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Method for collecting magnetizable particles in an above ground storage tank

  • US 4,813,277 A
  • Filed: 02/19/1988
  • Issued: 03/21/1989
  • Est. Priority Date: 03/30/1987
  • Status: Expired due to Fees
First Claim
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1. A method for determining the presence of a leak in an above ground tank of liquid hydrocarbons having a lower specific gravity and a lower conductivity than water, said method comprising the steps of:

  • determining the level of water in said tank;

    collecting magnetizable particles in the liquid and water in the tank to prevent such magnetizable particles from fouling conductivity sensors utilized in sensing changes in the level of water in the tank;

    sensing changes in the level of water in the tank over time by sensing changes in conductivity at points along a line extending across an interface between the liquid hydrocarbons and the water in the tank; and

    ,determining the amount and rate of leakage relative to the capacity of the tank and the change in the level of the water in the tank over a selected time period.

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