Centrifugal separator for separating a liquid mixture with positive displacement pumps respectively downstream of outlets

A centrifugal separator for separation of a liquid mixture comprising:

• a stationary frame, a rotatable assembly and a drive unit for rotating the rotatable assembly relative the frame around an axis of rotation,
• wherein the rotatable assembly comprises a rotor casing enclosing a separation space in which a stack of separation discs is arranged to rotate around a vertical axis of rotation, and further comprises an exchangeable separation insert and a rotatable member, said exchangeable separation insert comprising said rotor casing and being supported by said rotatable member,
• said rotor casing further comprising:
• a mechanically hermetically sealed inlet for supply of said liquid mixture to said separation space;
• and
• a first liquid outlet that is mechanically hermetically sealed and arranged for discharge of a separated liquid phase and a second liquid outlet that is mechanically hermetically sealed and arranged for discharge of a separated heavy phase, said heavy phase having a density that is higher than said liquid phase;
• at least one second positive displacement pump arranged downstream of said second liquid outlet for transporting the separated heavy phase from said separation space;
• and
• at least one first positive displacement pump arranged downstream of said first liquid outlet for transporting the separated liquid phase from said separation space,
• wherein each of said at least one first positive displacement pump and said at least one second positive displacement pump is a peristaltic pump, and
• wherein the centrifugal separator is configured such that supply of the liquid mixture to the separation space is solely driven by a suction force generated by at least one of said at least one first positive displacement pump and said at least one second positive displacement pump.