Abstract: The invention provides an apparatus for separating components of a fluid stream comprising a first centrifugal separator and a further separator; the first centrifugal separator comprising: a support structure and a centrifugal separator unit rotatably mounted on the support structure so as to be rotatable about a rotational axis extending through the centrifugal separator unit; a drive element for driving rotation of the centrifugal separator unit; wherein the centrifugal separator unit comprises a centrifugal separation chamber having an inlet which is connected or connectable to a source of fluid requiring separation, a first outlet for collecting a higher density component of the fluid stream, and a second outlet for collecting a lower density component of the fluid stream; the first outlet being connected or connectable to a first collector for collecting the higher density component and the second outlet being connected or connectable to a second collector for collecting the lower density component.

Abstract: A horseshoe (110) comprising a core (30) of rigid material sandwiched between two layers (40, 50) of shock absorbing elastomeric material. At least one of the elastomeric layers (40, 50) is bonded to the core (30) at a face (31, 33) where the core (30) has a plurality of indentations (32) or a plurality of raised humps (34). A preferred shoe (110) has raised lips (160, 164) and ridges (170) formed in its lower face (146).