CRYOGENIC SUBMERGED PUMP FOR LNG, LIGHT HYDROCARBON AND OTHER ELECTRICALLY NON-CONDUCTING AND NON-CORROSIVE FLUIDS

摘要

A cryogenic submerged multi-stage pump assembly includes a vertically oriented pump shaft. A permanent magnet electrical motor includes a rotor attached to the pump shaft and a stator disposed about the rotor. A first-stage impeller assembly includes a first impeller attached to the pump shaft, the first impeller configured to move a cryogenic fluid from a first impeller inlet to a first impeller outlet when the pump shaft is rotated by the electric motor. A second-stage impeller assembly includes a second impeller attached to the pump shaft, the second impeller configured to move the cryogenic fluid from a first impeller housing to a second impeller inlet and then to a second impeller outlet when the pump shaft is rotated by the electric motor. The first and a second impeller housing are disposed about the first and second impellers and configured to channel the cryogenic fluid.

主权项

1. A cryogenic submerged multi-stage pump assembly, comprising:
a vertically oriented pump shaft; an electrical motor comprising a rotor attached to the pump shaft and a stator disposed about the rotor, wherein the electrical motor comprises a permanent magnet electrical motor; a first-stage impeller assembly comprising a first impeller attached to the pump shaft, the first impeller configured to move a cryogenic fluid from a first impeller inlet to a first impeller outlet when the pump shaft is rotated by the electric motor, and a first impeller housing disposed about the first impeller and configured to channel the cryogenic fluid once it exits the first impeller outlet; and a second-stage impeller assembly comprising a second impeller attached to the pump shaft, the second impeller configured to move the cryogenic fluid from the first impeller housing to a second impeller inlet and then to a second impeller outlet when the pump shaft is rotated by the electric motor, and a second impeller housing disposed about the second impeller and configured to channel the cryogenic fluid once it exits the second impeller outlet to a discharge tube or discharge outlet; wherein the first-stage impeller assembly is disposed below the second-stage impeller assembly, and where the second-stage impeller assembly is disposed below the permanent magnet electrical motor.