BS 2782-11 Method 1109A-1989 Methods of testing plastics - Thermoplastics pipes fittings and valves - Resistance to environmental stress cracking of polyethylene pipes and fittings.pdf

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1、BRITISH STANDARD BS 2782-11: Method 1109A:1989 Methods of testing Plastics Part 11: Thermoplastics pipes, fittings and valves Method 1109A: Resistance to environmental stress cracking of polyethylene pipes and fittings for non-pressure applications IMPORTANT NOTE. Before reading this method it is es

2、sential to read BS 2782-0, issued separately.BS2782-11:Method 1109A:1989 This British Standard, having been prepared under the directionof the Plastics StandardsPolicy Committee,waspublished underthe authorityof the Board of BSI andcomes into effect on 31 October 1989 BSI 12-1999 The following BSI r

3、eferences relateto the work on this standard: Committee reference PLM/9 Draft for approval for publication88/39819 ISBN 0 580 17438 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Plastics Standards Policy Committee (PLM/-) to Technica

4、l Committee PLM/9, 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 (Construction Industries Directorate) Department of

5、the Environment (Property Services Agency) Department of Transport Electricity Supply Industry in England and Wales Engineering Equipment and Materials Users Association Health and Safety Executive Institution of Civil Engineers Institution of Gas Engineers Institution of Production Engineers Instit

6、ution of Water and Environmental Management (IWEM) National Association of Plumbing, Heating and Mechanical Services Contractors Plastics and Rubber Institute Plastics Land Drainage Manufacturers Association Royal Institute of Public Health and Hygiene Water Authorities Association Water Companies A

7、ssociation Water Research Centre The following bodies were also represented in the drafting of the standard, through sub committees and panels: British Adhesives and Sealants Association British Board of Agrement Heating and Ventilating Contractors Association Institute of Plumbing Land Drainage Con

8、tractors Association Ministry of Agriculture, Fisheries and Food RAPRA Technology Ltd. Amendments issued since publication Amd. No. Date of issue CommentsBS2782-11:Method 1109A:1989 BSI 12-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Principle 1 3 Materials

9、1 4 Apparatus 1 5 Test piece 1 6 Procedure 1 7 Test report 1 Publications referred to Inside back coverBS2782-11:Method 1109A:1989 ii BSI 12-1999 Foreword This British Standard has been prepared under the direction of the Plastics Standards Policy Committee. It describes a method for determining the

10、 resistance of polyethylene pipes and fittings to immersion in a liquid stress cracking agent at elevated temperature and may be useful for indicating potential failure of the component arising from unsuitable design or production in respect of processing. In drafting this standard, consideration ha

11、s been given to the work of Technical Committee 138 of the International Organization for Standardization (ISO) but this has not as yet resulted in the preparation of a corresponding method of test. It has been published under Part 11 of BS 2782 to enable cross-reference by revisions of British Stan

12、dard specifications for thermoplastics pipes and fittings for non-pressure applications, specifically BS 4660 and BS 5255, to avoid duplication in associated appendices. Attention is drawn to a related method of test for assembled fittings, given inAppendix C of BS5255:1988, which uses a modified re

13、agent solution under reflux for a shorter period and has not as yet been adopted for the purposes of any other British Standard. Part 11 of BS 2782 comprises a series of methods of test normally applied to the whole range of thermoplastics pipes, fittings and valves. WARNING. This British Standard d

14、oes not necessarily detail all the precautions necessary to comply with the requirements of the Health and Safety at Work etc. Act 1974. Attention should be paid to any appropriate precautions and the method should be operated only by trained personnel. A British Standard does not purport to include

15、 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

16、and ii, pages 1 and 2, an inside back cover 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.BS2782-11:Method1109A:1989 BSI 12-1999 1 1 Scope This British Standard d

17、escribes a method for determining the resistance of polyethylene pipes and fittings to immersion in a wet stress cracking agent at elevated temperature. It is applicable to pipes and fittings of any size for non-pressure applications where the pipes and fittings are subjected to contact with stress

18、cracking inducing agents and associated requirements are specified in the relevant product standard. It is a potentially destructive test intended chiefly for use as a type test to assess, for example, the material, manufacturing process and/or product design. NOTEThe titles of the publications refe

19、rred to in this standard are listed on the inside back cover. 2 Principle Test pieces in the form of complete fittings or sections of pipe are subjected without applied stress to immersion in a liquid stress cracking agent at an elevated temperature and inspected for consequent visible damage, usual

20、ly in the form of cracking and/or delamination. 3 Materials 3.1 Stress cracking agent, comprising a 2% (m/m) aqueous solution of either a sodium alkyl aryl sulphonate (e.g. the sodium salt of dodecyl benzene sulphonic acid) or, and in case of dispute, an alkyl aryl polyethylene glycol 1) . 4 Apparat

21、us 4.1 Immersion bath, comprising a vessel with a forced circulation and controls capable of maintaining a specified temperature throughout a liquid stress cracking agent (see 3.1) contained in sufficient quantity to submerge one or more test pieces (see clause5). 5 Test piece The test piece shall c

22、omprise either a complete section of pipe having a minimum length of 150 mm with ends each cut clean and square to the longitudinal axis, or a complete fitting, as applicable. 6 Procedure Unless otherwise specified by the applicable product standard, maintain the liquid agent in the immersion zone a

23、t 80 20 C. Ensure that the bath liquid is at the specified temperature. Submerge the test piece in the liquid. Remove the test piece briefly for inspection at will until signs of cracking or delamination are visible without magnification or until a cumulative immersion period of not less than 168 h

24、has elapsed. Then dissect the test piece as necessary, inspect all points of injection and/or weld lines and record any signs of cracking, delamination or other criteria specified by the relevant product standard, as applicable. NOTEThe number of test pieces submerged simultaneously or added to the

25、bath is unrestricted, subject to the requirements for temperature control. 7 Test report The test report shall include the following: a) a reference to this method of test, i.e.BS 2782:Method 1109A:1989, or the relevant product standard; b) full identification of the test piece, including the method

26、 of manufacture; c) identification of the stress cracking agent used; d) the liquid temperature used if not as given inclause 6; e) the result of the test, complete with a description of any cracking and/or delamination and/or other relevant observations, or confirmation that the test piece was visu

27、ally undamaged, as applicable; f) the immersion period, if less than 168 h; g) the date of the test. 1) For information on the availability of such materials, apply to Enquiry Section, BSI, Linford Wood, Milton Keynes MK14 6LE, enclosing a stamped addressed envelope for reply.2 blankBS2782-11:Method

28、1109A:1989 BSI 12-1999 Publications referred to BS 4660, Specification for unplasticized polyvinyl chloride (PVC-U) pipes and plastics fittings of nominal sizes 110 and 160 for below ground gravity drainage and sewerage 2) . BS 5255, Specification for thermoplastics waste pipe and fittings 2) . 2) R

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