Mars Report No. 69 by The Nautical Intitute
The Nautical Institute has issued Mars Report No. 69 'A bridge too near' regarding unpredictable situations between pilots, tug crews and vessel crews when manoeuvring in ports.
After discharging a parcel of cargo, a tanker prepared for departure from her berth adjacent to a bridge across the harbour entrance. Tugs were secured forward and aft using ship's lines for each tug. Departure procedure, as agreed with the pilot, was to tow the vessel upstream against the current, then turn the vessel at a distance that would allow the vessel to gain minimum steerage speed while proceeding with the current for passage past the bridge.
Communication with the tugs was conducted in the local language due to the pilot's advice that the tug crews had a poor knowledge of English. The tug aft was reported to be placing excessive force on the lines and exerting this in a jerky manner, creating shock loads. While lining up for the transit through the bridge the aft tug lines parted, thankfully without injury to any crew at the aft mooring station. However, due to the aft tug becoming useless, several minutes later the ship landed against the northernmost bridge caisson leading to structural hull damage to the vessel.
While a situation of this sort remains impossible to predict until such time as it becomes fact, an agreement could be made with the Harbour Master to sail only on a flood tide. This would enable the ship to stem the current at all times while manoeuvring to pass through the bridge thus offering a much greater margin of safety, greater controllability of the vessel and more time available to assess an unplanned event.
Learn more by clicking at Mars Report No.69 issued by The Nautical Institute.