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Grease Interceptor Overview

The following will give you a better understanding of the correct Grease Interceptor configuration. To view larger images, click on the thumbnail.

Grease Interceptor – Note manhole covers with
access over influent and effluent “Ts.”
1500 gallon concrete interceptor Installation of Interceptor
Variety of styles for interceptors - Some do not have proper
baffle configuration and are poorly designed.
Mid-wall with slit of
two compartment interceptors
Many have 6” pipe in mid-wall baffle
PVC “T” – This is the influent side. Concrete style effluent baffle –
Make sure the Effluent baffle or T extends down to depth of Mid-wall slit or hole or to approximately one foot of the bottom of tank
The Aluminum Effluent Baffle collapsed.
Make sure that Effluent T (and Influent T) are made of sturdy material (i.e. PVC 40).
Baffle but no effluent T preventing FOG discharge.
Length that the T extends downward is important, The T’s on the right are too short for a four foot deep interceptor. They would need to extend down to within one to one and a half feet of the bottom of the interceptor
Even with 2 manhole access or even 3 manhole access, some Interceptor designs prevent view of influent and effluent outlets (or T). Some effluents do not have a T or baffle or have been installed incorrectly. Expect approximately 50% of interceptors to be maintained adequately.
Interceptors in series (Two 1,500 gallon interceptors).
This is great but they must be maintained just like other interceptors.
Another Grease Interceptor Diagram

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