Bypass oil separators
Protect your property, location and the environment by choosing Rewatec bypass separators, designed specifically for small spillage occurrences or where the risk of a spillage is low.
Ideal for low risk floods
Ideal for low risk floods
Suitable for car parks and roads
Suitable for car parks and roads
Easy to install
Easy to install
Prevent contamination
Prevent contamination
What are bypass separators?
Rewatec bypass oil separators (formerly Conder bypass separators) are for use with surface water drainage systems and are designed to prevent hydrocarbons such as diesel, petrol and engine oil from mixing with surface water and entering drainage systems.
Bypass separators, which are also known as petrol interceptors, are used to fully treat all flows generated by rainfall rates of up to 6.5 mm/hr. They are used when it is considered an acceptable risk not to provide full treatment for high flows, such as low risk flood applications or where the risk of a significant spill is small.
Example applications
- car parks
- roadways, motorways and major trunk roads
- light industrial and goods yards
How does a bypass separators work?
Bypass separators are manufactured to treat all flow rates up to the designed nominal size. Any flow in excess of the nominal size (i.e. during heavy rainfall) is allowed to bypass the separation chamber, thereby keeping the separated and trapped oil or fuel safe.
Pollution prevention is a critical part of sustainable drainage systems and statutory regulations are in force to control the discharge of hydrocarbons such as oil or fuel.
Step 1
During the early part of a rain storm, all the contaminated water flow passes through the sediment collection chamber and enters the separation chamber.
Step 2
All the oil then proceeds to the separation chamber where it is separated (through a coalescing filter) to the Class 1 standard of 5 mg/L and safely trapped.
Step 3
As the rainstorm builds up to its maximum and the level of oil contamination reduces significantly, the nominal size flow continues to pass through the separation chamber and any excess flow of virtually clean water is allowed to bypass directly to the outlet.
Bypass separator maintenance
A full suite of services is available through Premier Tech’s extensive network of trusted service partners.
We stand by our products
For over 50 years, we have proudly developed sustainable and long-lasting products that make a real difference for our customers, our professional partners, and, above all, our planet.
Our experience in the industry allows us to give you a complete 25 year warranty for Rewatec bypass separators.
Training programmes
At Premier Tech we provide a full range of training programmes to fully meet the requirements of our professional partners. If you require product functionality guidance or a more detailed training course for installations, we can provide a solution to meet your needs.
Bypass separator guides and manuals
Commissioning and maintenance guide
Technical information
Our Rewatec bypass separators are designed and tested to BS EN858 parts one and two, and can be installed for drainage areas ranging from 1,667m2 to 277,778m2.
Available products
We offer a complete range of Rewatec bypass separators to meet your needs. Wherever your site, whatever the regulations.
Our nominal size Bypass GRP separators are available in a number of sizes to perfectly suit your needs.
Class 1
Separators are designed to achieve a concentration of less than 5 mg/L of oil under standard test conditions.
- 1,667m2 to 277,778m2 drainage areas
- 1.44m to 12m lengths
- 1m to 4m diameters
This product is no longer available
The Rewatec bypass separator has been discontinued in the UK, but we have other solutions available. Reach out to our team today for assistance for your upcoming project.
