Item Details

Life Tests of Small Turbine-Type Flowmeters in Liquid Hydrogen

by Howard F. Hobart, Herbert L. Minkin, and Isidore Warshawsky
Format
Book; Government Document; Online; EBook
Published
Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1973.
Language
English
Series
NASA Technical Note
Summary
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.
Description
15 p. : ill. ; 27 cm.
Mode of access: Internet.
Notes
  • Prepared at Lewis Research Center.
  • Cover title.
  • Bibliography: p. 8-9.
Series Statement
NASA technical note ; NASA TN D-7323
Logo for No Copyright - United StatesNo Copyright - United States
Technical Details

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    a| Life tests of small turbine-type flowmeters in liquid hydrogen c| by Howard F. Hobart, Herbert L. Minkin, and Isidore Warshawsky.
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    a| Washington, D.C. : b| National Aeronautics and Space Administration ; a| [Springfield, Va. : b| For sale by the National Technical Information Service], c| 1973.
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    a| 15 p. : b| ill. ; c| 27 cm.
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    a| NASA technical note ; v| NASA TN D-7323
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    a| Prepared at Lewis Research Center.
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    a| Cover title.
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    a| Bibliography: p. 8-9.
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    a| 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.
    538
      
      
    a| Mode of access: Internet.
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    a| Liquid hydrogen.
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    a| Turbines.
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    a| Flow meters x| Calibration.
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    a| Flow meters x| Testing.
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    a| Warshawsky, Isidore.
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    a| Minkin, Herbert L.
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    a| United States. b| National Aeronautics and Space Administration.
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    a| Lewis Research Center.
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