The Inert Gas is produced by the combustion of fuel oil with air in a water-cooled combustion chamber, in which controlled, complete combustion takes place. The Ultramizing® Combustion system assures soot-free combustion at all times, also at part load conditions. The chamber is indirectly cooled by seawater, whereas after-cooling and sulphur oxide washing occur directly in a specially developed spray and cooling system in a second stage. The clean combustion products, that is Inert Gas with a typical oxygen content of 2% leave the generator at a temperature a few degrees C above that of seawater. The condensed water vapour is discharged together with the cooling water. The combustion process is monitored and controlled by the oxygen analyzer.

The oil-fired Inert Gas Generator is mostly used on Chemical tankers and Product tankers