Deformation detection method of storage tank with external floating roof

Abstract

The invention relates to a deformation detecting method for an external floating cover storage tank. The method includes S1, measuring the coordinates of a reference point outside the external floating cover storage tank and establishing a standard coordinator system; S2, arranging scanning points on the upper part of a floating cover and the bottom of the storage tank; S3, measuring positions of the reference point and the external scanning points relative to a control point; S4, using a three-dimensional laser scanner to scan the inner wall, the floating cover and a bottom board of the storage tank and obtaining scanning data; S6, calculating the coordinates of the external scanning points in the standard coordinate system; S7, converting the coordinates of the scanning data into the standard coordinate system and performing data treatment and obtaining the deformation condition of the external floating cover storage tank. According to the invention, through the reference point outside the external floating cover storage tank, arranging the control point on the top part of the storage tank and converting the coordinates of the storage tank obtained through three-dimensional laser scanning into standard coordinates of the reference point through the control point, continuous accurate detection on integral geometric deformation safety condition of the external floating cover storage tank 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 detection method for a large external floating roof storage tank. Background technique [0002] Large storage tanks are one of the commonly used equipment in petrochemical and pipeline enterprises, and belong to the category of atmospheric pressure vessels and thin-walled structures. The outer floating roof storage tank is a common form of large storage tanks. It is characterized by low evaporation loss of stored oil, and the self-weight of the tank roof is supported by the storage liquid, making it evenly stressed. Therefore, large storage tanks often use this type of storage tank. form. However, compared with other forms of storage tanks, the disadvantage of floating roof storage tanks is also obvious, that is, it is prone to geometric deformation, which will affect safe production in severe cases. [0003] The geometric de...

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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

CN104296668 A discloses an external measurement method for the settlement of the storage tank foundation. The method uses a total station to measure the height of the coordinates of the foundation point of the storage tank to complete the measurement of the coordinates of the settlement point, which still belongs to the single-point measurement and does not establish a corresponding deformation judgment index

In addition, the existing technology needs to measure many geometric parameters, the operation is complicated, the labor intensity of personnel is high, and the measurement process is greatly affected by human factors, and the error is relatively large when measuring a tank with large deformation

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