Industrial and Local Exhaust Ventilation LEV
An LEV is an engineering control system to reduce exposures to airborne contaminants such as dust, mist, fume, vapour or gas in the workplace.
Generally a system will have some or all of the following components:
Capture Hood / plenum, booth etc., Ducting, Air cleaner, filter and/or abatement plant, air mover (usually fan) and discharge point. Monitoring of the air flow, filtration abatement plant and emissions may be required, together with an air supply system.
All parts of the LEV system must be effective and correctly designed ensuring compliance to COSHH, CE directives, PUWER, DSEAR, and environmental regulations. Please see the relevant pages in this web site for specific details of all the applicable components, parts, legislation etc.
Legislation and Environmental Considerations, and how this could affect your business
With the introduction of COSHH, the Environmental Protection Act (EPA) and Integrated Pollution Prevention and Control regulations, more consideration is being given to the rigorous control of workplace air quality and emission levels for a wide range of chemicals, substances and products. Emissions and air quality limits, for Substances Hazardous to Health are generally getting more stringent with lower applicable limits.
COSHH regulations 2002 (as amended), requires that, no work that exposes anyone to substances hazardous to health, shall be carried out until an assessment has been made and appropriate control measures are implemented / employed.
What is a "control measure"?
This is anything which reduces exposure, whether it be; changing the process, methods of working or systems of work, providing engineering controls, permits to work, or anything else. In this section we will be dealing with Engineered Controls using Local Exhaust Ventilation.
“To be effective long-term, Engineered Control Measures must be practical, workable and sustainable” Para 297 COSHH 2002. For this reason it is crucial that the plant, processes, substances, pollutants, methods / systems of work, maintenance, local environmental regulations and any other relevant information is fully investigated and understood.
HSG258 - Controlling airborne contaminants at work
So how can we help you with your requirements?
We have over 25 years of experience in designing; installing, commissioning and maintaining dust and fume extraction systems. This extensive (application specific) experience and our creative engineering team, enables us to provide the right 1st time solution for your requirements. We often solve problem’s which others have left, and provide unique and innovative solution’s, at competitive prices.
R&B Industrial Ltd can survey your processes using appropriate qualitative and quantative techniques and monitoring of substances where required. We will study material safety data sheets and your specific requirements always applying good Workplace Control Principles and advising customers accordingly. In some instances, other control measures, with / without LEV, may be more appropriate, such as substance substitution, design changes in the process, enclosing processes more fully, or simple modifications/changes to existing hood design can often improve LEV performance considerably.
We have a vast range of experience in many different industries and processes. This enables us to design, manufacture, supply, install, test and maintain all aspects of Dust and Fume Extraction systems and equipment, for virtually all manufacturers, Industry applications and processes, including full compliance to all of the relevant directives and regulations. We also offer full ATEX / DSEAR risk assessments and hazardous area zoning for complete plant and processes.
Often our effective ‘capture at source’ designs enable us to provide more cost effective and efficient complete LEV systems. Cutting initial capital costs compared to the competition and providing longer term energy and filtration/consumable cost savings.
We have the capability to provide turnkey projects, from Consultancy and Feasibility studies, to Design, Manufacture, Build, Installation and Commissioning, supported by a dependable after sales service. Our Project/design Engineers are qualified to BOHS, P602 (Basic Design Principles of Local Exhaust Ventilation (LEV) Systems)
We always use our own experienced installation engineers (or our own approved contractors), specialising in industrial ventilation. In this way we ensure that each installation runs smoothly, meeting the design criteria, maximising the systems benefits and minimising the risk of costly mistakes.
To provide the most cost effective systems, the overall system lifecycle and energy costs must be taken into account at the design stage. We source energy efficient fans and filters with lower operating differential pressures, where possible, providing costs savings over the longer term. Many of our systems now include inverters with feedback controls to ensure that we maximise energy savings. This can compensate for many process changes such as: differential filter pressures, branches being closed / open, booster / cyclone fans operating intermittently etc. By tailoring the control system to the specific application we always ensure the system is working optimally, maximising energy savings. Our in-house control engineers are able to tune and optimise the system controls providing maximum benefit.
For general / dilution ventilation systems, further optimization can be made using room occupancy sensors to automatically switch ventilation on / off as required; ventilation is controlled by Variable Air Volume (VAV) and Constant Volume Dampers (CVD); see general industrial Ventilation air handling units and associated systems.doc
We can carry out comprehensive pre-design DSEAR / ATEX assessments. This ensures that:
- Hazardous Areas are correctly zoned: 22, 21, 20 dusts. 2, 1, 0 vapours, mists, gases
- Air flows are correctly specified for assurance of correct zoning
- Correct equipment category is specified
- Correct control measures are put in place such as air flow monitoring and alarms.
Following this the correct LEV hood design is crucial to ensure air flows and flammable dust / solvent etc capture is effective. This enables us to potentially reduce extents of zones saving our customers potentially many thousands of pounds.
We carry out project and ventilation works in the following areas: Hampshire Berkshire Avonmouth Dorset Devon Wiltshire Somerset Oxfordshire Buckinghamshire Middlesex Northamptonshire Surrey Sussex Wales Bedfordshire Gwent Cambridgeshire Cardiff Carmarthenshire Ceredigion Clackmannanshire Derbyshire Essex Gloucestershire Greater London Gwynedd, Hertfordshire, Isle of Wight Nottinghamshire Kent Leicestershire