A deformation monitoring method for storage tanks with external floating roofs

Abstract

The invention relates to a deformation monitoring method for an external floating cover storage tank group. The method includes setting a plurality of reference points; measuring coordinates of each reference point and establishing a standard coordinator system; arranging measurement points on each external floating cover storage tank and measuring the coordinates of each measurement point; setting a control point on each external floating cover storage tank; measuring relative positions of the reference points and the measurement points at the control points; scanning the inner wall, a floating top and a scanning marker set of each external floating cover storage tank and obtaining scanning point cloud data of each external floating cover storage tank; performing coordinates conversion and converting the coordinates of the scanning data to data in the standard coordinate system, and performing data treatment respectively for obtaining the deformation condition of each external floating cover storage tank. According to the invention, by setting the reference points in an area away from the storage tank group, the coordinates obtained through three-dimensional laser scanning are converted into standard coordinates of the reference point, so that geometric deformation indicators of each storage tank in the external floating cover storage tank group can be obtained comprehensively in real time and continuous and accurate monitoring on geometric deformation condition of the external floating cover storage tank group can be realized.

Description

technical field [0001] The invention relates to the technical field of storage tank safety management and measurement, in particular to a deformation monitoring method for a group of external floating roof storage tanks. Background technique [0002] Large storage tanks have the advantages of saving steel, occupying less land, saving investment, and being easy to operate and manage. Developed countries have built and used large-scale storage tanks for nearly 30 years. With the needs of production and the implementation of my country's strategic oil reserve plan, large-scale storage tanks have also developed rapidly in China in recent years. The outer floating roof storage tank is a common form of large storage tanks. The evaporation loss of the stored oil is small, and the self-weight of the tank roof is supported by the storage liquid to make it evenly stressed, so large storage tanks mostly use this form. If the wall panels of the outer floating roof storage tanks are not...

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Problems solved by technology

The optical reference method requires the use of optical plummets, horizontal rulers, mobile magnetic rulers, etc., but this method based on single-point measurement will cause large measurement errors when the deformation of the tank wall is complex

The photoelectric method generally uses total stations and GPS to measure the deformation of storage tanks. This method is still a single-point measurement, that is, only point observations can be used to obtain deformation data of fewer observation points to infer the overall deformation, and it is impossible to obtain local and The overall accurate deformation details, and the installation of the equipment on site is difficult, and the measurement time is relatively long, so the requirements for the stability of the environment are very high, and its measurement accuracy and stability are often greatly affected, so the detection efficiency and accuracy cannot be effectively obtained. Guarantee, unable to meet actual production needs

[0004] In addition, for the external floating roof storage tank group with multiple storage tanks placed in one area, through the above method for detection or monitoring, many geometric parameters need to be measured, the operation is complicated, the labor intensity of personnel is high, and the measurement process is affected by human factors. The impact is relatively large, and the error is large when measuring a tank with large deformation; during the measurement process, the oxygen content in the tank is insufficient, toxic, harmful, and corrosive media will cause certain harm to personal safety

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