Conclusions
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1.
Owing to the sucessful hydraulic tests an adequate guarantee was obtained for the safe operation of the unencased downstream ends of the first-stage penstocks of the Nurek hydroelectric station, at service pressure.
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2.
Based on the results of tests at a pressure of 18kg/cm2 it is expected that at 36.8kg/cm2 there will be an overstress of 20% in the reinforcing plates of the manhole T-piece, if the T-piece is not encased in concrete. As the T-piece will be enclosed in a reinforced-concrete lining designed to carry the full internal pressure with a safety factor of the order of 1 its strength can be regarded as guaranteed.
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3.
The stressed state of the bend corresponds, in the main, with the computed conditions.
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4.
The tests disclosed no general beam flexure of the downstream end of the penstock.
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Literature Cited
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F. M. Svoiskii, “Built-up shell of pipe bend type, Dissertation, Leningrad State University (1970).
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Yu. A. Shimanskii, Structural Mechanics of Submarines [in Russian], Sudpromgiz, Leningrad (1948).
Additional information
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 1, pp. 25–30, January, 1975.
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Shor, A.M. Full-scale strength tests on penstock outlets of the Nurek hydroelectric station. Hydrotechnical Construction 9, 39–46 (1975). https://doi.org/10.1007/BF02379425
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DOI: https://doi.org/10.1007/BF02379425