*Note:
This monthly safety moment is collected from various sources for
educational purpose and is not an
actual incident from the ESM fleet.
Courtesy Hong Kong Merchant Shipping Information Note 49/2007 |
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About four hours after docking, the Third Mate
relieved the watch and then went on deck to check the lines which had been tended about an hour before. Unfortunately for this ship's officer, he was in the wrong place at the wrong time when one of the lines parted. Within five short minutes of coming on watch, the Mate became a victim of what is sometimes called "synthetic line snap-back." Struck in the head and neck, he died several days later.
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Investigators felt that slackened lines, caused by an outgoing tide and strong winds, resulted in powerful surges and heavy strains on the mooring lines which then caused them to part. The line that struck the Mate was made of nylon and had a rated breaking strength of 46.6 tons. When it finally parted, an incredible amount of energy was released causing the line to "snap-back" in a manner similar to what occurs when a very large rubber band breaks. Later, it was found that another line had also parted. |
 Chafing of the mooring lines as they passed out the roller chock may have also contributed significantly to the mooring line failure. The angle of the mooring line as it passed out the chock and down to the dock was very severe. Combined with the powerful surges that the vessel experienced and the fact that no chafing gear was being used at that time, the conditions were right for this accident to occur. |
Lessons Learnt |
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Safety on any ship, whether inport or underway, depends upon the vigilance of its personnel. Many situations outside of the ordinary can be easily corrected or overcome simply through heightened awareness. Personnel must also be constantly aware of the status and condition of the ship's equipment. This is especially true when certain variables work in concert to increase the potential for hazards. If equipment is missing or improperly used, quite simply, it will not function properly and could cause an accident. |
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Moorings to be frequently checked and adjusted as required.
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Frequency of these checks must be increased at berths exposed to risks such as largely varying tides, weather, narrow channels, passing ships, etc. |
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Mooring checks and adjustment to be carried out by at least two personnel. |
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If chafing due to mooring layout cannot be avoided, measures to mitigate chafing of ropes must be taken. |
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Mooring equipment to be well maintained as per PMS however due to exposure to weather these have to be specifically checked and attended to prior arrival port. |
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Any concerns regarding the mooring equipment must be brought to the attention of the chief officer and master and immediately addressed. |
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Pre-arrival/Toolbox meetings to identify risks and corrective actions must be carried out diligently. |
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