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Sizing Method Sizing of Grease Interceptors is based on the volume of waste water in gpm (gallons per minute) that can be served. Selection of Grease Interceptors depends on the type desired and the interceptor's rated capacity in gpm. The National Plumbing Code and others list drainage fixture-unit values of various plubming fixtures. For fixtures not listed, these codes show drainage fixture-unit values based on drain outlet or trap size. Fixture-unit values are converted to gpm discharge rates on the basis of the one fixture-unit equaling 7.5 gpm discharge from the fixture. This information is shown in the "Sizing Table." After the gpm rate of discharge has been determined for the fixtures, refer to the "Grease Interceptor Selection Table" for the Grease Interceptor required. For unusual installations requiring special attention, contact your Wade representative. Sizing Procedure The double compartment sink shown in the sizing example is equipped with two two-in. drain outlets. The "Sizing Table" on this page indicates that each two-in. drain outlet can produce 22.5 gpm discharge. Thus a total discharge rate of 45 gpm is the sizing requirement.

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Tyler Pipe/Wade Division - P.O. Box 2027 - Tyler, TX 75710-2027 - Voice: (903) 882-5511 - Fax: (888) 879-9233