What are the main characteristics of the penstock and outlet pipes?
Forty-four thousand tons of steel were formed and welded into 14,800 feet of pipe varying from 8 to 30 feet in diameter. Each length of the largest pipe – 12 feet long, 30 feet in diameter, and 2 inches thick – was made from 3 steel plates, of such weight that only two plates could be shipped from the steel mill to the fabricating plant on one railroad car. Two such lengths of pipe welded together make one section weighing approximately 135 tons or, at intersections with the penstocks, as much as 186 tons.
