1、BRITISH STANDARD BS3746:1990 Specification for PVC garden hoseBS3746:1990 This British Standard, having been prepared under the directionof the Rubber StandardsPolicy Committee, waspublished under the authorityof the Board of BSIandcomes into effect on 30September1990 BSI08-1999 First published May1
2、964 Second edition September1990 The following BSI references relate to the work on this standard: Committee referenceRUM/9 Draft for comment88/43332DC ISBN 0 580 18428 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Rubber Standards P
3、olicy Committee (RUM/-) to Technical CommitteeRUM/9, uponwhich the following bodies were represented: Association of Metropolitan Authorities British Coal Corporation British Compressed Gases Association British Gas plc British Railways Board British Rubber Manufacturers Association Chief and Assist
4、ant Chief Fire Officers Association Energy Industries Council Fire Extinguishing Trades Association Home Office Institution of Fire Engineers Liquefied Petroleum Gas Industry Technical Association (UK) London Fire and Civil Defence Authority London Regional Transport Malaysian Rubber Producers Resea
5、rch Association Ministry of Defence Society of Motor Manufacturers and Traders Ltd. Amendments issued since publication Amd. No. Date CommentsBS3746:1990 BSI 08-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Classification 1 3 Materials and construction 1 4 Di
6、mensions and tolerances 1 5 Physical requirements of the finished hose 1 6 Marking and packaging 2 Appendix A Seam splitting test apparatus 3 Appendix B Use and care of PVC hoses 3 Figure 1 Apparatus for seam splitting test 3 Table 1 Bore dimensions and wall thicknesses 1 Table 2 Hydrostatic test re
7、quirements 1 Table 3 Requirements for cold flex test and loss of mass on heating 2 Publications referred to Inside back coverBS3746:1990 ii BSI 08-1999 Foreword This British Standard, prepared under the direction of the Rubber Standards Policy Committee, is a revision of BS3746:1964 which is withdra
8、wn. Changes from the previous edition include the following. a) The original specification has been replaced by two types, a reinforced flexible PVC hose and an unreinforced PVC hose. b) A further type, specifying a layflat hose, has been added together with a specific test for seam splitting for th
9、is type. c) A test for compatibility with fittings has been introduced. 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 im
10、munity from legal obligations. Summary of pages This document comprises a front cover, an 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 a
11、mendment table on the inside front cover.BS3746:1990 BSI 08-1999 1 1 Scope This British Standard specifies dimensional and performance requirements for three types of PVC garden hose in a range of sizes. Hoses complying with this specification are designed for use with cold water at working pressure
12、s up to7bar 1) . They are not intended for use with potable water, beverages and food stuffs. Appendix B gives recommendations for the care of PVC hoses to prolong service life. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Classification The
13、hose shall be supplied as a hose or an assembly. NOTEPurchaser and supplier may agree whether the hose is supplied as a hose or an assembly. Three types of hose are specified: a) type A: unreinforced flexible PVC suitable for applications up to7bar working pressure where valving off at the outlet is
14、 not required; b) type B: reinforced flexible PVC suitable for applications up to7bar working pressure where greater dimensional stability under working pressure is required and valving off at the outlet may be required; c) type C: as for type B but manufactured in a layflat form to enable winding o
15、nto a storage reel. 3 Materials and construction Type A shall be extruded from a flexible PVC compound and the finish shall be smooth or fluted. Types B and C shall consist of: a) lining extruded from flexible PVC; b) a natural or synthetic reinforcement; c) a cover extruded from flexible PVC which
16、shall have a smooth or fluted finish. NOTEThe colour of the cover may be different from the lining. The extrusion shall be as uniform as is commercially practicable in its physical properties, fully gelled and free from visible cracks, porosity, foreign inclusions and other defects that might affect
17、 serviceability. The flexible PVC compound shall be manufactured from a polymer of vinyl chloride or a copolymer, the major constituent of which shall be vinyl chloride with plasticizing and other suitable ingredients. The plasticized material used in the manufacture of the product shall not contain
18、 di-n-butyl phthalate (DBP) or di-isobutyl phthalate (DIBP) plasticizers since these can lead to a whitening of plant leaves when used in horticultural applications (phytotoxicity). The material shall have a relative density at20 C of not more than1.45. 4 Dimensions and tolerances When measured in a
19、ccordance with method4.1 and method7.1 of BS5173-101.1:1985, all types of hose shall comply with the bore dimensions and wall thicknesses given in Table 1. Table 1 Bore dimensions and wall thicknesses 5 Physical requirements of the finished hose 5.1 Hydrostatic test requirements When tested in accor
20、dance with clause 9 of BS5173-102.1:1985 the hose shall comply with the minimum burst pressure and proof pressure given in Table 2. When tested in accordance with 7.2.3 of BS5173-102.1:1985 at a working pressure of7bar the hose shall comply with the maximum diameter increase given in Table 2. Table
21、2 Hydrostatic test requirements 1) 1bar=10 5 N/m 2 =10 5 Pa. Nominal bore Allowed limits Maximum wall thickness a Minimum wall thickness a mm 12.5 16 19 mm mm 2.8 3.2 4.0 mm 1.5 2.0 2.4 a In the case of fluted hoses this measurement shall be taken between the base of the flutes and the inside wall.
22、Minimum burst pressure Proof pressure Increase in diameter at7bar to be not greater than: Type A Type B Type C bar 17.5 24 24 bar 10 14 14 % 25 25 25 +0 0.8 +0 0.8 +0 0.8BS3746:1990 2 BSI 08-1999 5.2 Compatability with fittings When hoses are supplied with fittings an acceptability test shall be car
23、ried out to satisfy that there are no leaks after the assembly has been subjected to the proof pressure indicated in Table 2 for a duration of not less than30min. 5.3 Seam splitting test (Type C only) When tested in accordance with Appendix A all six samples shall not split or show evidence of split
24、ting when subjected to a minimum of25000cycles each. 5.4 Cold flex requirements When tested in accordance with BS2782:Method150B the flexible PVC compound used to manufacture the hose shall comply with the maximum temperature given in Table 3. 5.5 Loss of mass on heating When tested in accordance wi
25、th BS2782:Method465B the flexible PVC compound used to manufacture the hose shall comply with the loss of mass on heating given in Table 3. Table 3 Requirements for cold flex test andloss of mass on heating 5.6 Colour bleeding When tested in accordance with BS2782:Method542A the flexible PVC compoun
26、d used to manufacture the hose shall show no more than moderate colour bleeding. 5.7 Bending tests (Types A and B only) The hose shall be manufactured such that the minimum bend radius is12 nominal bore. When the hose is tested in accordance with methodA of BS5173-103.5 with a bend radius of12 the n
27、ominal bore, the value of T/D shall be not less than0.80. 6 Marking and packaging Each length of hose or package of hose shall have a label attached to it giving the following information: a) the manufacturers name or identification; b) the number of this British Standard and the type; c) the batch
28、reference; d) the nominal bore; e) the length in metres; f) the month and year of manufacture e.g.MN/BS3746 Type A/B.REF/16/25m/12-89. NOTEWhen hose is sold in packages the information may be indelibly indicated on the package. The following warning shall also be given on thelabel: “THE HOSE SHOULD
29、NOT BE USED FOR POTABLE WATER, BEVERAGES AND FOOD STUFFS”. Cold flex temperature before ageing(max.) Cold flex temperature after ageing(max.) Loss of mass on heating 0 C 5 C 7 %BS3746:1990 BSI 08-1999 3 Appendix A Seam splitting test apparatus The apparatus shall be arranged so that the valve cams o
30、perate two valves feeding air at7bar to two samples working a cycle where they shall be pressurized for3s and the pressure then released for a further3s. The samples shall have a plugged fitting attached at one end, the other end being attached to the air feed. The plane of the lay flat shall be as
31、shown in Figure 1 and be plugged and restrained in such a manner that the sample when not inflated takes up a natural position. Six samples shall be tested from each production batch, three in air and three in water. Two1m5mm test lengths shall be fitted to the apparatus. Sample A shall be tested at
32、 an ambient air temperature of23 2 C. Sample B shall be tested immersed in water which is maintained at a temperature of12 2 C. Appendix B Use and care of PVC hoses A prolonged service life may be obtained from the hose if the following precautions are taken. a) Never leave the water shut off at the
33、 nozzle. b) Do not use with steam or with hot water. c) Keep away from sharp objects and cutting tools. d) Do not run over the hose with a car, lawn mower, wheel barrow etc. e) Store away without kinks or twists in the hose and preferably in a place where the hose will not be subjected to direct sun
34、light or heat. f) Ensure that the hose is completely drained after use. Figure 1 Apparatus for seam splitting test4 blankBS3746:1990 BSI 08-1999 Publications referred to BS2782, Methods of testing plastics. BS2782:Method 150B, Determination of cold flex temperature of flexible polyvinyl compound. BS
35、2782:Methods 465A and 465B, Determination of loss of plasticizers (activated carbon method). BS2782:Method 542A, Qualitative evaluation of bleeding of colorants. BS5173, Methods of test for rubber and plastics hoses and hose assemblies. BS5173-101.1, Measurement of dimensions (excluding length). BS5
36、173-102.1, Hydrostatic tests. BS5173-103.5, Bending tests. BS3746:1990 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international leve
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