The aim of this work is to reveal the failure mechanism of a supporting pipe weld after 20 years of service in a deaerization plant. The characterization methods included inductively coupled plasma, optical microscopy, scanning electron microscope, X-ray energy dispersive spectrometer, mechanical tests, and finite element analysis (FEA). The results showed that the supporting pipe weld failed by corrosion fatigue cracking. Cracks initiated from the surface pits which were due to corrosion. FEA analysis revealed that stress concentration occurred in the failed weld. This paper brings out the details of the investigation and suggests remedial measures to improve performance of such pipe welds in deaerization plants.
Corrosion fatigue Failure analysis Weld
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The authors gratefully acknowledge the financial support from the National High Technology Research and Development Program of China (Grant No. 2013AA031303), the Chinese National Engineering Research Center for Petroleum, and Natural Gas Tubular Goods and the Doctoral Innovation Fund of Xi’an University of Technology (Grant No. 207-002j1405).
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