Abstract
High head pumped storage plant designs have required drastic changes in steel plate specifications and welding procedures for penstocks and tunnel liners. Salient data are reviewed for six penstock projects at Lewiston, NY; Smith Mountain, VA; Oroville, CA; Yards Creek, NJ; Cabin Creek, CO, and Seneca, PA. Previous plate material specifications for penstocks were made obsolete by revisions in 1968 and 1969 ASTM standards. Design unit stress maximum limits of less than one-third of tensile strength or two-thirds of yield strength have important precedents. Testing decisions require evaluation of widely varying factors. In penstock fabrication and welding specifications, it is logical to take advantage of ASME Pressure Vessel, Section VIII, Division 1, applicable clauses. Future closer cooperation will be required between consulting or owner engineers and experienced technical representatives of penstock fabrication and construction companies in order to obtain economical designs specifications for penstocks.
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