Surface pump assembly
View Patent ↗A surface mounted pump assembly includes a centrifugal pump having a plurality of impellers and an electric motor adapted to drive the pump such that a thrust load from the pump is transmitted to the motor.
1. A pump assembly, comprising:
a skid;
an electric motor mounted on the skid;
a pump, comprising:
a housing mounted on the skid;
an intake chamber connected to the housing;
a discharge flange coaxial with the housing and connected to the housing at an end distal from the intake chamber;
a single shaft disposed in the housing; and
a plurality of stages oriented in the same direction, each stage comprising:
a mixed axial and radial flow impeller rotationally coupled to the single shaft; and
a diffuser in fluid communication with the impeller;
a bell housing directly connecting the intake chamber to the motor;
angular contact bearings disposed in the motor and operable to transmit thrust from the single shaft to the motor;
a mechanical seal disposed between the motor and the pump and around the single shaft for sealing the intake chamber from atmosphere; and
a coupling directly rotationally coupling the single shaft and the motor and disposed between the mechanical seal and the motor,
wherein:
the motor is filled with oil to provide lubrication for the angular contact bearings,
the coupling is also disposed in the bell housing,
the bell housing has a window formed through a wall thereof, and
the window exposes the coupling to atmosphere.
2. The pump of claim 1 , further comprising:
a second mechanical seal disposed between the motor and the pump and around the shaft, and
a reservoir containing buffer fluid and in fluid communication with the mechanical seals.
3. The pump of claim 1 , wherein a power of the motor is less than 100 horsepower.