Separators

We supply bypass separators and full retention separators to achieve two levels of final discharge into the drainage system. All our oil water separators conform to Environment Agency PPG3 requirements for wastewater treatment.

The bypass separator (Class 1 Discharge) is designed for larger hard standing areas susceptible to hydrocarbon spillages. It retains hydrocarbon contaminants that enter the separator in the first 10% of any storm and achieves a final discharge to surface water drain of less than 5mg/l oil to water.

The bypass separator (Class 2 Discharge) is as Class 1, except the final discharge is to surface or foul water drain and is 100mg/l oil to water.

The full retention separator is for more demanding applications such as fuel storage points, plant hire equipment yards and vehicle dismantling workshops where the risk of hydrocarbon spillages is greater. It is also available to achieve both Class 1 and Class 2 discharge options, as above.

Enquire about separators

Key features & applications
Key features of separators
- Independently tested and certified by the BSI
- Light and easy to install
- Comprehensive range of Class 1 and Class 2 designs
- Silt storage volume inclusive
- Vent points within necks
- Extension access shafts for deep inverts
- Fitted inlet/outlet connectors
- Maintenance from ground level
Bypass separators are used when it is considered acceptable not to provide full treatments for very high flows – typically, when there is minimal risk of a large spillage and heavy rainfall occurring together.

Separators are used in applications such as:
- Surface car parks
- Roadways
- Lightly contaminated commercial areas
Technical specifications & calculations

Download separators specifications (PDF)

Separators brochure

Alarm probe installation guide

Pipe configuration

Can't view the files?
Download Adobe Acrobat Reader
Product range
We have a range of separators to deal with any contaminants such as petrol, oil, grease and silt before they are discharged into the watercourse.
Bypass separators

Used for very high flows, when it is acceptable not to provide full treatment and little risk exists of a large spillage and heavy rain occurring at the same time.

For example:
- Surface car parks
- Roadways
- Lightly contaminated commercial areas
Full retention separators

These treat the full flow that can be delivered by the drainage system, normally equivalent to a rainfall intensity of 65mm/hr.

Used in high-risk spillage areas such as:
- Fuel distribution depots
- Vehicle workshops
- Scrap yards
Forecourt separators

Required for both safety and environmental reasons, these are full retention separators specified to retain on site the maximum spillage likely to occur on a petrol filling station.

Will treat spillages during vehicle refuelling and road tanker delivery.

Washdown & silt separators

Used for car wash and other cleaning facilities that discharge directly into a foul drain which feeds to a municipal treatment facility.

If emulsifiers are present the discharge must not be allowed to enter a Class I or Class II unit.
Gallery