BS-EN-921-1995 BS-2782-11-METHOD-1127A-1995..pdf
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1、BRITISH STANDARD BS EN 921:1995 BS 2782-11: Method 1127A:1995 Incorporating Amendment No. 1 Plastics piping systems Thermoplastics pipes Determination of resistance to internal pressure at constant temperature The European Standard EN 921:1994 has the status of a British Standard Licensed Copy: shef
2、fieldun sheffieldun, na, Tue Nov 07 03:38:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 921:1995 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
3、 June 1995 BSI 03-1999 The following BSI references relate to the work on this standard: Committee reference PRI/61 Draft for comment 92/47742 DC ISBN 0 580 24145 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/61,
4、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 Agrment) Depa
5、rtment 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
6、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 Soc
7、iety 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: Engineering Equipment and Materials Users Association ERA Technology Ltd. RAPRA T
8、echnology Ltd. Amendments issued since publication Amd. No.DateComments 8962December 1995 Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:38:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 921:1995 BSI 03-1999i Contents Page Committees responsibleI
9、nside front cover National forewordii Foreword2 Introduction3 1Scope3 2Normative references3 3Principle3 4Apparatus3 5Test objective and choice of end caps6 6Test pieces6 7Calibration of the apparatus and calculation of the test pressure6 8Conditioning6 9Procedure7 10Test report7 Figure 1 Illustrate
10、d principles for the two types of end devices for the internal pressure testing of pipes5 Table 17 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:38:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 921:1995 ii BSI 03-1999 National foreword This British Standard has been prepared by Tec
11、hnical Committee PRI/61 and is the English language version of EN 921:1994 Plastics piping systems Thermoplastics pipes Determination of resistance to internal pressure at constant temperature, published by the European Committee for Standardization (CEN). It is incorporated into BS 2782 Methods of
12、testing plastics Part 11 Thermoplastics pipes, fittings and valves, as Method 1127A:1995, for association with related test methods for plastics materials and plastics piping components. This test method has been prepared for reference by other standards under preparation by CEN for specification of
13、 plastics piping systems and components. It has been implemented to enable experience of the method to be gained and for use for other fresh applications. It is also for use for the revision or amendment of other national standards as practicable, but it should not be presumed to apply to any existi
14、ng standard or specification which contains or makes references to a different test method until that standard/specification has been amended or revised to make reference to this method and adjust any requirements as appropriate. BS 4728:1971, which provides for alignment with ISO 1167 where applica
15、ble, will be withdrawn when no longer required to support existing national standards for thermoplastics piping systems pending replacement by CEN standards currently under preparation for such piping systems. The principal differences between this method and BS 4728:1971 include the following. a) T
16、his method allows for the use of air or of another liquid as alternatives to water for the external environment of the test piece. b) For testing without hydrostatic end thrust, this method allows for use of external tie rods as an alternative to an internal coaxial tie rod. c) The permitted deviati
17、ons for the constant pressure are reduced from 2 % to d) For “evaluation” of pipe and/or fitting materials, this method specifies use of end caps which transmit the end thrust. Such end caps are designated “type a)”: those which do not are designated “type b)”. e) For testing pipes with nominal outs
18、ide diameter greater than 315 mm a minimum free length of at least 1 000 mm is required, not 3d. f) This method also covers the testing of fitting material in the form of injection-moulded pipe, in which case the minimum free length, excluding the integral closed end, if any, is 140 mm. g) This meth
19、od does not include an “acceptance test” (batch test) of the type given in 6.1 of BS 4728:1971. h) This method gives conditioning times depending on groups of wall thickness, instead of 1 h after attaining the test temperature. i) This method requires the time for pressurization to be the shortest t
20、ime practicable between 30 s and 1 h, instead of “within 60 s”, and hence the imprecise upper limit of pipe sizes which it is practicable to test is considerably extended. j) This method requires any pipe failiure to be classified as brittle or ductile. + 2 1 - - % Licensed Copy: sheffieldun sheffie
21、ldun, na, Tue Nov 07 03:38:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 921:1995 BSI 03-1999iii WARNING. It is necessary to take account of the conseqences of failure of the components under pressure and to contain the test piece or apparatus accordingly. A British Standard does not purport t
22、o 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,
23、 pages i to iv, the EN title page, pages 2 to 7 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. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:38:39 GMT
24、+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 03:38:39 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 921 November 1994 ICS 23.040.20Incorporates corrigendum AC March 1995 Descriptors: Fluid pi
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- BS-EN-921-1995 BS-2782-11-METHOD-1127A-1995. BS EN 921 1995 2782 11 METHOD 1127 1995.
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