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The required capacity of gravity grease interceptors and gravity grease interceptors with fats, oils and greases disposal systems shall be determined by multiplying the peak drain flow into the interceptor in gallons per minute by a retention time of 30 minutes.
Prefabricated gravity grease interceptors shall be designed and tested in accordance with IAPMO/ANSI Z1001. Manufactured gravity grease interceptors with fats, oils and greases disposal systems shall be designed and tested in accordance with ASME A112.14.6 and IAMPO/ANSI Z1001. Gravity grease interceptors and gravity grease interceptors with fats, oils and greases disposal systems shall be installed in accordance with manufacturer's instructions. Where manufacturer's instructions are not provided, gravity grease interceptors and gravity grease interceptors with fats, oils and greases disposal systems shall be installed in compliance with ASME A112.14.6 and IAMPMO/ANSI Z1001.
(Amend Coun. J. 10-14-21, p. 37722, Art. X, § 3)
Engineered gravity grease interceptors, which are designed by a registered professional engineer or are constructed in compliance with Department of Water Management standards, shall comply with Sections 18-29-1003.3.8.1 and 18-29-1003.3.8.2 and the capacity requirement of Section 18-29-1003.3.7.
(Amend Coun. J. 7-29-15, p. 3537, § 4; Amend Coun. J. 10-14-21, p. 37722, Art. X, § 3)
A grease catch basin shall be located outside a building and shall be constructed of heavy cast iron or equally durable metal, fiberglass or high-density polyethylene, concrete (precast or monolithic) or brick or concrete block construction with the block or brick laid up in portland cement mortar with walls not less than 5 inches (125 mm) thick, and bottom not less than 2 inches (50 mm) thick. The basin shall be watertight. The basin shall be not less than 36 inches (914 mm) in diameter below the top of the highest inlet pipe. The bottom of the basin shall be not less than 36 inches (914 mm) below the invert of the outlet pipe. The outlet pipe shall be trapped with a catch basin trap and made of a material as required by this chapter. The catch basin trap shall have a minimum seal of 4 inches (100 mm) and shall have an accessible cleanout of a minimum of 3 inches (75 mm).
(Amend Coun. J. 10-14-21, p. 37722, Art. X, § 3)
The grease catch basin shall be covered with an all cast-iron cover or cast-iron lid in a stone or concrete ring and with a minimum opening of 16 inches (406 mm) diameter. The lid shall not be less than 1/4 inch (6 mm) thick.
(Amend Coun. J. 10-14-21, p. 37722, Art. X, § 3)
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