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Pipe strings, as critical components in oil and gas industry, are highly susceptible to axial cracks for stress corrosion and fatigue damage. The conventional detection methods, such as magnetic flux leakage and magnetic particle inspection, are inadequate for accurately detecting a narrow axial crack. Alternating current field measurement (ACFM) technique is an electromagnetic inspection method capable...
The main objectives of this study were to introduce an integrated method for effectively identifying soil heavy metal pollution sources and apportioning their contributions, and apply it to a case study. The method combines the principal component analysis/absolute principal component scores (PCA/APCS) receptor model and geostatistics. The case study was conducted in an area of 31 km 2 in...
This article studies the application of the alternating current field measurement (ACFM) method in defect detection for underwater structures. Numerical model of the ACFM system is built for structure surface defect detection in seawater environment. Finite element simulation is performed to investigate rules and characteristics of the electromagnetic signal distribution in the defected area. In respect...
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