Storage tank overhaul period prediction method and device

Abstract

The embodiment of the invention provides a storage tank overhaul period prediction method and device, and the method comprises the steps of obtaining a passivation structure damage factor value corresponding to a target storage tank bottom plate, and obtaining the passivation structure damage time corresponding to the target storage tank bottom plate according to the passivation structure damage factor value and a damage time calculation formula; obtaining the initial thickness and the minimum allowable thickness of a bottom plate when the repaired target storage tank is re-put into use, and obtaining the bottom plate corrosion point growth time corresponding to the target storage tank according to the initial thickness, the minimum allowable thickness and a preset bottom plate corrosion growth time calculation formula; obtaining the overhaul period of the target storage tank according to the passivation structure damage time and the bottom plate corrosion point increase time. According to the invention, damage and pitting corrosion growth rules of a bottom plate passivation structure are considered, influences of current operation conditions such as the quality type of a storage medium, the medium temperature and the bottom falling frequency of a floating roof supporting column on the residual life are considered, consideration factors are more comprehensive, a prediction result is more practical, and a powerful support is provided for storage tank overhaul period prediction.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of safety evaluation, and in particular to a method and device for predicting a storage tank overhaul period. Background technique [0002] At present, my country's storage tank maintenance cycle generally follows the provisions of SY / T 5921-2010 "Repair Regulations for Vertical Cylindrical Steel Welded Crude Oil Storage Tanks". More than 10 years, the second and subsequent overhaul period is generally 5 to 7 years. In foreign standards, API 653 recommends that the inspection cycle be determined based on the service history of the tank and the measured corrosion rate. When the corrosion rate is unknown, the external inspection is once every 5 years and the internal inspection is once every 10 years; Under normal circumstances, the longest internal inspection interval cannot exceed 20 years; at the same time, it is recommended to adopt the RBI principle to improve the utilization rat...

AI Technical Summary

Problems solved by technology

The prediction of remaining life relies too much on historical detection data, assumes the corrosion rate as a constant value based on historical detection data, does not take into account the dynamic impact of changes in current operating conditions on the growth of corrosion points, and ignores the initiation and development of corrosion points It plays an important role in the prediction of remaining life, resulting in inaccurate prediction results

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