1014.3 Gravity Grease Interceptors. Required gravity

grease interceptors shall comply with the provisions of Section 1014.3.1 through Section 1014.3.7.

For this section, the term “fixture” shall mean and include each plumbing fixture, appliance, apparatus, or other equipment required to be connected to or discharged into a grease interceptor by a provision of this section. 1014.2.2 Vent. A vent shall be installed downstream of hydromechanical grease interceptors in accordance with the requirements of this code.

1014.3.1 General. The provisions of this section shall apply to the design, construction, installation, and testing of commercial kitchen gravity grease interceptors. 1014.3.2 Waste Discharge Requirements. Waste discharge in establishments from fixtures and equipment which contain grease, including but not limited to, scullery sinks, pot and pan sinks, dishwashers, soup kettles, and floor drains located in areas where grease-containing materials exist, shall be permitted to be drained into the sanitary waste through the interceptor where approved by the Authority Having Jurisdiction.

TABLE 1014.2.1 HYDROMECHANICAL GREASE INTERCEPTOR SIZING

USING GRAVITY FLOW RATES ¹

Notes: 1 For interceptor sizing by the fixture capacity see the example below. 2 1 ⁄ 4 inch slope per foot (20.8 mm/m) based on Manning’s formula with friction factor N =.012.

EXAMPLE 1014.2.1

SIZING HYDROMECHANICAL GREASE INTERCEPTOR(S)

USING FIXTURE CAPACITY

Step 1: Determine the flow rate from each fixture.

[Length] X [Width] X [Depth] / [231] = Gallons X [.75 fill factor] / [Drain Period (1 minute or 2 minutes)]

1014.3.4.1 Interceptors. Interceptors shall be placed as close as practical to the fixtures they serve.

1014.3.2.1 Toilets and Urinals. Toilets, urinals, and other similar fixtures shall not drain through the interceptor. 1014.3.2.2 Inlet Pipe. Waste shall enter the interceptor through the inlet pipe. 1014.3.3 Design. Gravity interceptors shall be constructed in accordance with the applicable standard in Table 1701.1 or the design approved by the Authority Having Jurisdiction. 1014.3.4 Location. Each grease interceptor shall be so installed and connected that it shall be easily accessible for inspection, cleaning, and removal of the intercepted grease. A gravity grease interceptor that complies with IAPMO Z1001 shall not be installed in a building where food is handled. Location of the grease interceptor shall meet the approval of the Authority Having Jurisdiction.

206 2019 CALIFORNIA PLUMBING CODE

TRAPS AND INTERCEPTORS

1014.3.4.2 Business Establishment. Each business establishment for which a gravity grease interceptor is required shall have an interceptor which shall serve that establishment unless otherwise approved by the Authority Having Jurisdiction. 1014.3.4.3 Access. Each gravity grease interceptor shall be located to be readily accessible to the equipment required for maintenance. 1014.3.5 Construction Requirements. Gravity grease interceptors shall be designed to remove grease from effluent and shall be sized in accordance with this section. Gravity grease interceptors shall also be designed to retain grease until accumulations can be removed by pumping the interceptor. It is recommended that a sample box is located at the outlet end of gravity grease interceptors so that the Authority Having Jurisdiction can periodically sample effluent quality. 1014.3.6 Sizing Criteria. The volume of the interceptor shall be determined by using Table 1014.3.6. Where drainage fixture units (DFUs) are not known, the interceptor shall be sized based on the maximum DFUs allowed for the pipe size connected to the inlet of the interceptor. Refer to Table 703.2, Drainage Piping, Horizontal.

TABLE 1014.3.6 GRAVITY GREASE INTERCEPTOR SIZING

EXAMPLE 1014.3.6 Given: A restaurant with the following fixtures and equip- GRAVITY GREASE INTERCEPTOR SIZING EXAMPLE ment. One food preparation sink; three-floor drains - one in the food prep area, one in the grill area, and one receiving the indirect waste from the ice machine and a mop sink.

Kitchen Drain Line DFU Count (from Table 702.1): 3 floor drains at 2 DFUs each = 6 DFUs Mop sink at 3 DFUs each = 3 DFUs Food prep sink at 3 DFUs each = 3 DFUs Total = 12 DFUs

Using Table 1014.3.6, the grease interceptor will be sized at 750 gallons (2389 L).

1014.3.7 Abandoned Gravity Grease Intercep-tors. Abandoned grease interceptors shall be pumped and filled as required for abandoned sewers and sewage disposal facilities in Section 722.0.