1、BRITISH STANDARD BS 7989:2001 Specification for recirculatory filtration fume cupboards ICS 13.040.30; 91.140.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS 7989:2001 This British Standard, having been prepared under the direction of the Sector Committee for Materials an
2、d Chemicals, was published under the direction of the Standards Committee and comes into effect on 15 July 2001 BSI 07-2001 The following BSI references relate to the work on this British Standard: Committee reference LBI/18 Draft for comment 00/120749 DC ISBN 0 580 33277 2 Committees responsible fo
3、r this British Standard The preparation of this British Standard was entrusted to Technical Committee LBI/18, Laboratory furniture and fittings, upon which the following bodies were represented: Association for Science Education BLWA Ltd. The Association of the Laboratory Supply Industry British Edu
4、cational Suppliers Association British Furniture Manufacturers Federation British Occupational Hygiene Society Chartered Society of Designers Chemical Industries Association CLEAPSS School Science Service Department for Education and Employment Furniture Industry Research Association Health and Safe
5、ty Executive Institution of Mechanical Engineers Manufacturing Science Finance Medical Research Council Research and Development Facilities Consortium Royal Institute of British Architects Royal Society of Chemistry United Kingdom Fume Cupboard Association Universities Safety Association Amendments
6、issued since publication Amd. No. Date CommentsBS 7989:2001 BSI 07-2001 i Contents Page Committees responsible Inside front cover Foreword ii Introduction 1 1S c o p e 1 2 Normative references 1 3T e r m s a n d d e f i n i t i o n s 2 4S a f e t y 4 5 Materials of construction 6 6S e r v i c e s 6
7、7 Filtration systems 6 8 Type test procedures 7 9 Efficiency testing for installed gaseous phase filter 8 10 Marking 8 11 Commissioning 9 12 Information to be supplied with the fume cupboard 9 Annex A (informative) Gaseous phase filter tests for efficiency 10 Annex B (informative) Monitoring and mai
8、ntenance recommendations to the user 17 Annex C (normative) Gaseous phase filter test for capacity using propan-2-ol 18 Annex D (normative) Commissioning 19 Bibliography Inside back cover Figure A.1 Apparatus for measuring sulfur dioxide release rate 12BS 7989:2001 ii BSI 07-2001 Foreword This Briti
9、sh Standard has been prepared under the direction of the Sector Committee for Materials and Chemicals (I/-) by Technical Committee LBI/18, Laboratory furniture and fittings. It has been prepared in response to calls from industry for a standard for fume cupboards of the filtration type, which are no
10、t covered by BS 7258. It was intended originally that this work should be undertaken as part of the European (CEN) programme of work on fume cupboard standards, but this proved unfeasible in the short term. The structure of BS 7258 has been used to some extent in this British Standard and, where pos
11、sible, identical requirements have been specified. However, this British Standard should be considered as essentially separate and distinct from BS 7258. Attention is also drawn to Building Bulletin 88 1, issued by the Department for Education and Employment in 1998. Whenever a fume cupboard is used
12、, it is necessary for the purchaser and/or user to assess the hazards associated with the materials to be manipulated, to ensure that the fume cupboard is satisfactory for its intended purpose and that current exposure limits for toxic substances are not exceeded. Annex A and Annex B are informative
13、. Annex C and Annex D are normative. This British Standard calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health at any s
14、tage. 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 immunity from legal obligations. Summary of pages This document comp
15、rises a front cover, an inside front cover, pages i and ii, pages 1 to 20, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.BS 7989:2001 BSI 07-2001 1 Introduction The purpose of a recirculatory filtration fume cup
16、board is to contain a pollutant or pollutants released from a source or sources within the fume cupboard and, by a filtering device, to reduce substantially the concentration of specified pollutants prior to recirculating the air back to the room. These devices should only be used with pollutants of
17、 documented hazard, which permits the selection of appropriate filter(s). NOTE Several of the tests described in this British Standard require the use of hazardous substances. Appropriate risk assessment should be made and suitable precautions taken at all times. 1 Scope This British Standard specif
18、ies requirements for fume cupboards designed to recirculate air back to the room after filtering out specified pollutants. This British Standard does not specify requirements for fume cupboards of the type dealt with in BS 7258. This British Standard is not applicable to recirculatory filtration fum
19、e cupboards of the following types: recirculatory filtration fume cupboards for work on radioactive materials; recirculatory filtration fume cupboards for work on microbiological agents; high thermal load recirculatory filtration fume cupboards; recirculatory filtration fume cupboards employing wet
20、scrubbing systems. This British Standard is not intended to apply to small enclosures intended only for applications such as weighing, in which the filter retention capacity is likely to be small. 2 Normative references This British Standard incorporates, by dated reference, provisions from other pu
21、blications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. Subsequent amendments to, or revision of, any of these publications apply to this part only when incorporated in it by amendment or revision. BS 7258-1:1994, Laboratory f
22、ume cupboards Part 1: Specification for safety and performance. BS 7258-2:1994, Laboratory fume cupboards Part 2: Recommendations for the exchange of information and recommendations for installation. BS 7258-3:1994, Laboratory fume cupboards Part 3: Recommendations for selection, use and maintenance
23、. BS 7258-4:1994, Laboratory fume cupboards Part 4: Method for determination of the containment value of a laboratory fume cupboard. BS 7501:1989, General criteria for the operation of testing laboratories. BS EN 292-1:1991, Safety of machinery Basic concepts, general principles for design Part 1: B
24、asic terminology, methodology. BS EN 292-2: 1991, Safety of machinery Basic concepts, general principles of design Part 2: Technical principles and specifications. BS EN 1822-1:1998, High efficiency air filters (HEPA and ULPA) Part 1: Classification, performance testing, marking. BS EN 12469:2000, B
25、iotechnology Performance criteria for microbiological safety cabinets. BS EN 60529:1992, Specification for degrees of protection provided by enclosures (IP code). BS EN 60651:1994, Specification for sound level meters. BS EN 60804:1994, Specification for integrating-averaging sound level meters. BS
26、EN 61010-1:2001, Safety requirements for electrical equipment for measurement, control, and laboratory use Part 1: General requirements.BS 7989:2001 2 BSI 07-2001 3 Terms and definitions For the purposes of this British Standard, the following terms and definitions apply. NOTE Some of the definition
27、s are identical with definitions given in BS 7258-1:1994. 3.1 air pollutant gases, vapours, aerosols, fumes or particulate materials in air, constituting one or more of the following hazards: a) toxicity (all injuries to health including asphyxiation, allergy, narcosis); b) flammability (including r
28、isks of explosion); c) chemical activity (including corrosion); d) discomfort, e.g. lachrymosis, objectionable odours. NOTE In the field of environmental pollution, fume is defined as an aerosol of solid particles, usually from metallurgical processes, generated by condensation from the gaseous stat
29、e generally after volatilization from melted substances and often accompanied by chemical reactions such as oxidation. 3.2 area of opening product of the average width of the opening (3.20) and the height of the opening (3.8) 3.3 baffle plate installed to minimize the variation of face velocity (3.4
30、) over the sash opening plane (3.17) and encourage scavenging throughout the fume cupboard 3.4 face velocity velocity of air passing through the sash opening plane (3.17) 3.5 filter breakthrough alarm substance-specific alarm designed to indicate when an unacceptable concentration of a specific poll
31、utant is emerging from the filter 3.6 filter efficiency gaseous phase filtration efficiency of a recirculatory filtration fume cupboard, defined as: where C ois the concentration of a given pollutant in the fume cupboard and C eis the concentration of that pollutant in the recirculated air (3.13) 3.
32、7 gaseous phase filter filter capable of adsorbing pollutant gases and vapours NOTE The filter commonly contains activated carbon. Chemicals may be impregnated into the filter media to improve efficiency and filter life. 3.8 height of the opening distance, measured in the plane of the sash (3.16), b
33、etween the upper edge of the work surface (3.21) (or raised anti-spill lip where fitted) and the lower edge of the sash, sash airfoil or sash finger pull sections where fitted 100 C o C e C o - -BS 7989:2001 BSI 07-2001 3 3.9 high efficiency particulate air filter HEPA filter filter used to remove p
34、articles to submicron levels NOTE Examples are classes H 13 and H 14, as specified in BS EN 1822-1:1998. 3.10 normal sash opening maximum height (in the case of vertically adjustable sashes) or width (in the case of horizontally adjustable sashes) to which the sash should be opened during use of the
35、 fume cupboard and at which point a stop or other device is fitted to prevent the opening being exceeded under normal use 3.11 occupational exposure limit OEL time weighted average concentration limit (TWL) of a hazardous substance in air, which may be either an occupational exposure standard (OES)
36、or a maximum exposure limit (MEL) NOTE 1 Two time periods are used: long term (8 hours) and short term (15 minutes). NOTE 2 An OES is a TWL set at a level at which (based upon current scientific knowledge) there is no indication of risk to the health of workers exposed to it by inhalation day after
37、day. NOTE 3 An MEL is the maximum concentration of an airborne substance, averaged over a reference period, to which employees may be exposed by inhalation under any circumstances. 3.12 pre-filter filter used to remove particulates and protect HEPA (3.9) and/or gaseous phase filter(s) (3.6) 3.13 rec
38、irculated air air that is passed back into a room after passing through the fume cupboard filter system 3.14 recirculatory filtration fume cupboard fume cupboard that is fitted with an integral filtration system capable of reducing specified air pollutants (3.1) before the air is recirculated back i
39、nto the room 3.15 retention capacity mass of specified pollutant adsorbed by the gaseous phase filter (3.7) of a recirculatory filtration fume cupboard (3.14), under defined conditions, before the concentration in the filtered air reaches the OEL (3.11) of the pollutant 3.16 sash transparent screen
40、between the operator and the working space that can be adjusted by either vertically or horizontally moving panels or hinged panels 3.17 sash opening plane plane of the sash (3.16) or, when the plane of the sash does not meet the work surface (3.21), non-vertical plane bounded at the top by the lowe
41、st point of the upper edge of the opening in the plane of the sash, at the bottom by the uppermost point of the lower edge of the opening and at the sides by the side edges of the opening NOTE If the sash is formed by more than one transparent panel, then the plane used is that through the centre of
42、 the outermost section.BS 7989:2001 4 BSI 07-2001 3.18 services supplies of illumination, electricity, water, vacuum, compressed air, gas or other special fluids 3.19 volume flow rate volume of air per unit time passed through the fume cupboard and filters 3.20 width of the opening average distance
43、measured between the two sides of the clear opening of the fume cupboard in the case of vertically adjustable sashes (including hinged panels), or the average distance between the vertical edges of the opening (between two sliding sash panels for centrally positioned openings or between one sliding
44、panel and the inner edge of the outer vertical side of the opening) in the case of horizontally adjustable sashes NOTE The gap between the end sash panels and the sash frame or edges of the side wall is not included in this dimension. 3.21 work surface surface of the slab or platform above the spill
45、age tray which acts as the base of the fume cupboard interior or, if no spillage tray is fitted, the upper surface of the base of the fume cupboard interior 4 Safety 4.1 General Recirculatory filtration fume cupboards shall be designed to protect users and the working environment. This shall be achi
46、eved by: a) minimizing the escape of hazardous concentrations or quantities of fumes from the fume-cupboard, either through the frontal sash opening or through the filters into the room; b) efficiently purging the enclosure to reduce the potential for an explosive or hazardous atmosphere to develop
47、within the enclosure; c) providing some protection to the user against splashing of hazardous substances and minor explosions. NOTE Attention is drawn to HSE Guidance Note EH40 2 and Statutory Instrument 1999 No. 437 (The Control of Substances Hazardous to Health Regulations) 3. 4.2 Electrical 4.2.1
48、 Electrical aspects of the construction of the fume cupboard shall be in accordance with BS EN 61010-1:2001. 4.2.2 Electric motors incorporated in the construction of the fume cupboard shall be non-sparking and of minimum enclosure ingress protection factor IP-44, as defined in BS EN 60529:1992. Oth
49、er electrical components shall be isolated from the airstream. 4.3 Mechanical Aspects of the construction of the fume cupboard relating to mechanical safety shall be in accordance with BS EN 292-1:1991 and -2:1991. NOTE Attention is drawn to relevant regulations, such as the Safety of Machinery Directive 98/37/EC, as amended by 98/79/EC 4. 4.4 Specific 4.4.1 Control of air entry The air entry profile of the front opening shall be designed such that the fume cupboard complies with clause 8. NO
