With the aim of measuring flow through pipes of large diameter, a “streamlined pitot-tube bar” was devised. Basic studies, both theoretical and experimental, were carried out in a preliminary way on the cross-sectional form of the bar in order to obtain the best results. Based on the sectional form finally selected, a full-size model was prepared and tested, from which the pitot coefficient and other pertinent data were obtained. Two actual pitottube bars of 60 mm chord and 2 m length were constructed and used in measuring the flow in the main pipe of the pump installed at the Numazawanuma storage system hydroelectric station.

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