Sixteen centrifugal stages in two cases dri\'en by a Rolls Royce A VON jet and a single stal!e power tur bine compress natural gas of Mol Weight 2.1 from a pressure of 65 to 2000 psia. The rotating train, the coolers, the scrubbers and all svstems mounted on a double-deck platform weighing 20 0 tons is pumping gas in the Lake Maracaibo, Venezuela, since February 1<.>72. This paper deals with design concepts, protective ilevices, pre-testing of package simulating field conditions, and initial problems encountered during commissioninl! the unit.