A centrifugal separator comprises a bowl rotating in use around an axis of rotation. The axis of rotation extends in a longitudinal direction, and a radial direction extends perpendicular to the longitudinal direction. A base plate provided at one longitudinal end of the bowl, said base plate having an internal and external side, an outlet opening being provided in the base plate. A casing is projecting at the outlet opening on the external side of said base plate, said casing comprising a casing side, a normal to said casing side extending at an acute angle relative to a circumferential direction of the bowl at said casing and a discharge opening is provided in said casing side. The discharge opening is radially outwardly limited by a weir with an overflow edge and said discharge opening extending radially inwardly to a position above a highest intended level of liquid in the bowl.