Description: Head observed at inlet area of the installation, corresponding to the sum of the height, pressure head and velocity head  ; Name: Total head at inlet area of the installation
Description: Determined total head at the inlet area of the installation, which corresponds to the sum of geodetic head, pressure head and velocity head; Name: Total head at inlet area of the installation
Description: Alphanumeric designation (starting with DN) of the size for components in a pipeline system, used for reference purposes; Name: Nominal size of nozzle/pipe