SHAFT DEFLECTION. THE PROBLEMS IT CAUSES S044
Excessive shaft deflection can cause a lot of problems including:
- Opening up the mechanical seal faces when the rotating portion of the seal contacts a stationary component.
- Overloading of the bearings, especially the radial bearing.
- A change in the seal face loading
- A change in the flow direction of a dual seal convection tank.
- Damage to the impeller and volute.
- Excessive wear ring wear and loss of pump efficiency as the gap increases. This is a major concern with “vertical, in line” designs.
- Excessive shaft fretting (wear and damage) at the bearing seal locations.
- Damage to the bearing seals.
- Packing sleeve wear.
- Excessive packing leakage.
- Overheating of the packing.
- Damage to the stuffing box throat bushing.
- Damage to an API (American Petroleum Institute) gland disaster bushing.
- The breaking of a stationary seal face.
- Axial movement can change the seal face loading
- Impeller clearance will be altered. In some cases the impeller could contact the volute or pump back plate.