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Method for detecting guide waves of steel storage tank bottom plate

A technology of storage tank bottom plate and detection method, applied in the field of ultrasonic measurement and piping system

Inactive Publication Date: 2010-06-30
PETROCHINA CO LTD
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  • Application Information

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After searching the relevant domestic patents, no patents identical or similar to this patent application were found

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  • Method for detecting guide waves of steel storage tank bottom plate
  • Method for detecting guide waves of steel storage tank bottom plate
  • Method for detecting guide waves of steel storage tank bottom plate

Examples

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Embodiment Construction

[0042] Embodiment. This example is in Fangshan-5000m 3 Methods of testing on crude oil storage tanks. The tank is a vault tank, with a fixed tank roof 1 on the tank wall 2 with an outer diameter of 24m and a height of 11m, a storage tank bottom plate 3 with an outer diameter of 26m and a thickness of 20mm, and a laminated section 10, and a storage tank bottom plate 3 Down is wet sand 9, and oil storage 11 is arranged in the tank (see image 3 ).

[0043] First select 4 suitable ultrasonic probe arrays 5, distribute the probe arrays 5 symmetrically along the storage tank bottom plate 3, and clean or derust the surface of the storage tank bottom plate 3 where the probe arrays 5 need to be placed, so as to enhance the detection effect. Leave enough space for probe array 5 and wedge installation (see figure 2 ).

[0044]Piezoelectric ceramic sensors are used as transducers, and two transducers are installed in each module, which are respectively used to excite and receive guid...

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Abstract

The invention relates to a method for detecting guide waves of a steel storage tank bottom plate, comprising the following steps in sequence; (1) selecting the number of ultrasonic probe arrays (5), and symmetrically distributing the ultrasonic probe arrays (5) along the steel storage tank bottom plate (3); (2) arranging two signal processing devices (4) on each ultrasound probe array (5), and arranging the ultrasound probe array (5) on the steel storage tank bottom plate (3) through a wedge block in a coupling way; (3) selecting a ultrasonic wave length which corresponds to the thickness of the steel storage tank bottom plate (3) and selecting a method for exciting Lamb waves; (4) transforming a travel time matrix with Radon algorithmic function to generate Lamb wave travel time projections of different incidence angles, which are used as the projection data for the subsequent tomography reconstruction; (5) reconstructing a tomography in the projection data with the filtered back projection algorithm; (6) analyzing the tomography to find the position of the defect and grade the defect level; and (7) if the defect existing, changing the positions of ultrasonic probes clockwise, repeating the steps (1), (2), (3), (4), (5) and (6), comparing the repeated detection and tomography reconstruction results, and eliminating the effect of noise and other factors if the position of the defect and the morphology existing.

Description

technical field [0001] The invention relates to a guided wave online detection method for the bottom plate of a steel storage tank. The field of measurement and piping technology involving ultrasound. Background technique [0002] At present, foreign countries mainly start with the structural inspection of the bottom plate of the storage tank, and realize the safety management of the storage tank in combination with the tank cleaning and external inspection. In contrast, at present in China, the method of clearing tanks is still used to conduct comprehensive floor inspections on large tanks on a regular basis. Through the analysis of a large number of inspection results, this method cannot achieve economical and efficient storage tank integrity management. With the current rapid development of science and technology, the detection of storage tanks has also changed from offline to online, and the detection of defects in in-service storage tanks can be realized by using flat-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/06
Inventor 王维斌佟文强刘桂春王禹钦刘哲王琨郭正虹任重
Owner PETROCHINA CO LTD
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