miscellaneous information
Reading time:time taken to drain out a tank having a constant horizontal section and a hole drilled into its floor
Time taken to drain in seconds :
time taken to drain a conical tank
pumps (figure 44)
hydraulic motors
The power to be delivered, expressed in kW, is :
Q = flow rate to be delivered, in m3·h–1,
H = total static head (in metres of head),
Δh = head loss through pipes (metre of head)
r = pump efficiency (between 0.6 and 0.9).
When the speed of rotation n reaches n’ = kn, centrifugal pump characteristics obey the following relations :
The power to be delivered, expressed in kW, is :
Q = flow rate, in m3·h–1,
H = water falling head in metres,
r = turbine efficiency.
Values for r :
- Hydraulic impeller : 0.70 to 0.75
- Propeller and Francis turbine : 0.70 to 0.88
- Kaplan and Pelton turbines : 0.70 to 0.92
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