Rotating components of turboexpanders should be kept axially centered allowing for best efficiency through consistent clearance between the dynamic and static shroud line and increased reliability through non-contact between rotating and non-rotating components.
Since the rotating assembly is subjected to varying speed, varying mass flow and pressure loading, it becomes necessary to utilize a means to control thrust loading. The automatic thrust balancing system monitors the hydrodynamic oil pressure of each thrust bearing and when a pressure gradient exists, it triggers a rapid action balance valve that serves to adjust the compressor back wheel pressure to achieve equilibrium between front and back thrust bearings.
L.A. Turbine has developed an automatic thrust control system that has proven to be very reliable through years of service in challenging installations.