Div. B › Part 7 › 7.5 › 7.5.8 — Sizing of Vent Pipes

7.5.8.5 — Lengths for other Vent Pipes

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(1) When sizing an additional circuit vent, offset relief vent, relief vent, yoke vent and the vent pipe for an interceptor, dilution tank, sanitary sewage tank or sump, or manhole, length is not taken into consideration.

OBC Definitions

Defined terms on this page

additional circuit vent

means a vent pipe that is installed between a circuit vent and a relief vent to provide additional air circulation.

circuit vent

means a vent pipe that serves a number of fixtures and connects to the fixture drain of the most upstream fixture, and “circuit vented” has a corresponding meaning.

interceptor

means a receptacle that is designed and installed to prevent oil, grease, sand or other materials from passing into a drainage system.

offset

means the piping that connects the ends of two pipes that are parallel.

offset relief vent

means a relief vent that provides additional air circulation upstream and downstream of an offset in a soil or waste stack.

relief vent

means a vent pipe that is used in conjunction with a circuit vent to provide additional air circulation between a drainage system and a venting system.

sanitary sewage

means , (a)liquid or water borne waste, (i)of industrial or commercial origin, or (ii)of domestic origin, including human body waste, toilet or other bathroom waste, and shower, tub, culinary, sink and laundry waste, or (b)liquid or water borne waste discharged from a public pool to a drain.

sewage

means sanitary sewage or storm sewage.

vent pipe

means a pipe that is part of a venting system.

yoke vent

means a vent pipe that is connected at its lower end to a soil or waste stack and at its upper end to a vent stack or a branch vent that is connected to a vent stack.

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