Data processing: measuring – calibrating – or testing – Measurement system – Dimensional determination
Reexamination Certificate
2007-06-12
2007-06-12
Nghiem, Michael (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system
Dimensional determination
C702S171000
Reexamination Certificate
active
11367031
ABSTRACT:
The wall thickness and ovality of a tubular are simultaneously determined. The theoretical radius of a pipe is computed from a measurement of its circumference. An ultrasonic device conventionally used to measure the wall thickness of tubulars is adapted to also measure the maximum and minimum diameters and ovality by equipping or utilizing existing ultrasound inspection device with contact surfaces which contact the tubular at a fixed distance apart and at a known distance from the surface of the ultrasonic transducer. The contact surfaces define a chord of known length on the tubular under test. The mean radius of the tubular may be computed from multiple water path measurements around the circumference relative to a known fixture. The maximum and minimum diameter and ovality are calculated from the measured differences in distance from the surface of the tubular to the ultrasonic transducer and the theoretical circle. Wall thickness and ovality may be correlated relative to position by using the same apparatus for both measurements.
REFERENCES:
patent: 6272762 (2001-08-01), Kinast et al.
patent: 6568096 (2003-05-01), Svitkin et al.
D. Moore; “Design Considerations in Multiprobe Roundness Measurement;” J. Phys. E: Sci. Instrum. 22 (1989) 339-343. Printed in the UK.
Cherry Stephen J.
Cudd Pressure Control, Inc.
Nghiem Michael
Wong Cabello Lutsch Rutherford & Brucculeri LLP
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