Description: Rotor resonant frequency calculated assuming that the rotor is supported only in the bearings and that the bearings have infinite stiffness; Name: crit speed (dry)
Description: Rotor resonant frequency calculated considering the additional support and damping produced by the action of the pumped fluid within rotor  ; Name: Wet critical speed
Description: greatest difference between the total energy height at the outlet side of the pump aggregate and the total energy height of the intake side of the pump aggregate at operating point; Name: maximum feed height