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Constant tension and rendering facility

Constant tension should not be confused with active heave compensation.

Constant Tension

Many Rotrex winches can be set up to operate in constant tension mode. The winch hydraulic system is pre-set via an external relief valve so as to limit the winch line pull to a pre-determined load. This load is achieved by securing the winch rope to a fixed point and then locking the winch directional control lever into the pay-in position. The winch will hydraulically stall at the pre-determined pay-in load setting. Should the winch be influenced by a greater external force than that of the pay-in load setting then the winch rope effectively pulls from the winch drum. When the external force subsides to less than that of the pay-in load setting the winch will automatically pay in whilst keeping constant tension within the winch rope.

Constant tension is very useful for many different applications such as guide wires for subsea toolboxes & crane load restraint.     

Rendering 

Rendering can be provided as a winch option for vessel applications such as mooring or subsea trenching. The winch is configured so that the winch rope will pull from the winch drum in the event that any external load becomes too great for the rated winch capacity thus preventing the winch from being pulled from its deck mountings.