On the rotor positioning issue in horizontal split (fire pump) designs
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For horizontal split-type fire pump units, with deep groove ball bearings on both sides, how to adjust the rotational series value
Is this one of those first-stage double-suction impellers? The double-suction impeller balances the axial force; since there are no thrust bearings on either side, there should be no balance disk, right? Can you send a structure diagram?
I forgot to take a photo at the time; now they don’t allow phones on site
That’s right, it’s a double-suction impeller; but to ensure the pump’s efficiency during installation, isn’t alignment also necessary, along with adjusting the clearance?
The rotor has not been replaced, its size has not changed, and its positioning will not shift.
The axial side clearance of the impeller should be within the allowable range; whether it is exactly equal has little impact on the pump’s efficiency.
There are radial bearings on both sides, so there is no possibility of adjusting the axial displacement. A double-suction impeller balances the axial force.