BS EN 763-1995 Plastics piping and ducting systems — Injection-moulded thermoplastics.pdf

BRITISH STANDARD BS EN 763:1995 BS 2782-11: Methods 1103A and B: 1995 Plastics piping and ducting systems Injection-moulded thermoplastics fittings Test method for visually assessing effects of heating The European Standard EN 763:1994 has the status of a British Standard UDC 621.643.2-036:621.643.06-036.073:620.1 BS EN 763:1995 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 06-1999 The following BSI references relate to the work on this standard: Committee reference PRI/61 Draft for comment 92/43172 DC ISBN 0 580 24220 X 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: ERA Technology Ltd. Engineering Equipment and Materials Users Association RAPRA Technology Ltd. Amendments issued since publication Amd. No.DateComments BS EN 763:1995 © BSI 06-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Introduction3 1Scope3 2Principle3 3Apparatus3 4Test pieces3 5Procedure for method A, using an air oven3 6Procedure for method B, using a liquid bath4 7Test report4 Annex A (informative) Background information for setting test temperatures and heating periods5 Table A.15 BS EN 763:1995 ii © BSI 06-1999 National foreword This British Standard has been prepared under the direction of the Sector Board for Materials and Chemicals and is the English language version of EN 763:1994 Plastics piping and ducting systems Injection-moulded thermoplastics fittings Test method for visually assessing effects of heating, 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 1103A: and B:1995, so that method 1103A corresponds to method A of EN 763:1994 and method 1103B corresponds to method B of EN 763:1994. Method 1103A is a revision of BS 2782-11:Method 1103A:1982, which is withdrawn. The principal changes with respect to the 1982 edition of Method 1103A (which are not expected to have a significant effect on the results obtained) are as follows: a) there is no longer a requirement for conditioning for at least 30 min at (23 ± 2) °C prior to testing; b) there is no longer a specific requirement for measurements to be made to an accuracy of 0.1 mm; c) whilst the results calculated continue to be the depth of crack penetration as a percentage of the relevant wall thickness, the results from injection points are no longer designated by the symbol T and those from interior- or end-ring gates are no longer designated by the letters D or C respectively; d) the test report does not require details of the number of fittings in the production batch; e) guidance is provided, in Annex A, on the specification of heating times of PVC-U fittings as a function of wall thickness and temperature. Method 1103B introduces the option of carrying out the test in a liquid bath instead of the air oven used in method A. In the event of methods A and B not giving identical results, method A is designated as the reference method in cases of dispute. These test methods are incorporated into BS 2782 for association with related test methods for plastics materials and plastics piping components. These methods have been prepared for reference by other standards under preparation by CEN for specification of plastics piping systems and components. They have been implemented to enable experience of the method to be gained and for use for other fresh applications. They are also for use for the revision or amendment of other national standards as practicable, but they should not be presumed to apply to any existing standard or specification which contains or makes reference to a different test method, or a previous edition of these test methods, until that standard/specification has been amended or revised to make reference to these methods and adjust any requirements as appropriate. Method 1103A:1982 of BS 2782 is now obsolescent and will be withdrawn when no longer required to support national standards, specifically BS 4576-1:1989, BS 4660:1989 and BS 5255:1989, pending their replacement by CEN standards currently under preparation for such types of piping systems. WARNING NOTE. This British Standard, which is identical with EN 763:1994, does not necessarily detail all the precautions necessary to meet the requirements of the Health and Safety at Work etc. Act 1974. Attention should be paid to any appropriate safety precautions and the method should be operated only by trained personnel. ? BS EN 763:1995 © BSI 06-1999iii 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 to iv, the EN title page, pages 2 to 5 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. ? iv blank ? EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 763 April 1994 UDC 621.643.2-036:621.643.06-036.073:620.1 Descriptors: Plastics, thermoplastics, piping, fitting, injection moulded, heating, oven, liquid bath, test English version Plastics piping and ducting systems Injection-moulded thermoplastics fittings Test method for visually assessing effects of heating Systèmes de canalisations et de gaines en plastiques Raccords thermoplastiques moulés par injection Méthode d essai pour estimer visuellement les effets du chauffage Kunststoff-Rohrleitung- und Schutzrohrsysteme Spritzguß-Formstücke aus Thermoplasten Prüfverfahren für die visuelle Beurteilung der Einflüsse durch Warmlagerung This European Standard was approved by CEN on 1994-04-11. 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 status 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 763:1994 E ? EN 763:1994 © BSI 06-1999 2 Foreword This standard has been prepared by CEN/TC 155, Plastics piping systems and ducting systems. This standard is based on ISO 580:1990 Injection-moulded unplasticized poly(vinyl chloride) (PVC-U) fittings Oven test Test method and basic specifications, published by the International Organization for Standardization (ISO). It is a modification of ISO 580:1990 for reasons of applicability to other thermoplastics materials and/or other test conditions and alignment with texts of other standards on test methods. The modifications are: no material is mentioned except in Annex A, which is informative, concerning the setting of test temperatures and periods for fittings of PVC-U; the method using a liquid bath is incorporated as a standardized method (method B) as an alternative to the method using an air oven (method A), with the air oven method remaining the reference method; test parameters, except those common to all plastics, are omitted; no material-dependent requirements are given; editorial changes have been introduced. The material-dependent parameters and/or performance requirements are incorporated in the System Standard(s) concerned. Annex A, which is informative, gives background information for setting test temperatures and heating periods for testing PVC-U fittings. No existing European Standard is superseded by this standard. This standard will result in one of a series of standards on test methods which support System Standards for plastics piping systems and ducting systems. 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 October 1994, and conflicting national standards shall be withdrawn at the latest by October 1994. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. ? EN 763:1994 © BSI 06-19993 Introduction The two test methods described in this standard are based upon those given in ISO 580:1990, the introduction to which is reproduced in Annex A for guidance in setting test parameters appropriate to fittings of differing materials and/or dimensions. Because the results are dependent upon such factors and the test conditions, the results obtained using an air oven (method A) or a liquid bath (method B) may not be identical. One of the methods, i.e. method A (air oven), is therefore declared to be the reference method, for use in case of dispute, permitting the other method to be used when otherwise convenient. 1 Scope This standard specifies methods for visually assessing the effects of heating on injection-moulded thermoplastics fittings, including cracking or splitting induced by residual stress. It is applicable to fittings for pressure and non-pressure applications, e.g. flanged fittings, fittings incorporating elastomeric sealing rings and fittings consisting of the assembly of a number of moulded parts. Two methods are given, involving respectively use of an air oven, designated method A, and of a liquid bath, designated method B. In the event of these methods giving differing results, method A is declared to be the reference method for use in case of dispute. 2 Principle Complete mouldings are subjected to a specified temperature,T, in an air-circulating oven or a liquid bath, for a given time depending on the wall thickness and the moulded material. The surfaces of the moulding are examined before and after heating, and any cracks, blisters, delamination or weld openings are measured and expressed as a percentage of the wall thickness. NOTEIt is assumed that the following test parameters are set by the standard making reference to this standard: a) the test temperature, T, (see 3.1 and 5.1 or 3.2 and 6.1); b) the test method to be used and, for method B (liquid bath) only, the liquid (see 3.2); c) the time period, t, for heating at the test temperature T (see 5.3 or 6.3, as applicable); d) the acceptable limits for the occurrence or dimensions of any cracks or other features found and reported in accordance with items g) and h) of clause 7, especially if these would enable the use of go/no-go probes or other gauges (see 5.6 or 6.6, as applicable). 3 Apparatus 3.1For method A only (see 5.1), air-circulating oven, thermostatically controlled so that the temperature of the working zone can be maintained at the specified test temperature (T ± 2) °C (see clause 2) and of sufficient heating capacity to enable the test temperature to be regained within 15 min of having inserted the test pieces (see also 3.3). 3.2 For method B only (see 6.1), liquid bath, thermostatically controlled so that the temperature of the working zone of the liquid therein can be maintained at the specified test temperature (T ± 2) °C. The liquid used shall be stable at the test temperature and shall not otherwise affect the moulding under test (see also 3.3). It shall be ensured that the liquid does not cause any safety or health risks. 3.3 Laboratory measuring instruments, probes or tools, as necessary for measuring the dimensions of cracks or other features as required by clause 5 or clause 6 either directly or relative to an applicable specified limiting value. 4 Test pieces 4.1 Preparation of test pieces Take for each test piece required a complete moulding. If the fitting incorporates an elastomeric sealing ring, remove this before testing the fitting. In the case of fittings assembled from more than one moulding, separate the mouldings from each other, to form individual test pieces. Inspect the test piece for and record any visible cracks, blisters, delamination or weld lines in a manner that will enable comparison with the appearance of the test piece after heating (see item g) of clause 7). 4.2 Number of test pieces If not otherwise specified in the referring standard, use at least three test pieces for assessing a given moulding sample. 5 Procedure for method A, using an air oven NOTE 1For method B, using a liquid bath, see clause 6. NOTE 2For the test report, for both methods, see clause 7. 5.1 Set the temperature of the oven (see 3.1) at (T ± 2) °C. 5.2 Put the test pieces in the oven and arrange them so that they are standing on one end, whenever possible, avoiding all contact with another test piece or the sides of the oven. ? EN 763:1994 4 © BSI 06-1999 5.3 Leave