1、BRITISH STANDARD BS 4962:1989 Incorporating Amendment No. 1 Specification for Plastics pipes and fittings for use as subsoil field drainsBS4962:1989 This British Standard, having been prepared under the directionof the Plastics StandardsPolicy Committee, waspublished under the authorityof the Board
2、of BSI andcomes into effect on 31July1989 BSI 01-2000 First published September 1973 First revision August 1982 Second revision July 1989 The following BSI references relate to the work on this standard: Committee reference PLM/9 Draft for comment 88/41085 DC ISBN 0 580 17428 X Committees responsibl
3、e for this British Standard The preparation of this British Standard was entrusted by the Plastics Standards Policy Committee (PLM/-) to Technical Committee PLM/9, upon which the following bodies were represented: British Board of Agrment British Gas plc British Plastics Federation British Plumbing
4、Fittings Manufacturers Association British Valve and Actuator Manufacturers Association Department of the Environment (Building Research Establishment) Department of the Environment (Construction Industries Directorate) Department of the Environment (Property Services Agency) Department of Transport
5、 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 Institution of Water and Environmental Management (IWEM) National Associ
6、ation of Plumbing, Heating and Mechanical Services Contractors Plastics and Rubber Institute Plastics Land Drainage Manufacturers Association Royal Institute of Public Health and Hygiene Society of British Gas Industries Water Authorities Association Water Companies Association Water Research Centre
7、 The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Adhesives and Sealants Association Department of Agriculture and Fisheries for Scotland Department of Agriculture Northern Ireland Heating and Ventilating Contractors Association In
8、stitute of Plumbing Land Drainage Contractors Association Ministry of Agriculture, Fisheries and Food National Association of Agricultural Contractors National Farmers Union Amendments issued since publication Amd. No. Date of issue Comments 9131 July 1996 Indicated by a sideline in the marginBS4962
9、:1989 BSI 01-2000 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Materials 1 4 Construction and dimensions 1 5 Pipe stiffness 2 6 Resistance to impact 2 7 Flexibility of coilable pipe and associated joints 3 8 Extensibility of coilable pipe and asso
10、ciated joints 3 9 Fittings for joints and junctions 3 10 Marking 3 Appendix A Text deleted 5 Appendix B Determination of specific tangential end stiffness and ringstiffnessof the pipe 5 Appendix C Text deleted 5 Appendix D Text deleted 6 Appendix E Determination of resistance to impact 6 Appendix F
11、Determination of flexibility 9 Appendix G Extensibility and joint tests 11 Appendix H Methods of test for stretched pipe 13 Appendix J Guidance on quality control testing 18 Appendix K Guidance on storage and installation 19 Figure 1 Figure deleted 5 Figure 2 Figure deleted 5 Figure 3 Typical test a
12、pparatus for determination of resistance to impact 7 Figure 4 Typical layout of ducts for determination of flexibility 10 Figure 5 Diagrammatic representation of extensibility and joint strengthtests 12 Figure 6 Typical internal grip for extending test pieces 14 Figure 7 Typical external grips for e
13、xtending test pieces 15 Figure 8 Bedding conditions for open trench laying 20 Table 1 Table deleted Table 2 Example of the typical plot of impact test data 8 Table 3 Example of data tabulation 8 Table 4 Applicability of requirements and test methods 18 Publications referred to Inside back coverBS496
14、2:1989 ii BSI 01-2000 Foreword This British Standard has been prepared under the direction of the Plastics Standards Policy Committee. It is a revision of BS4962:1982 which is withdrawn. The main differences between this revision and the previous edition are as follows. a) The title of the specifica
15、tion has been changed: 1) to indicate that the specification applies to pipes and fittings; 2) to delete “light duty” and substitute “field”, for clarity of purpose. b) The maximum design outside diameter for pipes has been increased from200mm to400mm. c) The scope and requirements have been extende
16、d to include unperforated pipes otherwise corresponding to the perforated pipes for use as carrier drains or where systems of perforated pipes are to be linked by unperforated sections, as in the vicinity of tree roots. d) Methods for testing pipe in a stretched condition have been detailed, by intr
17、oduction ofAppendix H. e) Text deleted f) The severity of the impact test has been increased by doubling the mass of the striker to be used. g) The marking requirements include the date of this British Standard and this together with the number of this British Standard is to be marked on each pipe a
18、nd fitting to supplement the manufacturers identification. The standard remains largely a performance specification and no restriction is made on the type of plastics material to be used for the manufacture of pipes and fittings in accordance with this standard. In the preparation of this British St
19、andard attention has been given to the work of Technical Committee138 of the International Organization for Standardization(ISO). In this British Standard, however, general performance requirements are specified whereas the ISO approach will be to issue specifications for each type of material which
20、 can be used for this application. Appendix J gives general guidance on the nature of the requirements and the primary purpose of the test methods, to assist in the preparation of quality plans. Appendix K gives guidance for storage and laying conditions for pipes and is based on a technical note or
21、iginally prepared by the Ministry of Agriculture, Fisheries and Food (MAFF). Product certification. Users of this British Standard are advised to consider the desirability of third party certification of product conformity with this British Standard based on testing and continuing surveillance, whic
22、h may be coupled with assessment of a suppliers quality systems against the appropriate Part ofBS5750. Enquiries as to the availability of third party certification schemes will be forwarded by BSI to the Association of Certification Bodies. If a third party certification scheme does not already exi
23、st, users should consider approaching an appropriate body from the list of Association members. Attention is drawn to the provisions of the Health and Safety at Work etc. Act1974 and the need to ensure that appropriate precautions are taken to ensure the safety of personnel when carrying out methods
24、 of test required by this standard.BS4962:1989 BSI 01-2000 iii 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 fr
25、om legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages1to 20, 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 amendmen
26、t table on the inside front cover.iv blankBS4962:1989 BSI 01-2000 1 1 Scope This British Standard specifies requirements for the construction, dimensions, materials and performance of plastics pipes of up to400mm nominal outside diameter, with or without perforations, and for any associated fittings
27、 for normal field drainage. No restrictions are placed on the type of plastics material to be used. Methods of test, associated guidance and information on quality control testing are given in appendices. NOTEThe titles of the publications referred to in this standard are listed on the inside back c
28、over. 2 Definitions For the purposes of this British Standard the following definitions apply. 2.1 coilable pipe pipe which, together with associated joints, is intended for machine laying, i.e.it is required to be able to bend reasonably freely and to withstand tensile forces without excessive exte
29、nsion during the laying process. Typically, such pipe will have a corrugated wall and employ a jointing system which positively engages with the pipe 2.2 design internal diameter the internal diameter of a pipe declared by the pipe and fitting manufacturer 2.3 design outside diameter the outside dia
30、meter of a pipe declared by the pipe and fitting manufacturer 2.4 design perforation length the design length of individual perforations declared by the pipe manufacturer NOTEThis is the length against which the requirements of4.5 are determined. 2.5 Text deleted 2.6 non-coilable pipe pipe which, to
31、gether with associated joints, is neither required to be able to bend appreciably nor to withstand tensile forces. Typically, such pipe will be smooth walled on both interior and exterior surfaces and employ a spigot and socket jointing system 2.7 specific tangential end stiffness (STES 2 year ) the
32、 stiffness corresponding to the2year value of STES in accordance withAnnexA of BSENISO9967 3 Materials The material used for the manufacture of the pipe or fitting shall comprise any plastics material. 4 Construction and dimensions 4.1 Construction The pipe shall be smooth and/or corrugated in confo
33、rmation and of any design outside diameter up to400mm. 4.2 Internal diameter The internal diameter of the pipe shall be not less than the design value stated by the manufacturer. Before assessing a pipe for compliance, re-rounding of the pipe is permissible. For pipe of design internal diameter not
34、greater than200mm, compliance shall be checked using a plug gauge to suit the design diameter stated by the manufacturer and at least half that pipe diameter in length. Before using this gauge, any swarf or small protrusions on the inside of the pipe shall be removed. For larger diameter pipes, comp
35、liance shall be checked using any device capable of measuring internal diameter to an accuracy of within 0.2%, such as a bore micrometer or calipers, to determine the minimum internal diameter over a length corresponding to not less than half the design internal diameter. 4.3 Outside diameter The ou
36、tside diameter of the pipe shall comply with4.1 and shall not differ from the design value stated by the manufacturer by more thanmm or%, whichever is the greater. Before assessing a pipe for compliance, re-rounding of the pipe is permissible. For pipe of design internal diameter not greater than200
37、mm, compliance shall be checked using the ring gauges appropriate to the pipe design outside diameter, and the applicable tolerance thereon, and having a length of at least half their internal diameter. Before using these gauges any swarf on the cut end shall be removed. + 0.5 1.5 + 0.25 0.75BS4962:
38、1989 2 BSI 01-2000 For larger diameter pipes, compliance shall be checked using any device capable of measuring outside diameter to an accuracy of within 0.02%, such as a circumferential tape or calipers, to determine the maximum and minimum outside diameter over a length corresponding to not less t
39、han half the design outside diameter. 4.4 Ovality The largest outside diameter of the pipe shall be such that it is not more than110% of the outside diameter at right angles to it. 4.5 Perforations 4.5.1 Pipes shall be perforated or unperforated. If perforated, the pipe shall have perforations for w
40、ater entry which comply with4.5.2 to4.5.4, except for zones within two pipe diameters of either end of a length or coil, where such zones may be either perforated or unperforated. If the extension of the pipe is greater than10% when tested in accordance withAppendix G, additional test pieces shall c
41、omply with4.5.2 to4.5.4 when stretched to the extension obtained (seeAppendix H). 4.5.2 Perforations in their least dimension, except as given in4.5.3, shall be not less than0.8mm and not greater than2.0mm. Compliance shall be checked for at least the design perforation length using a GO gauge of0.8
42、mm and a NOT-GO gauge of2.0mm. No force shall be applied in using the gauges, in particular no material shall be removed to facilitate the entry of the gauge. When some types of pipe are coiled, there is a tendency for the perforations to distort slightly:therefore, in cases of dispute, the check wi
43、th the GO/NOT-GO gauges shall be made on a straightened length of pipe. 4.5.3 Provided that there are not less than500mm total length of perforations complying with4.5.2 per metre of pipe, perforations measured on any metre of pipe taken at random need not comply with4.5.2 in that up to25% of the pe
44、rforations may have a least dimension of less than0.8mm, and up to2% of the perforations may have a least dimension greater than2.0mm but not greater than3.0mm. The length of the individual perforations shall not exceed the design perforation length by more than50%. 4.5.4 The distribution of perfora
45、tions shall be such that there is at least one perforation in every50mm length of pipe and at least one perforation per120 segment in every150mm length of pipe, except for zones unperforated in accordance with4.5.1. 5 Pipe stiffness 5.1 Specific tangential end stiffness (STES 2 year ) NOTE 1This tes
46、t is intended as a type test (seeAppendix J). When tested in accordance withAppendix B the predicted 2year(17520h) STES 2 yearvalue shall be not less than1.00kN/m 2 . NOTE 2For some pipe constructions, the arrangement of perforations is such that the orientation of the pipe with regard to the applie
47、d force significantly affects the stiffness. The requirements apply to the least favourable orientation. 5.2 Ring stiffness (S) 5.2.1 For type test purposes, when tested in accordance withB.2.2 the ring stiffness of each test piece, e.g.S aas designated in that method, shall be not less than2.00kN/m
48、 2 . 5.2.2 For inspection testing purposes, when tested in accordance with BS2782-11:Method1114B (BSENISO9969) the ring stiffness of each test piece, e.g.S aas designated in that method, shall be not less than the higher of the following limits, as applicable: a) 2.00 kN/m 2 ; b) not less than: 1) 9
49、0 % of the value of S obtained in accordance with5.2.1 if the corresponding STES 2 yearvalue was not greater than1.50kN/m 2 ; 2) 80 % of the value of S obtained in accordance with5.2.1 if the corresponding STES 2 yearvalue was greater than1.50kN/m 2 . 6 Resistance to impact When tested in accordance withAppendix E using the procedure described inE.5 the pipe shall fulfil one of the following conditions: a) in the first 17 test pieces tested no failures occur (in which case the seventeenth impact height will be2m); b) during the sequence of passes
