What is Best Efficiency Point?
Best Efficiency Point (BEP) is the point at which the impeller diameter provides the highest efficiency. BEP is an important parameter in that many parametric calculations are considered when calculating BEP, such as size, , specific speed, viscosity correction, and headrise to shut-off. Professional users prefer that pumps operate within 80% to 110% of BEP for optimum performance. As you move away from the BEP, the shaft will deflect and the pump will experience some vibration. Check with the pump manufacturer to determine safe deviation levels from the BEP. Operating your pump away from BEP not only reduces efficiency but it will increase maintenance costs and may damage the pump. You can change the operating point by installing control valves, changing the impeller diameter, installing recirculation lines or selecting a different size of pump. Sometimes “safety” factors can mean that the system is designed with a pump which is too large. Such a pump will operate to the left of the B
