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Method and system for filling cryogenic liquid containers

  • US 4,887,857 A
  • Filed: 01/05/1989
  • Issued: 12/19/1989
  • Est. Priority Date: 07/22/1986
  • Status: Expired due to Fees
First Claim
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1. A method for minimizing cryogenic substance loss in a filling station having a storage tank storing cryogenic substance for loading a container having an outlet vent with a throttle vent valve for adjusting the differential pressure between the substance being loaded and the container, comprising the steps of:

  • (a) first determining a value of filling loss for each of a plurality of values of differential pressure;

    (b) selecting and storing prior to loading an optimum value of differential pressure from the plurality of values to produce the minimum filling loss;

    (c) loading substance into a container;

    (d) continuously monitoring the differential pressure during loading;

    (e) comparing the monitored differential pressure to the optimum differential pressure;

    (f) adjusting the throttle vent valve to maintain the monitored differential pressure at a value substantially equal to the optimum differential pressure value;

    (g) selecting at least one new optimum value of differential pressure during loading of the container;

    (h) adjusting the throttle vent valve to bring the differential pressure to a value substantially equal to the new optimum differential pressure value during loading of the container; and

    (i) repeating steps (g) and (h) until the filling process is terminated.

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