Seal oil supply system using differential pressure accumulator

An oil supply system for first and second shaft seal sets at opposite ends of a generator wherein each shaft seal set includes an air seal and a hydrogen seal and wherein each seal set is pressurized by oil supplied by a pump via first and second main conduits, respectively, at a predetermined pressure above internal gas pressure of the generator;

• at least a pair of differential pressure accumulators, each having a barrel with an inlet at an upper end thereof and an outlet at a lower end thereof, and a piston slidably mounted on the barrel to provide an upper chamber in communication with said inlet and a lower chamber in communication with said outlet;
• the outlet of one of said accumulators arranged to supply seal oil to one of said main supply conduits and the outlet of the other of said accumulators arranged to supply seal oil to the outer of said main supply conduits;
• the inlets of both of said accumulators arranged to receive oil drained from said first and second seal sets at a pressure equal to internal gas pressure of said generator.

An oil supply system for first and second shaft seal sets at opposite ends of a generator wherein each shaft seal set includes an air seal and a hydrogen seal and wherein each seal set is pressurized by oil supplied by a pump via first and second main conduits, respectively, at a predetermined pressure above internal gas pressure of the generator;

• and means for temporarily supplying seal oil to said first and second shaft seal sets said means for temporarily supplying seal oil having liquid supplied thereto at a pressure at least substantially equal to the internal gas pressure of the generator.