Oil separation

Typical gravity oil separators are the API oil separator (that separate big amounts of oil and suspended solids from the wastewater effluents of oil refineries) without any components inside the tank, the PPI (parallel plate interceptor) oil separator with parallel plates inside the tank, and the CPI (corrugated plate interceptor) oil separator with corrugated plates inside the tank.

The CPI separator’s main function is to remove oil from oily drain water.
Since solids may also be present, CPI separator is equipped with Cross Flow type corrugated plate pack assemblies. The oily water flows through the plate assembly in a horizontal direction. Oil and solids are separated from the water between the plates. Separated oil droplets collect in the crests of the corrugation and rise upwards. Solids collect in the troughs of the corrugations and slide downwards. Cross Flow type plate packs are capable of separating oil and solids simultaneously.

Average performances of a CPI/API Separators are: inlet 5,000 - 20,000 ppm - removal efficiency 90% - 500 - 2000 ppm outlet.

Benefits of Gemwater oil separation system:
high removal efficiencies;
low CAPEX and OPEX;
low installation costs;
few moving parts;
low maintenance;
relatively small vessel;
adaptable design.