Cornell Centrifugal Pumps Solve Ragging Problems In A Washington Pump Station

Research and development at a Washington pump station solves ragging problems and reduces electrical costs by 50 percent.
Cornell Centrifugal Pumps Solve Ragging Problems In A Washington Pump Station
Five variable-speed model 8NHTA 250 hp centrifugal pumps from Cornell Pump serve the 18 mgd (design) 117th Street Pump Station in Vancouver. Pump No. 1 (foreground) ragged up in two hours even when run constantly at 100 percent speed.

Severe ragging plagued the 18 mgd (design) 117th Street Pump Station in Vancouver, Wash., from the day it entered service in 2008.

The station, built to handle the city’s future growth, has five variable-speed model 8NHTA 250 hp centrifugal pumps from Cornell Pump. Each...

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