- Multi-stage means that the pump is fitted with more than one impeller.
- Additional impellers are added to increase the pump’s final head without having to increase the pump’s capacity..
- The discharge of each stage should be positioned 180 degrees from the previous stage to reduce shaft deflection when operating off the best efficiency point (BEP).
In a good multistage design the first stage would discharge to a second stage mounted on the other end of the pump. The stages would then alternate on either end of the pump causing a reduction in axial thrust and a simpler sealing problem.
In the above design it would be a common practice to cross connect the stuffing boxes of the first and second stages located on the pump ends.
- On February 16, 2018