Personnel Misting Unit (PMU)

During the manufacture of powdered pharmaceuticals, the ingredients, used, become airborne and may attached to the employee’s safety clothing; this is also true of any industry where airborne particulates present a significant threat so as to warrant safety clothing. Although the employee may be fully protected in disposable gowns mash etc or even a portable air supply, the transition from the work area to an outside environment requires, a fail-safe procedure to contain any particulate resident on the disposable clothing. Through experiments it has been shown that misting water with a hand held atomizer on the clothing, is superior to air lock blow-off systems typically used. Blowing at the clothing in an air lock system while dry, in a contained area, may or may not remove any particulate and may even redeposit any powdered materials or pathogens. With hand held water misting sprays, with or without a disinfectant, any particles will be contained on the protective clothing.

Decontamination and containment unit of hazardous materials and airborne particles.

PPDU Schematic

Problems with hand held misting
1 - The hand held mist sprayers produced a very wet mist and in order to cover the whole person takes it to long.
2 - Hand Misting may soak certain areas causing the water droplets to run together and drip on the floor.
3 - Personnel cannot be relied upon to completely mist everywhere on the protective suits

What this PMU provides is contained “Wet Atlantic fog or heavy dew” – water misted so fine that it remains airborne and becomes the environment, enveloping anybody standing within the enclosure. By standing with legs apart and arms raised away from their sides no area is left untouched.
To produce nozzle flows this low, requires an extremely small orifice, which is then coupled with compressed air, boosting the pressure and atomizing the water. Flow rates through any low flow nozzle will typically quickly become blocked with very small partials resident in tap water; the plant water is therefore filtered down to 5micron, a size not visible with the naked eye.

“What if” concerns and the ever-growing list of labour and safety requirements; such as, How will someone react given that they are clothed in an enviro-suit and locked in a Stainless Steel enclosure, with limited visibility, due to a dense, water laden fog. A significant PMU design feature enables the occupant to have override control while still following the operational sequence.

Override Controls = »»»»

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