Sanitary line size
Sanitary line size
(OP)
I need to design a sanitary line, I am using the building drains and sewers to select the maximum number of drainage fixture units connected to any portion of the building on the building sewer. In this moment i am design a office building with 2400 drainage fixture units to 1/16 inch slope per foot, so i need to use 10" diameter of pipe. But other designer said that i need to apply a diversity factor of 0.6 according the ASPE to the hunter curve. After apply this factor the quantity decrease to 1440 dfu. Therefor the pipe size will be 8" Any body could help me to resolve this doubt.





RE: Sanitary line size
The fixture unit values have been revised over the years since the development of the Hunter method using long term data and modern statistical methods and analyses.
If you are using modern fixture unit values, you do not use the diversity factor
RE: Sanitary line size
By the way the sanitary civil engineer that design the utility sewer line, What kind of concept do they use to design this line. Because i think that they use other tables to size these lines. the values show in the Plumbing Codes indicate higher values.
Could you clarify it??
RE: Sanitary line size
Where I'm at, here are some of numbers we usefor daily flow:
Office & Business PE = 0.15/worker/shift
Factories PE = 0.35/person/shift (not incl indust. wast)
Hospitals PE = 2.5/bed
School PE = 0.15/person (w/o gyms, cafetertia)
School PE =0.25/prtdon (w/ gyms and cafeterias)
RE: Sanitary line size
Maury described the first method, the per capita flow method.
If your flows deviate from the per capita estimate, you can use the second method as an alternative to the per capita flow method. The second method is to prepare a detailed study and estimate using fixture flow rates. You will also have to prepare a brief decription of the procedures used in your evaluation.
RE: Sanitary line size