Description: smallest delivery head that a pump can deliver without breaking down; Name: smallest head allowed
Description: Minimum permissible head at which the pump can be operated without suffering damage; Name: Minimum allowable head
Description: NPSH-value required for a drop of 3 % in the total head of the first stage of the pump as a standard basis for use in performance curves; Name: Net positive suction head required for a drop of 3 %