A compressed air system which initially failed to depress draft-tube water for synchronous condensing operation on a propeller turbine-driven hydroelectric generating unit was tested to determine cause of failure and formulate corrective measures. A hypothesis and certain assumptions concerning air and water action in the draft tube were essentially verified by further testing. Final testing of the modified evacuation air system demonstrated ample capability to attain a synchronous condensing condition. Several conclusions were drawn from the testing and modification work.

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