Acoustic Emission Based Tank Bottom Floor Corrosion Detection
Tao Zhang, Hao Feng, and Zhou-Mo Zeng
State Key Laboratory of Precision Measurement Technology and Instrument, Tianjin University, 92 Weijin Road, Nankai District, Tianjin, P.R.China
The tank bottom floor is a crucial component of large oil storage tanks, and its status has a pivotal impact on the integrity of the entire tank. Acoustic Emission (AE) monitoring is an advanced, in-service, nondestructive testing method internationally recognized to be capable of assessing the tank bottom floor without the necessity of prior tank cleaning. In this paper, the principle of Time Difference of Arrival (TDOA) is illustrated, and the efficiency of piezoelectric AE sensors is verified through a field experiment. The authors then investigate Mach-Zehnder interferometerbased AE sensors with a view to using optical fiber sensors as a substitute for acoustic emission detecting. The results of the experiment indicate that optical fiber AE sensors based on the Mach-Zehnder interferometer can be used as transducers sensitive to acoustic events, so they can serve as indicators of the imminent failure of a structure. In addition, some suggestions are put forward regarding forthcoming actual application.
-  S. Liying and L. Yibo, “Review of on-line defects detection technique for above ground Storage Tank floor monitoring,” 2010 8th World Congress on Intelligent Control and Automation, WCICA 2010, 4178-4181.
-  “Columbus, Nondestructive Testing Handbook,” second edition: Vol.6, Acoustic Emission Testing, American Society for Nondestructive, 2005.
-  C. U. Grosse and M. Ohtsu, “AE Signal Parameters,” Acoustic Emission Testing, Springer, Berlin, 2008.
-  G. Lackner, “ACOUSTIC EMISSION TESTING (AT) ON FLAT BOTTOMED STORAGE TANKS: HOW TOCONDENSE ACQUIRED DATA TO A RELIABLE STATEMENT REGARDING FLOOR CONDITION,” European Conf. on Acoustic Emission Testing, pp. 1-8, 2002.