This paper aims to develop a desirable detection method for bottom plate leakage, especially initial leakage, of oil tanks. For this purpose, a leak detection method was presented based on the oil and gas analysis. Meanwhile, the drilling, sealing and oil/gas collection methods were presented to overcome the lack of oil/gas collection hole at the bottom of in-service oil tanks. For better evaluation of detection results, the author developed a normalization method for the results detected at multiple holes and created comprehensive evaluation criteria for these results. The established model and evaluation algorithm were validated by applying them to an actual case and analysing the detection results.
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