Centrifugal separator

A centrifugal separator for cleaning of a gas containing liquid impurities, wherein the centrifugal separator comprises:

• a stationary casing, which encloses a separation space and has an inner wall surface facing the separation space, wherein the separation space permits the gas to flow therethrough;
• an inlet for the gas to be cleaned;
• a rotating member, which is provided in the separation space downstream the inlet with respect to the gas flow and arranged to rotate in a direction (r) of rotation around an axis (x) of rotation, wherein the rotating member is adapted to bring the gas to rotation in the direction (r) of rotation for separation by means of centrifugal forces of at least a part of the liquid impurities from the gas;
• a gas outlet, which with respect to the gas flow is provided downstream the rotating member for discharge of the cleaned gas;
• and
• a first liquid outlet, which is provided upstream the gas outlet and downstream the rotating member for discharge of the liquid impurities, and which comprises at least one outlet hole, a surrounding ring groove, which extends outwardly from the inner wall surface in the stationary casing and has a surrounding bottom surface, and wherein the outlet hole extends outwardly from the bottom surface.