Services - How your interceptor works

Petrol interceptors are installed at commercial and industrial sites and on car-parks to intercept oil and petrol contained in the storm water run off from hard standings, the image shows a traditional brick built trap where the water passes through three chambers before discharging into a storm water system.

Each chamber outlet has a dip pipe which is extended towards the base of the chamber, the idea being that the oil and petrol will rise to the top of the water with the deeper, cleaner water moving through to the next chamber. An air vent system runs above ground to release the build up of vapour within the tanks.


The purpose of an interceptor is to separate water coming from the drainage system from any contaminants picked up on-route such as oil, silt, dirt and brake dust. Over a period of time these contaminants build up within the interceptor and can either cause blockages or increase the risk of forecourt flooding and the risk of pollutants contaminating the watercourse. If your interceptors are not maintained, the un-separated surface water, run-off from vehicle washing and cleaning activities can damage the environment and pollute rivers, streams, and groundwater also leading to possible risk of prosecution by the environment agency. Regular Interceptor / Separator emptying and cleaning is an important part of keeping any site running efficiently, avoiding environmental incidents and drainage problems.

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