SIMSITE® Structural Composite High Specific Speed Pump Impellers are Superior to Metallic Impellers, because they are engineered to eliminate the vortexing and cavitation problems that are inherent in high specific speed pump impellers! ImpellerStore is able to do this because our SIMSITE® Impellers are not cast or molded. Rather, SIMSITE® Impellers are machined on the outside as well as the inside on 5 to 8 axis machining centers.
Impellers that develop a high flow rate with a relatively low head are described as high specific speed impellers. A high suction specific speed impeller is one that is designed with a very large impeller eye diameter when compared to the overall outside diameter. High Specific Speed impellers have a geometry which has a smaller outside diameter with large, more axial flow passages.
The specific speed of an impeller influences the shape of the Head –Capacity Curve (HQ Curve). High specific speed impellers generate a much steeper HQ curve from shut off to the operating point.
Typical Metallic Impeller suffering from Suction Recirculation, Cavitation as well as Corrosion.
Precision-Machined Simsite® High Specific Speed Structural Composite Impeller Which will Never Corrodes in Seawater, Waste Water or Chlorinated Water.
Although these high specific speed impellers can deliver a larger flow with a smaller impeller diameter, they are much more susceptible to vortexing and damage from recirculation cavitation, which will destroy a metallic impeller in a very short period of time. Fortunately, SIMSITE® Impellers are engineered to reduce or eliminate the effects of cavitation. Because SIMSITE® Impellers are precision machined from solid blocks of the structural composite, the impeller vane geometry can be engineered utilizing CFD (Computerized Fluid Dynamics) techniques and programs to eliminate the vortexing and cavitation problems experienced by cast or molded metallic impellers.
SIMSITE® Engineered composite impellers & Casing Rings offer even greater savings, because they can be engineered to make the pump operating point the Best Efficiency Point (BEP) which significantly increases efficiency! (The farther away the pump operates from BEP, the lower the efficiency, and the higher the radial loading, movement and vibration.) The machined vane surfaces provide smoother surface finishes, which allows for a lower coefficient of friction with self-lubricating qualities. Machined Structural Composite Impellers & Rings are 5 to 6 times lighter than metallic impellers and run on tighter wear ring to casing ring clearances. This provides reduction in mechanical losses as well as volumetric losses. Since machined composite impellers are perfectly balanced, both hydraulically and mechanically, and maintain this balance throughout the life of the pump, this reduces vibration, and allows the pump to operate more efficiently which reduces downtime and operational costs. Engineered structural composite products also prove light weight, reducing start-up load and shaft deflection. The result is an increase in the lifetime of Bearings, Seals, Rings and Sleeves!
