QUESTION
I have a damaged shaft which is part of a RBC system in a sewage treatment plant. But, this is shorter by 300 mm that I am requiring. My question is can I add a piece of 300 mm to the shaft (welded or mech. coupling), to complete the total required length? Or, is it dangerous necessitating a new shaft.
The shaft specs are:
- Material= carbon steel
- OD= 600
- thickness= 30mm
- actual Length= 6400mm
- final length including the 300mm=6700mm
- RPM=1-5
Attached you can see a draft of the shaft.
I am thinking of using a shaft coupling, or welding to join the 300 mm missing length (and of course do the recalculation of the stresses and deflection).
Question: Repair or replace?
REPLIES
dvd
- How does the 600 mm diameter relate to the 150mm diameter?
- Is this a turned down solid shaft, or a 600 mm round shell mounted on a 150 mm shaft?
- Is it a weldment or are shaft and shell mechanically coupled?
- 150 mm shaft diameter for a 6.4 m span does not seem good.
- Per ANSI/CEMA B105.1 Welded Steel Pulley Design, pulley shell strength should not be included in the shaft strength calculations.
- It is not clear the usage, design, loading or fabrication of this component, but it may not have been designed per industry standards.
SOURCE
https://www.eng-tips.com/viewthread.cfm?qid=434013
Above is a snippet.