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A Review of Aerodynamically Induced Forces Acting on Centrifugal Compressors, and Resulting Vibration Characteristics of Rotors
(Texas A&M University. Turbomachinery Laboratories, 2008)
There are several sources of nonsynchronous forced vibration of centrifugal compressor rotors. Many of them are aerodynamic phenomena, created within the gas path of the compressor. Phenomena such as impeller stall, diffuser ...
Vibrations in High Pressure Centrifugal Compressors of Offshore Platforms
(Texas A&M University. Turbomachinery Laboratories, 2008)
During the startup of one of the compression trains of an offshore platform, in August/2006, excessively high vibrations were observed at the high pressure compressor. The same problem was also verified one week later, ...
Dry Screw Compressor Performance And Application Range.
(Texas A&M University. Turbomachinery Laboratories, 2009)
Screw compressors have the advantage of low mechanical vibration levels similar to those found in centrifugal compressors due their rotary motion. However, screw compressors are positive displacement machines with a working ...
Turbine Overspeed Systems And Required Response Times.
(Texas A&M University. Turbomachinery Laboratories, 2009)
Turbine overspeed events lead to the most dangerous and costly of catastrophic turbine failures. Traditionally, overspeed protection systems were designed and provided by the original equipment manufacturers (OEMs) - few ...
Torsional-Lateral Coupled Vibration Of Centrifugal Compressor System At Interharmonic Frequencies Related To Control Loop Frequencies In Voltage Source Inverter.
(Texas A&M University. Turbomachinery Laboratories, 2009)
Centrifugal compressor train in a refinery experienced high vibration problem due to torsional resonance. Sidebands in the VFD output current based on VFD control loop frequencies were identified as the root cause. In this ...
Steam Turbine Pipe Strain Case Study.
(Texas A&M University. Turbomachinery Laboratories, 2009)
This is a case study of a new steam turbine installation in which pipe strain became an issue after commissioning and start-up. This case study will bring light to the use of shaft indicator movement vs. turbine casing ...
Repeated Failures On Second Stage Impeller Linked To Blade Natural Frequency Excitation.
(Texas A&M University. Turbomachinery Laboratories, 2009)
Temperature Considerations For Trouble-Free Oil-Free Screw Operation.
(Texas A&M University. Turbomachinery Laboratories, 2009)
Centrifugal Impeller Failure via a Thermite Reaction
(Texas A&M University. Turbomachinery Laboratories, 2007)
A 2500 HP integral gear compressor in an air separation plant experienced an impeller failure in the first stage of compression. The failure was extensive and took the dry air compressor off-line. Plant production was ...
Advances In Gas Turbine Couplings.
(Texas A&M University. Turbomachinery Laboratories, 2007)
Over the last 50 years industrial gas turbines have advanced significantly. Horsepower has increased 200 percent (and even higher) within the same envelope. Improvements in efficiencies and reliability (more operating time ...