How Do I Size These Grease Interceptors?
Currently, the most common sizing method is still the Restaurant Sizing Formula found in the Florida Plumbing Code (section 1003.5.1), This method gives you a sizing requirement in gallons. Once you have the "Gallons" required, you can find the properly sized Schier unit using the link below.
In addition to the restaurant sizing formula, interceptors can also be sized by flow rates and storage capacity.
To properly size a ASME or PDI approved
grease interceptor you would total the cumulative drainage capacity
of the three compartment sink, all floor sinks, dishwashers, and other
devices that discharge into the grease line. This would give you the
total maximum potential flow rate. Using this maximum potential flow
rate, you will have the necessary flow capacity of the grease interceptor.