§ 16.24.040. General criteria—Grease interceptor size  


Latest version.
  • Each food service establishment shall be served by an approved grease interceptor(s) and sized by volume based on the maximum potential drainage fixture units. All fixtures with a potential to carry grease waste shall be plumbed to the grease interceptor. The following DFUs shall be assigned to each individual fixture.

    Table 1
    Individual Fixture DFU
    Bar Sink 2
    Dishwasher—(Commercial) 6
    Floor Drain 3
    Hand wash Sink 1
    Mop Sink 3
    2 compartment Sink* 2
    3 or 4 compartment Sink* 4
    Service Sink (Utility, Janitorial) 3
    Pre-Rinse Sink 4
    Floor Drain (Emergency Shower) 0
    Food Waste Grinder 6
    Work Stove 4
    Ice Maker 0
    Clothes Washer (Domestic) 3

     

    *  Includes Food Prep and Pot washing sinks

    For Fixtures not listed above, use the following equivalents:

    Table 2
    Drain Size of Fixture DFU
    1¼ inch 1 Unit
    1½ inch 3 Units
    2 inch 4 Units
    3 inch 6 Units
    4 inch 8 Units

     

    Interceptor Sizing: The volume of the interceptor shall be determined by adding the total number of DFUs from the grease waste fixtures listed in Tables 1 and 2, and using the following table. If the DFUs are not known, the interceptor shall be determined based on the maximum allowable DFUs for the pipe size connected to the inlet of the interceptor.

    Table 3
    DFUs* Interceptor Volume in Gallons
    < 8 Eligible for interceptor exemption
    8 500
    21 750
    35 1,000
    90 1,250
    172 1,500
    216 2,000
    307 2,500
    342 3,000
    428 4,000
    576 5,000
    720 7,500
    2112 10,000
    2640 15,000

     

    *  The maximum DFUs plumbed to the drain lines that will be connected to the grease interceptor.

(Ord. No. 47-553, § 5, 8-24-2007)