Diaphragm coupling alignment tolerance
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Which value does the allowable deviation (axial) for the assembly of diaphragm couplings refer to in the \"General Specifications for the Construction and Acceptance of Mechanical Equipment Installation Projects\"? Is it the minimum value of the end-face clearance measured on the two axes, combined with the error in the actual size of the coupling?
Could you be more detailed? Is what you said the same as what I understand?
The deviation between the theoretical required value and the actual measured value of the distance between the two half-coupler end faces: in simple terms, if the distance is too small, it may be impossible to fit the diaphragm; if the distance is too large, the diaphragm is prone to coming apart during operation.
As for what you mentioned, \"is it the minimum value of the end-face clearance measured between the two axes and the error in the actual size of the coupling?\" ”You mentioned the minimum value of the end-face clearance; I guess you are wondering why, due to the inclination of the two axes, the values of the clearances at the two end faces differ vertically or horizontally. Your measured value can be the average of the upper and lower values.
Thank you very much for your answer. Is the distance between the two coupling ends the distance in the stationary state, or is it the distance measured when the couplings are in operation?
The ideal distance is one corresponding to the operating condition, but it’s difficult to determine this operating condition. Alignment can only be performed in a static state; therefore, whether it’s a compressor or a pump, should the rotor be placed at the required zero position before alignment (usually, this means pushing the rotor against the main and auxiliary thrust bearings to measure the axial displacement, and then moving it back half that distance)?