� PERSONNEL LIFTING COMPLIANT WITH EN 13852-1 OR API-2C Heila offers its customers a complete range of solutions for personnel lifting that comply with EN 13852-1 or API-2C. Heila can equip its cranes with ‘dedicated winches’ for personnel lifting or ‘dual use winches’ that can be used for both cargo handling and personnel lifting up to 8 metric tons � CONSTANT TENSION (CT) WINCHES A Heila constant tension winch system combines a special winch, a customised electronic control system and a dedicated PLC. Constant tension winches are used for difficult lifting operations in marine environments. The system creates a constant line-pull between the load and the winch. Prior to starting the operation the line-pull is set. It is measured by a load sensor and monitored by the PLC central control system. If the actual value differs from the pre-set value, the winch will pay in or pay out wire rope to maintain the pre-set value. Constant tension winch systems are suitable for pre-tensioning the wire rope used in buoy-laying operations, but also when positioning and connecting floating pipelines during dredging projects. Moreover, they are perfect for raising and lowering tender boats or deck equipment from a vessel into sea. � ACTIVE HEAVE COMPENSATION (AHC) Current offshore and subsea projects require advanced technology to position loads on the seabed for subsea installations or to position them in the air, for instance when servicing wind turbines. An AHC system on the crane compensates for the vessel’s motion. Heila supplies tailor-made AHC systems on winches that rely on the input of motion sensors. Responding to the signal from these sensors, the winch pays in or pays out wire rope to keep the load at a constant elevation. An AHC system on a winch responds rapidly and, when combined with active hydraulic accumulators, reduces power consumption significantly. 17
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