Design And Experience With A 30,000 HP Magnetic Bearing Supported Motor Driven Turbocompressor For A Speed Range Of 600 To 6300 Rpm.
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In the Northern Netherlands, after more than 30 years of production, the pressure of the gigantic Groningen onshore gas field is gradually decreasing, requiring up to 500 MW compression over the next 30 years to fulfil capacity obligations. Within a unique technical and contractual concept, up to 29 electric motor driven centrifugal compressors with 120 bar (1741 psi) discharge pressure will be installed to maintain the necessary input pressure for the Dutch pipeline network. Based on a thorough total cost of ownership evaluation, and considering the extended project duration and its special requirements, a future-oriented compression string was devised and installed in 1998, serving as the prototype for the remaining installations. Performance, design, and construction features of this oil-free turbocompressor string are described, highlighting the rotordynamic aspects of the supercritical rotating string with its extremely wide continuous operating speed range. The design aspects of the magnetic bearings are emphasized. Test results and initial field experience are addressed. Lessons learned and a recommendation for the API Standards Committee conclude the paper.
Kummlee, Horst; de Groot, Wim H.; Lenderink, Gerrit M.; Shultz, Richard R. (2000). Design And Experience With A 30,000 HP Magnetic Bearing Supported Motor Driven Turbocompressor For A Speed Range Of 600 To 6300 Rpm.. Texas A&M University. Turbomachinery Laboratories. Available electronically from