Vertical pump manufactures have experimented with new pump impeller and bowl designs to increase pump efficiencies, but they have not addressed the internal flow through the “piping portion” of the pump. Unlike horizontal pumps, vertical pumps have interior elbows and turns that cause turbulence and this can impact the overall efficiency of the pump, especially at high flow rates.

The benefits of adding the CRV® shows that the pumps performance can be improved significantly by understanding the turbulence caused by the elbow and solving that problem. This will translate into a significant cost savings for the customer. Additional savings will also be realized, because the uniform flow created by the CRV® will eliminate the harmful flow effects caused by fluid separation, turbulence and vibration in the pump. Eliminating this source of vibration caused by fluid turbulence will increase shaft and impeller life, bearing and seal wear and reduce pump noise. This translates into additional cost savings by reducing maintenance intervals, with less downtime and a higher operating reliability.

Pre-CRV® installation: Pulsating back pressure, excessive vibration, head box breakage, bearing wear & shaft breakage

Post-CRV® installation: Prevents check valve oscillation, reduces pump vibration problems, and increases efficiency.



Vertical Pump CRV®     

Data in FLOaway Report



The Benefits of Installing a CRV® shows that:

Three Stage Vertical Turbine Pump (FLOaway Paper)

At Best Efficiency Point (BOP)

• Pump Head increased By 2%
• Pump Efficiency Increased By 2%
• Pump Vibration Decreased By 37%
• Pump Horsepower Needed Decreased

Vertical Axial Flow Pump (Lawrence)

Pump Showed an increase of 2 - 4% in efficiency at rated flows.

Pump showed an increase of 5 - 10% in Total Discharge Head (TDH) at rated flows

Pump Cavitation Eliminated

Vanes Stop Fluid Shear in Pipe Elbow. Vertical Pump CRV Applications of New Technology at Power Generating Plants. Power Engineering October 1993.