Comparisons Between Throat and Pipe Wall Tap Nozzles

[+] Author and Article Information
J. S. Wyler, R. P. Benedict

Steam Turbine Division, Westinghouse Electric Corp., Lester, Pa.

J. Eng. Power 97(4), 569-573 (Oct 01, 1975) (5 pages) doi:10.1115/1.3446063 History: Received July 24, 1974; Online July 14, 2010


The history of pipe wall tap nozzles and throat tap nozzles, as to performance characteristics, is briefly reviewed. A series of tests was conducted on pipe wall tap and throat tap nozzle installations at three independent calibration laboratories. These results are presented, analyzed, and compared with existing rational, empirical, and nominal performance characteristics in the form of discharge coefficient versus the throat Reynolds number. On the basis of these results, a recommendation is made that both pipe wall tap and throat tap nozzle installations be considered as equally accurate for use in precision fluid metering work.

Copyright © 1975 by ASME
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