head loss in water distribution system
head loss in water distribution system
(OP)
I am working on a project that has two existing submersible well pumps. These pumps discharge directly into the water distribution system. How do I compute the head loss from the pumps to the water towers?





RE: head loss in water distribution system
RE: head loss in water distribution system
Steve Wagner
RE: head loss in water distribution system
Any calculation should be calibrated to actual field measurements if possible. Hydrant tests should be done at a few locations between the pump and the tank. They should also be done at different times of the day and especially during peak flow times. Residual pressures should be compared to what the computer analysis predicts. Roughness factors, usage demand and flow rates should be adjusted as necessary to calibrate the model.
You should also look at any data you can on the existing pumps such as power consumption, flow rates and compare it to the spec values to determine if they are operating as expected.
RE: head loss in water distribution system
Is you question how to calculate head loss with one pump running or both pumps running ? Also, how are these pumps connected through the system and to the tank(s)?
While Hazen-Williams is widely used, my own preference is for the Darcy Weisbach equation. The free program, EPANET, can be used to do the analyses for you.
good luck
RE: head loss in water distribution system
I'm trying to calculate the head loss with one pump running and both pumps running. The pumps discharge directly into the water main system. The mains are connected directly to the towers. There are not dedicated lines from the pumps directly to the towers.
RE: head loss in water distribution system
good luck
RE: head loss in water distribution system
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Resources, Tools and Basic Information for Engineering and Design of Technical Applications!
Pumps in Parallel or Serial Connection
For pumps in serial - add heads, for pumps in parallel - add flowrates
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Pumps can be arranged in serial or parallel to provide additional head or flowrate capacity.
Pumps in Serial - Heads Added
When two (or more) pumps are arranged in serial, their resulting pump performance curve is obtained by adding heads at the same flowrate.
pumps in series
For two identical pumps the head will be twice the head of a single pump at the same flow rate.
Pumps in Parallel - Flow Rate Added
When two or more pumps are arranged in parallel, their resulting performance curve is obtained by adding their flowrates at the same head.
pumps in parallel
For two identical pumps the flow rate will be twice the flowrate of a single pump at the same head.
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Related Topics
* Pumps Pumps and piping systems ....
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* Centrifugal Pumps An introduction to Centrifugal Pumps
* Static Pressure and Pressure Head in Fluids Static pressure and pressure head in fluids
* System Curve and Pump Performance Curve To select a proper pump for a particular application it is necessary to utilize the system curve and the pump performance curve
* Alternating Pumps Secure the system and achieve equal wear by alternate pumps in parallel
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RE: head loss in water distribution system
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RE: head loss in water distribution system
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RE: head loss in water distribution system