Compressor stations consist of the compressor and the components necessary for their operation.
The motor M, usually an electric motor, is connected to the compressor CP via the clutch CL. Compressor and motor are the compression unit, installed on a common foundation F. In a machine dynamic sense, that is in relation to variations in compressor speed, foundation stresses and vibrations, the compressor station has to be considered as a unit.
In a thermodynamic sense all working chambers WC of all stages, together with the corresponding interstage systems IS form a unit.
Besides the cooler CO and the connecting pipes CP the pulsation dampeners PD on both sides of the working chambers (to reduce gas pulsations), also the droplet separators DS to remove condensated humidity and entrained lubricating oil belong to the interstage system.
Normally a compressor station is fitted with a cooling water system CWS for the working chambers and for interstage cooling, also an oil system OS for the lubrication of the crank drive and the cylinders.
The control system CS regulates the start up and shut down procedures and controls the compressor according to changing working conditions. It also monitors the compressor station in order to avoid damage and to initiate repairs in dependence of the condition of its components.