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Fundamental examination of AE corrosion detection in oil storage tank floors

机译：储油罐底板AE腐蚀检测的基础检查

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Periodic mandatory inspection with the inspection interval ranging from 8 to 10 years is stipulated for Japanese large-scale crude oil storage tanks regardless of corrosion damage induced to the tanks. Tanks with small operational periods are usually free from any corrosion damage. Thus, opinions are raised for developing an inspection technology to be applied to such tanks without making any access to the inside surfaces of the tanks with utilizing acoustic emission (AE) related technology. Precise study has been scarcely reported so far on the generation mechanism of the AE for assessing corrosion incidents of oil storage tanks. The present investigation has demonstrated acoustic emission from steel test specimens subjected to various corrosion rates in two kinds of accelerated corrosion tests registering the frequency at about 30 kHz. One of the accelerating corrosion tests is immersing test specimens in oxygenated aqueous solutions of 3.5 percent NaCl, and the other is to pass electric current in the test specimens while immersed in the test solutions. Furthermore, the propagation behavior of elastic waves in a mock-up tank of a diameter of 5 m and actual storage tanks has been discussed. Signal processing based on the wavelet analyses is conducted for improving S/N ratios, which shows wavelet analysis is effective in discriminating the AE signals from the noises. Some measuring test results of actual oil storage tanks are reporting with a comparison with AE measuring test results of corrosive tank after useless for long-period, and with discussion of noise features collaborated with such as wind.
机译：对于日本大型原油储罐，规定定期检查的检查间隔为8到10年，而不考虑对储油罐造成的腐蚀损害。运行周期短的储罐通常没有任何腐蚀损坏。因此，对于开发将应用于这种储罐的检查技术提出了意见，而该技术不利用任何与声发射（AE）相关的技术进入储罐的内表面。迄今为止，几乎没有关于用于评估储油罐腐蚀事件的AE发生机理的精确研究的报道。本研究表明，在两种加速腐蚀试验中，钢试样的声发射受到各种腐蚀速率的影响，记录的频率约为30 kHz。加速腐蚀试验之一是将试样浸入3.5％NaCl的含氧水溶液中，另一种是在浸入试样溶液的同时使试样中通过电流。此外，还讨论了弹性波在直径为5 m的模拟储罐和实际储罐中的传播行为。进行基于小波分析的信号处理以提高信噪比，这表明小波分析可有效地将AE信号与噪声区分开。报告了一些实际储油罐的测量测试结果，并与长期无用后的腐蚀罐的AE测量结果进行了比较，并讨论了与风等噪声特性的讨论。

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