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jasonyp
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can anyone tell me how to find the pressure head and residual head?
the Q is depend on which?
the Q is depend on which?
Mech_Engineer said:330 gallons per day seems very low for 82 houses (that's an average of 4 gallons per day per house)
Bob S said:Typical suburban indoor water use in the U.S. is 65 gpcd (gallons per capita per day) so a typical house indoor usage for 3 people would be 200 gpd (gallons per day). Including outdoor for garden would easily be 300 gpd. Static head pressure at homes is probably 50 psi (pounds per square inch) minimum to 75 psi maximum. You should check these numbers with local utility. Is this water gravity fed from a water tank, or is this a pressurized system with a pneumatic ballast tank?
russ_watters said:No, I'm pretty sure you mistook gal/min for gal/day... 330 gpd is .22 gpm,
The second task is then to size the pipe. You need the flow rate you just calculated (perhaps you already have it if you just got the units wrong - 330 gpm sounds about right),
You are right. If a worst case scenario was a simultaneous 5 gpm per house, then the total demand would be over 400 gpm for the 82 houses.russ_watters said:It is easy to envision real-world scenarios where an 82 house development could exceed 100 or 200 gpm. There are specific times during the day when usage is much higher than other times. From 5:30-7:30 am, for example(and peaking from 6-7), a very high fraction of the houses will have multiple people taking showers at a flow rate of 2.5 gpm per shower for the length of the shower. In addition, there will be several toilet flushes per house at 2.5 gal/flush and faucets running for a few minutes at a time at 1gpm.
The purpose of designing a water supply system is to ensure that clean and safe water is available for human consumption, as well as for various other purposes such as agriculture, industry, and firefighting.
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A water supply system typically consists of a source of water, a treatment plant, a distribution network, storage facilities, and individual service connections to buildings. Other components may include pumps, valves, and meters.
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