Background to Occupational monitoring;

The Health and Safety Executive have pre described occupational exposure limits on a number of substances hazardous to health. Legislation requires that exposure to such substances is either prevented or adequately controlled. This may be in the form of protective masks and clothing, Local Exhaust Ventilation systems (LEVs), limited amounts of time in a hazardous area and other methods. Under the Control of Substances Hazardous to Health, every company has to provide protective equipment, training and safety protocols (as well as keep them up-to-date and in an efficient state and working order).

The occupational monitoring team at EnviroDat can provide a thorough service that will give peace of mind to employers concerned with the health and safety of their employees.

Our occupational surveys include the monitoring of individuals for things such as respirable and inhalable dusts, solvent vapours and welding fumes and the testing of LEV systems.

Respirable & Total Inhalable Dust Monitoring;

A respirable dust refers to an ambient dust particle that is up to 7 microns in size. This size of dust can cause an array of problems in the human lungs if exposure is high for a certain periods of time. The current exposure limit for respirable dust is 4 mg per meter cubed. Industries where this is a more common problem are in the quarry and construction industry where rock crushing etc can cause high dust production.

The normal monitoring procedure at EnviroDat would be to use a personal sampling pump which can be attached to a worker while undergoing normal duties. The sampling pump brings in air through a pre-weighed filter, which is then conditioned and re-weighed once sampling is complete. This results in a known dust quantity over a known time period. Chemical analysis of the dust can also be obtained from the filter.

Local Exhaust Ventilation Assessment;

An LEV system is designed to extract airborne hazardous particulates or fumes via a ventilation system from people in the workplace. In its normal working condition it should reduce the risk of a worker inhaling hazardous substances while working on operations that are likely to release these substances. The LEV normally consists of an inlet, hood, slot, booth or cabinet placed around or close to the point of release of the substance. The extracted air is usually discharged to the atmosphere or filtered and returned to the workplace.

Under COSHH regulations there is a requirement to perform testing of LEV systems at least once every 14 months. The health and safety executive also suggest the testing be performed by competent people who are not normally responsible for the system and maintenance.

EnviroDat primarily use hot wire or vane anemometers, pitot tubes and other monitoring equipment to monitor the flow velocity in and around the extraction point, static pressures and duct dimensions.