Abstract: A method dealing with an overflow capacity of a fluid screening system is disclosed, the system (20) including a first screen (22) for screening objects of a first predetermined size from a fluid channel (21) the method comprising the step of: providing an ancillary screening system (23) upstream of the screen (22) and operational upon fluid within the channel (21) reaching a predetermined limit, the ancillary screening system screening objects of a second predetermined size from the fluid channel (21). The second predetermined size can be less than the first predetermined size. The ancillary screening system preferably can include a screen (23) placed substantially tangentially to the main flow of fluid within the fluid channel and includes a raking mechanism for cleaning objects lodged substantially adjacent the ancillary screening system. The output of the ancillary screening system can be interconnected to the fluid channel downstream of the first screen (22).

Abstract: A winching arrangement is disclosed for winching a cable comprising a winching frame; a capstan (11) for winding the cable onto; a drive motor (3) for driving the capstan; and a first clutch mechanism for disengaging the capstan from the clutch when the torsional load on the cable exceeds a first predetermined limit. Preferably, the first clutch mechanism (6) is located within the capstan and ideally the clutch mechanism is an adjustable cone clutch mechanism. The winching arrangement can further include a second adjustable clutch mechanism located adjacent the motor for providing secondary disengagement of the motor from the capstan when the cable exceeds a second predetermined limit. Further, a gear reducer (8) can be interconnected between the capstan and the drive motor. Preferably, the arrangement also includes a fixing arm (15, 18) for fixing the winch to an object wherein the cable, the capstan and the fixing arm are aligned substantially concentrically during operation.