www bzfxw com BRITISH STANDARD BS EN 743 1995 BS 2782 11 Methods 1102A and 1102B 1995 Plastics piping and ducting systems — Thermoplastics pipes — Determination of the longitudinal reversion The Europ[.]
BRITISH STANDARD Plastics piping and ducting systems — Thermoplastics pipes — Determination of the longitudinal reversion The European Standard EN 743:1994 has the status of a British Standard BS EN 743:1995 BS 2782-11: Methods 1102A and 1102B:1995 BS EN 743:1995 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/61, Plastics piping systems and components, upon which the following bodies were represented: British Gas plc British Plastics Federation British Plumbing Fittings Manufacturers’ Association British Valve and Actuator Manufacturers’ Association Department of the Environment (British Board of Agrément) Department of the Environment (Building Research Establishment) Department of the Environment (Property and Buildings Directorate) Department of Transport Electricity Association Federation of Civil Engineering Contractors Health and Safety Executive Institute of Building Control Institute of Materials Institution of Civil Engineers Institution of Gas Engineers Institution of Water and Environmental Management National Association of Plumbing, Heating and Mechanical Services Contractors Pipeline Industries Guild Plastics Land Drainage Manufacturers’ Association Society of British Gas Industries Society of British Water Industries Water Companies Association Water Services Association of England and Wales The following bodies were also represented in the drafting of the standard, through subcommittees and panels: This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 July 1995 © BSI 03-1999 The following BSI references relate to the work on this standard: Committee reference PRI/61 Draft for comment 92/41381 DC ISBN 580 24230 Association of Consulting Engineers Engineering Equipment and Materials Users’ Association Institution of Mechanical Engineers RAPRA Technology Ltd Water Research Centre Amendments issued since publication Amd No Date Comments BS EN 743:1995 Contents Page Committees responsible Inside front cover National foreword ii Foreword Scope Method A Determination of reversion using a liquid bath 3 Method B Determination of reversion in air © BSI 03-1999 i BS EN 743:1995 National foreword This British Standard has been prepared by Technical Committee PRI/61 and is the English language version of EN 743:1994 Plastics piping and ducting systems — Thermoplastics pipes — Determination of the longitudinal reversion, published by the European Committee for Standardization (CEN) It is incorporated into BS 2782 Methods of testing plastics: Part 11: Thermoplastics pipes, fittings and valves, as Methods 1102A and 1102B:1994 It is a revision of BS 2782-11:Method 1102A:1981 and of BS 2782-11:Method 1102B:1981, which are both withdrawn The principal changes with respect to the 1981 editions of Methods 1102A and 1102B are as follows a) The minimum overall length of the test piece has been reduced from 300 mm to 200 mm (the gauge length remains 100 mm) b) For pipes of nominal diameter of 400 mm or larger, the test piece may be cut longitudinally into four or more even segments A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application Compliance with a British Standard does not of itself confer immunity from legal obligations Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages to and a back cover This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover ii © BSI 03-1999 EUROPEAN STANDARD EN 743 NORME EUROPÉENNE January 1994 EUROPÄISCHE NORM UDC 621.643.2-036.073:620.1:539.37 Descriptors: Plastics pipes, plastic tubes, thermoplastic resins, high temperature tests, determination, dimensional stability, reversion English version Plastics piping and ducting systems — Thermoplastics pipes — Determination of the longitudinal reversion Systèmes de canalisations et de gaines plastiques — Tubes thermoplastiques — Détermination du retrait longitudinal chaud Kunststoff-Rohrleitungs- und Schutzrohrsysteme — Rohre aus Thermoplasten — Bestimmung des Längsschrumpfes ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ This European Standard was approved by CEN on 1994-01-10 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 concerning 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 own language and notified to the Central Secretariat has the same satus as the official versions CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 1994 Copyright reserved to CEN members Ref No EN 743:1994 E EN 743:1994 Foreword This European Standard was prepared by CEN/TC 155, Plastics piping systems and ducting systems, and is based on the International Standard ISO 3478:1975, Polypropylene (PP) pipes — Determination of longitudinal reversion, prepared by the International Organization for Standardization (ISO) It is a modification of ISO 3478 for reasons of applicability to other plastics materials and/or other test conditions and alignment with texts of other standards on test methods The provisions of the following international standards or draft international standards have also been taken into account ISO 2505:1981, Unplasticized polyvinyl chloride (PVC) pipes — Longitudinal reversion — Test methods and specification ISO 2506:1981, Polyethylene (PE) pipes — Longitudinal reversion — Test methods and specification ISO/DP 4438, Chlorinated polyvinyl chloride (PVC-C) pipes — Determination of longitudinal reversion The modifications are: — no material is mentioned; — test parameters, except those common to all thermoplastics, are omitted; — no material-dependent or performance requirements are given; — editorial changes have been introduced The material-dependent parameters and/or performance requirements are incorporated in the System Standard(s) concerned No existing European Standard is superseded by this standard This standard is one of a series of standards on test methods which support System Standards for plastics piping systems and ducting systems In accordance with the Common CEN/CENELEC Rules, the following countries are bound to implement this European Standard Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ © BSI 03-1999 EN 743:1994 Scope This European Standard specifies two methods for determining the longitudinal reversion of cylindrical thermoplastics pipes with smooth surfaces It provides test methods to be carried out in liquid (method A) or in air (method B) 2.1 Principle A pipe of given length is immersed in an inert liquid maintained at a specified temperature for a specified duration of immersion (see note) A marked length on this pipe is measured under identical conditions before and after immersion The reversion is calculated as the percentage change in length in relation to the initial length NOTE It is assumed that the following test parameters are set by the standard making reference to this standard: a) the test temperature, TR (see 2.2.1 and 2.5.2); b) the length of the test piece (see 2.3); c) the duration of the immersion, with limiting values (see 2.5.4) Condition the test pieces for at least h at (23 ± 2) °C 2.5.1 Measure at (23 ± 2) °C the distance, L0, between the marks to within 0,25 mm 2.5.2 Establish the temperature of the heating medium at the specified temperature, (TR ± 2) °C 2.5.3 Suspend the test pieces vertically in the heated medium, so that they not touch either the walls or the base of the bath 2.5.4 Leave the test pieces immersed for the specified duration 2.5.5 Remove the test pieces from the bath and keep them suspended in a hanging position until cooled to (23 ± 2) °C Measure, under identical conditions to those used for 2.5.1, the distance, L, between the marks along the maximum and minimum generatrices (diametrically opposed), following any curvature of the surfaces as applicable ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 2.2.1 Heating bath, thermostatically controlled at the specified temperature, TR The volume and agitation of the bath shall be such that the temperature of the liquid in the test piece zone remains within the permissible deviations of the specified temperature, when the test piece is immersed The liquid chosen shall be stable at the specified temperature and shall not otherwise affect the plastics material NOTE Glycerine, glycol, mineral oil free from aromatic hydrocarbons, or a solution of calcium chloride are often suitable but other liquids meeting the requirements specified may be used 2.2.2 Spacing device, to hold the test piece(s) within the heating medium (see 2.5.3) 2.2.3 Thermometer, graduated in increments of not more than 0,5 °C 2.3 Test pieces 2.3.1 Take as a test piece a length of pipe of minimum 200 mm unless otherwise specified in the referring standard [see item b) of the note to 2.1] 2.3.2 Using, e.g a scriber, make on the test piece at (23 ± 2) °C two circumferential marks 100 mm apart, so that each mark is at least 10 mm from the nearest end of the test piece © BSI 03-1999 2.4 Conditioning 2.5 Procedure Method A Determination of reversion using a liquid bath 2.2 Apparatus 2.3.3 Prepare a total of three such test pieces per pipe For pipes of nominal diameter of 400 mm or larger, the test piece may be cut longitudinally into four or more even segments 2.6 Expression of results 2.6.1 For each test piece, or its segments, if applicable (see 2.3.3), calculate the longitudinal reversion, RL, as a percentage using the following equation: R L = VL - × 100 L0 where VL = L0 – L; L0 is the distance between the marks before the immersion, in millimetres (see 2.5.1); L is the distance between the marks after the immersion, in millimetres (see 2.5.5) where L is obtained as follows: Choose for the test piece or its segments, as applicable, those measurements of L which give the greatest value of VL where VL can be positive or negative 2.6.2 Calculate, as the value for the longitudinal reversion of the pipe, the arithmetic mean, RL,m, of the values obtained for each of the three test pieces EN 743:1994 2.7 Test report 3.3 Test pieces The test report shall include the following information: a) a reference to this standard and to the referring standard; b) full identification of the pipe; c) a reference to method A together with the nature of the heating medium used; d) the conditioning details, including temperature, time and medium; e) the temperature, TR, of the bath; f) the change in length of each test piece, VL, together with its sign ( + or – ); g) any changes in the appearance of the test pieces during the immersion, or immediately afterwards, e.g bubbles and cracks; h) the longitudinal reversion of the pipe, RL,m, calculated in accordance with 2.6.2; i) any factors which may have affected the results, such as any incidents or any operating details not specified in this standard; j) the date of test 3.3.1 Take as a test piece a length of pipe of minimum 200 mm unless otherwise specified in the referring standard (see item b) of the note in 3.1) 3.3.2 Using, e.g a scriber, make on the test piece at (23 ± 2) °C two circumferential marks 100 mm apart, so that each mark is at least 10 mm from the nearest end of the test piece 3.3.3 Prepare a total of three such test pieces per pipe For pipes of nominal diameter of 400 mm or larger, the test piece may be cut longitudinally into four or more even segments Method B Determination of reversion in air 3.1 Principle A pipe of given length is placed in an oven at a specified temperature for a specified duration (see note) A marked length of this pipe is measured under identical conditions before and after heating in the oven The reversion is calculated as the percentage variation in length in relation to the initial length NOTE It is assumed that the following test parameters are set by the standard making reference to this standard: a) the test temperature, TR (see 3.2.1 and 3.5.2); b) the length of the test piece (see 3.3.1); c) the duration of exposure, with limiting values (see 3.5.4) 3.2 Apparatus 3.2.1 Air oven, thermostatically controlled, of a heating power such that it operates at the specified temperature, TR, and is capable of re-establishing this temperature within 15 after the introduction of the test pieces The oven shall be equipped with a thermostat capable of maintaining the temperature, TR, with permissible deviations of ± °C 3.2.2 Thermometer, graduated in increments of not more than 0,5 °C 3.4 Conditioning Condition the test pieces for at least h at (23 ± 2) °C 3.5 Procedure 3.5.1 Measure, at (23 ± 2) °C, the distance, L0, between the two marks to within 0,25 mm 3.5.2 Establish the oven temperature at the specified temperature, (TR ± 2) °C 3.5.3 After the oven temperature has stabilized, place the test pieces in the oven so that they not touch the sides or the bottom of the oven If the test pieces are suspended, choose a point of suspension at the end furthest from the reference marks If the test pieces are placed horizontally on a support, e.g a glass plate, use for the support surface a layer of talc or another material that does not inhibit the reversion of the test piece(s) 3.5.4 Maintain the test pieces in the oven for the specified duration, where that duration shall be measured from the time when the temperature of the oven has returned to the specified temperature (see 3.2.1) 3.5.5 Remove the test pieces from the oven and keep them horizontal or suspended, as applicable, until cooled by exposure to the air to (23 ± 2) °C Measure, under identical conditions to those used for 3.5.1 the distance, L, between the marks along the maximum and minimum generatrices (diametrically opposed), following any curvature of the surfaces if applicable ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 3.6 Expression of results 3.6.1 For each test piece, or its segments, if applicable (see 3.3.3), calculate the longitudinal reversion, RL, as a percentage using the following equation: R L = VL - × 100 L0 where VL = L0 – L; © BSI 03-1999 EN 743:1994 L0 is the distance between the marks before the immersion, in millimetres (see 3.5.1); L is the distance between the marks after the immersion, in millimetres (see 3.5.5) where L is obtained as follows: Choose for the test piece or its segments, as applicable, those measurements of L which give the greatest value of VL where VL can be positive or negative 3.6.2 Calculate, as the value for the longitudinal reversion of the pipe, the arithmetic mean, RL,m, of the values obtained for each of the three test pieces 3.7 Test report The test report shall include the following information: a) a reference to this standard and to the referring standard; b) full identification of the pipe; c) a reference to method B, together with the oven temperature, TR; d) the conditioning details, including temperature, time and medium; e) the change in length of each test piece, VL, together with its sign ( + or – ); f) any changes in the appearance of the test pieces during the exposure in the oven, or immediately afterwards, e.g bubbles and cracks; g) the longitudinal reversion of the pipe, RL,m, calculated in accordance with 3.6.2; h) any factors which may have affected the results, such as any incidents or any operating details not specified in this standard; i) the date of test ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ © BSI 03-1999 BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI Ð British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our products and services We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover Tel: 020 8996 9000 Fax: 020 8996 7400 BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services Tel: 020 8996 9001 Fax: 020 8996 7001 In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service Various BSI electronic information services are also available which give details on all its products and services Contact the Information Centre Tel: 020 8996 7111 Fax: 020 8996 7048 ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards For details of these and other benefits contact Membership Administration Tel: 020 8996 7002 Fax: 020 8996 7001 Copyright Copyright subsists in all BSI publications BSI also holds the copyright, in the UK, of the publications of the international standardization bodies Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means ± electronic, photocopying, recording or otherwise ± without prior written permission from BSI This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained If permission is granted, the terms may include royalty payments or a licensing agreement Details and advice can be obtained from the Copyright Manager Tel: 020 8996 7070