Description: height of the centre of the inlet pressure gauge; Name: height of inlet pressure gauge 
Description: Height of the zero or centre position of the inlet manometer, or other point as defined by the manometer calibration ; Name: Height of the inlet manometer
Description: internal volume of a compartment, including the volume of nozzles to the first connection (flange, coupling, screwed connection, weld seam) but excluding the volume of internal structures (e. g. baffles, agitators); Name: Filling volume of the equipment