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Compensating for surface movement of liquid product within one or more liquid product tanks during capture of height and volume data

  • US 7,197,409 B2
  • Filed: 02/18/2005
  • Issued: 03/27/2007
  • Est. Priority Date: 01/14/2005
  • Status: Expired due to Fees
First Claim
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1. In a dynamic liquid product book to physical reconciliation system, a method of filtering physical volume measurements within a tank at a point in time by adjusting the effects of ripple on the surface of the liquid product caused by delivery of liquid product to the tank, dispensing of liquid product from the tank, or other ripple causes, the method comprising:

  • receiving a plurality of measurement data at a plurality of times to create a first set of measurement data, each measurement data representing a height of liquid product within a tank for calculating a volume of liquid product therein;

    comparing each of the plurality of measurement data in the first set of measurement data against at least one predetermined volume value identified as being unreliable;

    based on the comparison with the at least one predetermined volume value, generating a second set of measurement data by eliminating from said first set of measurement data any measurement data that is identified as being unreliable;

    determining a sample mean and a standard deviation for said second set of measurement data;

    filtering said second set of measurement data to generate a third set of measurement data by eliminating any measurement data from said second set of measurement data that has a value plus or minus a predetermined number of said standard deviations from said sample mean; and

    storing the third set of measurement data for analysis in determining an actual liquid product volume within the tank at a specific point in time, which is subsequently used for liquid product book to physical reconciliation at that specific point in time.

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