Description: pressure of the atmosphere at a specified place and time; Name: pressure of the athmosphere
Description: Mean absolute pressure of the atmosphere measured at the place of installation of the pump ; Name: Atmospheric pressure
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 %