Impeller Tip Speed Calculator
Here’s a comprehensive table summarizing all you need to know about Impeller Tip Speed:
| Aspect | Details |
|---|---|
| Definition | The velocity produced at the impeller tip due to the rotation and diameter of the impeller12 |
| Calculation Formula | u = πDN / 60 Where: u = Impeller tip speed (m/s or ft/s) D = Impeller outside diameter (m or ft) N = Impeller rotation speed (rpm)12 |
| Significance | Essential parameter for pumps handling liquids with solid particles1 |
| Impact on Pump Performance | Higher tip speed increases erosion rate, potentially leading to premature pump failure1 |
| Typical Units | Meters per second (m/s) or Feet per second (ft/s)2 |
| Limitations for Different Applications | – Dirty water: 40 m/s (130 ft/s) – Medium slurries (up to 25% solids): 35 m/s (115 ft/s) – High concentration slurries: 30 m/s (100 ft/s) – Elastomeric impellers: 26 m/s (85 ft/s)1 |
| Material-specific Max Tip Speeds | – Stainless steel: 95-110 m/s (18,696-21,648 ft/min) – Cast iron: 40-50 m/s (7,872-9,840 ft/min) – Rubber/elastomers: 25-30 m/s (4,920-5,900 ft/min)2 |
| Relation to Wear Rate | Wear Rate ≈ rpm³ (Higher RPM leads to lower slurry pump life)5 |
| Considerations for Pump Selection | – Lower tip speed for longer pump life – Balance between tip speed and impeller diameter – Material strength limitations25 |
| Importance in Design | Critical factor in engineering phase to prevent continuous problems and premature failure13 |
This table provides a comprehensive overview of impeller tip speed, including its definition, calculation method, significance in pump performance, limitations for various applications, and considerations for pump selection and design.