Method for determining average wall thickness for pipes and tube

Details Method for determining average wall thickness for pipes and tube Method for determining average wall thickness for pipes and tube

1998-01-29

1999-10-19

Barlow, John

Data processing: measuring, calibrating, or testing

Measurement system

Dimensional determination

73584, 73620, 73627, 324220, G01N 2900

Patent

active

059704349

ABSTRACT:
A method for determining changes in the average wall thickness or the mean radius of a pipe or tube using ultrasonic and/or magnetostrictive wave probes by analyzing the dispersive behavior of waves traveling in the tube wall volume. The method examines certain wave propagation modes and identifies a cut-off frequency that is characteristic for a particular wall thickness or tube diameter. This method permits the rapid and accurate inspection of a length of pipe or tube from a single location on the inside diameter of the pipe and permits a comparison of data gathered with similar data for the structure in its original condition. Changes in the cut-off frequency, indirectly determined by the method of the present invention are inversely related to changes in the wall thickness and/or the mean radius for the cylindrical structure. In this manner the method of the present invention provides a mechanism for determining the remaining service life for such pipes and tubes.

REFERENCES:
patent: 4037465 (1977-07-01), Cook et al.
patent: 4265025 (1981-05-01), Finlayson et al.
patent: 4669310 (1987-06-01), Lester
patent: 4685334 (1987-08-01), Latimer
patent: 4909080 (1990-03-01), Kikuta et al.
patent: 5092176 (1992-03-01), Buttram et al.
patent: 5418823 (1995-05-01), Kervinen et al.

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