January 2006

Rotating Equipment/Reliability

Troubleshooting repetitive failure of a CO2 ompressor rotor

Here's how the plant personnel overcame the unique and complex problem of residual magnetism

Agarwal, S., Bangar, V. K., Gupta, O. P., National Fertilizers Limited

National Fertilizers Limited (NFL) is the second largest fertilizer-producing company in India, with operating units at Bathinda, Nangal, Panipat and Vijaipur. The centrifugal CO2 compressors in all four streams of the urea plant are essentially identical except for differences in the driver turbines. The CO2 compressors in the old plant are driven by steam turbines using 42 ata steam. The new plant uses 105 ata steam for turbines. While high vibration in a compressor train is not uncommon, causes for such high vibration could range from simple to very complex. NFL Vijaipur also faced the problem of high vibration in the high-pressure (HP) stage (BCL stage) of its 31-stream CO2 compresso

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