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RECTANGULAR 01 WATER SEPARATORS CO PCO FEATURES McTighe Industries rectangular oil-water separators are designed to separate free oils and grease from wastewater. Standard sizes range from 115 to 1440 gallons with maximum flowrates from 20 to 150 gpm. Larger engineered systems are available. These separators are designed for installations above grade or below grade in a vault. McTighe offers two main rectangular separator configurations: our standard model CO-and our Petro PakTm equipped model PCO. Both separators include highly efficient corrugated plates to coalesce floating oils and grease. The PCO models include our enhanced Petro PakTm coalescer to aid in removing small oil droplets that do not have enough buoyancy to be captured before reaching the discharge end of the separator. • The CO model separator has been designed and proven to produce 15 parts per million or less free oil in the effluent under normal operating conditions. • The PCO model separator has been designed and proven to produce 10 parts per million or less free oil in the effluent under normal operating conditions. OPERATION Separation within the unit is perpetual on a last-in, last-out basis. As oily influent enters the oil- water separator, a corresponding amount of separated effluent is automatically discharged through the effluent pipe. Light oils will accumulate in the top of the separator and fluid or materials heavier than water will collect in the bottom of the first chamber. The following provides a basic description of the flow path through the chambers of the standard McTighe rectangular oil-water separator. I. Inlet and Interceptor/Distribution Chamber The invert of the inlet pipe is above the static operating surface level of the separator to provide positive drainage of the inlet pipe. The inlet pipe is designed to conform to the flow capacity of the separator. The Interceptor/Distribution chamber reduces the separator velocity and spreads the flow out in an even manner throughout the cross sectional area of the separator. Large free oil droplets collect at the operating surface of the Interceptor/Distribution chamber and are transferred through diffusion pipes into the Separation chamber. Sediments or heavy solids fall to the bottom of the Interceptor/Distribution chamber as sludge which is retained for periodic removal. 2. Corrugated Parallel Plate Separator The Corrugated Parallel Plate Separator within the McTighe oil-water separator vastly improves the efficiency of separation by enlarging the effective separation surface area through the use of multiple parallel corrugated plates. Section 3.A—Rev 6/02— 1/I