NPSH module / example
A subcooled liquid flows from a vessel through a pipe. The liquid level is kept at a constant height by an inlet.
We need to determine the NPSH.
|
Volume flow |
V = 20 m3/h |
|
Diameter (of pipe) |
d = 50 mm |
|
Total length (of pipe) |
L = 15 m |
|
Density |
ρF = 720 kg/m3 |
|
Dyn. viscosity |
η = 0,1 mPas |
|
Vapour pressure |
PSatt = 0,8 bar |
|
Temperature |
T = 80 °C |
Condition for operating without cavitation: NPSH actual ≥ NPSH required
After having entered the pressure volume curve, the head of the plant and the pump curve can be presented graphically.
The system is shown in a sketch on the input mask.
