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LIQUID-HYDROGEN-FLOWMETER CALIBRATION FACILITY; PRELIMINARY CALIBRATIONS ON SOME HEAD-TYPE AND TURBINE-TYPE FLOWMETERS
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON D C
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Construction details, instrumentation, and operating techniques are described for a facility that will accept flowmeters up to 1.5-inch pipe size and that can maintain liquidhydrogen flow rates up to 1 pound per second for 3 minutes. The probable error of calibration is 14 of the flow rate for flow rates between 0.05 and 1 pound per second. Preliminary tests of an orifice plate and a nozzle indicate that the same correlation of discharge coefficient with Reynolds number applies for liquid hydrogen as for water. Preliminary tests of several commercially available turbine-type meters show that the calibration constant pulses per unit volume for liquid hydrogen will differ, on the average, about 1.0 from the value for water the difference is not of the same sign for different meters. Author
APPROVED FOR PUBLIC RELEASE