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Prepared by the Task Committee for the updating of MOP 79 of the Pipeline Division of the American Society of Civil Engineers. Steel Penstocks stands as a complete guide to the design, installation, and maintenance of the closed conduits between a free water surface and hydroelectric power stations. This new, thoroughly updated edition provides recommendations and technical guidance for all aspects of steel penstocks, including tunnel liners, wyes, and branch outlets. It also provides practical, comprehensive information regarding the economic, safety, and environmental aspects of designing and implementing steel penstocks at hydropower stations. Chapters offer both background commentary and specific requirements, and a final chapter contains 10 worked examples of design problems. Topics include: design considerations, including economic diameter, shutoff systems, and seismic loads; materials, design criteria, and allowable stresses; exposed and buried penstocks; steel tunnel liners; wye branches and outlets; anchor blocks; appurtenances, bends, and transitions; corrosion prevention and control; welding; manufacture, installation, and inspection; startup; documentation and certification; and maintenance. Hydroelectric engineers, designers, and facility managers use MOP 79 as the go-to reference for steel penstocks.