Turbomachinery News

Machinery Repair Techniques for Late in Life Facilities

Innovative solutions are needed when challenges areise in aging equipment. Life expectancy, production impact and declining production needs to be taken into account in order to establish fit for purpose solutions. This can be achieved with some good engineering and unique repairs.

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Controlling Lube Oil Water Contamination

The following article looks at water contamination of the lube oil system for a turbine driven process blower. The water contamination occurred on multiple occasions which was severely damaging the machine. The article looks at water and moisture related issues on machinery and provides valuable tips on water contamination control steps, with improved solutions. The […]

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Centrifugal Compressor Hot Restarts – Rotor Thermal Bowing

When rotating equipment is restarted prior to reaching its thermal equilibrium (i.e. a Hot Restart) Rotor bow can occur. High radial vibrations for turbomachinery during a hot restart sequence are commonly caused by Thermal Rotor Bowing. A centrifugal compressor was tested under the hot restart conditions, with the results showing that the machine had the typical…

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Siemens to Provide Floating Power Plants to New York

Two SeaFloat power barges, equipped with eight Siemens SGT-A65 Gas Turbines are contracted to replace four existing power barges located at Gowanus Generating Station in the Upper Bay of Brooklyn, New York City.

A capacity of 300MW each, the plant’s power generating efficiency will see improvements in efficiency by nearly 50 percent, significantly reducing potential emissions of pollutants whilst still using existing gas infrastructure.

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Adapting Hermetically Sealed Compressor Technology to Deal with Sour and Corrosive Gases

The Oil & Gas industry faces increasing challenges to meet growing energy demands with the most sustainable exploration and production techniques. Compressor manufacturers have responded to these challenges with the development of hermetically sealed compressors, enabling gas compression with minimized environmental footprint. The main feature in all of these designs is integration of driver and driven unit into a single casing. As a result, there is no shaft protruding out of the casing, hence there is no need for shaft sealing elements like dry gas seals that have traditionally suffered poorest reliability.

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vortex breaker

Combatting Subsynchronous Shaft Vibration with Vortex Breakers

Subsynchronous shaft vibration was observed in an integrally geared expander-compressor when the machine was operated with a partial load in the course of plant start up. The root cause of the synchronous shaft vibration was identified, by means of CFD analysis, as the vortex flow which was generated in the downstream piping of the gas expander wheel.

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Preventing a Major Wreck on a New Reciprocating Compressor

During commissioning testing of three new reciprocating compressors a fault was detected requiring the testing to be stopped. Debris was found in the bearing resulting in minor damage due to the early indication from the monitoring system. This study highlights the failure data, the monitored parameters, damage found and corrective action taken. However, the key learnings for the site was the justification of the commissioning process, the utilization of the monitoring system, and paying close attention to the available data from the monitoring system.

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bent shaft

Understanding the Morton Effect – Case Study

At present, there are no commercially available codes in industry that have been found to be accurate, reliable and consistent enough to predict both the onset of the Morton Effect and a rotor’s response to the Morton Effect to be used as a design tool with hard acceptance criteria in the upfront design of turbomachinery. The available tools have however shown the ability to predict the proper trends associated with many changes made to help enhance machine stability when the Morton Effect is recognized. The Morton Effect refers to synchronous rotor instability due to non-uniform heating of shaft journals. The industry’s inability to reliably and consistently predict this phenomenon has caused both plant start-up delays and shutdowns due to machinery vibration. The multiple case studies that will be presented assess this problem and summarize the solutions that were developed, tested and ultimately implemented to address the Morton Effect.

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piston

Quantifying Piston Performance as a Standard When Evaluating Compressor Reliability and Efficiency

Piston slippage (blow-by) on reciprocating compressors is highly predictable due to defined leakage paths at the end gaps of piston rings. A new engineering approach quantifies the slippage through the piston rings and determines the dynamic pressure difference on each ring on the piston. With this approach the expected discharge gas temperature increase, expected capacity losses and the risks of rider bands activation due to piston ring slippage can be quantified. The piston design and ring styles can be iterated to find an optimized piston layout for a given application.

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stokes regimes

Simulation of Deposition in a Cooled High-Pressure Turbine Stage With Hot Streaks

Ash particle deposition in a high-pressure turbine stage was numerically investigated using steady Reynolds-averaged Navier-Stokes (RANS) and unsteady Reynolds-averaged Navie-Stokes (URANS) methods. An inlet temperature profile consisting of Gaussian nonuniformities (hot streaks) was imposed on the vanes, with vane cooling simulated using a constant vane wall temperature.

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