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1、BRITISH STANDARD CONFIRMED OCTOBER 1987 BS 767:1983 Incorporating Amendment No. 1 Specification for Centrifuges of the basket and bowl type for use in industrial and commercial applications UDC 621.928.3 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:29:37 G
2、MT+00:00 2006, Uncontrolled Copy, (c) BSI BS 767:1983 This British Standard, having been prepared under the direction of the Chemical and Petroleum Standards Committee, was published under the authority of the Board of BSI and comes into effect on 29 July 1983 BSI 11-1999 The following BSI reference
3、s relate to the work on this standard: Committee reference CPE/6 Draft for comment 79/79593 DC ISBN 0 580 12910 1 Cooperating organizations The Chemical and Petroleum Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: Associ
4、ation of Consulting Engineers British Chemical Engineering Contractors Association British Gas Corporation British Rubber Manufacturers Association British Steel Corporation Chemical Industries Association* Coke Oven Managers Association Department of Energy (Petroleum oil) Department of Industry De
5、partment of Trade (Marine Division) Energy Industries Council Engineering Equipment Users Association* Glass Manufacturers Federation Health and Safety Executive* Institution of Chemical Engineers* Institution of Gas Engineers Institution of Structural Engineers Oil Companies Materials Association P
6、rocess Plant Association* The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: Associated Offices Technical Committee Coal Preparation Plant Association
7、Fabric Care Research Association Amendments issued since publication Amd. No.Date of issueComments 4652September 1984 Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:29:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 767
8、:1983 BSI 11-1999i Contents Page Cooperating organizationsInside front cover Forewordiii 1Scope1 2Definitions1 3Materials of construction3 4Methods of construction4 5Strength of baskets or bowls4 6Design requirements5 7Guards, interlocks and safe working6 8Noise level7 9Processing flammable material
9、s7 10Processing toxic materials8 11Inspection and testing8 12Information to be supplied8 13Data sheet9 14Marking9 Appendix A Illustrations of some basic types of centrifuge10 Appendix B Protective lining materials and surface covering24 Appendix C Methods of stress analysis for cylindrical baskets o
10、r bowls24 Appendix D Flammable materials27 Appendix E Recommendations for periodic examination and testing27 Appendix F Information28 Figure 1 Textile centrifuge11 Figure 2 Three point suspension, manual discharge, batch centrifuge, filtration machine12 Figure 3 Pendulum, automatic discharge, batch
11、centrifuge, filtration machine13 Figure 4 Horizontal spindle, automatic discharge, batch centrifuge, filtration machine14 Figure 5 Three point suspension, automatic discharge, batch centrifuge, filtration machine15 Figure 6 Basket centrifuge with extraction screw conveyor, continuous centrifuge, fil
12、tration machine16 Figure 7 Pusher, continuous centrifuge, filtration machine16 Figure 8 Self discharge conical, continuous centrifuge, filtration machine17 Figure 9 Three point suspension, batch centrifuge, sedimentation machine17 Figure 10 Tubular bowl, batch centrifuge, sedimentation machine18 Fig
13、ure 11 Chamber bowl, batch centrifuge, sedimentation machine19 Figure 12 Disc bowl, batch centrifuge, sedimentation machine20 Figure 13 Nozzle discharge disc continuous centrifuge, sedimentation machine21 Figure 14 Opening bowl continuous centrifuge, sedimentation machine22 Figure 15 Solid bowl deca
14、nter23 Figure 16 Combined sedimentation and filtration machine, screen bowl decanter23 Figure 17 Typical basket25 Figure 18 Pattern of perforations26 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:29:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 767:1983
15、ii BSI 11-1999 Page Table 1 List of figures illustrating basic types of centrifuge10 Publications referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:29:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 767:1983 BSI 11-1999iii Foreword
16、 The British Standard has been prepared under the direction of the Chemical and Petroleum Standards Committee. This standard for hydro-extractors which was originally issued in 1938, revised and modified in 1951, has been re-written and this edition supersedes BS 767:1951 which is withdrawn. The tit
17、le has been altered and the scope has been extended to include all machines using centrifugal action to separate two or more substances, excepting only those laboratory machines which are covered by BS 4402 and high speed gas centrifuges used for the enrichment of fissile material. Centrifuges used
18、in the processing of nuclear fuel should in general conform to this standard. There may be other specific requirements relating to the irradiation effect upon non-metals and lubricants, criticality and remote control. The method of calculating stresses is based on that produced by the European Commi
19、ttee of Chemical Plant Manufacturers (EUCHEMAP 1 November 1974). The UK Health and Safety at Work etc. Act 1974 places a responsibility on manufacturers, suppliers and users of machinery, to ensure that, as far as is reasonably practicable, equipment is safe when used properly for the purpose for wh
20、ich it is designed. Information has therefore been included to give guidance on the best known practice at the time of preparing this revision, in particular safe access for product removal, cleaning, and maintenance of these machines. The UK Institution of Chemical Engineers “User guide for the saf
21、e operation of centrifuges”, was used as a basis for many of the recommendations. The aim of this standard is to specify the materials and methods of manufacture, operating procedures and accessories required for the safe operation of centrifuges and also to ensure sufficient information is made ava
22、ilable from the manufacturer and user to enable an inspection authority to determine the degree of safety and hence the suitability of the equipment for the duty. Materials of construction listed are those in current general use. The allowable stresses have been brought in to line with current pract
23、ice. The importance of noise, i.e. unwanted sound, has increased since 1951 and attention is drawn to the “Code of practice for reducing the exposure of employed persons to noise”1), which gives guidance on permissible levels and measurement techniques. Figure 2 to Figure 6, Figure 8 and Figure 9 ar
24、e reproduced from French standard NF E 40-010 August 1976, by kind permission of the Association Franaise de Normalisation (AFNOR). 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. Com
25、pliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 30, an inside back cover and a back cover. This standard has been updated (see copyright date) and may h
26、ave had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) Published by HMSO (ISBN 011 8803409). Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:29:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licens
27、ed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:29:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 767:1983 BSI 11-19991 1 Scope This British Standard specifies design, materials, methods of construction, inspection and testing of centrifuges of the basket and bow
28、l and vibrating types for use in industrial and commercial application. To assist manufacturers and users to fulfil their obligations under the Health and Safety at Work etc. Act 1974, information is included covering safe access and safe working. Additional provisions necessary for handling highly
29、flammable and/or toxic substances are also included. Tube and bottle type centrifuges as used in laboratories are covered in BS 4402 and are excluded from this standard. High speed gas centrifuges used for the enrichment of fissile material are also excluded. The handling of explosive or biologicall
30、y hazardous materials and also the use of non-metallic material for stressed parts of rotating assemblies is outside the scope of this standard. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this British Standar
31、d the following definitions apply. 2.1 centrifuge a machine in which extraction or separation of a liquid from a solid and/or separation of immiscible fluids is achieved by centrifugal action NOTEIllustrations of some basic types of centrifuges are given in Appendix A. 2.2 batch centrifuge a machine
32、 that processes a discrete batch of feed material. It may be automated to go through a sequence of feeding, washing and spinning. Solids discharge may be either automatic, the solids being removed either at full speed or at a low speed, or the machine may be stopped for manual removal of the materia
33、l, solid waste or product 2.3 continuous centrifuge a machine that takes a continuous feed of material, giving a continuous discharge of liquor. Solids are removed either continuously or intermittently 2.4 pusher centrifuge a continuous filtering machine with an oscillating mechanism for discharge o
34、f solids 2.5 decanter centrifuge a continuous sedimentation machine with an internal screw mechanism for removal of settled solids from a rotating bowl 2.6 disc bowl centrifuge a continuously fed sedimentation machine provided with a number of equally spaced conical discs between which the feed pass
35、es solids are removed from the bowl either manually, or as a slurry via nozzles or by a bowl opening mechanism 2.7 textile centrifuge a machine used in dry cleaning, laundering and textile processes to extract liquid from textile materials or articles 2.8 basket that part of a centrifuge, arranged t
36、o rotate about its axis, having a perforate shell in which the liquid is separated from the solid component 2.9 bowl that part of a centrifuge arranged to rotate about its axis, having an imperforate shell for the separation of immiscible liquids and/or the sedimentation of solids 2.10 spindle the s
37、haft or shafts on which the basket or bowl is carried 2.11 rotor the part of the centrifuge that rotates, comprising basket or bowl and spindle together with attachments 2.12 casing the stationary casing surrounding the basket, or bowl, adapted to receive the separated products and having means for
38、their discharge 2.13 plough a device for the removal of centrifuged solids from the rotating basket or bowl Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:29:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 767:1983 2 BSI 11-1999 2.14 screw conveyor a helica
39、l screw device mounted either within the bowl or basket and rotating concentrically with it or statically mounted as part of the casing so as to feed or discharge solids 2.15 hoops rings secured to the outer periphery of a centrifuge basket to give extra strength 2.16 bumping ring a device to limit
40、radial movement of the rotor. The bowl or shaft will normally run freely within the bumping ring 2.17 screen a medium, usually metallic, used as an alternative to a cloth within the rotating assembly for the purpose of solids retention or as a support for a filter cloth 2.18 cover or closure for bas
41、kets a detachable cover fitted in a centrifuge basket that holds the contents in position during rotation and is used to facilitate manual loading of the basket or lifting out of a filter bag 2.19 inspection cover or port an integral part of the centrifuge casing that is bolted, clamped or otherwise
42、 secured before the rotor is set in motion. It may be removed or opened for maintenance, inspection, lubrication or cleaning purposes. 2.20 cover (or lid) a plate or door forming part of the casing that, when closed or secured, prevents persons from coming into contact with moving parts, from becomi
43、ng entangled with any material in motion within and from being splashed or affected by fumes from the machine 2.21 interlock a device using mechanical, electrical, pneumatic or hydraulic components, or any combination of these, that prevents an action or motion taking place until some specified safe
44、 or predetermined condition has been established. In addition it will normally continue to prevent an unsafe situation occurring 2.22 classification of hazardous areas an international system that recognizes three orders of probability of fire or explosion associated with the possible presence of fl
45、ammable gases or vapours in a geographical area, namely Zone 0, Zone 1, and Zone 2 in decreasing order of severity (See BS 5345.) 2.23 combustion consumption by oxidation, with the production of heat, usually with incandescence or flame or both 2.24 flammable capable of burning in air with a flame 2
46、.25 highly flammable any substance that, when tested in a manner specified in the Highly Flammable Regulations 1972, gives off a flammable vapour at a temperature of less than 32 C and when tested in the specified way for combustibility, supports combustion 2.26 flash point the lowest temperature at
47、 which a liquid gives off sufficient flammable vapour in air to produce a flash on the application of a small flame 2.27 inert gas a gas that cannot support combustion (For practical purposes, usually nitrogen, but argon, flue gas or carbon dioxide are occasionally used when suitable and available.)
48、 2.28 inert gas blanket a system where the oxygen content within an enclosure is reduced by the use of an inert gas to a concentration at which an explosive atmosphere cannot form 2.29 operating speed of a centrifuge the speed measured in revolution per unit time at which the rotor is expected to re
49、volve either continuously or at each part of a multi-speed programme 2.30 permissible speed of a centrifuge the maximum allowable speed of the rotor determined from stress considerations allowing the appropriate factor of safety Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 13:29:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 767:1983 BSI 11-19993 2.31 frame the major stationary part that supports the rotor. The centrifuge casing is normally mounted on the frame 2.32 highly stressed parts those
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