The PREROSTAL Prerotation system is a unique, economical,
uncomplicated method of automatically adjusting pumping volume to
varying inflow rates using a constant speed motor and pump. It
combines the screw centrifugal impeller characteristics of the
WEMCO-Hidrostal pump with a specially configured vortex inducing
chamber around the suction pipe of the pump. The chamber utilizes
gravity to impart a fluid spin in the same direction of rotation as
the pump impeller, and this spin produces a flow reduction without
the necessity of changing pump speed.
Features / Benefits
- Lower overall energy use than variable speed
installations.
- Less capital investment than other systems.
- Less maintenance.
- No sophisticated controls to service.
- Eliminates vacuum truck cleaning when scum is pumped to main
lift pumps.
- No manual labor intensive, and time consuming wet-well wash
down.
- Reduced odor, gas, and wet-well/piping corrosion.
- Easy to retro-fit to existing stations.
- Maximum flexibility in location to your site specific,
individual application: Can be permanently mounted in the bottom of
your station, shelf-mounted at a level that provides maximum
skimming capability with conventional slide rail system or flexible
rubber discharge hose, suspended from the top of your station with
the built in yoke with a flexible rubber hose, or furnished with a
VFD so the pump speed can be adjusted to fit your exact application
situation and no separate motor starter required.
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