June 2014, Vol. 241, No. 6
Features
Modern VSD Double-Casings Centrifugal Compressors For Gas Pipelines
Modern centrifugal compressors using double-end, variable-speed electric motors are high performance and reliable options for pipeline compression stations. Such a compressor train is equipped with two compressor casings coupled through two gear units on either side of a double-end variable speed drive (VSD) motor. Alternatively, a high-speed VSD electric-motor can be used without any gear unit or just one gear unit for the high-pressure casing. A unit of this type can easily compress a large volume of gas from relatively low pressure to pressure above 100 Barg (for modern high-pressure pipelines, which can transfer gas to long distances), using a single train of two compressor

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