Oil Water Separators

O’Reilly Oakstown’s high-efficiency coalescence Oil Separators are fitted to surface water drainage systems to protect the environment from oil pollution.

Oakstown separators conform to the European standard EN 858 for the design and use of prefabricated oil separators.

All separators fulfil European standards achieving results of oil removal much lower than 5 mg/L.

Oil Water Separator Installed By O'Reilly Oakstown

Oil Water Separators

O’Reilly Oakstown’s high-efficiency coalescence Oil Separators are fitted to surface water drainage systems to protect the environment from oil pollution.

Oakstown separators conform to the European standard EN 858 for the design and use of prefabricated oil separators.

All separators fulfil European standards achieving results of oil removal much lower than 5 mg/L.

Oil Water Separators

Based on performance under the BS EN 858 standard testing, there are two classes of separator:

Class 1: designed to achieve a discharge concentration of less than 5 mg/litre of oil under standard test conditions. These separators are required for discharges to surface water drains and the water environment.
Class 2: designed to achieve a discharge concentration of less than 100 mg/litre of oil under standard test conditions. They are suitable for dealing with discharges where a lower quality requirement applies such as discharges to the foul sewer (check with sewer provider).

Both classes can be produced as ‘full retention’, ‘bypass’ or ‘forecourt’ separators.

Advantages

  • Reliable & Durable – Steel reinforced concrete
  • Efficient & Economical
  • Large capacity
  • EN 858 Certified
  • ISO 9001 2015 Certified
  • Full installation service from the Oakstown team

We offer a number of types of Oil Water Separators: Full Retention Separators, Bypass Separators, Forecourt Separators, Others – Wash-down Separators, Silt Traps

More Details

More on Separator Types

The ‘full flow’ is normally equivalent to the flow generated by a rainfall intensity of 65 mm/hour.

Full retention separators are used where there is a risk of regular contamination with oil and a foreseeable risk of significant spillages e.g. vehicle maintenance areas and retail fuel forecourts.

Bypass separators treat all flows generated by rainfall rates of up to 6.5 mm/hour, covering most rainfall events. Flows above this rate bypass the separator.

These separators are used when it is considered an acceptable risk not to provide full treatment for high flows, e.g. where only small spillages can occur and the risk of spillage is small.

It is not acceptable to use a by-pass separator where a large spillage might occur.

The term ‘forecourt’ refers to all forms of liquid-fuel dispensing outlets, both retail and non-retail, including those where only diesel is dispensed.

A forecourt separator must be a ‘full retention’ separator, large enough to serve the catchment area of the site and have a sufficient oil storage volume to retain any foreseeable spillages.

On a forecourt where tanker deliveries are received, a separator with an oil storage capacity of 7,600 litres will meet the requirements of BS EN 858-2.

Wash-down separators are generally used in areas such as car/truck wash and various cleaning systems that discharge directly into a municipal treatment facility.

Discharges from wash-down separators must not be allowed to enter the surface water drainage system or a fuel/oil separator.

The likely presence of emulsifiers such as detergents will disperse oils and will reduce the separation efficiency of all separators.