Sameinaður gaseyðingar- og flottankur

摘要

A combined degassing and flotation tank for separation of a water influent containing considerable amounts of oil and gas. A rotational flow is created in the tank which forces the lighter components such as oil and gas droplets towards a first baffle (5) from where they coalesce and rise to the surface of the liquid and are removed via the outlet (3) whereas the heavier parts are forced down where the heavy particles sink to the lower part where they may be removed as a sludge and the water is forced up between said first baffle (5) and an inner baffle (6) and leaves the tank via a central bottom outlet (4). A screen (7) may be provided centrally or as a separate unit to remove fine particles from the effluent. The combined degassing and flotation tank is particular suited for use in oil production at sea for removal of oil and gasses from water streams before the water is returned to the sea.