May I ask the experts about the actual clearance of the mouth ring in cantilever centrifugal pumps?
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May I ask the experts how to actually measure the clearance of the mouth ring in cantilever centrifugal pumps? How to center a mouth ring when it’s severely worn!
For greater accuracy, use an inner diameter dial indicator; if the wear is severe, a new collar must be replaced. Alignment is determined mainly by checking the pump shaft and the motor shaft
Hello! This one is for measuring circular runout and total clearance! I’m talking about how to measure the actual alignment and coaxiality after assembly
It is the coaxiality between the pump body ring and the impeller ring
Circular runout and total clearance are enough! You mean the mouth ring has uneven wear, right? ! If the pump cover flange is free from corrosion or damage, its coaxiality has been ensured during manufacturing at the time of leaving the factory.
Mm! Because the mouth ring has been eroded, it’s a bit abrasive when worn now! The worn area has been treated with red lead powder, but I need to know the actual one-sided clearance! Is there any expert who knows a good way to measure it!
Use calipers to measure the impeller and pump cover separately. Coaxiality is determined by the shoulder for positioning.
This measurement will be a bit more complicated; if there’s no issue with the pump cover shoulder, it can be used as a reference. Measure data in 4 or even more directions at the impeller collar and pump cover shoulder to determine concentricity. Measure again the deviation in concentricity between the shell mouth ring and the pump cover shoulder. This is really hard to do; the accuracy can vary a lot! ! If that doesn’t work, increase the gap slightly; the pump efficiency will be a bit lower.
Thank you! That’s how I do it… It’s so troublesome; the only solution is to increase the gap