Barrel pull-out pumps are centrifugal pumps enclosed by a casing which resembles a barrel. In the case of feed pumps for power station applications they are also called barrel-type pumps or barrel casing pumps.
See Fig. 1 Barrel pull-out pump
The barrel is fitted with a suction nozzle and a discharge nozzle A discharge cover and inlet ring are bolted to the respective barrel faces. The drive shaft passes through the cover on the discharge side and the inlet ring on the suction side. Both passages are sealed by a shaft seal.