The incident

On 6 November 2017, the fully laden, mini cape-size dry bulk carrier 'Orient Centaur' was transiting the South Channel, Weipa, Queensland, outbound under the conduct of harbour pilots as part of a trial introduction of this size of ship to the port.

While in the South Channel, the ship’s main engine shut down due to a loss of water from a cracked engine cooling component, and propulsion was lost.

Shortly after, the ship grounded on the northern batter of the channel. The stern then slowly swung across the channel and grounded on the southern batter.

Under the guidance of the harbour pilots, three tugs were used to successfully refloat the ship. The ship was subsequently towed out of the channel to an anchorage.

Surveys conducted over the following days identified that the ship did not sustain any damage.

 

Findings

The ATSB found that the approval process for this size of ship had only considered the risks associated with a main engine failure before the departing ship’s entry into the narrow South Channel.

Consequently, the tugs were not in attendance to assist if propulsion was lost.

Additionally, the port risk assessment did not require the use of an escort tug for any ships transiting the South Channel during outbound voyages, and the tug masters had not been trained in the specifics of escort towage nor in emergency response.

Tugs were to be available to escort the mini cape-size ships until they had entered the South Channel, where they were stood down. However, the tug masters had not been trained in the specifics of escort towage nor in emergency response,

...the ATSB stressed.

Meanwhile, at the time of the incident, it was unlikely that an emergency response to a pollution incident in the Port of Weipa would have been initiated in a timely manner.

Subsequently, appropriate proactive action has been taken to address the emergency response issues.

However, the investigation highlighted that the actions of the pilots, ship's crew members and tug masters following their arrival at the ship were timely and significantly reduced the consequences of the occurrence.

 

Actions taken

  • The ship’s managers advised there is now weekly on board testing of cooling water and every 6 months at a shore laboratory. Also, only manufacturers’ original spares are to be used during maintenance.
  • In addition to the trial conditions, an escort tug is now used for all departing bulk carriers. All departing ships over 200 m now have an escort tug made fast, from the wharf to the South Channel exit. Further, two continuously manned, 85 tonne bollard pull azimuth stern drive tugs are now based at the Port of Amrun, about 60 minutes steaming time from the Port of Weipa.
  • All pilots and tug masters have completed emergency response and escort towage training at the Smartship simulator. The training included emergency towage scenarios, positioning and use of tugs in an emergency, competency in standard escort tug manoeuvres and indirect towage.
  • Arrival and departure briefs developed for the Port of Weipa have been updated with safety settings for the electronic chart display and information system, tidal information, weather conditions, wind limits and tug positions/line lengths. All masters and ship bridge teams are briefed before arrival and departure.

 

Safety message

The introduction of this size of ship to the Port of Weipa was preceded by identification, and risk assessment, of a number of hazards. However, aspects of tug escort and the potential for malfunction of the heavily‑laden ships within the confined channel were not considered.

This occurrence highlights the importance of considering potential hazards from end to end in order to provide the best opportunity to manage safety risk,

...noted ATSB Director of Transport Safety Stuart Macleod.

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