Suction Head - Lorentz PS Série Manuel D'installation Et De Fonctionnement

46 Pump Installation

8.4.4 Suction Head

The maximum suction head is limited by the local air pres-
sure, the water temperature of the medium, the pipe losses
and the NPSH value of the pump.
CAUTION – If the suction pressure in the
pump is lower than the vapor pressure of
the fluid, cavitation will occur. Cavitation
creates noise and will damage the pump.
Damage due to cavitation is not subject to
warranty. To avoid cavitation, the pressure
of the fluid must be maintained above its
vapor pressure at all points as it passes
through the pump.
The maximum suction head (H) must be calculated in
advance. The LORENTZ pump sizing software COMPASS can
be used for NPSH calculation.