(57) Several embodiments of fuel tank heating systems are described which are particularly
adapted to be removably installed within fuel oil drums and which warm the interior
contents of the drum enabling the fuel to be conveniently withdrawn in conditions
where they are exposed to cold ambient temperatures leading to fuel waxing and solidification.
According to one embodiment of the invention, a combustion-type heating device is
installed within a port of the drum which uses fuel from the drum to support a flame.
Heat transfer units conduct heat from the flame into the drum, thereby warming the
interior contents. According to a second embodiment of this invention, a fuel outlet
conduit is positioned within the fuel drum and is preferably in close proximity with
heating units, thereby enabling fuel to be withdrawn from the interior contents of
the drum. Further, a fuel pump may be submersed within the tank and connected to the
fuel outlet conduit. Each of the systems described may be conveniently installed within
drain ports of fuel oil drums of conventional configuration.
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