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Now showing items 41-50 of 1627
Improving Reliability On A Centrifugal Compressor Experiencing Frequent Bearing Failures
(Texas A&M University. Turbomachinery Laboratories, 2012)
A 1957 vintage multi-stage centrifugal compressor, critical in a refrigeration process, had a history of poor reliability and LP stage bearing failures. Around 1995 the HP casing had been replaced and upgraded. In early ...
Design And Retrofit Of A Low Solidity Diffuser For A Pipeline Centrifugal Gas Compressor Application.
(Texas A&M University. Turbomachinery Laboratories, 1997)
A high efficiency, single-stage pipeline centrifugal gas
compressor, originally designed with a wedge-type vaned diffuser,
was retrofitted with a vaneless diffuser along with two low solidity
diffuser configurations in ...
Application Of A Heat Barrier Sleeve To Prevent Synchronous Rotor Instability.
(Texas A&M University. Turbomachinery Laboratories, 1998)
This paper explains how synchronous rotor instability can occur
in high speed turbomachinery due to differential heating of bearing
journals. Theoretical investigations have indicated that rotors
supported by fluid-film ...
Turbine Instability Solution-Honeycomb Seals.
(Texas A&M University. Turbomachinery Laboratories, 1996)
A 40,000 hp steam turbine-generator in a utility service experienced a history of high vibration alarms and trips from an online vibration monitoring system. The excursions of high vibration restricted the operational load ...
The Design, Application, And Operation Of High Efficiency Turboexpanders In Process Plants.
(Texas A&M University. Turbomachinery Laboratories, 1996)
Turboexpander thermal efficiency is an important parameter in the process design of hydrogen purification plants. When a process requires low flow and high head, expander thermal efficiency can only be improved by increasing ...
Vibration Reduction Or Large Steam Turbine Generator Through Bearing Analysis/Modification.
(Texas A&M University. Turbomachinery Laboratories, 1997)
Large utility steam turbines have experienced very high vibration levels on their generator exciter bearings. Units where the exciter rotor is supported by a single bearing are particularly susceptible. This synchronous ...
Discovering, The Hard Way, How A High Performance Coupling Influenced The Critical Speeds And Bearing Loading Of An Overhung Radial Compressor - A Case History.
(Texas A&M University. Turbomachinery Laboratories, 1997)
A case is presented where significant unacceptable vibration levels were encountered during mechanical testing of a single stage overhung radial compressor used in a mechanical vapor recompression process. The contract ...
High Speed Oil-Free Turbomachinery String.
(Texas A&M University. Turbomachinery Laboratories, 1998)
This paper is a discussion of the design, manufacture, test, and
field operation of a totally oil-free string of rotating equipment. The
turbomachinery string consists of a multistage centrifugal
compressor driven by a ...
Vibration And Eccentricity Measurements Combined With Rotordynamic Analyses On A Six Bearing Turbine Generator.
(Texas A&M University. Turbomachinery Laboratories, 1998)
This lecture discusses how the vibration characteristics and
eccentricity measurements were combined with rotordynamic
analyses to help improve the reliability of a turbine generator unit.
It also explains certain ...
Mechanical Upgrades To Improve Centrifugal Compressor Operation And Reliability.
(Texas A&M University. Turbomachinery Laboratories, 2003)
In today’s business environment, centrifugal compressor reliability is more critical than ever. Unscheduled equipment downtime has a negative impact on plant operations, oftentimes resulting in a temporary halt of production. ...