ࡱ> SUR &bjbjΚΚ qH}Innnnn$Pl6$Lb b 4 #######,%4(#n #!nn #!!! n n #! #!!V"y#H$!a# #$06$m# (!(y#!ny# ##! 6$(  4:   * INTERPRETATION - "Department" means College/School/Department/Centre/Unit as relevant. 18.37.1 GENERAL The design of fume cupboards or any containment system is complex. Their prime objective is to ensure that toxic/harmful contaminants are extracted away from an operators breathing zone and that the air which personnel breathe is safe and without risk to health. This can only be done with full knowledge of the nature of the intended use/hazards of the materials to be handled the fume cupboards range of operations, its siting and other operational aspects, such as the type, amount, disposition and use of other equipment in the fumecupboard. These can have a significant effect on its exhaust air velocity and overall containment performance. 18.37.2 HAZARDS The hazards from the use of this equipment are associated with incorrect use, fan failure, filter blockage etc. which may lead to the escape of hazardous substances. The ultimate risk will depend upon the nature and amount of substances present, as well as the activities involved. 18.37.3 RISKS The risks associated with the aforementioned hazards are to be assessed by the Department (using the appropriate technical input where necessary). These assessments shall be carried out using: Check lists provided (where applicable) and Departmental Hazard Identification/Risk Assessment Work Sheets contained in Document No.3 i.e. Departmental Hazard Risk Assessment (D.H.R.A.). 18.37. 4 ARRANGEMENTS AND CONTROLS REQUIRED These hazards and risks will be minimised by the following arrangements and controls: All relevant personnel shall receive training in the safe use of the fume cupboard and good work practices, which must be strictly followed. Risk Assessments shall also be carried out of all hazardous operations intended to be undertaken in the fume cupboards Department fume cupboards shall be classified and given a Hazard Use Rating label in accordance with the following table. FUME CUPBOARD HAZARD RATING SCHEMEHAZARD RATING*Exposure Limit (ppm or g/m3)Minimum Face Velocity (m/sec.)Class 1 SlightOver 1000.4 - 0.6Class 2 Moderate5 1000.5 - 0.75Class 3 - HighUnder 50.7 - 1.0* Note: This rating may be revised with the issue of the new British Standard for Fume Cupboards. For many substances, exposure limits are not available and in such cases it shall be assumed that a fume cupboard of at least Class 2 or 3 shall be required. Most laboratory manipulations should however only require the use of Class 1-fume cupboards. For the above classification scheme to work, it is necessary to know the face velocity of a particular fume cupboard, in order that its classification can be assessed. (This can easily be measured with an anenometer, which every laboratory department should own as standard equipment). Once this has been done, a notice shall be affixed to the front and side of the fume cupboard, indicating its average face velocity at various sash heights, together with an indication of some of the substances which can be used therein to give a general indication to staff of its suitability for different categories of hazardous substances. For experimental purposes, each fume cupboard or unit shall be totally allocated to the control of one person/research team. [Cross mixing of chemicals may lead to explosions in exhaust ducts]. A fume cupboard may only be used for work in or below the category for which it has been approved. 18.37. 4 ARRANGEMENTS AND CONTROLS REQUIRED (Cont.) It shall be possible to close the sash quickly without any risk of disturbing the apparatus within the fume cupboard. The sash opening shall not be set above that at which the face velocity has been measured. Air flow meters and fan failure warning devices shall be incorporated into each fume cupboard. The sash shall be kept closed at all times except during set up procedures. Appropriate hazard warnings shall be displayed within the lab, when hazardous operations are in use The rate of release of toxic or flammable vapours shall be minimised by experimental design or by the use of smaller amounts of reagents All fume cupboards shall conform to latest BS-EN specification and be maintained to the same standard. Face velocities at the fume cupboard entrance, at maximum opening, shall be tested regularly, recorded and should be no less than 0.5m/sec averaged out over the opening. (Ensure that the supply of air to the room is also in excess of the total exhaust of all hoods plus the general room exhaust). A preventative maintenance programme shall be instigated by the Department/the Buildings & Estates Office, that adequately covers: fan face velocity testing, containment testing, electrical supply, motor and filter conditions (where appropriate). Replacements/repair shall be made promptly. Microbiological work shall not be carried out in fume cupboards. No explosive or potentially explosive materials shall be used in fume cupboards unless specifically designed or modified for this purpose. Impact grade screens and other safety protective devices shall be in place where there is any doubt. No work shall be carried out in a fume cupboard that is used or rated as a ventilated storage cabinet (i.e. airflow <0.4mls) or has unnecessary equipment stored within. The technician or researcher involved shall ensure that the fume cupboard is suitable for the chemicals used e.g. volatile oxidants, Perchloric acid or perchlorates. Hoods designated for these chemicals shall be clearly marked. Fume cupboards shall never be used as ventilated storage areas for chemicals. The proper functioning of fume hoods depends on a free flow of air through the unit and bottles, boxes, and equipment prevent this from occurring. (If chemicals must be stored, install ventilated shelves beneath the fume cupboard). Do not block the area at the back or the front airfoil with bench liner material or other objects Apparatus located with the fume cupboard shall be raised to allow free air passage under it via legs or using blocks. Examine any factors that may adversely reduce the efficiency of the cupboard e.g. location near door, passing traffic, incorrect sash position, storage of materials and equipment in cupboard, use of centrifuge, hot plate or heat sources etc. Establish good practices and encourage the reporting of any problems working with fume cupboards When work is completed ensure that a proper shutdown procedure is followed viz. let the fan run for a suitable period before switching off with the sash closed check that all services are shut off and reagents are returned to the proper storage area remove and clean all apparatus before returning to the store If energy conservation is necessary to areas where fume cupboards are working, it may be necessary to retrofit them with HOPEC (Hand Operated Positive Energy Control) sashes which ensures optimum hood efficiency 18.37.5 ARRANGEMENTS AND CONTROLS The details of the Arrangements and Controls in place and those required in the short, medium and long term, shall be set out by the Department in the forms provided in Document No.4 i.e. Departmental Safety Action Plan (D.S.A.P.). These Arrangements and Controls shall be reviewed and updated on a yearly basis. 18.37.6 RESPONSIBILITIES The following personnel are responsible in the Department/Lab/Area for ensuring the implementation and ongoing compliance with the aforementioned arrangements and controls. AREA/LOCATIONPERSON RESPONSIBLE1.2.3.4.5.6.   DEPARTMENT SAFETY STATEMENT DOCUMENT NO. 2: Requirements for the Control of Hazards and Risks SECTION 18.37.0 - Fume Cupboards Rev.2 PAGE   PAGE 1 of  NUMPAGES 3 AppSc\Doc2\Sect18.37 DOCUMENT NO. 2: Requirements for the Control of Hazards and Risks SECTION 18.37.0 - Fume Cupboards (Cont.) 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