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Method and apparatus for detecting a blockage in a vapor flow line

  • US 4,072,934 A
  • Filed: 01/19/1977
  • Issued: 02/07/1978
  • Est. Priority Date: 01/19/1977
  • Status: Expired due to Term
First Claim
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1. A method for detecting blockage in a vapor flow line adapted to communicate vapor from a container adapted to hold a variable amount of fluid to a point remote from the container, said method comprising the steps of:

  • obtaining a first signal representative of the pressure in the vapor flow line;

    producing a second signal representative of the rate of change with time of said first signal; and

    detecting if the frequency of the variations in said second signal exceeds a first preset limit to detect a blockage in the vapor flow line.

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