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11246 Damage Mechanisms in Double-Screw Pumps for Heavy Crude Oil

Picture for 11246 Damage Mechanisms in Double-Screw Pumps for Heavy Crude Oil
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Product Number: 51300-11246-SG
ISBN: 2011 11246 CP
Author: Ioana Cristina Grigorescu, Gladys Navas and Medardo A. Camacaro
Publication Date: 2011
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This paper summarizes the surface damage mechanisms that were observed in three double-screw pumps used for the transfer of high viscosity crude oil and their relations with pump operation conditions, flow characteristics and material defects.

Erosion-corrosion governs the degradation of the screws; however the balance between chemical and mechanical damage varied according to local flow pattern and content of formation water, gas and solids. Along the screws, the thickness of the fluid film between threads and the inner surface of the pump case varies when excessive screw deflection occurs. Flow instability, mainly local gas compression - decompression, enhances the erosive attack with solid particles and intensify the fatigue inducing conditions. Contact areas between spindle and bearing or gears are corroded by the pumped fluid leaked through the mechanical seals, which viscosity is reduced due to the contained gas; clearances that developed in these corroded areas enhance fatigue.

Key words: screw-pump, corrosion – erosion, multiphase – flow, NiCrBSi coating
This paper summarizes the surface damage mechanisms that were observed in three double-screw pumps used for the transfer of high viscosity crude oil and their relations with pump operation conditions, flow characteristics and material defects.

Erosion-corrosion governs the degradation of the screws; however the balance between chemical and mechanical damage varied according to local flow pattern and content of formation water, gas and solids. Along the screws, the thickness of the fluid film between threads and the inner surface of the pump case varies when excessive screw deflection occurs. Flow instability, mainly local gas compression - decompression, enhances the erosive attack with solid particles and intensify the fatigue inducing conditions. Contact areas between spindle and bearing or gears are corroded by the pumped fluid leaked through the mechanical seals, which viscosity is reduced due to the contained gas; clearances that developed in these corroded areas enhance fatigue.

Key words: screw-pump, corrosion – erosion, multiphase – flow, NiCrBSi coating
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