1、BRITISH STANDARD BS1196:1989 Specification for Clayware field drain pipes and junctions UDC 677.055:001.4+006.74BS1196:1989 This British Standard, having been prepared under the directionof the Clay Products Standards Committee, was published under the authority ofthe Board of BSI and comes intoeffe
2、ct on 28 February1989 BSI11-1999 First published December1944 First revision July1971 Second revision February1989 The following BSI references relate to the work on this standard: Committee reference CLB/10 Draft for comment86/13653 DC ISBN 0 580 16152 8 Committees responsible for this British Stan
3、dard The preparation of this British Standard was entrusted by the Clay Products Standards Committee (CLB/-) to Technical Committee CLB/10, upon which the following bodies were represented: Clay Pipe Development Association Limited Department of Agriculture and Fisheries for Scotland Land Drainage C
4、ontractors Association Ministry of Agriculture, Fisheries and Food National Federation of Clay Industries Ltd. Amendments issued since publication Amd. No. Date of issue CommentsBS1196:1989 BSI 11-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3
5、Dimensions and tolerances 1 4 Crushing strength 2 5 Marking 2 Appendix A Optional sampling and tests to be agreed between themanufacturerand purchaser, if the purchaser intends tobecomeinvolvedinsampling 3 Appendix B Crushing strength test 3 Figure 1 Deviation from straightness, D s 1 Figure 2 Crush
6、ing testing machine 3 Table 1 Nominal sizes and limits of size 1 Publication referred to Inside back coverBS1196:1989 ii BSI 11-1999 Foreword This British Standard has been prepared under the direction of the Clay Products Standards Committee. BS1196 was first published in1944 and a metric edition f
7、ollowed in1971. The present revision supersedes that of1971, which is withdrawn. Few changes of technical significance have been found necessary, but the text has been brought into line with current BSI drafting policy. The main technical changes are as follows. a) Limits have been introduced for th
8、e variation from the manufacturers stated nominal value of the branch angle of junctions. It is now permissible for the strength of junctions to be assessed from the test results for pipes produced in the same plant and using the same materials and process. Alternatively, short lengths of pipes, of
9、not less than0.3m in length, may be made and tested for this purpose. b) In place of the clause on sampling for tests given in BS1196:1971, anappendix has been added giving advice on optional sampling and tests to be agreed between the manufacturer and purchaser. c) A marking clause has been added t
10、o facilitate identification for compliance and certification. Attention is drawn to the need to install the pipes in accordance with the recommendations of the Ministry of Agriculture, Fisheries and Food (MAFF) Technical Note “Workmanship and materials for field drainage schemes”. A British Standard
11、 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
12、inside front cover, pagesi andii, pages1 to4, 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.BS1196:1989 BSI 11-1999 1 1 Scope This British St
13、andard specifies requirements for unglazed clayware field drain pipes and junctions, butt jointed and circular in section. The requirements specified cover dimensions, tolerances, crushing strength and marking. NOTE 1Appendix A gives advice on optional sampling and tests to be agreed between the man
14、ufacturer and purchaser. NOTE 2The title of the publication referred to in this standard is given on the inside back cover. 2 Definitions For the purposes of this British Standard the following definitions apply. 2.1 nominal size (DN) a numerical designation of the size of a unit, which is a conveni
15、ent round number approximately equal to a manufacturing dimension NOTEFor the purposes of this standard, this dimension is the nominal bore of the pipe or junction. 2.2 ovality the difference between the maximum and minimum dimensions of the cross-sectional bore of the barrel of a pipe or junction 2
16、.3 deviation from straightness of a pipe barrel,D s the maximum distance from a straight line, spanning the concave curves on the outside surface of the pipe, to the pipe surface NOTESee Figure 1. 3 Dimensions and tolerances 3.1 Nominal size The nominal sizes of the pipes or junctions shall be as gi
17、ven in column1 of Table 1. 3.2 Bore The bore of the barrel of a pipe or junction shall not deviate from the nominal size beyond the limits given in column2 of Table 1. 3.3 Ovality The ovality of a pipe or junction shall not exceed the appropriate limit given in column3 of Table 1. Table 1 Nominal si
18、zes and limits of size 3.4 Wall thickness The radial thickness of the wall of any pipe or junction shall be not greater than that shown in column4 of Table 1. In any single pipe or junction the variation in the radial thickness of the wall shall be not greater than2mm. 3.5 Length The nominal length
19、of pipes shall be305mm for nominal sizes DN75, DN100 and DN150, and305mm,450mm and600mm for nominal sizes greater than DN150. The tolerance on the nominal length shall be 1.6%. 3.6 Straightness The maximum deviation from straightness of the barrel of a pipe shall not exceed5mm per305mm of nominal le
20、ngth (see Figure 1). 3.7 Branch angle of junctions The tolerance on the branch angle of a junction shall be 5 on the manufacturers stated nominal value. Figure 1 Deviation from straightness, D s 1 2 3 4 Nominal size (DN) Limits of bore size Limit of ovality Maximum wall thickness Min. Max. 75 100 15
21、0 225 300 mm 71 95 145 219 292 mm 81 107 160 239 317 mm 4 5 6 9 10 mm 18 18 21 27 35BS1196:1989 2 BSI 11-1999 4 Crushing strength NOTECrushing strength tests should be done last. 4.1 Pipes When tested to failure in accordance with Appendix B, pipes shall exceed an intensity of loading of not less th
22、an11.5kN/m of nominal inside length. 4.2 Junctions produced alongside pipes Where junctions are produced alongside pipes, using the same materials and process, their crushing strength is deemed to be that of the pipes which have been tested in accordance with4.1. 4.3 Junctions not produced alongside
23、 pipes Where junctions are not produced alongside pipes, their crushing strength is deemed to be that of lengths of pipe, not less than0.3m long, made for test purposes using the same materials and process as those of the junctions and tested in accordance with4.1. NOTESix such pipe lengths should b
24、e prepared for each1000 junctions. 5 Marking Clayware field drain pipes and junctions shall be marked with the following: a) the name, trade mark or other means of identification of the manufacturer; b) the number of this British Standard, i.e.BS1196 1) . 1) Marking BS1196 on or in relation to a pro
25、duct represents a manufacturers declaration of conformity, i.e.a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declaration is not to be confuse
26、d with third party certification of conformity, which may also be desirable.BS1196:1989 BSI 11-1999 3 Appendix A Optional sampling and tests to be agreed between the manufacturer and purchaser, if the purchaser intends to become involved in sampling A.1 Sampling of pipes for tests It is suggested th
27、at the purchaser or his representative select at random in the presence of the manufacturer at the rate of not less than six pipes per1000 (or part thereof) from each consignment. A.2 Sampling for pipes representing junctions A.2.1 When junctions are made alonside pipes, the strength of the pipes se
28、lected inA.1 can be taken to represent that of the junctions. A.2.2 When junctions are not made alongside pipes, six or more pipe lengths made to represent the junction consignment should be strength tested for each1000 junctions made (see4.3). A.3 Consignment compliance criteria If three or more of
29、 either the pipes selected in accordance withA.1 or the pipe lengths made in accordance withA.2.2 fail to comply with this standard, the consignment represented by the samples should be deemed not to comply. If one or two of either the pipes selected in accordance withA.1 or the pipe lengths made in
30、 accordance withA.2.2 fail to comply with this standard, a further six pipes should be selected or pipe lengths made in accordance withA.1 orA.2.2 as appropriate and the tests repeated. Failure of one of these pipes should be taken to indicate that the consignment fails to comply with the standard.
31、NOTEFailure of a consignment of pipes would not of course preclude proof testing each of the remaining pipes to select those which comply with the standard. This procedure is not of course open where junctions are being assessed by testing representative pipes. Appendix B Crushing strength test B.1
32、Apparatus B.1.1 General. The testing machine (see Figure 2) shall be substantial and rigid throughout, so that the distribution of the load is not affected appreciably by the deformation or yielding of any part. B.1.2 Supports. The supports for the bearers shall be rigid. B.1.3 Bearers. The bearers
33、shall be centrally located on the supports and shall consist of metal or hard wood free from warps and twists. The rectangular cross section of the bearer shall be at least170mm 25mm. B.1.4 Bearing strips. The bearing strips shall consist of elastomeric material having a hardness of50 5 IRHD. The st
34、rips shall be of rectangular cross section having a width of505mm and a thickness of not less than25mm nor more than40mm. The bearing strips shall be used with the50 5mm dimension in contact with the pipe. The two bottom strips shall be of equal thickness, parallel and spaced255mm apart. The length
35、of the bearing strips shall be the full length of the pipe. Figure 2 Crushing testing machineBS1196:1989 4 BSI 11-1999 B.2 Procedure Support the pipe in a horizontal position on the two lower bearing strips parallel to its longitudinal axis, so that the plane of any permitted longitudinal deviation
36、from straightness is horizontal. Apply the load to the upper support as shown in Figure 2: a) at a point equidistant from the ends of the pipe; b) along the length of the pipe barrel through the upper support, bearer and bearing strip; and c) in such a manner that the combination of support, bearer
37、and bearing strip is free to rotate in a vertical plane through the longitudinal centre-lines of the top and bottom bearers. Apply the load without vibration or sudden shock and at a uniform rate of not greater than0.17kN/m of pipe per second until the pipe fails. Calculate the intensity of loading
38、per metre of nominal length by dividing the total applied failing load by the nominal inside length of the barrel.BS1196:1989 BSI 11-1999 Publication referred to Ministry of Agriculture, Fisheries and Food Technical Note “Workmanship and materials for field drainage schemes” 2) . 2) Referred to in t
39、he foreword only and available from HMSO,49 High Holborn, London, W1 for personal callers or by post from HMSO, P.O. Box276, London, SW85DT.BS1196:1989 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStanda
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