Abstract
Abstract The authors present results obtained with a modified type of International Standard Orifice as used for metering pump discharges. The annular slot for pressure measurement of the standard I.S.A. orifice is replaced in the modified orifice by a series of slots at the pipe wall and flush with the orifice plate. The results given in the paper include coefficients obtained with sharp-edged and rounded-edged orifices with various orifice-pipe diameter ratios and with various approach lengths of pipe. The coefficients obtained by the authors with the modified I.S.A. orifice are compared with coefficients of the standard I.S.A. orifice.
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