1、July 2016 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 23.040.20!%XLF“2534135www.din.deDIN
2、 EN ISO 9967Thermoplastics pipes Determination of creep ratio (ISO 9967:2016);English version EN ISO 9967:2016,English translation of DIN EN ISO 9967:2016-07Thermoplastische Rohre Bestimmung des Verformungsverhaltens (ISO 9967:2016);Englische Fassung EN ISO 9967:2016,Englische bersetzung von DIN EN
3、ISO 9967:2016-07Tubes en matires thermoplastiques Dtermination du taux de fluage (ISO 9967:2016);Version anglaise EN ISO 9967:2016,Traduction anglaise de DIN EN ISO 9967:2016-07SupersedesDIN EN ISO 9967:2008-02www.beuth.deDocument comprises 19 pagesDTranslation by DIN-Sprachendienst.In case of doubt
4、, the German-language original shall be considered authoritative.07.16 DIN EN ISO 9967:2016-07 2 A comma is used as the decimal marker. National foreword This document (EN ISO 9967:2016) has been prepared by Technical Committee ISO/TC 138 “Plastics pipes, fittings and valves for the transport of flu
5、ids” in collaboration with Technical Committee CEN/TC 155 “Plastics piping systems and ducting systems” (Secretariat: NEN, Netherlands). The responsible German body involved in its preparation was DIN-Normenausschuss Kunststoffe (DIN Standards Committee Plastics), Working Committee NA 054-05-02 AA P
6、rfverfahren fr Rohre. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 3126 DIN EN ISO 3126 ISO 9969 DIN EN ISO 9969 Amendments This standard differs from DIN EN ISO 9967:2008-02 as follows: a) the standard has been editorially revised;
7、b) Clause 2 “Normative references” has been included; c) Clause 3 “Symbols” has been extended; d) Table 1 has been modified; e) for calculating the pre-load force according to Formula (2), the inside diameter of the pipe test piece instead of the nominal outside diameter of the pipe is to be used. P
8、revious editions DIN EN ISO 9967: 1995-08, 2008-02 National Annex NA (informative) Bibliography DIN EN ISO 3126, Plastics piping systems Plastics components Determination of dimensions DIN EN ISO 9969, Thermoplastics pipes Determination of ring stiffness EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE
9、NORM EN ISO 9967 January 2016 ICS 23.040.20 Supersedes EN ISO 9967:2007English Version Thermoplastics pipes - Determination of creep ratio(ISO 9967:2016) Tubes en matires thermoplastiques - Dtermination du taux de fluage (ISO 9967:2016) Thermoplastische Rohre - Bestimmung des Verformungsverhaltens (
10、ISO 9967:2016) This European Standard was approved by CEN on 7 November 2015. 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 lists and bibl
11、iographical references concerning such national standards may be obtained on application to the CEN-CENELEC 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 respon
12、sibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Repu
13、blic 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 United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMA
14、LISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 9967:2016 EEuropean foreword .3Introduction 51 Scope . 62 Normative r
15、eferences 63 Symbols 64 Principle 75 Apparatus . 76 Test pieces . 86.1 Marking and number of test pieces . 86.2 Length of test pieces . 86.3 Inside diameter of test piece(s) 96.4 Age of test pieces . 97 Conditioning 98 Test procedure 99 Determination of the creep ratio 1110 Test report . 14Annex A (
16、informative) Creep in thermoplastics material .15Bibliography .17Contents PageDIN EN ISO 9967:2016-07 EN ISO 9967:2016 (E) 2Foreword .4European foreword This document (EN ISO 9967:2016) has been prepared by Technical Committee ISO/TC 138 “Plastics pipes, fittings and valves for the transport of flui
17、ds“ 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 by July
18、 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 right
19、s. This document supersedes EN ISO 9967:2007. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound
20、to implement this European Standard: 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, Portugal,
21、Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 9967:2016 has been approved by CEN as EN ISO 9967:2016 without any modification. DIN EN ISO 9967:2016-07 EN ISO 9967:2016 (E)3 ForewordISO (the International Organization for St
22、andardization) 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 established has the rig
23、ht 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 standardization.The procedures
24、 used to develop this document and 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 rul
25、es of the ISO/IEC Directives, Part 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 identi
26、fied during the development of the 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
27、 the meaning of ISO specific terms 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 IS
28、O/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 third edition cancels and replaces the second edition (ISO 9967:2007),
29、 which has been technically revised.DIN EN ISO 9967:2016-07 EN ISO 9967:2016 (E) 4 IntroductionExperience shows that when a pipe is installed in the soil in accordance with an appropriate code of practice an increase in deflection may be observed. Depending on the soil and installation conditions th
30、is period will vary but normally not exceed two years.Therefore, the two-year creep ratio as determined in accordance with this International Standard is intended for use when long-term static calculations are carried out.The theory of creep in thermoplastics materials is briefly explained in Annex
31、A.For experiments, the test can be carried out based on other ages of the test pieces, other test temperatures and/or other test durations.DIN EN ISO 9967:2016-07 EN ISO 9967:2016 (E)5 1 ScopeThis International Standard specifies a method for determining the creep ratio of thermoplastics pipes havin
32、g a circular cross-section.2 Normative 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 doc
33、ument (including any amendments) applies.ISO 3126, Plastics piping systems Plastics components Determination of dimensions3 SymbolsUnitdnnominal diameter of pipe mmdiinside diameter of test piece of pipe mmF loading force kNF0pre-load force Np pitch mmL length of test piece mmy0measured initial defl
34、ection mmYtcalculated deflection at time t mmY2extrapolated two-year deflection mm vertical deflection used to determine the loading force mmB theoretical deflection, at t = 1 h mmM gradient coefficientN number of points on the deflection curve used for the linear regressionR correlation coefficient
35、t time hx log(t)y measured total deflection mm creep ratioDIN EN ISO 9967:2016-07 EN ISO 9967:2016 (E) 6 S stiffness kN/m2E modulus of elasticity of the material kN/m2I moment of inertia m3D mean diameter of the test ring m4 PrincipleA cut length of pipe is placed between two parallel flat horizonta
36、l plates and a constant compressive force is applied for 1 008 h (42 days).The deflection of the pipe is recorded at specified intervals so as to prepare a plot of pipe deflection against time. The linearity of the data are analysed and the creep ratio is calculated as the ratio between the two year
37、s extrapolated deflection value and the measured 6 min (0,1 h) deflection.NOTE It is assumed that the test temperature, as appropriate (see 8.1), is set by the referring standard.5 Apparatus5.1 Compressive loading machine, capable of applying via plates (5.2) and maintaining to with a precision of 1
38、 % both the applicable pre-load force, F0(see 8.4), and the necessary loading force, F (see 8.5), on the pipe.The force may be applied either directly or indirectly, e.g. by use of a lever arm arrangement.5.2 Two plates, through which the compressive force can be applied to the test piece. The plate
39、s shall be flat, smooth and clean and shall not deform during the test 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 be not less than the maximum width of the contact surface with the test pi
40、ece while under load plus 25 mm.5.3 Dimensional measuring devices, capable of determining: individual values for the length of a test piece (see 6.2) to with an accuracy of 1 mm; the inside diameter of a test piece to with an accuracy of 0,1 mm or 0,2 % di, whichever is the greater; the change in in
41、side diameter of a test piece in the direction of loading with an accuracy of 0,1 mm or 0,1 % of the deflection, whichever is the greater.The change in inside diameter may be measured inside the pipe or be determined from the movement of the upper plate. In case of dispute the inside diameter shall
42、be used as reference.An example of a device for measuring the inside diameter of corrugated pipes is shown in Figure 1.Figure 1 Example of device for measuring the inside diameter of a corrugated pipeDIN EN ISO 9967:2016-07 EN ISO 9967:2016 (E)7 5.4 Timer, capable of determining the first 6 min with
43、 an accuracy to within 1 s and the remaining times to within 0,1 % (see 8.5 and 8.6).6 Test pieces6.1 Marking and number of test piecesThe pipe of which the creep ratio is to be determined shall be marked on its outside with a line along one generatrix for its full length. Three test pieces, A, B an
44、d 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 piece shall be determined by calculating the arithmetic average of three to six meas
45、urements of length equally spaced around the perimeter of the pipe as given in Table 1. 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 shall be determined to within 1 mm.For each individual test piece, the small
46、est of the three to six measurements shall not be less than 0,9 times the largest length measurement.Table 1 Number of length measurementsNominal diameter, dn, of pipeNumber of length measurementsmmdn 200 3200 dn 500 4dn 500 66.2.2 For pipes that have a nominal diameter, dn, less than or equal to 1
47、500 mm, the average length of the test pieces shall be (300 10) mm.6.2.3 For pipes that have a nominal diameter, dn, larger than 1 500 mm, the average length of the test pieces in millimetres shall be at least 0,2 dn.6.2.4 Structured wall pipes with perpendicular ribs, corrugations or other regular
48、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 test pieces shall be the minimum whole number of ribs, corrugations or other structures resulting in a length of 290 mm or greater, or 0,2
