Patent ID: 7993530

Claim:
A method of changing the oil in a forced draft fan assembly of a power plant, said forced draft fan assembly having a bearing housing, said method comprising the steps of: providing a portable filtration device comprising: a frame; a motor; a pump having a flowrate capacity of from 0.5 to 3 gpm and being connected to, and powered by said motor; an input valve in fluid communication with the pump for fluid connection with an output port of the bearing housing of the forced draft fan; at least one filter in fluid communication with the pump; and an output valve in fluid communication with said at least one filter for fluid connection with an input port of the bearing housing of the forced draft fan; said motor, pump, input valve, at least one filter and output valve all being mounted on said frame, said portable filtration device weighing less than fifty pounds, and being liftably detachable from an associated wheeled frame by a single user; precharging said portable filtration device with oil; transporting and connecting said portable filtration device to said bearing housing of said forced draft fan assembly; filtering oil contained within said bearing housing by pumping said oil from said bearing housing through said portable filtration device while said forced draft fan assembly is in operation, thereby resulting in a filtered oil, and returning said filtered oil to said bearing housing; and disconnecting said portable filtration device from said bearing housing.