The sizing of grease traps is determined by the rate of the incoming flow measured in gallons per minute of GPM. The capacity required for the grease trap is directly related to the GPM in a ratio of twice the pound capacity to the GPM. For example a 10 GPM flow would require a 20-pound grease interceptor capacity. For determining the grease trap capacity for pot washing sinks the capacity of the sink must be determined in cubic inches by multiplying the length by width by depth. Then take the combined cubic inches of all compartments and divide by 231. After multiplying the total by 0.75, for displacement, that provides the GPM for that sink. When multiple sinks are being drained, use 100% for the first sink, 50% for the second and 25% for all others to determine the flow rate for the grease filter.
For sizing of grease traps for restaurants dish washing machines the PDI recommends that each machine has its own grease trap. The sizing for these machines is as follows:
|Dishwasher Tank Capacity
|Recommended Grease Trap
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