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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 7892:2000 Incorporatin
2、g Corrigendum No. 1 ICS 23.040.10; 25.220.60 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Specification for seal coats on cement mortar lined ductile iron pipes and fittings Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:34:46 GMT+0
3、0:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Sector Committee for Engineering, was published under the authority of the Standards Committee and comes into effect on 15 October 2000 BSI 04-2001 First published August 1997 Second edition
4、October 2000 The following BSI references relate to the work on this standard: Committee reference PSE/10 Draft for comment 99/709721 DC ISBN 0 580 28275 9 BS 7892:2000 Amendments issued since publication Amd. No.DateComments 12085 Corrigendum No. 1 April 2001Indicated by a sideline Committees respo
5、nsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PSE/10, Iron pipes and fittings, upon which the following bodies were represented: Adhesive Tape Manufacturers Association British Compressed Gases Association British Foundry Association D
6、uctile Iron Pipe Committee Institute of British Foundrymen Institution of Mechanical Engineers Society of British Water Industries Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:34:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7892:2000 BSI 04-2001i Conte
7、nts Page Committees responsibleInside front cover Forewordii Introduction1 1Scope1 2Normative references1 3Terms and definitions1 4Type test requirements2 4.1Water quality (pH)2 4.2Durability2 4.3Abrasion resistance2 5Routine test requirements2 5.1General2 5.2Visual appearance2 5.3Coating thickness2
8、 5.4Adhesion2 5.5Odour3 6Marking3 Annex A (normative) Water quality (pH)4 Annex B (normative) Durability type test for seal coats4 Annex C (normative) Abrasion type test for seal coats5 Annex D (normative) Dry coating thickness measurement using test film6 Annex E (normative) Adhesion test8 Annex F
9、(normative) Odour test9 Bibliography11 Figure B.1 Schematic diagram of durability rig5 Figure C.1 Schematic diagram of abrasion test rig6 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:34:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii BSI 04-2001 BS 7892:2
10、000 Foreword This British Standard has been prepared by Technical Committee PSE/10, Iron pipes and fittings and is a revision of BS 7892:1997 which is withdrawn. WARNINGThis specification calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are no
11、t taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage. Product certification Users of this British Standard are advised to consider the desirability of third-party certification of product conformity with this
12、 British Standard based on testing and continuing surveillance, which may be coupled with assessment of a suppliers quality systems 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 Cer
13、tification Bodies. If a third-party certification scheme does not already exist, users should consider approaching an appropriate body from the list of association members. Annexes A to F are normative. A British Standard does not purport to include all the necessary provisions of a contract. Users
14、of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Attention is drawn to the following statutory regulations. Water Supply (Water Quality) Regulations 1989 as amended by the Water Supply (W
15、ater Quality) (Amendment) Regulations 1991 1 (in particular Regulation 25). The Water Supply (Water Quality) (Scotland) Regulations 1990 2 (in particular Regulation 25). Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 11 and a back cover. The
16、 BSI copyright notice displayed in this document indicates when the document was last issued. Sidelining in this document indicates the most recent changes by amendment. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:34:46 GMT+00:00 2006, Uncontrolled Copy,
17、(c) BSI BS 7892:2000 BSI 04-20011 | | | | | Introduction The intended purpose of the seal coat is to control leaching of lime (CaOH2) and other hydroxides from the cement into the water supply such that the pH of conveyed water is maintained below 9.5 during normal use. A pH of 9.5 is the maximum pr
18、escribed value permitted by the Water Supply (Water Quality) Regulations 1989 as amended by the Water Supply (Water Quality) (Amendment) Regulations 1991 1 and the Water Supply (Water Quality) (Scotland) Regulations 1990 2. The seal coat is also intended to control leaching of other deleterious mate
19、rials which could cause their maximum permitted concentration or value to be exceeded. Attention is drawn to the fact that National or International Water Supply or Water Quality Regulations, effective within the region, may apply when seal coated surfaces come into contact with, or are likely to co
20、me into contact with, potable water, when used: a) in accordance with the product manufacturers instructions for use; and b) under any other appropriate conditions defined for that product within any published list of substances, products and processes approved to those Water Supply or Water Quality
21、 Regulations. Seal coatings are usually specified where the pipeline is to convey soft water, and/or where water residence times are very long. Supply water quality data for such pipelines should be discussed between the prospective client and the manufacturer of the product so as to ensure the suit
22、ability of the product for use. 1 Scope This British Standard is issued to satisfy the requirements of both users and suppliers for a standard specification for seal coats on cement mortar linings in ductile iron pipes and fittings. It specifies requirements for seal coatings for factory application
23、 to the surface of cement mortar linings which are factory applied to the interior of ductile iron pipes and fittings. This standard is applicable to products for potable and other water applications. This standard gives requirements for routine testing for visual appearance, coating thickness, adhe
24、sion and odour; it also gives type test requirements for water quality effects (pH), durability, and abrasion resistance. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this British Standard. For dated refer
25、ences, subsequent amendments to, or revisions of, any of these publications do not apply. For undated references, the latest edition of the publication referred to applies. BS 3887:1991, Specification for pressure sensitive adhesive closing and sealing tapes. BS 3900-C.5:1997, Methods of test for pa
26、ints Group C: Tests associated with paint film formation Part C5: Determination of film thickness. BS 6068-2.50:1995, Water quality Part 2: Physical, chemical and biochemical methods Section 2.50: Determination of pH. 3 Terms and definitions For the purposes of this British Standard the following te
27、rms and definitions apply: 3.1 ductile iron cast iron in which graphite is present substantially in spheroidal form 3.2 fitting casting other than a pipe which allows pipeline deviation or change of direction or bore NOTEFlanged-socket pieces, flanged-spigot pieces and collars are classified as fitt
28、ings. 3.3 test film film of consistent thickness and density, morphologically stable at the temperature of the substrate during seal coat application, used as a surrogate surface for the measurement of coating thicknesses 3.4 pipe casting of uniform bore, straight in axis, having either spigot, sock
29、et, flange or plain ends NOTEThis does not include flanged socket pieces, flanged spigot pieces and collars, which are classified as fittings. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:34:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 BSI 04-2001 BS 78
30、92:2000 | | | 3.5 product seal coated, cement mortar lined iron pipe or fitting 3.6 seal coat coating applied over a cement mortar lining to control the interactions between the lining and the contents of the main 3.7 type test proof of design test which is done once and only repeated after change o
31、f design 4 Type test requirements 4.1 Water quality (pH) When tested in accordance with annex A, the pH of the test water shall not exceed 9.5. 4.2 Durability When tested for a period of six months in accordance with annex B the pH of the test water shall not exceed 9.5 after a 24 hour contact time.
32、 4.3 Abrasion resistance When tested in accordance with annex C, the pH of the test water shall not exceed 9.5. 5 Routine test requirements 5.1 General Coating and re-work procedures (e.g. drying regimes for solvent based coatings and mixing and curing regimes for multi-component materials) shall be
33、 defined by the manufacturer of the product in agreement with the seal coat supplier, where necessary, such as to enable the product to conform to the requirements of this standard. The tests specified in 5.2 to 5.5 shall be carried out on factory seal coated pipes or fittings as opposed to separate
34、ly prepared test pieces. Sampling plans for the tests specified in 5.2 to 5.5, specific to the seal coating material used, the size of the batch and the storage conditions, shall be specified by the coater for each batch of product. Where a non-conforming product is identified, the product shall be
35、re-worked such that it meets the requirements of this standard, or rejected. 5.2 Visual appearance When examined visually, the seal coat shall be free of any defects likely to be detrimental to coating performance. The manufacturer of the product shall define those defects taking into account the na
36、ture of the seal coat material. 5.3 Coating thickness When tested in accordance with BS 3900-C.5:1997, method 1A, or annex D of this standard, the wet or dry coating thickness shall be within the limits specified by the manufacturer of the product in conjunction with the seal coat supplier, where ne
37、cessary. 5.4 Adhesion When tested in accordance with annex E, the adhesive strength shall fall within the range of 1 to 3. Adhesive failure of the seal coat to substrate bond shall be considered a fail. A cohesive failure within the seal coat or within the mortar (evidenced by a white/grey layer on
38、the underside of the detached coating) shall not be considered as a fail in this test. The area damaged during testing shall be repaired in accordance with a procedure defined by the manufacturer of the product in agreement with the seal coat supplier, where necessary. Licensed Copy: London South Ba
39、nk University, London South Bank University, Fri Dec 08 11:34:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7892:2000 BSI 04-20013 1) Marking BS 7892:2000 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the
40、 product meets the requirements of the standard. The accuracy of the claim is solely the claimants responsibility. Such a declaration is not to be confused with third-party certification of conformity. | | | | | 5.5 Odour When tested in accordance with annex F, no significant difference in odour sha
41、ll be detectable, by inhalation, between test water and tap water. NOTE 1It is not normally considered necessary to test fittings for odour as they generally only constitute a minor proportion of a main; however, some installations are fittings intensive (for instance pumping stations) and odour tes
42、ts should therefore be carried out on seal coated fittings by agreement between the manufacturer and the customer. NOTE 2Some seal coat materials (for instance solvent-based single pack coatings) which dry by solvent evaporation will exhibit odour levels which diminish with increased storage time. I
43、n these cases the pipe batches should be stored and released by the coater only when they exhibit an acceptable level of odour. Other seal coat materials (e.g. multi-component solvent-free epoxy coatings) which harden and cure by chemical reaction may not improve with increased storage time. Failure
44、 of the odour test of such materials probably results from a process abnormality which should be investigated. All pipes in the batch from which the test sample was taken should be considered suspect and quarantined pending investigation of the process records etc. NOTE 3This test is a production qu
45、ality control test to be undertaken by the manufacturer of the product as part of his Quality Assurance procedures. It is not a test of conformance with the requirements of statutory regulations. Attention is drawn to the fact that statutory regulations may apply when seal coat materials are used in
46、 contact with potable water. See the Foreword and Introduction of this standard. The manufacturer of the product shall define a procedure for the investigation and resolution of repeated failures of the odour test within a batch, taking into account the nature of the seal coat material and the proce
47、ss abnormalities which might cause repeated failure of the test. 6 Marking Each seal coated pipe or fitting shall be identified with the pipe manufacturers name or mark. In addition, seal coated pipes shall be indelibly and legibly marked on the external surface with the following: a) either the bat
48、ch number or code, or the date of manufacture (effectively date of seal coat application); b) the number and year of this standard1). NOTEWhere pipes are bundled, the markings required by a) and/or b) may be applied to the bundle rather than to individual pipes. Licensed Copy: London South Bank Univ
49、ersity, London South Bank University, Fri Dec 08 11:34:46 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7892:2000 4 BSI 04-2001 | | | | | | | | | | | Annex A (normative) Water quality (pH) A.1 Principle The effect of a seal coated cement lined surface upon the water quality (pH) of a given test water is determined by measuring the pH of test water after three successive 24 h periods of exposure within a seal coated pipe sample. A.2 Apparatus and materials A.2.1 DN 100 seal coated and cement lined pipe, with double spigot and at least 150 mm long. A.2.2