Title page for etd-0224116-155842


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URN etd-0224116-155842
Author You-Ren Chen
Author's Email Address No Public.
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Department Mechanical and Electro-Mechanical Engineering
Year 2015
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Quantitative Evaluation of Defects on Supports of Pipeline Using Magnetostrictive EMAT
Date of Defense 2016-01-28
Page Count 164
Keyword
  • Simple support
  • Clamp support
  • SH0 mode
  • Magnetostrictive EMAT
  • Circumferential welding support
  • Longitudinal welding support
  • Pipeline systems
  • Abstract Nowadays, pipeline systems has been extensively used in energy, petrochemical and even the livelihood industries to transport raw materials or products rapidly and safely. However, the recent report shows that industrial issues due to failure of the pipes rupture became the main sources of economic losses in factory. The interfaces between the supports and pipe are prime locations for corrosion to occur, as the interfaces can trap water or contaminants and are inherently difficult to inspect as the corrosion is often hidden by the support interface. Also, because the variety types of pipe support, there has no method can generally apply on every cases currently, and the inspections most rely on manual visual to assess.
    Among the non-destructive testing techniques, guided waves has the ability to detect the section where pipe support mounted, precluding the restrictions caused by in-situ condition. According to previous researches, the common long-range guided wave is strongly affected by pipe support, which made these area be a dead zone. This study provides simple support, clamp support, circumferential welding and longitudinal welding support as samples to evaluate the inspecting efficiency of SH0 mode magnetostrictive EMAT(Electromagnetive Acoustic Transducer), which can only be utilized in certain range. It shows this middle-range high frequency guide wave can successfully separate defect signal and significant reflection of supports. Also, by comparing original reflection signal of supports, we discovered the differences of reflection characteristics when the welding points after adding artificial defects, and obtained less than 10% depth quantitative error of these artificial defects created in pipe support region. It can be observed the SH0 middle-range high frequency guide wave technique not only won’t affected by clamp support, but also has good ability to detect the defect in the interior of the circumferential welding support. The results obtained from this study can be a reference or information for companies in practical use and further developed a standard procedure for inspecting pipeline support region.
    Advisory Committee
  • Bor-Tsuen Wang - chair
  • S. Y. Hsia - co-chair
  • Jyin-Wen Cheng - co-chair
  • Jin-Jhy Jeng - co-chair
  • Yang, Shiuh-Kuang - advisor
  • Files
  • etd-0224116-155842.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2016-03-24

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