Oil Separatorsfor uncovered paved areas

The main feature of this type of oil separators for large paved areas is their capacity to treat the whole rainwater runoff from a surface at any time and to direct, through a level spillway, the surplus water, separated from oil and sludge, to the drain.

Such treatment systems are made up of one or more sludge separation and sedimentation tanks and by at least one oil separation chamber, fitted with an intermediate wall, inlet and outlet siphon tube and water-repellent oil-absorbent pads. Optional coalescer filter and safety float.

Oil separators for uncovered paved areas
Oil separators for uncovered paved areas

Sizing criteria

Our technical department is in charge of sizing each item according to specific hydraulic calculations,to the customer’s specific requirements, and to rainwater flow and intensity as per provisions set forth by law.

Yield is guaranteed by retention time duration, by the siphon tubes and by the intermediate wall found in the central part of the oil separator, behind which oil builds up.

Running and maintenance and operation versatility

This type of treatment does not require pumps, sensors and electrical panels, hence power consumption and running issues pertaining to electromechanical devices are non-existent.

As the tanks are fitted with level spillway, the system is not affected by variation in rain intensity and is therefore suitable for treating just few litres as well as heavy flows.

In addition, differently from first flush tanks, the system also treats and separates the oily and settleable substances contained in surplus rainwater exceeding the 5 mm limit.

Such feature is extremely convenienet in the case of accidental oil spill throughout the whole duration of a meteorological event.


Our technical department is able to provide custom solutions to meet all users’ special requirements.

One adequately sized oil separator is sufficient for small areas, while larger surfaces require a sequence of tanks. In areas exceeding 22,000 sq m surface, incoming flow must be split up into two lines operating in parallel.

In areas subject to heavy traffic, or used as a parking lot, it is advisable to increase the number of tanks to achieve a better degree of separation of oily and settleable materials.

In areas used for storing material, or for performing specific processes, treatment efficiency must be assessed according to each single case.