Centrifugal PuMP
Centrifugal PuMP
Centrifugal PuMP
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Net Positive Suction Head (NPSH)<br />
NPSH Available (NPSHA )<br />
The Net Positive Suction Head<br />
made available the suction<br />
system for the pump.<br />
The NPSHA can be determined<br />
during design and construction,<br />
or determined experimentally<br />
from the actual physical system<br />
and calculated with the Energy<br />
Equation<br />
Energy at 1 = Energy at 2 + Energy lost between 1 and 2<br />
2<br />
2<br />
p1<br />
p2<br />
V2<br />
p2<br />
V2<br />
p1<br />
z1<br />
<br />
losessinlet<br />
z1<br />
<br />
lossesinlet<br />
g<br />
g<br />
2g g<br />
2g<br />
g<br />
At inlet p 2 = p i ; V 2 = V i and losses inlet = h in + h fi , then:<br />
NPSH available at impeller inlet :<br />
p p 1 vap<br />
NPSH A z1<br />
hi<br />
h<br />
g<br />
g<br />
fi
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