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METHOD AND APPARATUS FOR MEASURING WALL THICKNESS, OVALITY OF TUBULAR MATERIALS

  • US 20080071496A1
  • Filed: 09/21/2007
  • Published: 03/20/2008
  • Est. Priority Date: 03/02/2005
  • Status: Abandoned Application
First Claim
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1. A method for measuring the maximum and minimum diameter and ovality of a tubular comprising:

  • calculating the circumference of the tubular;

    calculating the mean radius of a circle having the measured circumference;

    contacting the surface of the tubular at two points in a plane substantially perpendicular to the major axis of the tubular;

    measuring the distance from the surface of the tubular at a point half way between the two points of contact to the ultrasound transducer at a known distance from a line connecting the two points of contact;

    using the mean radius to calculate the theoretical pipe center and circumference;

    calculating the arc height of the tubular by adding or subtracting the water path measurement to a fixed distance defined by the fixture;

    calculating the maximum and minimum diameters of the pipe relative to the theoretical mean radius and center;

    calculate the ovality of the tubular by calculating the difference between the maximum and minimum diameters per revolution; and

    correlating ovality and wall thickness simultaneously using essentially the same apparatus and ultrasonic probe.

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