1、BRITISH STANDARD BS5254:1976 Incorporating Amendment Nos.1 and2 Specification for Polypropylene waste pipe and fittings (external diameter34.6mm,41.0mm and54.1mm) UDC621.643.29:678.742.3462:696.122:628.21BS5254:1976 This British Standard, having been approved by the Plastics Industry Standards Commi
2、ttee, was published under the authorityof the Executive Boardon 30 January1976 BSI06-1999 The following BSI references relate to the work on this standard: Committee references PLC/9 andPLC/9/4 Draft for comment71/52878 ISBN 0 580 08845 6 Co-operating organizations The Plastics Industry Standards Co
3、mmittee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and industrial organizations: The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the
4、 following, were directly represented on the committee entrusted with the preparation of this British Standard: British Plastics Federation* Engineering Equipment Users Association* British Resin Manufacturers Association Ministry of Defence* Chemical Industries Association Ltd.* Plastics Institute
5、Department of the Environment, Building Post Office Research Establishment* Royal Institute of British Architects* Department of Industry Chemicals and Royal Institute of Public Health and Hygiene Textiles Rubber and Plastics Research Association of Electrical and Electronic Insulation Association G
6、reat Britain Electrical Installation Equipment Society of Motor Manufacturers and Traders Manufacturers Association Ltd.* Electrical Research Association Association of Public Health Inspectors Institution of Water Engineers British Chemical and Dyestuffs Traders Lloyds Register of Shipping Associat
7、ion Ltd. Ministry of Agriculture, Fisheries and Food British Gas Corporation National Association of Plumbing, Heating British Precast Concrete Federation and Mechanical Service Contractors British Rubber Manufacturers Association Ltd. National Federation of Builders and British Steel Industry Plumb
8、ers Merchants Copper Tube Fittings Manufacturers National Water Council Association Oil Companies Materials Association Department of the Environment Pitch Fibre Pipe Association Gas List Tube Association Royal Institution of Chartered Surveyors Greater London Council Royal Society of Health Institu
9、te of Plumbing Society of Builders Merchants Institution of Civil Engineers Water Companies Association Institution of Municipal Engineers Water Research Association Institution of Public Health Engineers Amendments issued since publication Amd. No. Date of issue Comments 3588 May1981 4438 December1
10、983 Indicated by a sideline in the marginBS5254:1976 BSI 06-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Material 1 4 Appearance 1 5 Pipe dimensions 1 6 Fitting dimensions 1 7 Length of pipe 1 8 Marking 1 9 Heat reversion requirement for p
11、ipe 2 10 Impact requirement for pipe 2 11 Hydrostatic pressure requirement 2 12 Stress relief requirement 2 13 Elevated temperature cycling requirement 2 14 Joint systems 3 Appendix A Heat reversion test for pipe 4 Appendix B Impact test for pipe 4 Appendix C Hydrostatic pressure test 4 Appendix D S
12、tress relief test 5 Appendix E Elevated temperature cycling test 5 Figure 1 Socket dimensions for fittings 6 Figure 1d Positions for measurement of snap cap wall thicknesses 7 Figure 2 Bends and equal branches 7 Figure 3 Unequal branches 8 Figure 4 Reducers 8 Figure 5 Straight coupling (with or with
13、out register) 9 Figure 6 Socket plugs (with or without access cap) 9 Figure 7 Adaptors 9 Figure 8 Typical caulking bush 9 Figure 9 Suitable type of impact testing machine 10 Figure 10 Typical test installation for elevated temperature cycling test 11 Table 1 Dimensions of polypropylene pipe and fitt
14、ings 3 Table 2 Minimum dimensions of joint sockets 3 Publications referred to 12BS5254:1976 ii BSI 06-1999 Foreword This British Standard has been prepared under the authority of the Plastics Industry Standards Committee. Requirements are given for waste pipe and fittings manufactured from polypropy
15、lene intended to convey normal domestic effluent. Detailed material requirements are not specified but there is a requirement to be able to withstand the long term effects of the intermittent discharge of hot water. The outside diameters of pipes specified in this standard are based upon superseded
16、copper pipe sizes in accordance with BS659 (generally copper tubes are now manufactured to metric sizes in accordance with Part1 “Copper tubes for water, gas and sanitation” of BS2871 “Copper and copper alloys, tubes”) and some local authorities in the UK may deem them to be unacceptable. Attention
17、is drawn to BS5255 “Plastics waste pipe and fittings”, which specifies waste pipe systems with bore dimensions based on the clear bore principle and manufactured from ABS, modified UPVC, polypropylene and high density polyethylene. Notwithstanding the foregoing, the minimum bore of pipes and fitting
18、s covered by this standard is in excess of the minimum bore of the outlets of associated plastic traps in accordance with BS3943 “Plastics waste traps” which discharge into the waste pipes covered by this standard. It is the intention to continue studies towards the introduction of a fully rational
19、range of pipe in line with those being considered internationally by Technical Committee138 of the International Organization for Standardization (ISO). The various jointing methods in use preclude at present the standardization of the lengths and configurations of fittings. Because the length of wa
20、ste pipe from the sanitary apparatus is subjected to waste water at its highest temperature and may also be flowing full-bore, the elevated temperature cycling test for waste pipe and fittings is carried out using hotter water than the similar test for soil pipe and fittings. Certification. It is st
21、rongly recommended that in view of the nature of this specification, manufacturers and purchasers should make use of the certification facilities described on the inside back cover of this standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of B
22、ritish 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, pagesi and ii, pages1 to 12, an inside back cover and a back co
23、ver. 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.BS5254:1976 BSI 06-1999 1 1 Scope This British Standard specifies requirements for polypropylene waste pipe and fittings intended
24、 to convey normal domestic effluent. NOTEIf it is intended to use this pipe and these fittings other than in installations for normal domestic effluent it is essential to seek expert advice from the manufacturer on the suitability for the particular application. If the waste pipe is to be installed
25、outside a building and will be subjected to direct sunlight, it may be necessary to protect it from the degradation effects of ultraviolet light. This may be effected by the use of suitable pigments and/or stabilizers in the pipe material but otherwise the pipe should be painted with a suitable pain
26、t which has no deleterious effects on the plastics material. 2 References The titles of the British Standards referred to in this standard are listed on the inside back cover. 3 Material 3.1 The material from which the pipe and fittings are produced shall consist substantially of a suitable grade of
27、 polypropylene copolymer, with only those additives that are needed for the manufacture of the polymer and for its subsequent conversion into sound, durable extrusions or mouldings of good surface finish and mechanical strength. 3.2 The addition of the manufacturers own clean rework material resulti
28、ng from the manufacture of pipe and/or fittings in accordance with this standard is permissible; no other rework material shall be used. 4 Appearance 4.1 The internal and external surfaces of the pipe and fittings shall be clean, smooth and free from grooving and other defects that would impair thei
29、r performance in service. 4.2 The ends of the pipe and fittings shall be square with the axis of the component. 5 Pipe dimensions Pipe shall conform to the relevant dimensions given in Table 1. 6 Fitting dimensions 6.1 Fittings shall conform to the relevant dimensions given in Table 1 and Table 2 an
30、d Figure 1, except that fittings or those parts of fittings not intended to come into contact with the fluid being transported are not required to comply with the wall thicknesses given in Table 1. The effective bore of fittings shall be not less than the minimum bore of the pipe complying with this
31、 standard to which they fit. The positions for the measurement of the minimum wall thicknesses given in Table 1, for a typical design of snap cap, shall be as illustrated in Figure 1d. 6.2 Branch fittings and bends of91 /92 and112 shall be swept and shall have a radius of not less than that shown in
32、 Figure 2 and Figure 3. 6.3 If a connection is to be made to a metal threaded component the thread form shall comply with the requirements of BS21 or BS2779 and shall have a length of engagement of not less than four full threads. 6.4 All thread forms shall have a minimum internal radius of0.25mm. 6
33、.5 All fittings shall comply with the requirements specified in6.1 to6.4. Apart from the specified dimensions, Figure 1 to Figure 3 are only intended to be generally illustrative of the range of fittings. 7 Length of pipe The standard length of pipe as supplied shall be4m. Other lengths may be suppl
34、ied as agreed between the purchaser and the supplier. 8 Marking Each length of pipe and every fitting shall be clearly and durably marked to show manufacturers identification, the number of this British Standard, i.e.“BS5254”, the material code (PP) and the nominal size description as shown in the a
35、ppropriate table or figure. Marking of the pipe shall be at intervals of not more than1m.BS5254:1976 2 BSI 06-1999 9 Heat reversion requirement for pipe When tested by the method described in Appendix A, samples of pipe shall not alter in length by more than1%. At least one test specimen shall be te
36、sted from each24h production batch. 10 Impact requirement for pipe When tested by the method described in Appendix B using an impact energy of24J, compliance shall be judged on the failure rate (a failure being defined as a test specimen fracturing or cracking right through the complete wall thickne
37、ss) as follows: a) if the first14 specimens tested contain no failures the batch of pipe shall be deemed to be satisfactory; b) if the first14 specimens tested contain four or more failures the batch of pipe shall be deemed to be unsatisfactory; c) if the first14 specimens tested contain one, two or
38、 three failures a further28 test specimens shall be tested; if during this further testing the total number of failures exceeds five, the batch of pipe shall be deemed to be unsatisfactory. 11 Hydrostatic pressure requirement When tested by the method described in Appendix C at a pressure of0.7bar 1
39、) , any joint assembly of pipe and fittings shall show no signs of leakage or any other defects. This is a type test and shall be carried out for each formulation used and when any change is made in composition or method of manufacture of pipe or fittings. 12 Stress relief requirement (forinjection
40、moulded fittings only) When an injection moulded fitting is tested by the method described in Appendix D, no part of the weld line shall open completely. For fittings moulded by conventional techniques, special care shall be taken in examining the area around the point of injection where no cracks o
41、r delaminations shall penetrate to a depth greater than50% of the wall thickness. For fittings moulded by end-gating techniques e.g.ring or diaphragm methods, cracks or delaminations in the wall of the fitting adjacent to the injection area shall be parallel to the axis and shall not penetrate to a
42、depth of more than25% of the socket depth. Three samples as moulded shall be tested from each24h production batch. If only one of the three fittings fails to comply with the requirements, a retest is permissible and a further six fittings from the same batch shall be tested. If any of these six fitt
43、ings fails to comply with the requirements, the batch of fittings shall be deemed not to comply with the requirements of this standard. 13 Elevated temperature cycling requirement When tested for2500 cycles by the method described in Appendix E, the following requirements shall be met. a) No leaks s
44、hall have occurred during the test sequence. b) The maximum deflection in any place in the system, between any two adjacent supports, shall be not greater than1/10 of the nominal bore of the pipe. c) Upon completion of the cycling test the system shall be exposed to a static head of1m by plugging th
45、e foot of the soil vent stack and then filling the system with cold water. There shall be no leak in the waste run over a period of10min. d) After the completion of the test, the system, exclusive of the trap, shall be capable of accommodating the passage of a ball of diameter6mm less than the nomin
46、al bore of the pipe. This is a type test and shall be carried out for each formulation used and when any change is made in composition or method of manufacture of pipe or fittings. 1) 1bar=10 5 N/m 2 =100kPa.BS5254:1976 BSI 06-1999 3 14 Joint systems The jointing systems covered in this standard are
47、 based on the use of rubber seals; the most commonly used seal is the “O” ring. The rubber sealing rings supplied with the pipe or fittings shall comply with the requirements of BS2494. Joints and other pipe fittings are illustrated in Figure 1 to Figure 8. Some systems incorporate multi-vane seals
48、which are effective over a wide area of the socket depth. Such joints shall comply with dimension b of Table 2 when measured at the centre of the gasket zone seeFigure 1(b). A further design feature dealt with is the mechanical compression joint. With such joints the depth of the socket shall provid
49、e a minimum distance of10mm beyond the compression zone seeFigure 1(c). The socket depths shown in Figure 1 are designed to operate with maximum lengths of2.5m. Longer lengths may be installed strictly in accordance with the manufacturers instructions. Table 1 Dimensions of polypropylene pipe and fittings Table 2 Dimensions of joint sockets (see Figure 1) Nominal size Mean outside diameter of pipe Tolerance on outside diameter of pipe Minimum wall thickness of pipe and fittings Maximum wall thickness of pipe mm mm mm mm 1/32 1/
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