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    Life tests of small turbine-type flowmeters in liquid hydrogen (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A total of 14 turbine-type flowmeters of 2.5- and 4-cm nominal size were operated for 100 or more hours at an average fluid speed in the unobstructed, upstream pipe of 20 m/s for the smaller meters and 9 m/s for the larger meters. Calibration shifts over a 6.1 range of calibration flow rates varied from 0.5 percent to 1 percent after 50 hr of operation. It is concluded that use of ball bearings with glass-filled Teflon retainers is most likely to produce minimal calibration shift with protracted use. Bearing replacement after 50 to 100 hr is recommended, depending on accuracy requirements, for meters used at the fluid speeds of the tests.
    Keywords: FLUID MECHANICS
    Type: NASA-TN-D-7323 , E-7371
    Format: application/pdf
    Location Call Number Expected Availability
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