Problems with turbine-driven compression units
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In a turbine-driven compressor unit, under normal operating conditions, in which direction is the axial force directed? Our shaft displacement probe reading is -0.17 mm. Can the direction of shaft displacement be determined from this reading?
The axial forces of compressors and turbines generally act from the high-pressure side toward the low-pressure side, right?
The displacement of -0.17mm you mentioned – how did you adjust the probe during installation?
In a turbine-driven compressor unit, under normal operation, the direction of the axial force is from the outlet to the inlet. Our shaft displacement probe reading is -0.17 mm; from this reading, only the magnitude of the shaft displacement can be determined, not its direction.
±It was probably determined by the instrumentation staff; just ask them and you’ll be able to find out
Why can’t the direction be determined? Generally, a negative value indicates moving away from the main pushing surface.
This value can give an approximate idea of the rotor’s position, provided you know the installation conditions of the instrument at that time
The direction issue can be determined; it can be found by looking at the side where the thrust plate is installed