The Chicago Plumbing Code

§ 18-29-709

Fixture Units.

§ 18-29-709.1 Values for fixtures.

Drainage fixture unit values as given in Table § 18-29-709.1 designate the relative load weight of different kinds of fixtures that shall be employed in estimating the total load carried by a soil or waste pipe, and shall be used in connection with Tables § 18-29-710A and § 18-29-710B of sizes for soil, waste and vent pipes for which the permissible load is given in terms of fixture units.

§ 18-29-709.2 Fixtures not listed in Table § 18-29-709.1.

Fixtures not listed in Table § 18-29-709.1 shall have a drainage fixture unit load based on the outlet size of the fixture in accordance with Table § 18-29-709.2. The minimum trap size for unlisted fixtures shall be the size of the drainage outlet but not less than 1 1/4 inches (32 mm).

§ 18-29-709.3 Values for continuous flow.

Drainage fixture unit values for continuous flow into a drainage system shall be computed on the basis that 1 gallon per minute (0.06 L/s) of flow is equivalent to one fixture unit.

§ 18-29-709.4 Deliberately omitted.

§ 18-29-709.5 Values for indirect waste receptor.

The drainage fixture unit load of an indirect waste receptor receiving the discharge of indirectly connected fixtures shall be the sum of the drainage fixture unit values of the fixtures that discharge to the receptor. If this drainage fixture value is less than the indirect waste receptor drainage fixture value given in Table§ 18-29-709.1 or Table § 18-29-709.2, then the values in the referenced tables shall be used.