1、BRITISH STANDARDBS EN ISO 2505:2005Thermoplastics pipes Longitudinal reversion Test method and parametersThe European Standard EN ISO 2505:2005 has the status of a British StandardICS 23.040.20g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g
2、40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 2505:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 5 December 2005 BSI 5 December 2005ISBN 0 580 47367 8National forewordThis British
3、 Standard is the official English language version of EN ISO 2505:2005. It is identical with ISO 2505:2005. It supersedes BS EN 743:1995 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee PRI/88, Plastic piping systems, to Subcommittee PRI/88/4, Method of
4、 tests for plastic piping systems and components, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this doc
5、ument may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract.
6、 Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for ch
7、ange, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii and iii, a blank pag
8、e, pages 1 to 5 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 2505 May 2005 ICS 23.040.20 Supersedes EN 743:1994 Englis
9、h version Thermoplastics pipes - Longitudinal reversion - Test method and parameters (ISO 2505:2005) Tubes en matires thermoplastiques - Retrait longitudinal chaud - Mthode dessai et paramtres (ISO 2505:2005) Rohre aus Thermoplasten - Lngsschrumpf - Prfverfahren und Kennwerte (ISO 2505:2005) This Eu
10、ropean Standard was approved by CEN on 12 May 2005. 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 bibliographical references con
11、cerning such national standards may be obtained on application to the Central Secretariat 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 ow
12、n language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembo
13、urg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exp
14、loitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 2505:2005: EEN ISO 2505:2005Foreword This document (EN ISO 2505:2005) has been prepared by Technical Committee ISO/TC 138 “Plastics pipes, fittings and valves for the transport of fluids“ in collabora
15、tion 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 November 2005, and
16、conflicting national standards shall be withdrawn at the latest by November 2005. This document supersedes EN 743:1994. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium,
17、Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 2505:2005 h
18、as been approved by CEN as EN ISO 2505:2005 without any modifications. Reference numberISO 2505:2005(E)INTERNATIONAL STANDARD ISO2505Second edition2005-05-15Thermoplastics pipes Longitudinal reversion Test method and parametersTubes en matires thermoplastiques Retrait longitudinal chaud Mthode dessa
19、i et paramtres EN ISO 2505:2005ii iiiForeword 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 technical committees. Each member body
20、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 closely with the International Electrotech
21、nical 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. Draft International Standards adopted by t
22、he 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 document may be the subject of patent right
23、s. ISO shall not be held responsible for identifying any or all such patent rights. ISO 2505 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, fittings and valves of plastic materials and t
24、heir accessories Test methods and basic specifications. This second edition cancels and replaces ISO 2505-1:1994 and ISO 2505-2:1994, of which it constitutes a technical revision. EN ISO 2505:2005blank1Thermoplastics pipes Longitudinal reversion Test method and parameters 1 Scope This International
25、Standard specifies a method for determining the longitudinal reversion of thermoplastics pipes, to be carried out in either a liquid or in air. In case of dispute, heated liquid is used as the reference. This International Standard is applicable to all thermoplastics pipes with smooth internal and e
26、xternal walls of constant cross-section. It is not applicable to non-smooth structured-wall thermoplastics pipes. The parameters appropriate to the pipe material and recommendations for the maximum levels of reversion as a function of the pipe material are given in Annex A. NOTE Measurement of longi
27、tudinal reversion is not considered relevant for pipe wall thickness greater than 16 mm. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition
28、of the referenced document (including any amendments) applies. ISO 1043-1, Plastics Symbols and abbreviated terms Part 1: Basic polymers and their special characteristics 3 Abbreviations The abbreviations used for the plastic materials are as specified in ISO 1043-1. The following abbreviations are
29、used in this International Standard. ABS acrylonitrile/butadiene/styrene PA polyamide (nylon) ASA acrylonitrile/styrene/acrylate PB polybutene PE 32/40 polyethylene MRS 3,2/4 PE 50/63 polyethylene MRS 5/6,3 PE 80/100 polyethylene MRS 8/10 PE-X cross-linked polyethylene PVC-C chlorinated poly(vinyl c
30、hloride) PVC-U unplasticized poly(vinyl chloride) PVC-HI high-impact poly(vinyl chloride) SAN + PVC styrene/acrylonitrile plus poly(vinyl chloride) EN ISO 2505:20052 PP-H polypropylene homopolymer PP-B polypropylene block copolymer PP-R polypropylene random copolymer 4 Principle A pipe of specified
31、length is placed in a liquid bath or air oven at a specified temperature for a specified time . A marked length of this portion of pipe is measured, under identical conditions, before and after heating. The reversion is calculated as a percentage of the change in length in relation to the initial le
32、ngth. The surface appearance of the test piece shall not be changed after heating. 5 Apparatus 5.1 Heated liquid bath, thermostatically controlled at the temperature, TR, as specified in Table 1, unless otherwise specified by a referring standard. The volume and agitation of the bath shall be such t
33、hat the temperature remains within the specified temperature range when the test piece is immersed. The liquid chosen should be stable at the specified temperature and should not otherwise affect the plastics material. NOTE Glycerine, glycol, mineral oil free from aromatic hydrocarbons, or a solutio
34、n of calcium chloride are suitable, but any other liquid in line with these recommendations can be used. 5.2 Air oven, thermostatically controlled such that it operates at the temperature, TR, as specified in Table 1, unless otherwise specified, and capable of re-establishing this temperature within
35、 15 min of the introduction of the test pieces. The oven shall be equipped with a thermostat capable of maintaining TRto a permissible deviation of 2 C. 5.3 Ancillary equipment 5.3.1 Device to hold the test piece(s) within the heating bath or oven in accordance with Clause 7. 5.3.2 Thermometer, with
36、 an accuracy to within 0,5 C. 6 Preparation 6.1 Test piece Immediately after extrusion, the sample of pipe to be tested shall be stored at (23 2) C, or conditioning in accordance with 6.2 shall commence. If the test is carried out immediately after production of the pipe, a pessimistic result may be
37、 obtained. In case of dispute, carry out the test at least 24 h after production and storage at (23 2) C. Take as a test piece a pipe (200 20) mm long. Using, for example, a scriber, trace on this test piece two circumferential marks 100 mm apart, corresponding to the test area, at equal distances f
38、rom the two ends. Prepare a total of three similar test pieces per pipe sample. Pipes of diameter 250 mm or larger may be cut into four even segments for production of test pieces. EN ISO 2505:20053Table 1 Parameters for the determination using a liquid bath or air oven Thermoplastics material aTemp
39、erature of bath or air oven TRDuration of exposure Length of test piece C min mm PVC-U 150 2 PVC-C 150 2 PVC-HI 150 2 SAN+PVC 150 2 PA 150 + 2 (air oven only) PE 32/40 100 2 PE 50/63 PE 80/100 110 2 PE-X 120 2 PB 110 2 PP-H et PP-B 150 2 PP-R 135 2 ABS et ASA 150 2 For liquid bath: 15 for e u 8 30 f
40、or 8 e u 16 For air oven: 60 for e u 8 120 for 8 e u 16 200 20 e mean wall thickness, in millimetres. aSymbols in accordance with ISO 1043-1.6.2 Conditioning Condition the test pieces at (23 2) C for a period of time according to the wall thickness of the pipe as follows: W 1 h, for e 3 mm W 3 h, fo
41、r 3 mm u e 8 mm W 6 h, for 8 mm u e u 16 mm where e is the mean wall thickness in millimetres. 7 Procedure At a temperature of (23 2) C, measure the distance L0between the marks to within 0,25 mm. Set the temperature of the heating bath or air oven to the temperature TR, as specified in Table 1, unl
42、ess otherwise specified. Suspend the test pieces allowing free movement in the heating bath or air oven so that they touch neither the walls nor the base of the bath or oven, and in the case of the bath so that there is a minimum distance of 30 mm between the upper boundary of the test area (see 6.1
43、) and the fluidair interface. Alternatively the test piece may be supported providing this does not inhibit reversion. Leave the test pieces for the duration specified in Table 1, unless otherwise specified. Maintain the specified test temperature in the zone between the circumferential marks on the
44、 test piece. EN ISO 2505:20054 Remove the test pieces from the bath or oven and allow them to hang freely in the same position. After they have cooled to (23 2) C, measure the maximum and minimum distance, L, between marks (diametrically opposed), following any curvature of the marked surfaces. 8 Ex
45、pression of results For each test piece, calculate the longitudinal reversion, RL,i, as a percentage, using the following equation: L,0100iLRL= where L = L0 L; L0is the distance between the marks before the immersion, in millimetres; L is the distance between the marks after the immersion, measured
46、along the generatrices, in millimetres. Choose those measurements of L which give the greatest value of L, with L being either positive or negative. When the test piece has been cut into four even segments (see 6.1), the longitudinal reversion of the test piece, RL,i,is calculated as the average of
47、the three highest of the four results. Calculate, as the value for the longitudinal reversion RLof the pipe, the arithmetic mean of the values obtained for each of the three test pieces. 9 Test report The test report shall include the following information: a) reference to this International Standar
48、d; b) full identification of the pipe; c) the nature of the heating fluid used; d) the duration of the test and the temperature TRof the bath or oven; e) the change in length of each test pipe L, indicating whether it is positive or negative; f) any change in the appearance of the test pieces during
49、 the immersion, or immediately afterwards, for example, bubbles or cracking; g) the value of the longitudinal reversion RLof the pipe, calculated in accordance with Clause 8; h) all operating details not specified in this method, as well as any incidents likely to have influenced the results; i) the date of the test. EN ISO 2505:20055Annex A (informative) Recommended basic specifications for longitudinal reversion Using either a liquid bath or an air oven, the calculated value of the long
