Two Years’ Experience in Liquid Helium Transfer with a Maintenance Free Centrifugal Pump

  • H. Berndt
  • R. Doll
  • W. Wiedemann
Chapter
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 35)

Abstract

We report on two years of operating experience with low loss liquid helium transfer using cold gas exchange and a centrifugal immersion pump with magnetic bearings and a cold drive motor. Results of further pump developments are given. Depending on the blade height of rotor and guide wheel and rotational speed a wide range of flow rates to and pressure heads Ap with a hydraulic efficiency > 75% is reached. For example, depending on the values chosen for these parameters, one can get Δp = 0.5 bar at ṁ = 50 g/s (1440 L/h) or ṁ = 100 g/s at Δp = 0.2 bar. Just by adapting the blade height of rotor and guide wheel to a given load line the pump can always be operated in the region of maximum total efficiency. Shaft powers up to 40 W are possible.

Keywords

Helium 

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References

  1. 1.
    H. Berndt, R. Doll, U. Jahn and W. Wiedemann, Low loss liquid helium transfer system, using a high performance centrifugal pump and cold gas exchange, in: “Advances in Cryogenic Engineering,” Vol. 33, Plenum Publishing Corporation (1988), p. 1147CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • H. Berndt
  • R. Doll
  • W. Wiedemann

There are no affiliations available

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