1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 6076 : 1996 ICS 83.140
2、 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Specification for Polymeric film for use as a protective sleeving for buried iron pipes and fittings (for site and factory application)This British Standard, having been prepared under the direction of the Engineering Sector Boa
3、rd, was published under the authority of the Standards Board and comes into effect on 15 November 1996 BSI 1996 First published June 1981 Second edition November 1996 The following BSI references relate to the work on this standard: Committee reference PSE/10 Draft for comment 91/82094 DC ISBN 0 580
4、 25573 5 BS 6076 : 1996 Amendments issued since publication Amd. No. Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Sector Board for Engineering to Technical Committee PSE/10, Iron pipes and fittings, upon which the f
5、ollowing bodies were represented: Adhesive Tape Manufacturers Association British Foundry Association Ductile Iron and Pipe Committee Institute of British Foundrymen Institution of Mechanical Engineers Institution of Water and Environmental Management Pipeline Protection Association Society of Briti
6、sh Water Industries Water Companies Association Water Research Centre Water Services Association of England and WalesBS 6076 : 1996 BSI 1996 i Contents Page Committees responsible Inside front cover Foreword ii Introduction iii Specification Section 1. General 1.1 Scope 1 1.2 Normative references 1
7、1.3 Definitions 1 1.4 Appearance 1 Section 2. Tubular polymeric film for site application 2.1 Composition 2 2.2 Additives and residuals 2 2.3 Reworked material 2 2.4 Film structure 2 2.5 Dimensions 2 2.6 Properties 2 2.7 Marking 3 2.8 Packaging, distribution and storage 3 Section 3. Sheet polymeric
8、film for factory application 3.1 Composition 4 3.2 Additives and residuals 4 3.3 Reworked material 4 3.4 Film structure 4 3.5 Dimensions 4 3.6 Mechanical properties 4 3.7 Reel parameters 5 Section 4. Factory application of film to pipe 4.1 Adhesive 6 4.2 Application of hot melt adhesive to film 6 4.
9、3 Adhesive joint type tests 6 4.4 Application of film to the pipe surface 6 4.5 Marking 7 Section 5. Certification 5.1 Manufacturers certificate 8 Section 6. Repair of damaged sleeving before or during installation of pipeline 6.1 General 9 6.2 Repair material 9 Tables 1 Layflat width of tubular pol
10、ymeric film for various sizes of iron pipe 2 2 Required mechanical properties for the two types of site-applied sleeving 3 3 Required mechanical properties for the three types of factory-applied sleeving 5 Figures 1 Position of film on spigot end of pipe 7 2 Position of film on socket end of pipe 7
11、List of references Inside back coverii BSI 1996 BS 6076 : 1996 Foreword This British Standard has been prepared by Technical Committee PSE/10 and supersedes BS 6076 : 1981 which is withdrawn. Section 2 of this standard is based on the first publication of BS 6076 : 1981 and is exclusively for tubula
12、r polymeric sleeving for site application. Sections 3 and 4 are exclusively for factory application of sheet form polymeric film to ductile iron pipe and are based on current practices and on tests carried out by the Ductile Iron Pipe Association, the Water Research Centre and sleeving film manufact
13、urers. Product Certification Users of this British Standard are advised to consider the desirability of third party certification of product conformity with this British Standard based on testing and continuing product surveillance, which may be coupled with assessment of a suppliers quality systems
14、 against the appropriate Part of BS EN ISO 9000. Enquiries as to the availability of third party certification schemes will be forwarded by BSI to the Association of Certification Bodies. If a third-party certification scheme does not already exist, users should consider approaching an appropriate b
15、ody from the list of association members. This standard is not intended to limit the development of alternative materials which perform at least as well in terms of performance required by this standard. Compliance with a British Standard does not of itself confer immunity from legal obligations. BS
16、I 1996 iii BS 6076 : 1996 Introduction This British Standard has been based on the current practices used in protecting underground iron pipes and fittings from corrosion in aggressive soils. Polymeric film in the tubular form was first used as a protection medium in America in 1951. It has proved t
17、o be an effective way of combating corrosion and is now used for this purpose throughout the world. The tubular film is sleeved over the pipes and fittings immediately prior to laying and the overlap at the joints made to provide a close fit along the pipeline. Polymeric film in the sheet form is ap
18、plied to the pipe in the factory by the cigarette wrapping technique. Joints and fittings in a factory sleeved pipeline are protected in situ by suitable means.iv blankSection 1 BS 6076 : 1996 BSI 1996 1 Section 1. General 1.1 Scope This British Standard specifies the composition, structure, mechani
19、cal properties, sizes, testing, marking and appearance requirements of both tubular polymeric film for site application and sheet polymeric film for factory application to ductile iron pipes. This British Standard also specifies requirements for the factory application of sheet sleeving and the repa
20、ir of sleeving before or during installation of the pipeline. 1.2 Normative references This British Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are made at the appropriate places in the text and the cited publications are liste
21、d on the inside back cover. For dated references, only the edition cited applies; any subsequent amendments to or revisions of the cited publication apply to this standard only when incorporated in the reference by amendment or revision. For undated references, the latest edition of the cited public
22、ation applies, together with any amendments. 1.3 Definitions For the purposes of this British Standard, the following definitions apply. 1.3.1 layflat width Width of a flattened tube which is equal to half the circumference. 1.3.2 window Hole that may occur in individual layers of polyethylene film
23、when producing multi-layered film. 1.3.3 machine direction Circumferential direction of the film as applied to the pipe. 1.3.4 transverse direction Longitudinal direction of the film as applied to the pipe. 1.3.5 circumferential edge Edge of the film that fits circumferentially around the pipe. 1.3.
24、6 longitudinal edge Edge of the film that fits along the barrel of the pipe. 1.3.7 cigarette wrap Covering which is applied in sheet form to a tube, the leading edge being parallel to the longitudinal edge of the tube. 1.3.8 adhesive deposition pattern Appearance or form in which the adhesive is app
25、lied to the film. NOTE. The pattern may be for example a continuous band, overlapping spirals or zig-zag. 1.3.9 scrim layer Layer of reinforcing material (e.g. woven polymeric) supplied in sheet form. 1.4 Appearance The colour of the films shall be in accordance with BS 4800 : 1989, i.e. blue (18E51
26、 to 18E53), black (00E53) or yellow (10E50 to 10E55), or red (04D43 to 04D45). NOTE.1. Shade variations inherent in the manufacturing process are permissible. NOTE.2. The following colour coding is recommended: blue for potable water pipelines, red or black for sewerage and non-potable water and yel
27、low for gas.2 BSI 1996 BS 6076 : 1996 Section 2 Section 2. Tubular polymeric film for site application 2.1 Composition The film shall be manufactured from polyethylene, or from a blend of polyethylene and/or a copolymer of ethylene and higher olefins. NOTE. A well dispersed carbon black pigment, ant
28、ioxidants and slip agents may be included. 2.2 Additives and residuals Antioxidants shall not exceed 0.5 % (m/m). Colouring agents shall not exceed 3.0 % (m/m). The material shall not contain any plasticizers or fillers (other than the colouring agent). The impurities in the material, excluding perm
29、itted amounts of colouring agent or antioxidant, shall not exceed 0.1 % (m/m). The ash from the film, after ignition at 800 C shall not exceed 2.0 % (m/m). 2.3 Reworked material The film shall not contain any regenerated products other than clean rework material, of the appropriate colour generated
30、by the manufacturers own production. The proportion of rework material shall not exceed 20 % (m/m) in any batch. 2.4 Film structure 2.4.1 Structure of the film The film shall be one of the following two types: a) a single layer extruded as a tube and supplied in layflat form; or b) a cross laminate
31、of two or more layers laid so that the extrusion directions of consecutive layers form an angle with each other. NOTE 1. Film is normally supplied in sheet form for later conversion into tubular form. The film shall not contain holes, splits, splices, perforations or other through thickness disconti
32、nuities. NOTE 2. Special requirements apply to laminated films only (see 2.4.2 and 2.6.4). 2.4.2 Requirements for laminated film only The film layer shall be properly and completely bonded together with no local tendency to delamination (see 2.6.4). Windows in one of the single layers of the film sh
33、all be permitted. Their frequency shall not exceed 5 per 1000 m of running length and their dimensions shall not exceed 2500 mm 2 , or over 100 mm in any direction. Splices in one of the single layers shall be permitted. Their frequency shall not exceed 2 per 1000 m of running length. To avoid short
34、 roll lengths, through film splices shall be allowed at not more than 1 per 1000 m reel. Their presence shall be clearly identified. 2.5 Dimensions 2.5.1 For all types of film (see 2.4.1) the mean film thickness shall be 225mm 25mm, when measured in accordance with BS 2782 : Part 6 : Method 631A : 1
35、993. For film whose thickness can be measured directly, when measured in accordance with BS 2782 : Part 6 : Method 630A : 1994, the minimum thickness at any point shall be not less than 185mm. 2.5.2 The nominal layflat width of the tubular film shall conform to the dimensions given in table 1. NOTE.
36、 Table 1 gives the minimum dimensions for push-in and mechanical joints. 2.5.3 The tolerance on width of the tube shall be 2.5 %. Table 1. Layflat width of tubular polymeric film for various sizes of iron pipe Pipe size (DN) Layflat width of tubular polymeric film (mm) For use with pipeline incorpor
37、ating mechanical flexible joints For use with pipeline incorporating push-in flexible joints 80 280 100 450 280 150 550 400 200 650 550 250 700 650 300 800 700 350 800 400 1100 1100 450 1100 1100 500 1350 1350 600 1350 1350 700 1750 1750 800 1750 900 2000 1000 2000 1100 2500 1200 2500 1400 3500 1600
38、 3500 2.6 Properties 2.6.1 Visual The film shall be free from tears, voids, pinholes and other discontinuities.Section 2 BS 6076 : 1996 BSI 1996 3 1) Marking BS 6076 : 1996 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufa
39、cturer that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the claimants responsibility. Such a declaration is not to be confused with third party certification of conformity, which may also be desirable. 2.6.2 Tensile strength When tested in accord
40、ance with BS 2782 : Part 3 : Method 326C : 1977, the ultimate tensile strength of the film in both the longitudinal and circumferential directions shall be not less than the value shown in table 2. NOTE. This is equivalent to 11 MPa, assuming a film thickness of 200mm. 2.6.3 Elongation When tested i
41、n accordance with BS 2782 : Part 3 : Method 326C : 1977, the elongation at break of the film in both the longitudinal and circumferential directions shall be not less than the value shown in table 2. 2.6.4 Lamination peel strength When tested in accordance with BS 5350 : Part C12 : 1994 the laminate
42、d film shall have a lamination peel strength of not less than the value shown in table 2. Table 2. Required mechanical properties for the two types of site-applied sleeving Mechanical property Type of film Clause Single layer film Cross laminate film Tensile strength 1) (N) 44 44 2.6.2 Elongation (%
43、) 300 300 2.6.3 Lamination peel strength 1) (N) 12.6.4 1) The values given in the table are for a 20 mm sample width. 2.7 Marking The tubular film supplied shall bear a card or label containing the following information:- a) the manufacturers name and/or trade name; b) the number of this British Sta
44、ndard, i.e. BS 6076 : 1996 1) ; c) the type of film, e.g. Section 2 type film; d) the layflat width and length of the film. 2.8 Packaging, distribution and storage 2.8.1 The film shall be supplied in rolls on cores of internal diameters not less than 75 mm. 2.8.2 The rolls shall be suitably supporte
45、d and protected from damage during storage and distribution. NOTE. Exposure to direct sunlight of film that does not contain carbon black should be kept to the minimum practical level.4 BSI 1996 BS 6076 : 1996 Section 3 Section 3. Sheet polymeric film for factory application 3.1 Composition The mate
46、rial used for making the film shall be any or a mixture of the following: polyethylene, elastomers, and polyolefins and their copolymers. 3.2 Additives and residuals Antioxidants shall not exceed 0.5 % (m/m). Colouring agents shall not exceed 3.0 % (m/m). The material shall not contain any plasticiz
47、ers or fillers (other than the colouring agent). The impurities in the material, excluding permitted amounts of colouring agent or antioxidant, shall not exceed 0.1 % (m/m). The ash from the film, after ignition at 800 C shall not exceed 2.0 % (m/m). 3.3 Reworked material The film shall not contain
48、any regenerated products other than clean rework material, of the appropriate colour generated by the manufacturers own production. The proportion of rework material shall not exceed 20 % (m/m) in any batch. 3.4 Film structure 3.4.1 Structure of the film The film shall be one of the following three
49、types: a) a single layer in sheet form; b) a cross laminate of two or more layers manufactured in sheet form and laid so that the extrusion directions of consecutive layers form an angle with each other; NOTE. Special requirements apply to laminated films only (see 3.4.2 and 3.6.6). c) a reinforced multi-layer consisting of type (a) or type (b) films reinforced with a scrim layer (e.g. polymeric) to give increased tear resistance and rigidity. The film applied to the pipe shall not contain holes, splits, splices, perforations or other through th
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