Open ballast tank causes internal flooding
Corrective and preventative actions A cargo vessel berthed during the evening and began discharging steel cargo alongside a wharf. According to the discharging plan, it was intended to discharge cargo from hold nos. 2, 4 and 6 initially. During this sequence, sea water ballast was to be pumped into Nos. 1, 4 and 6 (port and starboard) wing tanks. At times, due to the uneven distribution of cargo in the holds, the vessel took a list to one side, and the ballast tank valves were appropriately controlled to keep the ship close to upright.Soon after midnight, the valves of Nos 1 and 4 wing tanks were shut and ballasting of No 6 wing tanks commenced. Tank soundings were not monitored during the ballasting operations, and the quantity of sea water in the tanks was not estimated either. At about 0130 hrs, a '440 V Insulation Fail' alarm activated at No. 1 deck crane power distribution panel on the main switchboard. The power cables to the deck cranes passed through the port side passageway. Suspecting moisture in the junction boxes, the electrician opened the access to the passageway, and was shocked to find that it was flooded with ballast water. Portable ...
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