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Method and apparatus for checking the tightness of a tank-venting system

  • US 5,460,141 A
  • Filed: 05/20/1994
  • Issued: 10/24/1995
  • Est. Priority Date: 05/27/1993
  • Status: Expired due to Fees
First Claim
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1. A method for checking the tightness of a tank-venting system when a pregiven test condition is satisfied, the method comprising the steps of:

  • (a) building up difference pressure in said tank-venting system irrespective of whether said pregiven test condition is satisfied;

    (b) determining the presence of said test condition and then closing said tank-venting system;

    (c) determining the value of the decay gradient of said difference pressure when said pregiven test condition is satisfied thereby losing no time in starting the check of said tightness; and

    ,(d) drawing a conclusion as to the tightness of said tank-venting system when said value of said decay gradient is less in magnitude than a threshold decay gradient.

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