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Dramatic Vibration Improvement to Ring-Section Pump


This presentation, given at the 26th International Pump Users Symposium in 2010, describes how MSI used Operating Deflection Shape (ODS) Characterization to solve a vibration issue with a Ring-Section Pump. Using advanced troubleshooting techniques, MSI was able to recommend modifications to the baseplate that greatly reduced the vibration level.

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Simulation of the Francis-99 Hydro Turbine During Steady and Transient Operation


In this Institute of Physics Journal of Physics article, the authors compare analytical computational fluid dynamics (CFD) results to experimental results. Numerical predictions of the Francis-99 hydroturbine using the commercial CFD code STAR-CCM+ correlate well with experiment. Net head, discharge, runner torque and hydraulic efficiency all correlate closely with experimentally observed values. Nearly all quantities are predicted within 3.5% of the experimental observation.

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Nursing an Unreliable Boiler Feed Pump Back to Health


This Sound and Vibration article explains the benefit of modal evaluation while the machine is running, and provides a real world example of how MSI does it. An electric power generating plant located in the Northeastern U.S. had suffered through chronic boiler feed pump failures for eight years due to modulated-load operation. Rather than replacing the rotor element with a new, custom design, MSI got to the bottom of the real problem.

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Repetitive Shaft Crack Failure Analysis in a Nuclear Power Plant


Several attempts pursued by a plant and their supplier, over the years, did not find the root cause of a shaft cracking problem, in spite of the good troubleshooting procedures and careful installation practices pursued. Therefore, an exceptionally comprehensive root cause investigation was implemented, with specialty vibration testing at its core.

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How Plant Rotating Equipment Resonance Issues Can Affect Reliability and Uptime


Detecting the cause of machinery vibration can sometimes prove elusive. If you have had your switchgear fail due to exciter bolt tension, or have ever sought to diagnose high vibration levels that have appeared with no apparent cause, or come and go in seemingly random intervals, or have always exceeded their twin machine that is “the same,” you may have encountered resonance.

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Advanced Gas Foil Bearing Design for Supercritical CO₂ Power Cycles


As new commercial applications arise for supercritical CO₂ (sCO₂) power generation, and higher output and efficiencies are achieved through higher turbine inlet pressures and temperatures, the need to improve component technologies becomes essential. Traditionally lubricated and cooled oil bearings cannot tolerate the higher temperatures, and the higher pressures make keeping the oil separate from the working fluid an increasingly difficult challenge.

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A Specialized Testing Method to Resolve Problems in Gas Turbines


Aeroderivative gas turbines are used to drive LNG compressors. This article describes a problem solving process used to address a turbine problem that was introduced as part of a coupling retrofit. The specialized testing and analysis techniques are applicable to compressors, as well as other system components (heat exchangers, fractionation towers, etc.) used in LNG facilities…

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