CENTRIFUGAL SEPARATOR

The invention relates to a centrifugal separator (1) comprising a casing (15) which delimits and seals off a space (18) in which a rotor is arranged. The rotor (2) forms a separation space which is sealed or isolated from the space (18), and in which separation space (7) centrifugal separation of a higher density and a lower density component from a fluid takes place. An inlet (9) extends into the rotor (2) for introducing fluid to the separation space (7), and a first outlet (25) extends from the rotor (2) for discharge of a component separated from the fluid. The space (18) is connected to a pump device (19) which is arranged to remove gas, thereby maintaining negative pressure in said space. The rotor (2) comprises at least one second outlet extending from the separation space (7) to the space (18) for discharge of at least one higher density component separated from the fluid. The invention also relates to a method in such a centrifugal separator.