1、PRODUCT ASSESSMENT SPECIFICATION PAS 25:1999 Plastics frames for use in gully tops and manhole tops for pedestrian areas ICs 93.080.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGH LAW STDmBSI PAS 25-ENGL 1999 1b24bb9 0793487 590 on 16 August 1999 AmdNo. Date PAS 26:1999 comments
2、 Summary of pages This document comprises a front cover, an inside hnt cover, pages i and ii, pages 1 to 4, an inside back cover and a back cover. ISBN O 680 33038 9 STD-BSI PAS 25-ENGL 1799 Lb24bb9 0793488 427 .I PAS 25:1999 Contents Page Foreword ii 1 Scope 1 2 Normative references 3 Plastics mate
3、rials 4 Frames 5 Marking Bibliography 4 Q BSI 08-1999 i STD=BSI PAS 25-ENGL 1999 m 1624669 0793469 363 W PAS 26:1999 Foreword In preparing EN 124, Technical Committee CENl“C165, Wastewater engineering, made provision for manhole tops and gully tops to be made of materials other than those specified
4、in EN 124:1994,6.1.1. BS EN 124:1994,6.1.3 requires that for any other materials all requirements of EN 124 shall be met and that an approved independent body shall establish any other relevant requirements and testing methods. Accordingly, a working group was established to prepare a supplementary
5、specification to BS EN 124 to cover plastics materials used in the construction of frames for manhole tops and gully tops, conforming to BS EN 124, but not for use in the highway. This Product Assessment Specification, PAS 25, has been published to provide an interim specification in the absence of
6、defined performance criteria within BS EN 124. The intention of this Product Assessment Specification is to demonstrate the suitability of certain plastics materials that may be used in frames of manhole tops and gully tops. This Product Assessment Specification contains tests on the plastics materi
7、al of the frame only; some clauses require the use of the compatible cover or grating to be used in the frame. It is not intended that plastics frames should be supplied separately. Units conforming to BS EN 124 have always to be supplied with the cover, or grating, and the frame. This Product Asses
8、sment Specification is not to be regarded as a British Standard. It will be withdrawn upon publication of its content in, or as, a British Standard. Acknowledgement is given to the following organizations who were consulted in the development of this specification: British Plastics Federation; BSI P
9、roduct Services and Standards Development. This Product Assessment Specification has been prepared and published by BSI which retains its ownership and copyright. BSI reserves the right to withdraw or amend this Product Assessment Specification on receipt of authoritative advice that it is appropria
10、te to do so. This Product Assessment specification will be reviewed at intervals not exceeding two years and any amendments arising from the review will be published in an amended Product Assessment Specification and publicized in Update Standards. Product certification. Users of this Product Assess
11、ment Specification are advised to consider the desirability of third-party certification of products conforming to this Product Assessment Specification. This publication does not purport to contain all necessary provisions of a contract. Users are responsible for its correct application. Compliance
12、 with a Product Assessment Specification does not of itself confer immunity from legal obligations. O BSI 08-1999 11 STD-BSI PAS 25-ENGL 1999 e I1624669 0793490 085 PI PAS 26:1999 1 Scope This Product Assessment Specification is applicable to plastics materials used in the manufacture of frames for
13、gully tops and manhole tops, used in Group 1 and 2 areas, as defined in BS EN 124:1994, clause 5. This Product Assessment Specification does not apply to products for use in the highway. It establishes material and performance requirements for plastics materials used in the manufacture of frames con
14、forming to BS EN 124:1994,6.1.3. It specifies the test methods and requirements to be applied but it does not cover arrangements for sampling or for frequency of testing for assessment of conformity, which should be covered contractually. BS EN 124:1994 requires that units shall always be supplied w
15、ith the cover, or grating, and the frame. Some of the performance requirements involve testing of the frame together with the cover, grating or supporting unit with which it is intended to be used. NOTE Attention is drawn to BS 4660, which covers requirements for resistance to surface loadinge for g
16、ully gratings, grating assemblies, rodding eyes and sealing plates, and to BS 7158 which covers requirements for plastics inspection chambere. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this Product Asse
17、ssment Specification. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However parties to agreements based on this Product Assessment Specification are encouraged to investigate the possibility of applying the most recent editions of the normat
18、ive documents indicated below. For undated references, the latest edition of the publication referred to applies. BS 1247-2:1990, Manhole steps - Plastics encapsulated manhole steps. BS 1755-1:1982, Polymer and plastics technology - Glossary of terms used in the plastics industry (BS IS0 472:1988).
19、BS 2782-1:Methods 120A, 120B, 120D and 120331997, Methods of testingplastics - Thermal properties - Determination of Vicat sofiening temperature of thermoplastics (BS EN IS0 306: 1997). BS 2782-1l:Method 1103A1995, Plastics piping and ducting systems - Test method for visually assessing effects of h
20、eating (BS EN 763:1995). BS 3412: 1992, Methods of specifying general purpose polyethylene materials for moulding and extrusion. BS 5139:1991, Method of specifving general purpose polypropylene and propylene copolymer materials for moulding and extrusion. BS EN 124:1994, Gully tops and manhole tops
21、for vehicular and pedestrian areas - Design requirements, type testing, marking, quality control. BS EN 295-3:1991, Vitrified clay pipes and fittings and pipe joints for drains and sewers - Test methods. 3 Plastics materials 3.1 Weathering The material from which the frame is produced shall comprise
22、 one of the following plastics, incorporating or blended with other ingredients as necessary to enable manufacture of a frame conforming to BS EN 124 and other requirements of this Product Assessment Specification, as applicable: a) unplasticized polyvinyl chloride (PVC-U) plastic, to be specified a
23、s black and otherwise in respect of other ingredients and/or properties as appropriate (see 3.2). _II_ Q BSI 08-1999 1 STD-BSI PAS 25-ENGL 1797 M Lb24bb9 0793471 TIIL PAS 25:1999 b) polyethylene (PE) plastic, as defined in BS 1755-1:1982, to be specified as grade W in accordance with BS 3412:1992 in
24、cluding the designation applicable to the method of processing to be used for the manufacture of the frame and in respect of other ingredients andor properties as appropriate; c) polypropylene (PP) plastic, as defined in BS 1755-1:1982, or propylene plastic, as dened in BS 1755-1:1982, (see note) to
25、 be specified in accordance with BS 5139:1991 as light-stabilized and black together with the designation applicable to the method of processing to be used for the manufacture of the frame and in respect of other ingredients and/or properties as appropriate. NOTE For the purposes of this Product Ass
26、essment Specification, PP is used to signify both polypropylene plastics and propylene plastics. 3.2 Vicat softening temperature When tested in accordance with BS 2782-1:Method 120A1997 the plastics material shall have a Vicat softening temperature of not less than 79 “C (method A of BS EN IS0 306:1
27、997). 4 Frames 4.1 Resistance to stress relief 4.1.1 MOUW PVC-U fremes When tested in accordance with BS 2782-1l:Method 1103A (method A of BS EN 763:1995) for 30 min at 150 OC, frames shall satisfy the following requirements as applicable. a) Moulded frames shall show no weld line splitting (see not
28、e). b) For frames with one or more injection points, the depth of crack penetration in the area of the injection point(s) shall be not greater than 2 mm, or not greater than 50 % of the wall thickness at the point of measurement, whichever is the lesser. NOTE Weld lines may become more pronounced an
29、d exhibit localized sinking, but this doea not constitute failure if it is not accompanied by splitting. 4.19 Polypmpykne (PP) jhmes d polyethykne PE) -mes When tested in accordance with BS EN 295-3:1991,16.3 the frame shall have no visible defects. 4.2 Impact redstance of polyolefin frames When sub
30、jected to a single blow by testing in accordance with BS 1247-2:1990, appendix F the frame shall show no visible cracks. NOTE. The presence of stress marking without visible cracks does not constitute failure. 4.3 Impact resistance at low temperature When tested as follows, there shall be no visible
31、 cracking of the frame following the test. The complete frame shall be conditioned at (-10 * 0.5) “C for 4 h. Immediately afterwards the side of the fiame shall be subjected to an impact energy of 12 J (Group 1 area of BS EN 124:1994) or 24 J (Group 2 area of BS EN 124:1994) using the method describ
32、ed in BS 1247-2:1990, appendix F, with an impactor having a hemispherical face of 30 mm radius. 4.4 Thermal stability When tested as follows, in each case, immediately following the test, there shall be no visible cracking of the frame. Two complete frames shall be conditioned for 30 days at a tempe
33、rature of 60 C. The samples shall be allowed to cool to room temperature. One of the samples shall then be subjected to the cold impact test described in 4.3 and the other sample shall be subjected to the permanent set test described in BS EN 124:1994,8.3.1, using an unconditioned cover. 2 Q BSI 08-
34、1999 STD-BSI PAS 25-ENGL 2999 B 3ib24bb9 0793492 958 E PAS 25:1999 48 Resistance to petrol WARNING Fire Hazard Warning and Fume Hazard To Health Warning: Teat method may be dangerous to health. Enaure testing ia undertaken by a auitably competent person. Ensure neceaaary precautwna are taken. When t
35、ested as follows, there shall be: a) no visible deterioration of the frame following the exposure to the reference solution; b) no visible cracking of the frame following the permanent set test. A complete frame shall be positioned face-up in a well-ventilated room at ambient temperature. 200 ml of
36、reference solution (60 % vol. toluene, 40 % vol. n-heptane) shall be poured randomly onto the frame. The reference solution shall be allowed to evaporate off the frame naturally. This procedure shall be repeated at intervals of 24 h I 30 min for a period of 7 days. The frame shall be inspected 24 h
37、* 30 min after the final cycle and any visible deterioration recorded. The frame and cover shall then be subjected to the permanent set test described in BS EN 124:1994,81.1 using an unconditioned cover. 6 Marking Frames shall, in addition to markings conforming to BS EN 124:1994, clause 9, include
38、the following marking in a clear and durable form adjacent to the “BS EN 124:1994“ marking: PAS 25:1999. 0 BSI 08-1999 3 PAS 26:1999 Bibliography BS 4660:1909, Unplasticized polyvinyl chloride PVC-U) pipes and plastics fittings of nominal size 110 and 160 for below ground gravity drainage and sewera
39、ge. BS 7150: 1909, Plastics inspection chambers for drains. 4 O BSI 08-1999 STD*BSI PAS 25-ENGL 1999 II 1h24bb9 0793474 720 H PAS 25:1999 BSI 389ChiswickHighRoad London w4 4AL BSI - British Standards Institution BSI is the independent nationai body responsible for preparing British Standards. It pre
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