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The design, physical set-up and operation with National Instrument’s Labview of the crawler will be described, along with the data analysis procedure in Mathworks Matlab and Quest Integrity’s Life Quest reformer software, typical results and reports.
The eddy current probes can also detect cracking along the brittle chromium carbide phases.A tube crawler has been developed to quantify the carburization in 25%Cr-35%Ni alloy tubes used in furnaces for ethylene production.Eddy current probes are used to detect the increase in magnetic permeability associated with chromium depletion in the alloy matrix.The FEA incorporates plastic and creep material properties.Mechanical testing of ex-service HP 50 alloy has been undertaken to improve a material property data-base for carburised material.