January 2003

Rotating Equipment

Increase power and efficiency of LNG refrigeration compressor drivers

All-electric-driven plants can offer many benefits

Most main refrigerant compressors in LNG liquefaction plants are driven by frame-type gas turbines (GTs). At the high ambient temperatures prevailing at most LNG plant locations, the rated output power of GTs must be boosted by electric motors. These are the so-called helper drives, which at the same time serve as starter motors for the GTs. Newer installations also utilize the same helper drives - in power ratings up to 20 MW - in reverse operating mode as power generators in times when one of the GTs has excess power. As a logical consequence, major LNG plant operators and their contractors are looking into upsizing th

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