South Walker Creek CHPP
Situation
- A 3/2 AH Warman slurry pump ran at a constant 2950 rpm (regardless of process requirements) with a pressure-sustaining valve diverting excess water back to a water tank.
- Motor load was consistently above 31kW. This setup did not allow for adjustable speed; the valve wasted energy by pinching off excess water, but still strained the motor since it was running at a constant load.
The Solution
- A MagnaDrive Adjustable Speed Drive (ASD) was installed at South Walker Creek CHPP on October 4th 2007.
- The intent was to remove the sustaining valve and control the pump output with only the ASD
The Results
- The valve was removed and the pump is now controlled by the ASD
- The pumping system now consumes 350 kWh less per day vs. the valve-based control.
| Date | 08/02/06 | 03/28/08 | 03/29/08 | 04/14/08 |
| Average Pump Speed (RPM): | 2950 | 1740 | 1670 | 1750 |
| Average Motor Input Power (kW): | 31.8 | 17.9 | 16.6 | 17.4 |
| Total Energy Consumed / Day (kWh): | 764.7 | 431.1 | 398.7 | 418.6 |
| Estimated Energy Consumed / Annum (kWh): | 273,528 | 154,188 | 142,603 | 149,725 |