The Cougar Project—Turbine Runner Replacementby Rodney J. Wittinger, US Army Corps of Engineers, Portland, OR, USA,
Abstract: The Cougar turbine runners have been subjected to a substantial amount of cavitation damage which has required repair by welding. The continued welding repair has subsequently resulted in cracks in the weldments, cracks in the base metal of the runner, and the loss of portions of the buckets. The repair of the resulting cracks and the replacement of the lost material was considered impracticable and uneconomical. Therefore, activities commenced to replace the runners. Proposals were solicited to replace the existing runners with runners of modern design and materials. The successful bidder was Allis-Chalmers (now Voith Hydro). The scheduled completion of installation of the replacement runners is September 1987. The development of specifications and design features and problems encountered in design, bid evaluation, manufacturing and installation are to be discussed.
Subject Headings: Welding | Cracking | Turbines | Hydraulic design | Cavitation | Metals (material) | Scheduling
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