What are the advantages and disadvantages of Helico-Axial and Twin Rotor pumps?
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Can operate up to 90% gas phase (no liquid recycle required throughout lower differential pressures)
Rotordynamic pumping, not positive displacement (no pulsation at discharge)
Adaptation of an already proven design to multiphase applications
Maintains differential pressure at broad range of GVF
Lower capital costs than the helico-axial design
High capital cost
Differential pressure drops rapidly at high GVF values and lower viscosity—e.g., high water content
Has an unstable surge region at lower throughput
Needs a minimum amount of recycle flow (preferably liquid) to maintain seal between rotors and liner bore (only tolerates 100% gas slugs for a brief time).
Discharge pressure pulsation must be considered in the design of the piping.