Meilinda, Nurbanasari and T. S., Purwanto and R. S., Piliang and Tarsisius, Kristyadi and Encu, Saefudin and Yusril, Irwan (2019) Leakage on Water Cooling Distribution Pipe in a Hydroelectric Power Plant. Journal of Failure Analysis and Prevention, 18 (3). ISSN ISSN 1547-7029

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Abstract

This paper reported the investigation of leakage occurred on the water cooling distribution pipe in a 175 MW hydroelectric power plant. The pipe has been used around 2 years. The pipe has a function to flow through the cooling water from penstock to the heat exchanger. The leakage of the pipe caused the system was shut down and impacted on economic losses. Nondestructive, chemical, mechanical and metallography tests were carried out in this investigation. Based on chemical composition, hardness and microstructure analysis confirmed that the pipe was made of low-carbon steel and met with the standard of ASTM A595 grade A, which is suitable for water pipeline. Nondestructive inspection found that the surface of inner wall of the pipe experienced erosion– corrosion and from metallography analysis, it is strongly evidenced that the leakage occurred on the base metal due to the severe erosion–corrosion at the localized area. The severe erosion–corrosion occurred was induced by the elbow of the pipe and the excessive root penetration causing flow turbulence and continuing to progressive wall thinning of the pipe.

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