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Tanker vessel underwater inspection by divers.,Science & Technology,#underwater #diving #colombia #chemical #tanker #inspection,propeller,full,speed,Tanker vessel hull inspection near Colombia coast. Air escaping from stern tube is wartsila air guard system. Aft seal in stern tube is without oil and pressurized by air. Therefore it is not possible that stern tube oil is contaminated by water. In stern tube main engine circulating oil can be used, no need to replace by VGP environmental friendly oil.
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