Protection of marine installations from moving ice

Details Protection of marine installations from moving ice Protection of marine installations from moving ice

E - Fixed Constructions

02

B

114/58

E02B 15/02 (2006.01) E02B 17/00 (2006.01)

Patent

CA 1280645

ABSTRACT PROTECTION OF MARINE INSTALLATIONS FROM MOVING ICE A drag unit to absorb the kinetic energy from large floating bodies of ice is constructed around a buoyancy chamber (14). The buoyancy chamber is attached to a torque arm (16) and this is secured at its remote end to an anchor line (6). The buoyancy chamber supports a rotatable drag wheel (20) at either end. The drag wheels each have a plurality of sharp impeller blades on their outer surfaces. The drag wheels are impeded from rotation by brakes (40) attached to the buoyancy chamber (14), the brakes being energised hydraulically from a high pressure gas chamber (71). When a large mass of ice contacts the drag wheels, a braking force determined by the pressure in the gas chamber (71) is applied to the ice, thereby reducing its speed.

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