Multiply that by 3.14 and you would get just a little bit less than two meters for the circumference. The mechanical seal faces can separate because of the induced vibration and shaft run out. The seal faces can become damaged as the vibration causes the carbon to bounce against the hard face. Seal drive lugs wheel experience premature wear. Shaft fretting will increase dramatically under bearing grease seals and original equipment mechanical seal designs.
Product attaches to the impeller.
Impeller wear and damage caused by erosion and corrosion. A seal or sleeve that is not concentric to the shaft. Set screws guarantee that it will not be concentric. The coupling, impeller, mechanical seal, bearings, sleeve, keys, etc. were not balanced as an assembly. The impeller diameter was reduced and not re-balanced.