Rocky Mountain Pump-Turbines and Related Mechanical Equipment

by James H. T. Sun, Harza Engineering Co, Chicago, United States,
Ben C. Goss, Harza Engineering Co, Chicago, United States,

Document Type: Proceeding Paper

Part of: Waterpower '91: A New View of Hydro Resources


The Rocky Mountain powerplant will have three reversible, single stage, vertical shaft pump-turbine units, each having a maximum output of 321 MW generating and a maximum pumping capacity of 5170 cfs, requiring a pump input power of 315 MW. Each unit is served by a separate penstock branch from a common power tunnel. Each unit is provided with a spherical type guard valve, joining the unit penstock and pump-turbine spiral case. This article discusses the selection of the pump-turbine, guard valve and governing equipment. The pump-turbine salient features, performance characteristics and design modifications are described and discussed. Other major equipment such as the cranes, gates and trashracks are described. The mechanical support systems, including cooling water, compressed air, suction-draft tube depression, station drainage, unit fill and unwatering, penstock flow measuring and lubricating oil systems are described. Finally, the upper reservoir and tunnel filling and draining systems are described.

Subject Headings: Drainage systems | Conduits | Mountains | Pumps | Hydro power | Flow measurement | Pumping stations | Power plants | Rocky Mountains

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