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Failure Analysis on a Ruptured Petrochemical Pipe

  • M. Harun , S. R. Shamsudin and A. Kamardin
Published/Copyright: May 5, 2013
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Practical Metallography
From the journal Practical Metallography Volume 47 Issue 8

Abstract

The failure took place on a welded elbow pipe which exhibited a catastrophic transverse rupture. The failure was located on the welding HAZ region, parallel to the welding path. Branching cracks were detected at the edge of the rupture area. Deposits of corrosion products were also spotted. The optical microscope analysis showed the presence of transgranular failures which were related to the stress corrosion cracking (SCC) and were predominantly caused by the welding residual stress. The significant difference in hardness between the welded area and the pipe confirmed the findings. Moreover, the failure was also caused by the low Mo content in the stainless steel pipe which was detected by means of spark emission spectrometer.

Kurzfassung

Der Schaden ereignete sich an einem geschweißten Rohrbogen, der einen katastrophalen Biegebruch aufwies. Er wurde in der Wärmeeinflusszone des Schweißbereichs und parallel zum Schweißweg ausgemacht. An der Kante der gebrochenen Fläche wurden Verzweigungsrisse ausgemacht. Ferner waren Ablagerungen von Korrosionsprodukten zu erkennen. Die lichtmikroskopische Analyse zeigte, dass transkristallines Versagen vorliegt, das mit der Spannungsrisskorrosion (SpRK) in Zusammenhang steht und hauptsächlich durch die Schweißeigenspannung verursacht wurde. Der erhebliche Härteunterschied zwischen dem geschweißten Bereich und dem Rohr bestätigte die Untersuchungsergebnisse. Hinzu kommt, dass das Versagen durch den geringen Gehalt an Mo im rostfreien Stahlrohr verursacht wurde. Dieser wurde anhand eines Funkenemissionsspektrometers ermittelt.

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Mohd Harun Dr. Mohd Harun is a well-known metallurgist in Malaysia. He worked as a senior research officer at Malaysian Nuclear Agency. Graduate from National University of Malaysia was getting his Master of Science from the University of Surrey and a PhD from National University of Malaysia – University of Oxford. Field of Research is in the field of Material Science/Metallurgy.

Shaiful Rizam Shamsudin Shaiful Rizam Shamsudin is a lecturer at the School of Materials Engineering, Universiti Malaysia Perlis. He was born in 1976. He received his bachelor degree and Master of Science in material science from National University of Malaysia in 1999 and 2004 respectively. His research interest is corrosion protection, failure analysis, magnesium alloy and metal casting.

References/Literatur

[1] Page, R. A.: TR 00–2. Gas Machinery Research Council. Dallas. (2000), 1–27Search in Google Scholar

[2] Port, R. D.;Herro, H. M.; McGraw-Hill. Kingsport Press. New York. 1991, 237Search in Google Scholar

[3] Guan, K. S.;Xu, X. D.;Zhang, Y. Y.;Wang, Z. W.: Engineering Failure Analysis. 12 (2005), 623–63310.1016/j.engfailanal.2004.05.008Search in Google Scholar

[4] Withers, P.J.; 2007. Reports on Progress in Physics. 70 (2007), 2211–226410.1088/0034-4885/70/12/R04Search in Google Scholar

Received: 2009-6-8
Accepted: 2010-3-16
Published Online: 2013-05-05
Published in Print: 2010-08-01

© 2010, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents/Inhalt
  2. Inhalt / Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Mechanical Properties of Ferrochrome Based Hardfacing Layers Coated on AISI 1020 Steel Obtained by the Aid of Plasma Transfer Arc (PTA) Process
  7. Influence of Welding Speed on Microstructure and Mechanical Properties of AZ31 Magnesium Alloy Laser Weldments
  8. Failure Analysis on a Ruptured Petrochemical Pipe
https://doi.org/10.3139/147.110065

Articles in the same Issue

  1. Contents/Inhalt
  2. Inhalt / Contents
  3. Editorial
  4. Editorial
  5. Technical Contributions/Fachbeiträge
  6. Mechanical Properties of Ferrochrome Based Hardfacing Layers Coated on AISI 1020 Steel Obtained by the Aid of Plasma Transfer Arc (PTA) Process
  7. Influence of Welding Speed on Microstructure and Mechanical Properties of AZ31 Magnesium Alloy Laser Weldments
  8. Failure Analysis on a Ruptured Petrochemical Pipe
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