Pumps lower operating expenses
Three 300 hp long-shaft pumps at the Baltic Avenue Pump Station in Atlantic City, N.J., were sized to handle expected growth from casinos. When the growth did not materialize, the pumps operated inefficiently and cavitated, damaging the impellers.
A consultant for Atlantic City Sewerage Co. recommended replacing the units with submersible pumps from Flygt (Xylem). The utility bought a 135 hp pump delivering 9,600 gpm at 36 feet total dynamic head (TDH) and two 200 hp pumps delivering 13,500 gpm at 40 feet TDH. The pumps had variable-frequency drives and were mounted in a dry-pit configuration to handle 8 to 15 mgd.
The utility has saved 10 to 30 percent in energy costs and maintenance. Operators appreciate their quieter work environment. 704/409-9750; www.xyleminc.com.
Blower reduces energy usage
City officials wanted to reduce operating expenses at the 6 mgd (design) Charleston (Ill.) Sewage Treatment Plant by upgrading the Hoffman multistage aeration blowers.
They selected a Hoffman Revolution Model R07 high-speed centrifugal blower from Gardner Denver. The unit, with active magnetic smart bearing technology, replaced two 250 hp and one 150 hp multistage blowers.
Related: Top Performer - Plant: Making It Fit
The city expected a 25 percent reduction in electricity usage, but realized a 47 percent reduction in the first month. 800/682-9868; www.hoffmanandlamson.com.