Description: smallest head at which the pump may be operated permanently; Name: smallest head allowed while operation
Description: Minimum permissible head at which the pump can be operated without suffering damage; Name: Minimum allowable head
Description: measure of the increase in the liquid to be pumped, water, on a pipe connected vertically to the pump when the flow rate is zero. related to the operation of the pump at 2,900 rpm with the current impeller size; Name: pump shut-off head for actual impeller diameter at 2900/min