SEWER FIXTURE UNITS
SEWER FIXTURE UNITS
(OP)
Hello all. I am working with an architect that gave me sewer flow in sewer fixture units. Please provide a conversion factor or chart for SFU to gpd or gpm. Thanks.
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RE: SEWER FIXTURE UNITS
Suggest that you work with DFUs rather than making a conversion to a flow rate - otherwise the sewer system may look oversized in the your calcs, but be undersized in practice.
Here is a chart to help
http://www
www.SlideRuleEra.net
RE: SEWER FIXTURE UNITS
The classic sanitary sewer scenario is a community of houses producing X gpm, which is based on population. That scenario is not a good model for several mixed-use buildings tied to one main sanitary sewer system. I would like to take the fixture units for each connection to the buildings and convert to gpm (to convert to cfs). Then I can use Manning's equation to size my pipe.
I understand that sewage flow is not laminar, steady-state flow, and that it is more of an impulse. However, max flow would be produced by all the fixture units releasing continually until a steady-state flow is achieved.
Please correct me if I am off-course with this line of thought.
RE: SEWER FIXTURE UNITS
For example, a 4" dia pipe at 1/4 inch slope can handle 216 fixture units.
The fixture unit is an arbitrary, comparative value assigned to a specific plumbing fixture, device, or piece of equipment. Fixture Unit values represent the probable flow that fixture will discharge into a drainage system, compared to other fixtures.
RE: SEWER FIXTURE UNITS