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Advantages and disadvantages of Helico-Axial and Twin Rotor pumps?

asked Oct 1, 2015 in Engineering by sabdullayev (5,290 points)
What are the advantages and disadvantages of Helico-Axial and Twin Rotor pumps?

1 Answer

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answered Oct 2, 2015 by alsieg (2,780 points) | selected Oct 2, 2015 by Normandy
 
Best answer
  Helico-Axial Twin Rotor
Advantages

Can operate up to 90% gas phase (no liquid recycle required throughout lower differential pressures)

Rotordynamic pumping, not positive displacement (no pulsation at discharge)

Greater tolerance to sand or other particulate (larger internal clearances relative to rotor design and lower relative velocities)

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

Higher efficiency
Disadvantages

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

Requires changes in speed and power to handle slugging conditions

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.

Not very tolerant of sand or other particulate, therefore requiring hard facing of the rotors and the inner bore of the liner.  Maintaining differential pressure and efficiency is reduced drastically as internal clearances are increased.

 

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