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Proper Sizing

Sizing of Grease Removal Devices

In order to perform correctly, grease removal devices must be adequately sized to allow the grease and settleable solids to separate within the device. The sizing Table(s) below is based on the number of Drainage Fixture Units (DFUs) within the kitchen or source (see UPC Chapter 7), and the type of grease removal device used.

Gravity Grease Interceptors

Gravity Grease Interceptor Sizing
DFUs
GGI Volume (gallons)
8
500
21
750
35
1000
90
1250
172
1500
216
2000
307
2500
342
3000
428
4000
Example #1: Typical fast food kitchen = 17 DFUs = 750 gallon GGI
Example #2: Typical larger kitchen = 45 DFUs = 1250 gallon GGI


Hydromechanical Grease Interceptors

Hydromechanical Grease Interceptor Sizing
DFUs
HGI (Gallons per Minute)
8
20
10
25
13
35
20
50
35
75
172
100
216
150
342
200
Example: Typical pot sink with 2-inch trap = 4 DFUs = 20 gallons per minute


If you have any questions or would like additional information, please feel free to contact the Lake County Special Districts Administration at 263-0119.
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Lake County Special Districts
Telephone (707) 263-0119
Fax (707) 263-3836
230 N. Main Street
Lakeport, CA 95453