For gas- and chemical transportation the inert gas needs to be of high purity. For many applications, oxygen levels of 0.5% or even 0.1% are required, in combination with a water dew-point of about -45 °C and sometimes lower

(-65 °C). Also here, the burner is the heart of the system as the inert gas needs to be absolutely soot free in the first place. This is achieved with the Ultramizing® Combustion system. When the gas leaves the generator, it has the right composition, but it is saturated with 100% water and has to be dried. The drying process takes place in two steps. In the first step of the refrigerant cooler, the gas temperature is lowered to 5 °C which results in condensation of a great quantity of water. In the second stage the inert gas is dehumidified further in a double vessel type drying-unit using activated alumina or adsorbent. The whole process operates under a pressure of about 0.3 bar(g).

Low pressure, low dew-point Inert gas Generators are typically used on LNG and LPG carriers. Aalborg Industries Inert Gas Systems is the leading supplier in this segment.