Abstract: A centrifugal pump for conveying a process fluid, includes a pump unit, a drive unit to drive the pump unit, a pump inlet to receive the process fluid, a pump outlet to discharge the process fluid. The pump unit includes an impeller configured to convey the process fluid from the pump inlet to the pump outlet, and a pump shaft, on which the impeller is mounted. The drive unit includes a drive shaft to drive the pump shaft, and an electric motor to rotate the drive shaft about an axial direction. A plurality of bearings is configured to support the pump shaft and the drive shaft, and a hydrodynamic coupling has a casing and is configured to hydrodynamically couple the drive shaft to the pump shaft by a transmission fluid. At least one of the plurality of bearings is arranged in the casing of the hydrodynamic coupling.

Abstract: A process fluid lubricated pump for conveying a process fluid, includes a common housing, a pump unit arranged in the common housing, a drive unit arranged in the common housing, and a hydrodynamic coupling. The common housing includes a pump inlet and a pump outlet for the process fluid. The pump unit includes at least one impeller configured to convey the process fluid from the pump inlet to the pump outlet, and a pump shaft, on which the impeller is mounted. The drive unit includes a drive shaft configured to drive the pump shaft, and an electric motor configured to rotate the drive shaft about an axial direction. The hydrodynamic coupling is configured to hydrodynamically couple the drive shaft to the pump shaft by a transmission fluid, and is configured to receive the process fluid as the transmission fluid.

Abstract: A process fluid lubricated pump includes a pump having a pump shaft extending from a drive end to a non-drive end to rotate about an axial direction, a first pump section having a first set of impellers fixedly mounted on the pump shaft to increase the pressure of the process fluid, a drive to exert a torque on the drive end of the pump shaft to drive the rotation of the pump shaft, a first balance drum fixedly connected to the pump shaft between the pump and the drive end of the pump shaft, the first balance drum defining a first front side facing the pump and a first back side, and a second balance drum fixedly connected to the pump shaft between the pump and the non-drive end of the pump shaft, the second balance drum defining a second front side facing the pump and a second back side.

Abstract: A multiphase pump for conveying a multiphase process fluid from a low pressure side to a high pressure side includes an outer housing, a casing, the casing having a pump inlet and a pump outlet for the process fluid, and a pump rotor capable of rotating about an axial direction arranged within the casing, and configured to convey the process fluid from the pump inlet to the pump outlet. The casing includes a plurality of stage segments, and the plurality of stage segments include an individual stage-segment, a low pressure segment arranged at the pump inlet and a high pressure segment arranged at the pump outlet, the individual stage-segment arranged between the high pressure segment and the low pressure segment, and the plurality of stage segments being held together by a sealing support structure, the casing being arranged within the outer housing.

Abstract: A multiphase pump includes a housing having a pump inlet and a pump outlet for a process fluid, an inlet annulus configured to receive the process fluid from the pump inlet, a discharge annulus configured to discharge the process fluid into the pump outlet, a pump rotor configured to rotate about an axial direction and arranged within the housing, the pump rotor being configured to convey the process fluid from the inlet annulus to the outlet annulus, and a return line configured to return the process fluid from the high pressure side to the low pressure side, the return line including an inlet configured to receive the process fluid, an outlet configured to discharge the process fluid and a control valve configured to open and close the return line, the inlet of the return line arranged directly at the discharge annulus.