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Failure Analysis Of A Lube Oil Carbon Steel Pipe

A carbon steel pipe with an internal diameter of25 mm and a wall thickness of 3mm was connected to a turbine support and used to transport Lube oil (grade 32) to the turbine bearing at a power plant. During operation, the pipe was subjected to mechanical vibration giving rise to alternating stresses. The pipe was fractured after 166,701 hours of service. The pipe carried a working pressure of 1 Bar and was operated at a temperature of 50-55°C. The objective of this study was to determine the most probable cause offailure of the lube oil pipe and provide proper recommendations for preventive measures.