Case Studies
Advanced Analysis & Problem Solving
Process Modeling
A leading Power Provider was evaluating the performance of their compressed air energy storage train, which had been plagued by acoustic resonance in the discharge piping of an intermediate stage of compression. A field performance test was conducted to determine if there was an aerodynamic instability in the compressor, or whether one of the intermediate stages of compression was experiencing surge.
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Vibration Analysis
The motor and gearbox for the was replaced in early 2020. The cold alignment was performed during cold ambient temperatures < 40°F. In March of 2020, the compressor train shaft vibrations began to increase. Vibration levels continued to increase with operation but had not reached alarm or trip levels. A thermal growth study was requested to determine the potential impact that improper hot alignment may have on the unit.
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Steam Turbine Analysis
Fertilizer manufacturer with a double controlled-extraction steam turbine, requested assistance with a condenser vacuum leak. The vacuum leak was contributing to a loss of system performance. “Hogging jets” were required in service to maintain proper vacuum in the surface condenser. During site visit, it was discovered that LP extraction was operating at less than design pressure. Several leak locations were detected, and later sealed with industrial sealant. Customer wanted to determine impact of LP extraction operating at pressure lower than design.
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Rotor Dynamics Analysis
An offshore oil and gas platform had been experiencing unpredictable vibration issues with two of their turbine-driven high pressure gas compressors. The compressors are identical in design, but both exhibited unpredictable elevations in vibration over time. Gas analysis shows minimal changes over time, suggesting that the compressors are not surging due to Molecular weight changes of the gas.
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