Development of AE Monitoring Method for Corrosion Damage of the Bottom Plate in Oil Storage Tank on the Neutral Sand under Loading

Abstract

In Europe and USA, in-service diagnosis technique by AE method has already been used for evaluating the corrosion damage of bottom plate of oil storage tank. However, the diagnosis technique is dependent on the empirical method without physical bases such as the mechanism of AE generation due to the corrosion of bottom plates of oil storage tank. And also the relation between the corrosion rate and AE activity has not been clarified yet. This study was designed to clarify AE source and the relation between corrosion rate and AE activity during corrosion of bottom plate in oil storage tank, in particular, on the neutral sand bed. For modeling the corrosion condition which is similar to that of an inservice tank bottom on the neutral sand, the static stress of 382 MPa had been applied on the specimen plates. We investigated experimentally the relation between the corrosion rate and AE activity during the corrosion. Furthermore, the AE source and mechanism were examined based on the SEM observation of corroded surface. From these experimental results, the validity and physical basis for quantitative evaluation of corrosion rate by means of AE was presented.

Corrosion analysis and remaining useful life prediction for storage tank bottom

“…13 Park et al monitored the corrosion state and AE data of tank bottom in acidic soil and verified the consistency of the AE technology and risk-based method. 14,15 Zhang et al conducted an experiment on AE monitoring of tank bottom in a laboratory condition. He analyzed the emission signals collected in the experiment and obtained the AE characteristics during tank bottom corrosion process under different working conditions.…”

Steel Corrosion Stages Characterization Using Open-Ended Rectangular Waveguide Probe

“…Therefore, various nondestructive testing (NDT) methods [1], [2] have been attempted to characterise hidden corrosion or corrosion undercoating. For instance, fibre Bragg grating (FGB) [3] and acoustic emission (AE) methods [4] are sensitive to volumetric changes but require installation of equipment with extended period of data acquisition. An electrical impedance method such as electrochemical impedance spectroscopy (EIS) [5] can quickly measure the capacitance of coating and corrosion but requires complex data analysis for quantification and it is not suitable for in-situ inspection.…”

Cluster analysis of acoustic emission signals in pitting corrosion of low carbon steel

“…Acoustic emission sources of corroded metal and products deposit can be observed in uniform corrosion . Moreover, good correlations have been found between corrosion rate and acoustic emission activity(hits, events and amplitude), some empirical formulas to estimate corrosion severity are presented based on mass loss, polarization resistance measurements, electrochemical impedance spectroscopy (EIS) and hydrogen evolution rate in previous papers . As well, extracting and distinguishing the features of different acoustic emission sources can help to provide a reliable basis for acoustic emission on‐line tank floor inspection and evaluation .…”