A small gas tanker was on a loaded coastal voyage. Before arrival at the discharge port, the chief engineer and a company superintendent - who was on board to carry out an inspection of the vessel - planned to test the operation of quick-closing valves (QCVs) in the fuel oil (FO) and diesel oil (DO) tanks. At about 11.30, both the chief engineer and superintendent positioned themselves near the FO service tank and ordered the tripping of the tank's QCV from the remote emergency control station.
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