16-08-2012, 05:05 PM
DESIGN AND CONSTRUCTION OF AN INDUCTION FURNACE
DESIGN AND CONSTRUCTION .ppt (Size: 584.5 KB / Downloads: 101)
Net Positive Suction Head Available (NPSHA)
It depends upon the elevation or pressure of the suction supply friction in the suction line, attitude of the installation, and the vapor pressure of the liquid being pumped.
hsp = static pressure head (absolute) applied to the fluid, m or ft
hs = elevation difference from the level of fluid in the water tank to the pump inlet, m or ft
If pump is below water tank, hs is positive.
If pump is above water tank, hs is negative.
hf = fraction loss in suction piping, m or ft
hvp = vapor pressure of the liquid at the pumping temperature in meters or feet of the liquid