regular structures shall be cut such that the length of the test pieces is equal to the inside diameter 20 mm but not less than 290 mm nor greater than 1 000 mm.6.3 Inside diamete
43、r of test piece(s)The inside diameters, dia, diband dic, of the respective test pieces, a, b and c (see 6.1), shall be determined either asa) the arithmetic average of four or more measurements in accordance with ISO 3126 of one cross section at mid-length, where each measurement shall be determined
44、 with an accuracy of 0,5 %, orb) 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 dia, diband dic, respectively.The average value, di, of these three calculate
45、d values shall be calculated using Formula (1):ddddiia ib ic3=+(1)6.4 Age of test piecesAt the start of testing in accordance with Clause 8, the age of the test pieces shall be at least 24 h.For type testing, and in case of dispute, the age of the test pieces shall be (21 2) days.4 ISO 2016 All righ
46、ts reservedBS EN ISO 9969:2016ISO 9969:2016(E)7 ConditioningThe test pieces shall be conditioned in air at the test temperature (see 8.1) for at least 24 h immediately prior to testing in accordance with Clause 8.8 Procedure8.1 Unless otherwise specified in the referring standard, carry out the foll
47、owing procedure at (23 2) C or, in countries where 27 C is used as standard laboratory temperature, at (27 2) C.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
48、 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 or split line is in contact with the upper parallel plate.In the loading device, rotate the two other test pieces, b and c, respe
49、ctively 120 and 240 in relation to the position of the first test piece when placing them in their loading devices.8.3 For each test piece, attach the deflection gauge and check the angular position of the test piece in relation to the upper plate.Position the test piece with its longitudinal axis parallel to the plates and with its middle point vertically under the centre-line of the load cell.In order to obtain the correct reading from the load cell, it is necessary to position the test piece so the
