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High Frequency Acoustic Excitation in Centrifugal Compressor and Adjacent Piping Vibration
(Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2021)
In a centrifugal compressor, interactions between impeller blades and stationary parts such as diffuser vanes will generate high frequency pressure pulsations. The frequencies of these pulsations, so called “blade passing ...
Stability Analysis of a Multi-stage Gas Compressor With Swirl-brakes Using Three Dimensional Transient CFD Model
(Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2021)
Minimizing fluid induced forces through the secondary leakage flow paths in shrouded centrifugal impellers is crucial to improve the rotordynamic stability of high-pressure centrifugal gas compressors. Swirl brakes (SBs) ...
Cavitation Performance Improvement of an Industrial Cryogenic Centrifugal Pump by Implementing Variable Pitch Inducer
(Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2021)
Cavitation performance improvement of an industrial cryogenic pump is studied in this paper. A variable pitch helical inducer is designed and implemented to the existing pump assembly to enhance the cavitation performance ...
Modern Methods to Detect Degradation in Centrifugal Compressor Performance and Use of Thermodynamic Performance Modelling to Identify Causes
(Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2021)
Detecting degradation in centrifugal compressor thermodynamic performance can be challenging. Machines can operate at different inlet and discharge conditions, different inlet guide vane positions, different speeds and ...
CALCULATING SHAFT COUPLING MISALIGNMENT FORCES IN FLEXIBLE COUPLINGS
(Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2021)
The goal for this tutorial is to show a screening method to determine if shaft misalignment forces, moments and directions are significant with common misalignments. This tutorial paper provides information to calculate the ...
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 ...
An End User's Guide to Centrifugal Pump Rotordynamics
(Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2021)
This tutorial outlines the basics of pump rotordynamics in a form that is intended to be Machinery End User friendly. Key concepts will be defined in understandable terms, and analysis and testing options will be presented ...
Site Performance Testing of Centrifugal Compressors and Gas Turbine Drivers
(Turbomachinery Laboratory, Texas A&M Engineering Experiment Station, 2021)
While factory performance tests for compressors and gas turbines are well defined in ASME power test codes, and can be performed under well controlled conditions, site performance tests must be performed under the conditions ...
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 ...