Swedishrigpig
Marine/Ocean
I am inspecting an Oilfield Triplex piston Mud pump and the Pinion shaft has two Self Aligning Roller Bearings (1 ea end).
Approx. diam 460mm. Max clearance as per spec is 0,040-0,1092mm between housing and Bearing OD, I.E. no interference fit. Max Pinion speed 417 RPM
During testing it was noticed that the outer bearing has turned a few degrees in the housing. The manufacturer states that there is an allowance for the shaft to float slightly to allow temperature expansion etc. and this might allow the outer race to rotate a few degrees.
My question is this:
Is it ever acceptable for the outer race to move (rotate)?
Will the clearance allow the outer race to spin or is this a normal clearance?
Approx. diam 460mm. Max clearance as per spec is 0,040-0,1092mm between housing and Bearing OD, I.E. no interference fit. Max Pinion speed 417 RPM
During testing it was noticed that the outer bearing has turned a few degrees in the housing. The manufacturer states that there is an allowance for the shaft to float slightly to allow temperature expansion etc. and this might allow the outer race to rotate a few degrees.
My question is this:
Is it ever acceptable for the outer race to move (rotate)?
Will the clearance allow the outer race to spin or is this a normal clearance?