Integral ultrasonic guide wave detecting method for barrel of pressure vessel

A technology for pressure vessels and ultrasonic guided waves, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves. Detection effect

Active Publication Date: 2012-08-15
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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  • Abstract
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Problems solved by technology

[0003] However, due to the large area of ​​the pressure vessel cylinder, traditional ultrasonic testing, thickness measurement and other testing methods are used in actual testing, which are all local testing. At the same time, due to the influence of the internal parts and structure of the vessel, it is impossible to achieve a comprehensive inspection of the vessel cylinder , it is easy to cause defects to be missed

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  • Integral ultrasonic guide wave detecting method for barrel of pressure vessel
  • Integral ultrasonic guide wave detecting method for barrel of pressure vessel
  • Integral ultrasonic guide wave detecting method for barrel of pressure vessel

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Embodiment

[0026] Embodiment: In the embodiment of the present invention, longitudinal ultrasonic guided wave testing is performed on a pressure vessel cylinder with a specification of Φ400×10mm and a material of 20R. The firstly calculated longitudinal guided wave phase velocity and group velocity dispersion diagrams are respectively Figure 4 , Figure 5 . Depend on Figure 5 It can be seen that when the frequency of the ultrasonic guided wave exceeds 70KHz, the group velocity of the guided wave of the mode corresponding to the A curve changes little, which facilitates the positioning of the echo. When the frequency exceeds 200KHz, guided waves of other modes will be generated. On the one hand, it will cause clutter, and on the other hand, it will also reduce the energy of the guided wave of the mode corresponding to the A curve, resulting in a decrease in the signal-to-noise ratio during detection. Therefore, the guided wave frequency is determined as 70KHz ~ 200KHz. Different inci...

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PUM

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Abstract

The invention relates to an integral ultrasonic guide wave detecting method for a barrel of a pressure vessel. The integral ultrasonic guide wave detecting method includes steps of 1, calculating a phase speed and group speed frequency dispersion chart of longitudinal or peripheral guided waves; 2, determining a range of detecting guide wave excitation frequency; 3, determining the best detecting guide wave frequency and a guide wave incident angle; 4, utilizing a common ultrasonic flaw detector and setting sound speed options of the ultrasonic flaw detector; and 5, correctly connecting a probe with the detector, placing the probe onto the barrel of the vessel to axially or peripherally scan, and utilizing reflecting echo of a weld joint of the barrel of the vessel to adjust sensitivity or processing an artificial reflector to determine the detection sensitivity according to defects required to be detected until detection is finished. The method can be used for efficiently and comprehensively detect the defects of the barrel of the pressure vessel.

Description

technical field [0001] The invention relates to a method for the overall ultrasonic guided wave detection of a pressure vessel cylinder. technical background [0002] As an important type of special equipment, pressure vessels are widely used in petroleum, electric power, chemical industry and other industries, and with the needs of social and economic development, their operating parameters are constantly improving, which has a greater impact on safe production. Defects such as cracks and corrosion may occur in all aspects of its manufacturing, installation, operation and maintenance. No matter which link the defect comes from, it will affect the safe use of the pressure vessel. Therefore, strengthening the inspection of pressure vessels, discovering and eliminating defects is of great significance to ensure their safe operation. [0003] However, due to the large area of ​​the pressure vessel cylinder, traditional ultrasonic testing, thickness measurement and other testin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07
Inventor 刘长福牛晓光郝晓军王志永王强
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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