Hot Fuel Oil Spill Causes Fire in Tanker Engine-room

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Transport Malta has issued an accident investigation report regarding a fire incident in the engine-room the Maltese registered chemical / oil tanker Askara occurred after fuel oil transfer operations.

The incident

On 01 March 2016, the Maltese registered chemical / oil tanker Askara departed the port of Kobe, Japan after completing her cargo discharge operations. The vessel was bound for Hong Kong for bunkers. In preparation for the bunkering operations, and in order to avoid mixing the new parcel of bunkers with the one already on board, the chief engineer instructed the second engineer to transfer all the fuel oil from port heavy fuel oil (HFO) storage tank to starboard HFO storage tank.

The fuel oil transfer was carried out successfully as requested by the chief engineer. However, towards the end of the transfer, the second engineer noticed that the low level alarm fitted on port HFO storage tank did not activate. A manual sounding of port side HFO storage tank confirmed that the fuel oil had indeed been transferred and that the level was well below the 0.5 m (the level which should have triggered the low level alarm).

Suspecting a fault in the low level alarm switch, the second engineer instructed the third engineer to overhaul the alarm low level alarm switch on port side HFO storage tank in order to identify and rectify the fault. The task was also discussed between the third engineer and the chief engineer and the necessary ‘Permit to ‘Work’’ document was issued.

Just after 1700 (LT) on 05 March 2016, after his engineering watch, the third engineer commenced the dismantling of the low level alarm switch. The low level alarm was a conventional float switch, fitted by means of four studs and its removal was a relatively simple task. At about 1710, immediately after dismantling the low level alarm float switch, fuel oil escaped almost instantaneously from the opening. It was immediately evident that the tank from where the low level alarm switch had been removed contained a significant volume of fuel oil and there was enough static pressure for the leaking fuel oil to reach the main engine exhaust manifold. The third engineer tried to mount the fuel oil low level alarm back to the tank in an attempt to stop the fuel oil leak. However, in view of the heavy flow and the high temperature of the fuel oil, he was unsuccessful. Soon after, the fuel oil coming in contact with the main engine’s exhaust manifold auto ignited.

Shortly after, the fire alarm sounded around the vessel. One of the oilers, who was on duty in the engine-room, tried to extinguish the fire by using one of the portable foam applicators. He did manage to extinguish the fire on the main engine, however, another fire developed in way of the turbocharger’s turbine side.

By 1713, the engine-room fire squad team members had assembled and donned their firemen’s outfits and mobilised the fire fighting equipment. The engine-room ventilation was stopped and fire dampers were closed at about 1715. The chief engineer also activated the main engine emergency stop and interrupted the electrical supply to the engine-room.

In the meantime, the engine-room fire squad team had already started to tackle the fire but by 1725, the fire had spread to the generators’ area and it became evident that it was beyond control. On the basis of the feedback provided from the engine-room, the master decided to activate the fixed CO2 system and flood the engine-room to extinguish the fire.

Following the application of the relevant procedures, the fixed CO2 system was activated at 1730. The Company was informed of the occurrence and the vessel remained adrift in a black out condition, about 50 nautical miles off the coast of Hong Kong.

By 0839 of the following day, Askara’s engine-room had cooled enough to allow access to the crew members for an assessment of the fire damages.

Cause of the fire

It was established that the immediate cause of the fire was hot fuel oil spilling from port HFO storage tank and coming in contact with the main engine exhaust manifold.

Location of port HFO storage tank (green outline) and HFO settling tank (red outline)

Actions Taken

During the course of this safety investigation, the Company took the following safety actions:

  • All bunker system components (including valves, flanges, sensors drains, etc.), were identified and marked with a stencil;
  • A new bunker tank component checklist has now been included in the safety management system;
  • Tool box meetings and risk assessments have been included in Company-run seminars for senior and junior engineers;
  • An internal investigation was carried out in accordance with Section 9 of the ISM Code and the findings were distributed on board Company ships

Recommendations

In view of the safety actions taken by the Company, no recommendations have been made following the safety investigation.

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Source: Transport Malta

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