November 2000

Rotating Equipment

Optimize gas turbine-driven centrifugal compressors

'Designed engineering' increases output by 100 - 500 kW

Saxena, M. N., Global Machinery Consultants Pty Ltd.

At locations and plant sites where steam is not available, dual-shaft gas turbines are often used as drivers. These turbines have the ability to meet process variations by allowing the power turbine to operate at the speed dictated by system resistance curve. However, gas turbine limitations must be considered or output losses ranging from 100 kW (for a small compressor duty of 1 MW) to 500 kW (for larger duties of 15 MW and above) may result. Gas turbines from 1,000 kW to 30,000 kW have been used as drivers for centrifugal compressors mainly in offshore and remote area applications. Two-shaft gas turbines have two separate rotors - the air compressor (also commonly referred to as gas prod

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