CENTER LINE DESIGN C022-5
The illustration on the right shows a standard centrifugal pump with the feet attached to the bottom of the pump volute. Thermal expansion of the volute causes the volute to move straight up causing several problems:
- Pipe strain of the suction piping.
- The mechanical seal stationary face will move off center from the rotating seal face.
- In a stationary seal design the stationary face will “wipe” across the rotating face.
- The rotating wear ring can contact the stationary wear ring in closed impeller designs.
Now take a look at the illustration on the left that describes a “center-line” design.
This design allows the volute to thermally expand both up and down, eliminating the growth problems.