This method is used to empty the used solvent from the cleaning bath. The bath is lled with new solvent from another 200-litre, stainless steel system drum which is also tted with an explosion-proof drum pump and ller gun. Inspection plugs on the bottom of both drums are used to check and remove any deposits present. The vacuum is a standard DS 1220 EX unit made from conductive glass bre-reinforced plastic and driven by a 2.5 kW, Ex-rated AC motor. A bag lter ensures that dirt cannot make its way into the blower or into the exhaust air. The exhaust air is fed back through a 4-metre long hose into the spray booth where it is treated by the booth extraction system. This ensures that no solvents or volatile hydrocarbons are released into the atmosphere. The combined lling-extraction

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