Electric Centrifugal pumps in series  ,bare shaft pumps,which is a back-type pumps 

 1.Volute casing:cast iron

 2.Pump cover:cast iron

 3.Shaft:carbon steel or stainless steel

 4.Impeller:cast iron or bronze or stainless steel

 5.Shaft seal:gland packing seal or mechanical seal

1.General purpose water transfer and pumping

 2.Pressure boosting and water supply

 3.Chilled&condenser water circulation in central air-conditioning system

 4.Circulation in hot water systems

 5.Machine cooling water circulation

 6.Swimming pool

 7.Fire-fighting&fire sprinkler applications

 8.Irrigation and drainage

 9.Water treatment and process industry