Method proposed for calibrating MFL, UT ILI tools

A new statistical method has been developed and successfully tested for calibrating magnetic-flux-leakage and ultrasonic in-line inspection tools from field verifications.In contrast to the methods so far available in the literature, the method proposed here can estimate the measurement errors of the ILI and field tools for both constant and nonconstant bias error-in-variables (EIV) models.The information required to identify the EIV model that describes the comparison of the ILI depth readings with the field measurements can be easily derived from the sizing accuracy claimed for the ILI and field tools. New ILI-tool rejecting criteria are proposed, and it is shown that to reject an ILI r...

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