May 2017

Special Focus: Maintenance and Reliability

Root cause analysis on bearing failure on an induced draft fan

This case study aims to provide the root cause analysis behind bearing failure of an induced (ID) fan at a new refinery startup in 2015.

Allah, W. K., Saudi Aramco

This case study aims to provide the root cause analysis behind bearing failure of an induced (ID) fan at a new refinery startup in 2015. After taking vibration readings during several runs, the reliability failure was determined to originate from the non-drive end (NDE) pillow block bearing, which was a double row ball bearing. This examination will explain how bearing failure occurred during the regular run of the ID fan shown in FIG. 1. Due to the complicated nature of determining the causes of bearing failure, multiple parties were involved in the investigation. A total of four NDE bearings were damaged during the investigation process, which shed more light onto this equipment.

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