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that soak up the mist, ranging from basic units to high-end Absolent systems which include self-draining filter cassettes (no drain facility means the user does not need to constantly change filters). In principle, the unit draws air inside, with heavier particles falling to the bottom before being pumped out for collection or re-use. Polluted air then travels up through the first filter cassette which traps smaller particles. It’s possible to include a further filtration process, including HEPA filters, in particularly demanding applications. And finally, electrostatic precipitation is another method used for removing oil mist particles. Electrostatic precipitators use an ioniser that produces an electrostatic charge which collects and traps air pollutants on an internal baffle plate. This type of filter is very effective for applications with fine particles. “Although we try to simplify mist extraction for our customers, these systems require correct specification,” says James Stansfield. “It’s not just a case of buying a product off-the-shelf and fitting it yourself. HSE guidance says such equipment requires fitting and commissioning by a competent LEV (local exhaust ventilation) installer. Machine shops need to get it right because we know for a fact that the HSE is
actively knocking on doors as we speak.” The HSE’s unannounced inspections look at how employers are ensuring the protection of workers from exposure to mist generated by CNC machines (see HSE guidance note HSG258 ‘Controlling airborne contaminants at work’). Any failures could lead to prosecution or liability to enforcement action. It could also expose the business to civil claims from employees or invalidate insurance claims. However, above all else, there is of course a moral obligation to protect employees. The fight goes on Despite stricter regulations than ever before, thousands of workers in the UK still contract occupational lung and other diseases, including cancer, each year. Some of these cases are attributable to exposure to dangerous levels of oil mist at work. “We can help put this worry to bed by assessing the risk and deciding what precautions are necessary to prevent or adequately control exposure to oil mist,” concludes James Stansfield. “If required, we can also monitor the situation and maintain the systems accordingly.” n
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15 Machinery & Manufacturing
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