Oily Water seperators - OWS

Gravitational

The most common type of oily water seperators found on ships are of the gravitational type. these rely on the difference in SG of the mix to seperate out the oil from the water 

Shown above is a gravitational type seperator capable of very good quality effluent discharge. A safety valve (not shown) is mounted on the unit as are test cocks and a drain valve.

Operation

The unit is initially filled with purge water. The discharge from the pump has a sample line take of to a 15ppm monitor. This is lined up and in used with flushing water used until the pump is running. The unit activation button is pressed, the oil outlet valve is closed, the suction valve is opened and the discharge pump is started. Bilge water is drawn through the unit over a vertical arranged plate stack. The 15pp monitor is lined up to the pump discharge sample line