Used oil from tankers and drums is unloaded in used oil unloading pit fitted with course filtration screen to remove large suspended matter. The used oil is then pumped to either of the used oil storage tanks by used oil pit pump.

The used oil from either of these tanks is then pumped by dehydrator feed pump to dehydrator via fine duplex filter. The oil in the dehydrator is circulated by dehydrator circulation pump through dehydrator circulation heater which provides heat required for dehydration. Hot oil from the hot oil unit is circulated to dehydrator circulation heater for heating the circulating oil.

A part of the dehydrated oil from dehydrator circulation pump passes through dehydrated oil cooler where it gets cooled before going to dehydrated oil storage tank . The dehydrated oil from dehydrated storage tank is sent to total evaporation and fractional condensation section.

The water vapors along with some vaporized gas oil from dehydrator is condensed by dehydrator condenser. The condensate passes to oil separator . The separated gas oil is used as fuel in the hot oil unit and water is drained. This water can be reused as raw water.