Built-in type acoustic emission test method for corrosion of bottom plate of storage tank

Abstract

The invention relates to a built-in type acoustic emission test method for corrosion of a bottom plate of a storage tank. The method comprises the steps that a built-in type acoustic emission testing instrument is mounted, and a circle of acoustic emission sensors are uniformly distributed at equal altitudes in the positions close to the bottom plate of the outer wall of the storage tank; the built-in type acoustic emission testing instrument is started, a driving roller drives a polyethylene-aluminum composite pip to move downwards, sensor boxes move downward, and the vertical displacement of the acoustic emission sensors is determined according to the reading of a depth gauge; the horizontal positions and the sensitivity of the placed sensors are determined according to acoustic material property matrix test, and the test is started; after data are collected, a self-priming pump is started, a degreasing agent is sprayed, the sensor boxes are lifted by the aid of a coil trolley, and crude oil on the outer wall of the polyethylene-aluminum composite pipe is removed. According to built-in type acoustic emission test method for corrosion of the bottom plate of the storage tank, the acoustic emission sensors stretch into the storage tank and form an array with the sensors distributed on the outer wall of the storage tank and monitor the corrosion damage of the bottom plate of the storage tank jointly, and the corrosion damage of the bottom plate of the storage tank can be effectively evaluated.

Description

technical field [0001] The invention relates to a method for detecting storage tanks, in particular to a built-in acoustic emission detection method for storage tank bottom plate corrosion. Background technique [0002] The traditional acoustic emission tank floor detection technology is to couple the acoustic emission sensor to the tank wall to be inspected for passive listening, and then transmit the signal to the external acoustic emission instrument through the transmission cable for data processing by the host computer. Because the corrosion signal propagation path of the tank bottom plate passes through the crude oil to the tank wall, and then is received by the acoustic emission sensor, the signal is mixed with a lot of noise signals. At the same time, due to the relatively limited environment, the multipath effect also has a great impact on the received signal, so in this case, it is a great obstacle to accurately locate the corrosion area. Especially for the health...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a storage tank bottom plate corrosion acoustic emission detection method, which is used to solve the problem that the traditional acoustic emission tank bottom plate detection technology may have a weak acoustic emission signal in the center area and is easy to miss.

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