BS-7677-1993 ISO-9691-1992.pdf
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1、BRITISH STANDARD BS 7677:1993 ISO 9691:1992 Recommendations for Classification of imperfections in pipe joint rings UDC 621.643.44 036.4 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:29:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7677:1993 This British
2、 Standard, having been prepared under the direction of the Plastics and Rubber Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 July 1993 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference
3、PRM/70 Draft for comment 91/40185 DC ISBN 0 580 22434 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/70, upon which the following bodies were represente
4、d: British Gas plc British Plastics Federation British Precast Concrete Federation Ltd. British Rubber Manufacturers Association Ltd. Clay Pipe Development Association Ltd. Concrete Pipe Association Ductile Iron Producers Association Fibre Cement Manufacturers Association Ltd. Institution of Water a
5、nd Environmental Management Malaysian Rubber Producers Research Association RAPRA Technology Ltd. Society of British Water Industries Water Companies Association Water Research Centre Water Services Association of England and Wales Amendments issued since publication Amd. No.DateComments Licensed Co
6、py: London South Bank University, London South Bank University, Fri Dec 08 11:29:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7677:1993 BSI 07-1999i Contents Page Committees responsibleInside front cover National forewordii Introduction1 1Scope1 2Normative references1 3Classification of imperfec
7、tions1 4Maximum acceptable limits for imperfections2 Annex A (informative) Bibliography12 Figure 1 Flash3 Figure 2 Off-register4 Figure 3 Mismatch5 Figure 4 Backrind and parting-line indentation6 Figure 5 Excessive trimming7 Figure 6 Flow marks8 Figure 7 Surface depression9 Table 1 Classification of
8、 surface imperfections in zones not involved in the sealing function10 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:29:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7677:1993 ii BSI 07-1999 National foreword This Brit
9、ish Standard has been prepared under the direction of the Plastics and Rubber Standards Policy Committee. It is identical with ISO 9691:1992 Rubber Recommendations for the workmanship of pipe joint rings Description and classification of imperfections published by the International Organization for
10、Standardization (ISO). The Technical Committee has reviewed the provisions of ISO 2781:1988, to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A British Standard does not purport to include all the necessary provisio
11、ns of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-reference International standardCorresponding British Standard ISO 7743:1989BS 903 Method for physical testi
12、ng of rubber Part A4:1990 Determination of compression stress-strain properties (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 12, an inside back cover and a back cover. This standard has been updated (see copyright date) and may
13、 have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:29:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7677:1993 BSI 07-19991 Introduction International S
14、tandards such as ISO 46331, ISO 64472 and ISO 64483 (see bibliography) for rubber joint rings for pipelines include some general requirements for the finished rings, particularly for workmanship, in statements such as: “The rings shall be free from porosity and shall not have surface defects or irre
15、gularities which could affect their functions”. In order to assist manufacturers wishing to comply with such requirements, this International Standard describes manufacturing imperfections which could arise during the production of pipe joint rings, and lists criteria by which the quality of workman
16、ship can be assessed. It should be stressed, however, that this International Standard is not a specification. Whether an imperfection is to be considered as a defect will ultimately have to be agreed upon between the interested parties (see clause 4). 1 Scope This International Standard describes a
17、nd classifies imperfections in rubber joint rings for pipelines. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards
18、 are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 2781
19、:1988, Rubber, vulcanized Determination of density. ISO 7743:1989, Rubber, vulcanized or thermoplastic Determination of compression stress-strain properties. 3 Classification of imperfections 3.1 Surface imperfections There are three types of surface imperfection: a) imperfections not involving exce
20、ss or shortage of material (see 3.1.1); b) excess material (see 3.1.2); c) shortage of material (see 3.1.3). NOTE 1Some surface imperfections, e.g. offset and shortage of material, can appear in combination. 3.1.1 Imperfections not involving excess or shortage of material 3.1.1.1 Bloom: A liquid or
21、solid material which has migrated to the surface of a rubber. 3.1.1.2 Surface inclusion (foreign material): Any extraneous matter embedded in the surface. 3.1.1.3 Cut: A fine incision similar to that made by a scalpel. The cut is not open. It is usually necessary to stretch the rubber for the edges
22、of the cut to become clearly visible. 3.1.1.4 Cracking: A network of fine cracks or crazing which is not visible unless the rubber is folded. It may be caused, for example, by ageing or incorrect storage. 3.1.2 Excess material 3.1.2.1 Flash (see Figure 1): Excess material which escapes from the moul
23、ding cavity during moulding of a moulded ring, or is produced at the weld line of an extruded welded ring, and solidifies to form a film-like appendage. It is caused by mould separation and is present owing to inadequate trimming. 3.1.2.2 Offset: Joint ring halves that are off-register or mismatched
24、. 3.1.2.2.1 Off-register (see Figure 2): Misalignment of joint ring halves caused by lateral shift of one mould cavity plate or one end of the extrusion relative to the other. 3.1.2.2.2 Mismatch (see Figure 3): Abrupt change in cross-section of a joint ring, caused when the cross-sectional dimension
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