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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1452-2:2000 Incorpo
2、rating Corrigenda Nos. 1 and 2 The European Standard EN 1452-2:1999 has the status of a British Standard ICS 23.040.20; 91.140.60 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Plastics piping systems for water supply Unplasticized poly (vinyl chloride) (PVC-U) Part 2: Pipes
3、Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Oct 12 12:43:34 BST 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards C
4、ommittee and comes into effect on 15 May 2000 BSI 10-2000 ISBN 0 580 34880 6 BS EN 1452-2:2000 Amendments issued since publication Amd. No.DateComments 10999 Corrigendum No. 1 July 2000Indicated by a sideline 12005 Corrigendum No. 2 October 2000 Correction to National foreword supersession details N
5、ational foreword This British Standard is the official English language version of EN 1452-2:1999. Collectively, Parts 1, 2, 3, 4 and 5 of BS EN 1452 supersede BS 3505:1986, BS 4346-1:1969 and BS 4346-2:1970. Since those British Standards are the basis of piping systems with a design life of at leas
6、t 50 years, it is intended that they will be declared obsolescent, by 26 June 2001. Collectively, Parts 1 to 5 of BS EN 1452 also partially supersede BS 4346-3:1982, which will be withdrawn or amended by 26 June 2001 to exclude requirements for joints for pressure pipes for water supply. NOTE 1 The
7、UK Water Industry has indicated that this British Standard is to be regarded as superseding the following Water Industry Specifications: WIS 4-31-06, Issue 2: March 1994 Blue unplasticised PVC pressure pipes, integral joints and post-formed bends for cold potable water (underground use) WIS 4-31-07,
8、 Issue 2: March 1994 Unplasticised PVC pressure fittings and assemblies for cold potable water (underground use) The UK participation in its preparation was entrusted by Technical Committee PRI/61, Plastics piping systems and components, to Subcommittee PRI/61/2, Thermoplastics piping sytems and com
9、ponents for pressure applications, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European develop
10、ments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Oct 12 12:43:34 BST 2006, Uncontrolled Copy, (c) BSI BS EN 1452-2:2000 BSI 10-2000i
11、 The responsible UK committee gives the following advice concerning the selection and installation of piping systems and components conforming to this British Standard. a) Water supply companies and other entities are obliged to use Parts 1 to 5 of this suite of European Standards, produced under EC
12、/U mandate, if they wish to purchase PVC-U pipe systems or components within its scope. NOTE 2 Parts 6 and 7 have each been prepared as an ENV (pre-standard), to allow further development, and their use is voluntary unless invoked contractually. b) Sub-clause 5.2 enables the selection of pipe colour
13、s from grey, blue and cream. It has been the practice of UK water companies to use blue, metric PVC-U pipes (conforming to WIS 4-31-06), to facilitate identification of potable water pipelines. For buried applications in the United Kingdom, attention is drawn to the recommendations of the National J
14、oint Utilities Group (NJUG) concerning the colour coding of pipelines and other services. For UK public water supply applications, the pipes should also be marked with the word WATER. Purchasers still requiring grey, Imperial (inch) -sized pipes should refer to normative annex B. The sizes equate to
15、 those of BS 3505:1986. Apart from the UK fracture toughness requirements, all other requirements are as in the main text of BS EN 1452-2:2000. c) Table 2 covers a nominal outside diameter (dn) of 12 to 1 000 and a nominal pressure PN range from 6 bar to 25 bar. In order not to use very thin wall PV
16、C-U pipes and to benefit from rationalization, the UK water company range had been limited to PN 8 pipes in nominal outside diameters 90 mm to 630 mm, inclusive, and PN 12.5 pipes from 63 mm to 630 mm; the overall service (design) coefficient (C) was 2.0 for all sizes. In developing EN 1452-2, a com
17、promise required the increase of C to 2.5 for nominal outside diameters up to and including dn90. For most PNs this has had the effect of increasing the maximum and minimum wall thickness values for dn90 pipe to 0.1 mm above those for dn110 pipe (in practice the wall thicknesses will probably be the
18、 same for these two diameters). Thus, if the same diameters and PNs are selected as previously, no pipe will have a wall thickness less than 3.5 mm. d) In 6.6.2, the requirements allow the wall thickness of the ring seal groove to be less than the minimum wall thickness of the pipe by up to 20 %. Th
19、e UK Technical Committee recommends that the minimum wall thickness of the sealing ring groove is not less than the nominal (minimum ) wall thickness for the pipe. This may be achieved by e.g. local thickening of the socket wall or by using an external sleeve. e) In Table 5, the depths of engagement
20、 given for sockets are minimum depths. It has been UK practice to use depths larger than the minimum (thus still permitted). f) For the purposes of 8.1, no purchaser selection decisions are required to be made with respect to the 0 C impact test; PN 8 pipes are required to conform to level H require
21、ments and PN 12.5 pipes to the level M requirements given in Table 6. g) In 8.2, for testing of pipes, the second paragraph allows either of two types of end caps to be used without identifying which of these alternatives is to be the reference condition in case of dispute. Since use of these two ty
22、pes of end caps is not expected to always give identical results, users of this standard should agree which type of end cap shall comprise the reference method in case of dispute. This comment also applies to the fourth paragraph, for the testing of integral sockets. Licensed Copy: Institute Of Tech
23、nology Tallaght, Institute of Technology, Thu Oct 12 12:43:34 BST 2006, Uncontrolled Copy, (c) BSI BS EN 1452-2:2000 ii BSI 10-2000 h) In Table 9, attention is drawn to the normative note 2) and hence to annex C and to note 2 to Table 11 of ENV 1452-7, which permits fracture toughness test requireme
24、nts to be specified for UK applications as an alternative to the gelation test requirements specified in Table 9. It is strongly recommended that purchasers for UK applications adopt this option on a contractual basis. i) In the case of pipes which also conform to other standards, attention is drawn
25、 to 14.3.1 concerning marking. j) In Table B.4 Dimensions of sockets for solvent cementing, the committee considers that a typographical error has been carried over for nominal size 8 (in), in that the value for the minimum mean inside diameter of socket at midpoint of the socket length, dim,min.sho
26、uld be 219,0 not 218,0. (The value of 219,4 for dim,maxis correct.) k) For the purposes of B.5 and annex C to provide for UK needs for fracture toughness requirements, the UK has been made aware of a mismatch or error in the references to symbols for use of annex C in conjunction with the currently
27、available (1999) ISO/DIS 11673. To avoid an erroneous double application of a correction factor and for consistency with the current and intended details of the test method, the values specified in Table C.1 of EN 1452-2 should be regarded as minimum values for Kcand not for Kic. l) In annex C, the
28、significance of alternative test is unclear. See UK comments on Table 9, note 2). Bearing in mind the status of ENV 1452-7, users of this standard should declare or agree which test method and requirements apply in case of dispute. Cross-references The British Standards which implement international
29、 or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. WARNING This British Standard, which is identical with
30、EN 1452-2:1999, does not necessarily detail all the precautions necessary to meet the requirements of the Health and Safety at work etc. Act 1974. Attention should be paid to any appropriate safety precautions and the test methods should be performed only by trained personnel. Regulation 25 of the W
31、ater Supply (Water Quality) Regulations 1989 specified the circumstances in which water undertakers may use products in contact with public water supplies in England and Wales. All pipes used to convey public water supplies must be approved under the provisions of regulation 25(1)(a) in order to ens
32、ure that use will not cause adverse effect on water quality or risk to health of consumers. Similar provisions apply in Scotland and Northern Ireland. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their corre
33、ct 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 and ii, the EN title page, pages 2 to 30, an inside back cover and a back cover. The BSI copyright noti
34、ce displayed in this document indicates when the document was last issued. Sidelining in this document indicates the most recent changes by amendment. Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Thu Oct 12 12:43:34 BST 2006, Uncontrolled Copy, (c) BSI ? ? ? ? ? ? ? ? !“
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40、rolled Copy, (c) BSI BS EN 1452-2:2000 BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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