Barrel type centrifugal pump - has volute built into outlet duct to increase delivery pressure

摘要

A barrel type centrifugal pump or open pit pump is housed in a cylinder (1) installed below the water level. Water flows in through the inlet (6), across the impeller (4) and up the central pipe (3). A volute casing (5) is attached to the upper end of the central pipe (3) and deflects the water to the outlet (7). Using a volute instead of the usual T junction increases the delivery pressure of the pump. The principle can be equally well applied to a pump with a double sided impeller. In addition the delivery pressure may be still further increased by installing a second impeller in the mouth of the volute casing.