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http://dx.doi.org/10.9725/kstle.2017.33.2.37

Abnormal High-Temperature Behavior Troubleshooting of Process Compressor Tilting Pad Journal Bearing  

Lee, An Sung (Dept. of System Dynamics Research, Korea Institute of Machinery and Materials)
Lee, Woonsil (Engineering Team, Hyundai Oilbank Co.)
Choi, Dong-Hoon (Dept. of Mechanical Engineering, Hanyang Univ.)
Publication Information
Tribology and Lubricants / v.33, no.2, 2017 , pp. 37-44 More about this Journal
Abstract
A DE-side LBP tilting pad journal bearing of a 1-stage overhung heat-pump compressor in a propylene process exhibited abnormal high-temperature behavior. Its temperature had been relatively high at $78^{\circ}C$ from the beginning of operation. In 2014, after three years of operation, it increased suddenly and reached $103^{\circ}C$. Installing a varnish removal equipment and others managed to stabilize the temperature at $95^{\circ}C$. We undertook a troubleshooting approach for reviewing the comprehensive status and integrity of the temperature design of the bearing. We performed lubrication and heat-balance analysis, based on the design engineering data and documents supplied by the OEM. For the base design data of DE-side TPJB, evaluating the effects of key design variables on bearing metal temperature showed that firstly, increasing the bearing clearance and supply oil flow-rate, and next, changing the oil type, and finally, increasing the machined pad clearance and offset, are more effective in reducing the bearing metal temperature. Furthermore, a clarification meeting with the OEM revealed that an incorrect decision had been made to decrease the bearing clearance to eliminate the SSV harshness issue, while not maintaining a sufficient oil flow-rate. We conducted a detailed retrofit design analysis, wherein we increased the oil flow-rate and bearing clearance by decreasing the preload. We predicted that the bearing temperature would decrease to $63^{\circ}C$ from $75.7^{\circ}C$ even at the rerate condition. Finally, after installing and operating a retrofit replacement bearing in 2015, the bearing temperature stabilized at a low temperature of $65^{\circ}C$. Currently (January. 2017), two year later, the bearing metal temperature remains at $65^{\circ}C$. Therefore, we can conclude that the abnormal high-temperature behavior of the bearing has been resolved completely.
Keywords
process compressor; tilting pad journal bearing; abnormal high-temperature; troubleshooting; design approach;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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