Drainage fixture unit values dfu dfu are used to determine the drainage from fixtures and required capacity of sewer service systems.
Floor sink drainage fixture units.
For a fixture not listed use the highest d f u.
A fixture unit is equal to one cubic foot of water drained in an 1 1 4 pipe over one.
The relationship between volume flow and fixture units is not constant but varies with the number of fixture units.
2 except sinks urinals and dishwashers exceeding 1 fixture unit.
1 dfu 1 cubic foot of water drained through a 1 1 4 diameter pipe in one minute.
Drainage fixtures unit loads and sanitary piping maximum drainage fixture unit dfu loads for sanitary piping.
According to sps table 382 30 1 the drainage fixture unit value of a floor drain is four.
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.
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 floor drain itself adds no hydraulic load.
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 backļ¬ ow sgns c so 42474 pt01 ptg01 hr 001 071 indd 2 6 29 11 12 54 pm.
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.
1 inch 25 mm 1 foot 304 8 mm notes.
1 excluding trap arm.
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.
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.
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 but not less than the drainage fixture unit value given for the indirect waste receptor in table 709 1 or 709 2.
Drainage fixture unit values as given in table 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 710 1 1 and 710 1 2 of sizes for soil waste and vent pipes for which the permissible load is given in terms of fixture units.
And not to exceed three water closets or six unit traps on a horizontal.
Value for a similar listed fixture.
Sps 382 30 3 11 10 10 can a refrigerated storage case receptior of.
