Posted By Nick Nicholls We are looking to reduce our quality of Nitrogen from 99.95% to 98%. I don't believe this will present a combustion problem when the Nitrogen is used as an inert gas as the Oxygen content will be very small. Only a 1/5th of the remaining 2%. Does anyone have any figures on the amount of O2 required to support combustion

Posted By Jane Blunt In an ordinary room, at atmospheric pressure, most normally combustible items will not burn if the oxygen percentage is below about 15%. There are some fire suppression systems on the market that work on this principle. However, this may not be relevant if your nitrogen atmosphere is being used for more specialised purposes. Jane