A pump assembly, comprising: a rotating assembly having a rotor, a rotating sleeve positioned on one axial side of the rotor and a rotating fluid inlet positioned on the other axial side of the rotor, wherein the rotating fluid inlet is positioned to deliver fluid to said rotor along a defined central axis, said fluid inlet comprising a suction shaft; a stationary pitot tube assembly having at least one pitot tube positioned within said rotor; a fluid discharge having a central axis which is axially arranged with the defined central axis of said rotating fluid inlet, the fluid discharge being axially spaced from said fluid inlet in such a way, that it extends to the one axial side of the rotor; a drive mechanism connected to the rotating assembly to provide rotation of both said suction shaft and said rotating sleeve together as a result of the rotation of said rotor; a suction seal housing portion of a pump housing, said suction shaft extends through said suction seal housing portion, the suction seal housing portion being arranged to provide an air gap in contact with a seal mechanism positioned in said suction seal housing portion; and a bearing positioned about said suction shaft and an isolator plate positioned against said bearing, said isolator plate being held in position against the suction seal housing portion with a securement ring orientated toward said air gap and spaced from said seal mechanism positioned in said suction seal housing portion to isolate said bearing from said air gap, wherein said rotor is journalled between said rotating sleeve, which is supported by a further bearing positioned in the pump housing, and said suction shaft, which is supported by the bearing. a rotating assembly having a rotor, a rotating sleeve positioned on one axial side of the rotor and a rotating fluid inlet positioned on the other axial side of the rotor, wherein the rotating fluid inlet is positioned to deliver fluid to said rotor along a defined central axis, said fluid inlet comprising a suction shaft; a stationary pitot tube assembly having at least one pitot tube positioned within said rotor; a fluid discharge having a central axis which is axially arranged with the defined central axis of said rotating fluid inlet, the fluid discharge being axially spaced from said fluid inlet in such a way, that it extends to the one axial side of the rotor; a drive mechanism connected to the rotating assembly to provide rotation of both said suction shaft and said rotating sleeve together as a result of the rotation of said rotor; a suction seal housing portion of a pump housing, said suction shaft extends through said suction seal housing portion, the suction seal housing portion being arranged to provide an air gap in contact with a seal mechanism positioned in said suction seal housing portion; and a bearing positioned about said suction shaft and an isolator plate positioned against said bearing, said isolator plate being held in position against the suction seal housing portion with a securement ring orientated toward said air gap and spaced from said seal mechanism positioned in said suction seal housing portion to isolate said bearing from said air gap, wherein said rotor is journalled between said rotating sleeve, which is supported by a further bearing positioned in the pump housing, and said suction shaft, which is supported by the bearing.