D3000 Vortex

When is a vortex impeller the best choice?
 
Where long fibrous materials case clogging. Should a rag wrap itself around a vortex impeller there is a temporary loss in capacity until the end of the pumping cycle, when the rag falls off from the impeller?
 
In low volume, high head applications, the channel in a single vane impeller tends to be rather small, making it susceptible to clogging. A vortex impeller can produce similar performance curves, without the risk of clogging.
 

In media which contains sand and other abrasive solids. Because pumping is effected by the vortex, particles in the liquid do not come into contact with the impeller itself, minimising wear. Vortex impellers also reduce wear in the pump house.

 

Vortex impeller

With a vortex pump, flow through the unit is produced not by the actual impeller, but by, a rapidly rotating vortex that is created by the impeller. This kind of pump offers two major advantages and one disadvantage. Because the pumping action is produced be the vortex, particles in the liquid do not come into contact with the impeller itself, thereby minimising wear. A second advantage is the open design of the volute: positioned high on the roof of the volute, the impeller takes up very little space, making for a large area through which sizeable solids can freely pass.

On the minus side is efficiency. Precisely because the volute is so open, the hydraulic losses are much greater in comparison with shrouded channel impellers.
 
Abrasion resistant vortex impeller.
Where cast iron pumps are tough, vortex pumps are tougher. Still tougher are vortex pumps with hardened cast iron hydraulic ends. Hardening the volute and impeller makes the difference; pumps that can take three times more punishment than the ordinary non-hardened vortex pump.