Abstract
Abstract The ultimate power development for the Grand Coulee Dam includes eighteen main units of 150,000 hp each and three station-service units of 14,000 hp. Individual penstocks of 18 ft diam were provided for the main units and of 6 ft diam for the station-service units. The penstocks are of welded-plate steel construction, fabricated and X-rayed in accordance with the API-ASME Code. The 18-ft penstocks were fabricated in a plant erected near the dam, and the 6-ft penstocks were produced in the subcontractor’s shop. All penstocks were installed in octagonal tunnels provided for that purpose through the dam, and were embedded in reinforced concrete after installation.
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