In June, 1950, errors in operation and malfunctioning of equipment resulted in water-hammer surges which burst one 9-ft-diam penstock of the three-unit 68,200-kw Oigawa Power Station in Japan. The accident resulted in the death of three workmen and about one half million dollars in damage to equipment and powerhouse. This paper reviews the events leading to the penstock failure and the resulting damage.

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