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Growing Science » Engineering Solid Mechanics » Failure analysis of geothermal API 5L grade B steel pipeline

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Engineering Solid Mechanics

ISSN 2291-8752 (Online) - ISSN 2291-8744 (Print)
Quarterly Publication
Volume 13 Issue 3 pp. 259-266 , 2025

Failure analysis of geothermal API 5L grade B steel pipeline Pages 259-266 Right click to download the paper Download PDF

Authors: J. Obiko, M. Ndeto, J. Mutua, B. Shongwe, N. Malatjia, M. Bodunrin, D. Klenam

DOI: 10.5267/j.esm.2025.5.001

Keywords: Geothermal, Steam pipeline, Failure mechanism, Erosion-corrosion

Abstract: This article reports on the failure analysis of the geothermal steam pipe. Macro and micro examination of failed pipelines was studied using optical and scanning electron microscopy. The energy-dispersive spectroscopy studied the elemental composition of the corroded surface. Further, the study measured the pipe thickness on the failed pipeline section. Visual examination showed a significant thinning of the outer section of the failed pipe to 3 mm from 12.7 mm of the original pipe. The chemical composition results show that the steel meets the minimum requirements for API 5L Grade B steels used in steam pipelines for geothermal power plants. The microstructural analysis of the investigated steel shows that the steel had pearlite and ferrite phases. The steel failure mechanism was due to erosion-corrosion, which caused localised wall thinning near the drain port and elbow section. The study recommends creep-resistant steel for the drain port and elbow for geothermal power plant application.

How to cite this paper
Obiko, J., Ndeto, M., Mutua, J., Shongwe, B., Malatjia, N., Bodunrin, M & Klenam, D. (2025). Failure analysis of geothermal API 5L grade B steel pipeline.Engineering Solid Mechanics, 13(3), 259-266.

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Journal: Engineering Solid Mechanics | Year: 2025 | Volume: 13 | Issue: 3 | Views: 232 | Reviews: 0

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