Floor Sink Drainage Fixture Units

For a fixture not listed use the highest d f u.

Floor sink drainage fixture units.

Drain fixture unit or dfu is a plumbing design factor or a relative measure of the drain wastewater flow or load for various plumbing fixtures. 1 dfu 1 cubic foot of water drained through a 1 1 4 diameter pipe in one minute. A fixture unit is not a flow rate unit but a design factor based on the rate of discharge time of operation and frequency of use of a fixture. Drainage fixture units for bathroom groups 712 3 3 sump pump and ejector discharge pipe and fittings 712 3 5 sump pump connection to the drainage system 715 1 fixture protection from sewage backfl ow sgns c so 42474 pt01 ptg01 hr 001 071 indd 2 6 29 11 12 54 pm.

According to sps table 382 30 1 the drainage fixture unit value of a floor drain is four. For a continuous or semicontinuous flow into a drainage system such as from a pump or similar device 1 5 fixture units shall be allowed per gpm of flow. Value for a similar listed fixture. Drainage fixtures unit loads and sanitary piping maximum drainage fixture unit dfu loads for sanitary piping.

Drainage fixture unit values dfu dfu are used to determine the drainage from fixtures and required capacity of sewer service systems. Dfu drainage fixture unit values is defined by the the uniform plumbing code upc and can be used to determine required drainage capacities from fixtures and their service systems. A floor drain itself adds no hydraulic load. 4 only four water closets or six unit traps allowed on a vertical pipe or stack.

And not to exceed three water closets or six unit traps on a horizontal. Here are two quantitaive measures of dfus. A fixture unit is not a flow rate unit but a design factor based on the rate of discharge time of operation and frequency of use of a fixture. A fixture unit is equal to one cubic foot of water drained in an 1 1 4 pipe over one.

1 inch 25 mm 1 foot 304 8 mm notes. Since a garage catch basin is a modified floor drain the dfu value of a garage catch basin is also four regardless of the number of fixtures or trenches connected to the basin. 3 except six unit traps or water closets. Drains and sewers drainage fixture units dfu connected to building drains and sewers.

The relationship between volume flow and fixture units is not constant but varies with the number of fixture units. 1 excluding trap arm. 2 except sinks urinals and dishwashers exceeding 1 fixture unit.