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Ultrasonic detection method of scale thickness in pipeline

A detection method and ultrasonic technology, applied in the direction of using ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., can solve problems such as large damage, affecting the normal operation of equipment, and inability to effectively understand the scale of the inner wall of the pipeline.

Active Publication Date: 2011-09-14
常熟紫金知识产权服务有限公司
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Problems solved by technology

The scaling on the inner wall of the pipeline is mainly related to multiple factors such as the conveying medium, working environment, and service life. At present, the pipe cutting method is mainly used to understand the scaling in engineering. This method has a long construction period, great destructiveness, high cost, and serious Affects the normal operation of the equipment, and cannot effectively understand the scaling situation on the inner wall of the entire pipeline

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  • Ultrasonic detection method of scale thickness in pipeline
  • Ultrasonic detection method of scale thickness in pipeline
  • Ultrasonic detection method of scale thickness in pipeline

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Embodiment Construction

[0051] The present invention will be further described in detail below in combination with specific embodiments.

[0052] The concrete implementation method of the present invention is as follows:

[0053] (1) Use standard test block for zero point calibration

[0054] In actual testing, the ultrasonic wave has a propagation path in the probe, which will affect the accuracy of scale thickness measurement. Therefore, in order to improve the detection accuracy, we use standard test blocks for zero point calibration.

[0055] Select a standard test block with known sound velocity and known thickness to facilitate the determination of the propagation time required for ultrasonic waves to penetrate straight through the standard test block and obliquely penetrate in different paths; then calculate the total penetration time and corresponding The difference between the ultrasonic propagation time in the test block under the detection mode is the propagation time of the ultrasonic w...

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Abstract

The invention discloses an ultrasonic detection method of scale thickness in a pipeline. The method comprises the following steps of: utilizing double incidences of ultrasonic waves at different angles, establishing simultaneous equations on the basis of propagation velocities of the known ultrasonic wave on the pipe wall and in the filled fluid and the relationship between an incident angle and a refraction angle of the ultrasonic wave by measuring the penetration time of the ultrasonic waves in the pipeline filled with fluid during the double incidences, and further calculating the velocity and the thickness of a scale layer in the pipeline. With the method, the scale thickness can be measured under the condition that the scale characteristic is unknown, the working detection of the pipeline can be achieved, and the method has reliable accuracy and no destructive effect.

Description

technical field [0001] The invention relates to an ultrasonic detection method for the thickness of a scale layer in a pipeline, belonging to the field of non-destructive detection. Background technique [0002] In petrochemical, metallurgy, thermal power and many other industries, scaling problems are common in various equipment and pipelines. The scale layer will reduce the flow area of ​​the pipeline, increase the transmission resistance, and even cause blockage in the part with severe scaling; in some heat exchange systems, due to the small thermal conductivity of the scale, the scale layer will reduce the heat transfer speed of the heating surface, resulting in The abnormal rise in temperature will destroy the mechanical strength of the pipeline, greatly shorten the service life of the pipeline, and even cause a pipe burst accident. [0003] In order to prevent accidents and reduce energy consumption, it is necessary to pickle and descale the pipeline in time. This re...

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Application Information

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IPC IPC(8): G01B17/02
Inventor 朱援祥陈芸王伟国
Owner 常熟紫金知识产权服务有限公司
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