A separation system for separating a liquid mixture includes a centrifugal separator. The centrifugal separator includes a stationary frame, a rotatable assembly and a drive unit for rotating the rotatable assembly relative the frame around an axis of rotation. The separator further includes a feed inlet for receiving a liquid mixture to be separated, a first liquid outlet for discharge of a separated liquid light phase and a second liquid outlet for discharge of a liquid heavy phase having a density that is higher than said liquid light phase. The rotatable assembly.sup., includes a rotor casing enclosing a separation space in which a stack of separation discs is arranged to rotate around a vertical axis of rotation. The separation space is arranged for receiving liquid mixture from said feed inlet. The separation system further includes a container arranged downstream of said first and/or second liquid outlet for receiving discharged liquid phase, and a scale for measuring the weight of discharged liquid phase contained in said container.

A method of operating a centrifugal separator is provided. The method includes supplying a liquid mixture to be separated to the inlet of the centrifugal separator, separating the liquid mixture into at least one separated liquid component and a separated sludge component, discharging at least one separated liquid component from at least one liquid outlet of the centrifuge rotor, removing gas from a space surrounding a centrifuge rotor of the separator, to obtain a sub-atmospheric pressure in the space, and discharging a separated sludge component from at least one sludge outlet arranged at a periphery of the centrifuge rotor to the space which is delimited by a frame, wherein the discharging is performed when the sub-atmospheric pressure in the space surrounding the centrifuge rotor is within a preset pressure interval ΔP.

A method of operating a centrifugal separator is provided. The method includes supplying a liquid mixture to be separated to the inlet of the centrifugal separator, separating the liquid mixture into at least one separated liquid component and a separated sludge component, discharging at least one separated liquid component from at least one liquid outlet of the centrifuge rotor, removing gas from a space surrounding a centrifuge rotor of the separator, to obtain a sub-atmospheric pressure in the space, and discharging a separated sludge component from at least one sludge outlet arranged at a periphery of the centrifuge rotor to the space which is delimited by a frame, wherein the discharging is performed when the sub-atmospheric pressure in the space surrounding the centrifuge rotor is within a preset pressure interval ΔP.

A separator for separating a flowable suspension in a centrifugal field into at least two flowable phases of different density. The separator includes a housing, which is stationary during operation and is designed as a tank having at least three openings. The three openings include an inlet for an inflowing suspension and two outlets vertically spaced apart from each other for flowable phases of different density. Annular spaces of the housing are associated with the two outlets. A rotatable drum is arranged within the housing and has a vertical axis of rotation. The drum has three openings, corresponding to the openings of the housing. A multi-part support and drive device, which keeps the drum suspended within the housing, is supported and is set into rotation. An air gap is formed vertically between the two outlets and annular spaces of the housing during operation. The air gap is not filled with one of the outflowing phases during operation when the drum is rotating.

A separator for separating a flowable suspension in a centrifugal field into at least two flowable phases of different density. The separator includes a housing, which is stationary during operation and is designed as a tank having at least three openings. The three openings include an inlet for an inflowing suspension and two outlets vertically spaced apart from each other for flowable phases of different density. Annular spaces of the housing are associated with the two outlets. A rotatable drum is arranged within the housing and has a vertical axis of rotation. The drum has three openings, corresponding to the openings of the housing. A multi-part support and drive device, which keeps the drum suspended within the housing, is supported and is set into rotation. An air gap is formed vertically between the two outlets and annular spaces of the housing during operation. The air gap is not filled with one of the outflowing phases during operation when the drum is rotating.

A centrifugal separator and a method of operating the separator are disclosed. The separator includes a centrifuge rotor having a rotor wall enclosing an inner space containing a stack of separation disks. The rotor includes an inlet for a product, a first outlet for a light phase of the product, and a second outlet for a heavy phase of the product. The second outlet includes a plurality of outlet channels extending along an inner side of the rotor wall from an outer region towards an inner region of the inner space. Each outlet channel transports a flow of the heavy phase from the outer region. The separator includes a plurality of temperature sensors provided at a respective outlet channel. Each sensor senses a temperature in the proximity of the respective outlet channel and provides a signal representing the sensed temperature.

A centrifugal separator and a method of operating the separator are disclosed. The separator includes a centrifuge rotor having a rotor wall enclosing an inner space containing a stack of separation disks. The rotor includes an inlet for a product, a first outlet for a light phase of the product, and a second outlet for a heavy phase of the product. The second outlet includes a plurality of outlet channels extending along an inner side of the rotor wall from an outer region towards an inner region of the inner space. Each outlet channel transports a flow of the heavy phase from the outer region. The separator includes a plurality of temperature sensors provided at a respective outlet channel. Each sensor senses a temperature in the proximity of the respective outlet channel and provides a signal representing the sensed temperature.

A separation disc for a centrifugal separator is adapted to be included in a stack of separation discs inside a centrifugal rotor for separating a fluid mixture. The separation disc has a truncated conical shape with an inner surface and an outer surface and a plurality of spot-formed spacing members extending from at least one of the inner surface and the outer surface. The spot-formed spacing members are for providing interspaces between mutually adjacent separation discs in a stack of separation discs, and the plurality of spot-formed spacing members are tip-shaped and taper from a base at the surface of the separation disc towards a tip extending a height from the surface. A stack of separation discs, a centrifugal separator and a method for separating at least two components of a fluid mixture are also disclosed.

A separation disc for a centrifugal separator is adapted to be included in a stack of separation discs inside a centrifugal rotor for separating a fluid mixture. The separation disc has a truncated conical shape with an inner surface and an outer surface and a plurality of spot-formed spacing members extending from at least one of the inner surface and the outer surface. The spot-formed spacing members are for providing interspaces between mutually adjacent separation discs in a stack of separation discs, and the plurality of spot-formed spacing members are tip-shaped and taper from a base at the surface of the separation disc towards a tip extending a height from the surface. A stack of separation discs, a centrifugal separator and a method for separating at least two components of a fluid mixture are also disclosed.

A separation disc for a centrifugal separator is adapted to be included in a stack of separation discs inside a centrifugal rotor for separating a fluid mixture. The separation disc has a truncated conical shape with an inner surface and an outer surface and a plurality of spacing members extending from at least one of the inner surface and the outer surface. The spot-formed spacing members are for providing interspaces between mutually adjacent separation discs in a stack of separation discs. The separation disc further includes at least one elongated rib extending from the inner surface to a height (h) that is less than the height (H) to which the plurality of spacing members extend. Further, at least one elongated rib extends from first position on the inner surface to a second position on the inner surface. The second position is at a radial distance that is larger than the radial distance of the first position, and the relation between the height of the elongated ribs (h) and the spacing members (H) are h/H>0.7.