An above-ground, double-walled, tank for holding combustible material and supporting a generator has an outer tank and an inner tank with structural baffles, all made from type 316 stainless steel. An interstitial space formed by the outer tank and inner tank is filled with a fire resistant solution...http://www.google.fr/patents/US7246717?utm_source=gb-gplus-shareBrevet US7246717 - Fire resistant base tank for mounting a generator
