Anti-ragging routine slashes maintenance costs

摘要

Maintenance costs and out of service hours of a critical pumping application at a Dublin Bay wastewater treatment works have been slashed by using a variable-speed drive's anti-ragging routine. The Ringsend wastewater treatment works, operated by Celtic Anglian Water (CAW), features three 90kW pumps used for transferring accumulated water from six storm tanks back to the plant for treatment. The 62,000m~3 storage tanks are used during times of high rainfall to hold the storm flows and act as buffers within the plant. The pumps were prone to ragging, caused by debris fouling the pump inlet and preventing the pump from operating normally.