Steel Penstock Design for Tims Ford Dam

by George E. Day, (M.ASCE), Principal Civil Engineer (Structure Steel); Div. of Engrg. Design, Tennessee Valley Authority, Knoxville, TN,
Horace S. Beckner, (A.M.ASCE), Civ. Engr. (Struct. Steel); Div. of Engrg. Design, Tennessee Valley Authority, Knoxville, TN,


Serial Information: Journal of the Power Division, 1971, Vol. 97, Issue 1, Pg. 203-208


Document Type: Journal Paper

Abstract: The design and construction of an embedded steel penstock is discussed. A straight line trench, from intake to powerhouse, cut into the rock under the left side of the dam reduced construction time. The concrete encasement is designed to carry the dead load of the rockfill dam and shell. Shell and stiffeners made of A 516, grade 60 are designed for internal head of 235 ft and an external head of 153 ft. Allowable working stress of 60% of yield strength gave a safety factor of three. Hydrostatic tests of the penstock in place along with 100% radiographing of all shell welds was required.

Subject Headings: Conduits | Steel construction | Water intakes | Earthfill dams | Concrete dams | Trenches | Power plants | Rocks

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