SIZING A PRESSURE TANK
SIZING A PRESSURE TANK
(OP)
I am sizing a pressure tanks for a small subdivision.
Here is the data:
Instantaneous peak demand = 60 gpm
avg pump discharge = 200 gpm
I have had some people suggest that I provide for 8 minutes of pumping time. I have had others say that it doesnt matter how long the pump stays on as long as the "number of pump starts" is not excessive. Since the peak demand and avg pumping rate are so different it is much more economical to size the tank to provide 8 minutes of storage rather than keeping the pump on 8 minutes. any insight will be helpful. thx.
Here is the data:
Instantaneous peak demand = 60 gpm
avg pump discharge = 200 gpm
I have had some people suggest that I provide for 8 minutes of pumping time. I have had others say that it doesnt matter how long the pump stays on as long as the "number of pump starts" is not excessive. Since the peak demand and avg pumping rate are so different it is much more economical to size the tank to provide 8 minutes of storage rather than keeping the pump on 8 minutes. any insight will be helpful. thx.





RE: SIZING A PRESSURE TANK
I don't work in this field and probably can't help, but I have a couple questions for you:
1) Shouldn't the instantaneous peak demand be higher than the average demand, or is the peak demand the highest required flow with the pumps being capable of supplying 200 gpm?
2) What is the average flow into the tank (is is relatively constant)? This may be more of a sizing criteria than the outlet flow.
jproj
RE: SIZING A PRESSURE TANK
RE: SIZING A PRESSURE TANK
RE: SIZING A PRESSURE TANK
If you are chlorinating, you should also consider detention time separate from the above.
You might check with your state to see what their standard requirements are before under/oversizing the tank.
RE: SIZING A PRESSURE TANK
RE: SIZING A PRESSURE TANK
Look into Advance Water Distribution Modelling handbook for sizing your systems.
Do Civilquiz on the www.haested.com site to get a discount on the book.
RE: SIZING A PRESSURE TANK