| Today’s society, the spherical tank is used in almost every industry. However, steel spherical tank will be affected by various factors in the process of long-term use resulting in a variety of types of damage is inevitable. As a result, an increasing number of experts and engineering technical personnel at home and abroad focus on the analysis of the steel spherical tank design and safety use.In order to ensure the long-term safety of spherical tank and effective service, it needs regular inspection and maintenance, compared to the conventional NDT methods (ultrasonic testing, magnetic particle testing, etc.), the acoustic emission detection technology has the following features:no need to stop production testing, low cost, small labor intensity, not sensitive to component geometry, high sensitivity to material, is a kind of online, dynamic, Large pressure vessel can take advantage of the acoustic emission technology to the overall detection, as long as the correct cloth on a sufficient number of sensors, can measure the determine the location of defects.The pressure vessels in service projects, generally under cyclic loading, if work in corrosion environment, the defect degree of mastery and control is particularly important. The tank bottom is easy to cause defects, leakage and corrosion. These defects can produce acoustic emission signal effectively, thus by acoustic emission instrument, based on the research object, the tank bottom, according to the data detected by acoustic emission signal analysis of corrosion and leakage location and status, to facilitate further for spherical tank acoustic emission testing technology research.Secondly, the formula of Paris is described, and the corrosion fatigue residual life of the commonly used 07MnNiCrMoVR steel is estimated in corrosion fatigue effect of corrosive medium of H2S. The residual life of tank is estimated by fitting the relation curves of residual life, crack length and crack length and crack growth rate. |
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