Patent ID: 6772637
Filing Date: 2004-08-10
Classification: G01M,G01N

Abstract:
A method for in-tube flaw detection in a pipeline, comprising:passing inside the pipeline an inspection pig carrying transducers responsive to at least one pipeline diagnostic parameter, the transducers alternately emitting probing pulses and receiving reflected pulses corresponding to the probing pulses, the emitting of probing pulses occurring at a pulse repetition period; reading data from said transducers, and processing and storing the data measured by said transducers, determining periodically during the passing a travel speed of the inspection pig with a period of determining the travel speed that is greater than the pulse repetition period; and varying during the passing the pulse repetition period as a function of the determined value of the pig travel speed and as a function of at least one value of the pig travel speed determined for the passing for a selected preceding lapse of time.