Abstract
Theoretical value of pressure rise in a penstock of hydro-electric power station, where a surge tank is equipped, has been obtained. The surge tank of which the author has made a study of a riser pipe and surge tank body as shown in Fig. 1. The author has introduced an approximate formula for the max. pressure rise. Also the effect of draft-tube upon the pressure rise has been studied. Observed values of pressure rise at Hiraoka power-station, Tenryu River, have been compared with those obtained by calculation from author's formula, and it was found that both agree fairly well, at least in the sense of practical use.
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