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Journal of KWJS 2008;26(4):85-91.
Published online September 24, 2008.
ERW강관에서 홈부식의 가속화에 미치는 유동의 영향에 관한 연구
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Study on the Effects of Flows on the Acceleration of the Grooving Corrosion in the ERW Pipe
Jae-Seong Kim, Yong Kim, Bo-Young Lee
Abstract
  The grooving corrosion is caused mainly by the different microstructures between the matrix and weld which is formed during the rapid heating and cooling cycle in welding. By this localized corrosion reaction of pipes, it evolves economic problems such as the early damage of industrial facilities and pipe lines of apartment, and water pollution. So lots of researches were carried out already about grooving corrosion mechanism of ERW carbon steel pipe but there is seldom study for water hammer happened by fluid phenomenon and corrosion rate by flow velocity. In this study, the analysis based on hydrodynamic and fracture mechanics was carried out. ANSYS, FLUENT and STAR-CD were used for confirmation of flow phenomenon and stress on the pipe. As the results, fatigue failure is able to be happened by water hammer and grooving corrosion rate is increased cause by turbulent. Grooving corrosion is happened on the pipe, then friction loss of fluid is occurred from corroded part. Erosion can be happened enough in corroded region of microscopic size that wear “V” form. Also pipe is able to be damaged by water hammer effects because of corroded region is general acting as a notch effects. Corrosion depth was more than half of total thickness, it can be damaged from water hammer pressure.
Key Words: ERW, Grooving corrosion, erosion, carbon steel pipe, Water hammer, Turbulent, Laminar


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