Shaft fracture analysis of this pump
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As shown in the picture: A vertical pipeline pump has an impeller on the bottom and a motor on the top. The shaft is broken from the center of the circle. The bulge that appears at the break is shaped like a screw pillar. There is a hole in the other half of the break that can fit the bulge. The reason cannot be analyzed now. We suspect the axle is a refurbished one. Or does this pump have this structure?
No matter what, you have to replace the shaft. It is best to use the original shaft. After taking it to the site, compare the new shaft to see if the position of the positioning pin is correct. Inspection requires cleaning the damaged area so that the problem can be revealed.
You mean there are locating pins on the shaft? Can you tell me how to position this?
It feels like the entire shaft is not machined as a whole. The broken section is tack welded with bolts first and then processed. It is probably a refurbished and repaired shaft.
You can see if this item is present when you buy a new shaft from the original factory. The film is too blurry to judge, so we can only compare it with the new axis to see if it is correct. Specifically speaking of the cause of shaft breakage, it is necessary to analyze whether it is caused by vibration, impurities and concentration of the material medium.
This is what we suspect now. If this is the case, then this merchant will no longer be able to use it.
Repeated superposition of casting defects and stress