Search
Now showing items 1-10 of 15
Accidental Excitation of Acoustic Resonances from Balance Holes on Rotating Disk
(Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2021)
During commissioning of an open-casing test rig, a loud (above 105 dB) high pitch “squealing” sound occurred at speeds above 3,000 rpm. All elements of the rig were removed except the bearings yet the noise persisted. ...
Effect of swirl canceller on impeller exitation
(Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2021)
This case study is concerned with effect of the swirl canceller for impeller excitation force of integrally geared compressor. The 5th stage shaft vibration of booster air compressor showed abnormal behavior as the discharge ...
Investigation of a Compressor Coupling Failure by Torsional Excitation
(Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2021)
This case study examines a repeat compressor coupling failure that was a result of a complex, dynamic interaction of components that excited the 2nd torsional natural frequency of the train. The mature unit had operated ...
Aero-Derivat ive Gas Turbine Vibration Troubleshooting Comparing Traditional ODS and
(Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2021)
A large aero-derivative gas turbine in electrical generation service was exhibiting high vibration at the LP compressor section (1.5 in/s peak) at low load operation. Thorough testing, using Experimental Modal Analysis ...
Introduction of SCC life time estimation for fir tree design on steam turbine
(Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2021)
Some cracks due to stress corrosion cracking have detected in blade grooves of steam turbine. This presentation describes the residual life and its evaluate method for SCC on Fir tree blade groove.
Troubleshooting of Start Up for Old Steam Turbine
(Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2021)
During the start-up of an old steam turbine (about 30 years old), that was internally revamped, it was tripped due to high rotor vibrations. Site investigation was done to find out the root cause. Abnormal casing deformation ...
Reciprocating Compressor Crankshaft Fatigue Failure
(Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2021)
Determining the cause of a crankshaft failure which resulted in significant collateral damage within an Oxygen compressor safety barrier can be challenging despite having the industry recommended instrumentation. This case ...
Moto-Compressor coupling failure
(Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2021)
This case study will present the failure of the LS coupling of a variable speed moto compressor, due to a resonance of the first critical torsional speed while running at Minimum Operating Speed. The path followed for the ...
Cracking of the Cooling Water Manifold caused by Fluid Induced Instability of the Thrust Bearing in a Heavy-Duty Gas Turbine
(Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2021)
This case study presents the RCA of cracks in water cooling manifolds of a 300MW gas turbine. The cause of the failure was a natural frequency of the manifold excited by a self excited rotor axial vibration due to excessive ...
High Vibration of a Centrifugal Compressor Casing Caused by the Gas Leakage across a Damaged Gasket
(Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2021)
A sudden increase of casing vibration along with loud noise and shaking of casing and process piping were observed on a large sales gas centrifugal compressor, while the rotor vibration was below alarm level. When the unit ...