Abstract: An apparatus for adjusting an axial thrust force acting on a rotor of an integrally geared compressor (IGC) is provided. In the present disclosure, the axial thrust force acting on the rotor of the IGC may be adjusted in two opposite directions by tandem seals having different effective sealing diameters, and a thrust force generated in compressors located at both sides of a gear may be effectively offset. Furthermore, since a thrust load acting on the rotor of the IGC is offset, an operating pressure level at which the IGC operates may be increased.

Abstract: An industrial system for compressing a waste gas product, such as CO2, including a compressor train having an upstream rotor portion and a downstream rotor portion arranged in flow series with said upstream portion. Each rotor portion includes one or more compressor stages and said downstream portion is arranged to rotate at a variable relative speed to that of the upstream rotor portion. Sensing equipment for the compressor train is arranged to determine one or more flow conditions and a controller is arranged to receive data indicative of said one or more sensed flow conditions. The controller is arranged to set the rotational speed of the upstream rotor portion based upon the pressure or flow rate of gas upstream of said compressor train and to set operational parameters for said downstream portion so as to maintain a desired surge margin for said upstream rotor portion.