Compressor axial displacement zero position
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How is the zero position for the axial displacement of a centrifugal compressor determined? Thank you! !
There seems to be no strict regulations on this; each factory may have its own* practices. The key is for the instrument operators, equipment operators, and process operators to communicate well with one another.
Yes, because it is difficult to determine the exact amount that the rotor moves as it is pushed by the fitter, most factories use the thrust disc in close contact with either the main pushing surface or the auxiliary pushing surface as the zero point. However, some compressor manufacturers abroad have fixed requirements, stipulating that the zero position must be set at 1/2 of the total rotor length. For example, ELLIOTT
The API standards provide clear specifications for determining the zero position of shaft displacement, and most large design institutes follow these standards; therefore, the determination of the zero position is closely related to the subsequent determination of the shaft displacement interlocks. The median of the total stroke volume should be taken as the zero point for shaft displacement.
May I ask which API standard it falls under upstairs? Do you have it? It would be great to be able to upload it. Thank you! !
As for determining the zero position of shaft displacement, I believe it’s fine to set it at the middle position or when the rotor is in tight contact with the main drive shaft as the zero point