During full load shop tests under natural gas, two multistage centrifugal compressors exhibited subsynchronous vibrations. Both of them are low flow, high pressure, high rotational speed compressors, and are fitted with tilting pad bearings, and dry gas seals. A rotating stall problem was firstly eliminated by a modification of the diffuser geometry. Then, aerodynamic excitations caused the rotors to operate at their stability limit, and high vibration levels were observed at the first natural frequency. A complete rotordynamics analysis was performed in order to model precisely all the fluid-structure interactions. Modifications of the rotor designs were implemented, consisting in optimizing conveniently the bearing pads, replacing the toothed labyrinth seals of the balance pistons by damping honeycomb seals, fitting them with improved shunt hole systems. In addition, the dry gas seals were found to have been damaged, due to thermal effects, and further modifications were implemented to eliminate this problem. Final full load tests demonstrated a satisfactory behaviour of both centrifugal compressors.
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ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition
June 10–13, 1996
Birmingham, UK
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-7876-7
PROCEEDINGS PAPER
Experience in Full Load Testing Natural Gas Centrifugal Compressors for Rotordynamics Improvements
Alain Gelin,
Alain Gelin
Framatome Division Thermodyn, Le Creusot, France
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Jean-Marc Pugnet,
Jean-Marc Pugnet
Framatome Division Thermodyn, Le Creusot, France
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Daniel Bolusset,
Daniel Bolusset
Framatome Division Thermodyn, Le Creusot, France
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Patrick Friez
Patrick Friez
Framatome Division Thermodyn, Le Creusot, France
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Alain Gelin
Framatome Division Thermodyn, Le Creusot, France
Jean-Marc Pugnet
Framatome Division Thermodyn, Le Creusot, France
Daniel Bolusset
Framatome Division Thermodyn, Le Creusot, France
Patrick Friez
Framatome Division Thermodyn, Le Creusot, France
Paper No:
96-GT-378, V005T14A041; 11 pages
Published Online:
February 6, 2015
Citation
Gelin, A, Pugnet, J, Bolusset, D, & Friez, P. "Experience in Full Load Testing Natural Gas Centrifugal Compressors for Rotordynamics Improvements." Proceedings of the ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; General. Birmingham, UK. June 10–13, 1996. V005T14A041. ASME. https://doi.org/10.1115/96-GT-378
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