Method and system for torsional wave inspection of heat exchanger tubes

A heat exchanger tube and torsional wave technology, applied in the field of inspection of heat exchanger tubes, can solve the problems of low efficiency, difficult mode control, poor defect detection ability, etc., and achieve the advantages of reducing interference, improving defect detection ability and reducing dispersion. Effect

Inactive Publication Date: 2007-01-17
SOUTHWEST RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The solutions disclosed in the prior art have not been widely accepted in the art for practical heat exchanger tube inspection

Method used

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  • Method and system for torsional wave inspection of heat exchanger tubes
  • Method and system for torsional wave inspection of heat exchanger tubes
  • Method and system for torsional wave inspection of heat exchanger tubes

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Embodiment Construction

[0020] go to figure 1 , figure 1 A functional block diagram of a system 100 for implementing the present invention is shown. The control processor 110 commands the function generator 130 to start a fixed frequency current pulse, which is amplified by the power amplifier 150 . The amplified current pulse 155 is sent to a magnetostrictive sensor 165 located on the probe 160 . The amplified current pulse 155 causes the magnetostrictive transducer 165 to generate a torsional wave pulse that is sent into a probe waveguide coupled to the heat exchanger tube. When the torsional wave encounters a defect in the heat exchanger tube wall, the reflected torsional wave signal is sent back to the waveguide coupled to the heat exchanger tube. The reflected signal generates a voltage signal in the magnetostrictive sensor 165 which is amplified by the preamplifier 140 . The amplified signal is then converted to a digital signal using an analog-to-digital converter 120 and sent to the contr...

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Abstract

The invention provides an improved method and device for inspecting heat exchanger tubes from within the tube inside diameter that overcomes the shortcomings of the prior art. It adapts a guided-wave probe approach that makes use of a torsional wave mode instead of a longitudinal wave node disclosed in the prior art. The torsional wave mode has many advantages over the longitudinal wave mode for detecting defects. When energized by suitable instrumentation, the probe is caused to generate a torsional mode signal that is transmitted to the heat exchanger tube from the waveguide tube. When reflected signals from defects in the heat exchanger tube walls are returned to the inspection opening end of the heat exchanger tube, the reflected defect signals are transmitted to the probe waveguide tube for amplification, detection and characterization of the reflected signal.

Description

[0001] This application claims priority to US Provisional Patent Application Serial No. 60 / 481,636, filed November 13, 2003, which is hereby incorporated by reference. technical field [0002] The present invention relates generally to methods and systems for inspecting heat exchanger tubes using long distance guided wave inspection techniques, and more particularly to methods for rapidly inspecting heat exchanger tubes from the inside diameter of the tubes using torsional guided waves. Background technique [0003] Heat exchangers are widely used in process plants, such as refineries, chemical plants, and power generation facilities, and typically include a large number of heat exchanger tubes supported in fixed positions by tube sheets. Each heat exchanger tube is accessible from one end for inspection and maintenance purposes. The heat exchanger tubes carry a first liquid or gas at a first temperature and are surrounded by a second liquid or gas at a second temperature, t...

Claims

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Application Information

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IPC IPC(8): G01N27/82G01M13/00G01M15/00F28F
CPCG01N27/82
Inventor 黑格恩·库詹姆斯·F·卡拉内金尚永
Owner SOUTHWEST RES INST
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