Reliability Improvements To A High Speed/High Energy Pump
The paper describes the problems encountered and solutions that were implemented to improve the reliability of a high speed/high energy centrifugal pump. Two of these pumps were originally installed in 1984, with a third installed in 1989 because of a unity expansion. The reliability of the pumps was improved in 1995 when the original stainless steel impeller and inducer were replaced with titanium, to raise the output shaft critical speed above the pump operating speed. However, the reliability problems y modifying the gearbox seal, the secondary sealing system, and the tilting pad bearing design on the output shaft. These improvements have lowered the shaft vibration and greatly improved the reliability of the pump and gearbox. A discussion of the rotordynamic analysis used to change the bearing design is included, along with the effects of the impeller/inducer material change. Likewise, how the improved secondary sealing system improved the synchronous vibration is also discussed.
Wilcox, Ed (2007). Reliability Improvements To A High Speed/High Energy Pump. Texas A&M University. Turbomachinery Laboratories. Available electronically from