1 The crude oil and gas reservoir Alwyn North is located in the North Sea and has been exploited since 1987. The current daily yield is about 85 000 barrels of oil and 11 million m 3 gas. The Dunbar platform is situated in the southern part of this region. Multi-phase pumps (MPP) can handle oil-gas mixtures without the need for phase separa- tion of the constituents. The multi- phase hydraulic system was devel- oped by the Institut Français d

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