The Bruce DENNLA (Drag Embedment Near Normal Load Anchor) can be preset ahead of rig arrival on location for systems where taut or semi-taut (minimal grounded length) systems are being used. Delmar can provide technical support to monitor the line catenaries as the anchors are being set and proof-loaded.

Once the AHV (anchor handling vessel) has set the DENNLA on bottom near the proposed anchor location, it begins to pay out mooring components that will be in the mooring system as it moves away from the anchor down the proposed heading of the mooring line. Once a sufficient amount of component is payed out, the vessel powers up and bollard pull is induced at the anchor. Excessive uplift or bollard pull may result in the anchor slipping, causing lost time with it needing to be reset. Too little power may result in the anchor not setting properly.

Once the DENNLA is set, the AHV will back off of its power and recover component until there will be ~40° of uplift at the anchor for the pin shear condition. Once this has been done, the boat will again power up and put sufficient tension at the anchor to shear the pin. It is extremely important for the catenary to be monitored in this condition because again, too high of an anchor angle may result in slippage. Too little power or insufficient uplift may result in the pin not shearing.