11
Ph = Head of liquid column above (+) or
below (–) center line of plunger (PSIA)
equals Head in feet x (0.435) (Sp.Gr.)
Pv = Vapor pressure of liquid (PSIA)
Pf = Friction loss per foot of pipe calculated
from Reynold Number evaluation
(PSIA) (Use 3.2 times average velocity
for calculating friction losses when
referring to a standard pipe losses
table.)
Minimum NPSH = Minimum hydraulic pres-
sure at plunger (listed
under Installation Instruc-
tions).
When operating the pump with a NPSH of less
than atmospheric pressure (negative suction head
or suction lift), special attention should be given to
keep the suction line strainer clean and prevent
other system conditions that might inadvertently
decrease the NPSH available.
NOTE: Obtain our NPSH calculation software
at the Milton Roy web site (miltonroy.com). If
assistance in determining NPSH is needed,
contact the Milton Roy Aftermarket Service
Department.
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