Patent ID: 9382800
Filing Date: 2016-07-05
CPC Classification: F01C,F04D

Claim Text:
1. A pump assembly for use with a high viscosity or multiphase hydrocarbon fluid comprising: a stator having an internal surface of constant diameter and one or more stator vanes extending from the internal surface to a constant stator vane radial height along a length of the stator; and a rotor having an external surface of constant diameter and one or more rotor vanes extending from the external surface to a constant rotor vane radial height along a length of the rotor, wherein the one or more stator vanes have an opposite handed thread with respect to a thread of the one or more rotor vanes and the stator and rotor co-operating to provide, on rotation of the rotor, a system for moving the high viscosity or multiphase hydrocarbon fluid longitudinally between them, wherein a radial gap, having a constant value in the range of 1.28 mm to 10 mm, is located between the constant stator vane radial height and the constant rotor vane radial height along a length of the pump assembly, and wherein a ratio of the constant rotor vane radial height to the constant stator vane radial height has a constant value in the range of 1.1 to 20 along the length of the pump assembly.