Modular centrifugal separator and base unit thereof and system

A base unit of a modular centrifugal separator configured for separating a liquid feed mixture into a heavy phase and a light phase,

• the modular centrifugal separator comprising the base unit and an exchangeable separation insert, the exchangeable separation insert being configured to form the only part of the modular centrifugal separator, which is in contact with the liquid feed mixture, and the separated heavy and light phases,
• wherein the base unit comprises a stationary frame, a rotatable member configured to rotate about an axis of rotation arranged in the stationary frame, a driver for rotating the rotatable member about the axis of rotation, and at least one bearing,
• wherein the rotatable member has a first axial end and a second axial end, and delimits an inner space at least in a radial direction, the inner space being configured for receiving at least one part of the exchangeable separation insert therein such that portions of the rotatable member delimiting the inner space are fully separate from the liquid feed mixture, and the separated heavy and light phases during use of the modular centrifugal separator,
• wherein the rotatable member is provided with a first opening at the first axial end configured for a first fluid connection of the exchangeable separation insert to extend through the first opening,
• wherein the rotatable member comprises a second opening at the second axial end configured for a second fluid connection of the exchangeable separation insert to extend through the second opening,
• wherein the rotatable member is journalled in the stationary frame via the at least one bearing, and
• wherein the at least one bearing is arranged at an axial position along the axis of rotation such that the at least one bearing extends around a portion of the inner space delimited by the rotatable member.