Abstract: The centrifugal compressor has a housing with two or more compressor inlets for process gas to be compressed; an impeller is located inside the housing so to receive an inlet flow of process gas from the two compressor inlets through a plenum chamber and increases gas pressure as process gas flows in the impeller thanks to the two or more inlets uniformity of flow at the inlets may be achieved through short collector pipes fluidly connected upstream of the inlets piping of a compressor system including such compressor is made easy as it is subject to fewer constraints.