Other Methods of Inerting Fuel Tanks
Two other methods in current use to inert fuel tanks are a foam suppressant system and a ullage system. The FAA has decided that the added weight of both alternatives make them impractical for implementation in the aviation field . Some US Military aircraft still use Nitrogen based foam inerting systems, and some companies will ship containers of fuel with an ullage system across train routes.
Read more about this topic: Inerting System
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