Be Careful With Lines Under Tension!


Mooring deck fatalities as a result of snap-back continue to occur despite well published guidance on the hazard, warns the UK MAIB. Parting of tensioned mooring lines has been associated with some of the worst human injuries, and loss of life registered in Gard’s claims portfolio. Use of worn mooring lines, overtightening of the brakes, or sudden movements of the ship are among the main reasons for ropes straining beyond their breaking limits and parting, reports grad.

Safer mooring operations

In a safety reminder published in July 2022, the UK Marine Accident Investigation Branch (MAIB) highlights that such incidents continue to occur despite well published guidance on the subject. Even though there have been many advances in technology and automation in the shipping industry, mooring decks remain a place where people need to work in proximity to heavy lines under tension and interaction is unavoidable. For this reason, it is important that the safety guidance is followed, says the UK MAIB, and emphasizes the following three key components for safer mooring operations:

  • Equipment:

Making sure the right equipment is used and then maintained in good condition is essential to keeping safe on mooring decks. Mooring lines need to be regularly inspected to make sure that wear and tear has not degraded the line, there are no hard spots on synthetic lines and no signs of contamination by oils and greases.

The lead of each mooring line needs to be considered carefully to avoid placing additional stress on the lines or introducing chafe points. Inappropriate or poorly maintained equipment has previously contributed to incidents where lines have parted or released under tension and struck crew members, therefore meticulously checking equipment for anything untoward is critical for the safety of the crew.

  • Planning and Briefing:

Planning is important when conducting any mooring deck operations. The risk assessment and control measures should be reviewed for each new operation and planning should take account of the expected mooring configuration, paying particular attention to the potential risk of snapback. Areas where mooring deck operations take place need to be kept tidy and mooring lines should be closely monitored on all berths – this is vitally important when there is a large range of tide.

Planning effectively also involves making sure that all seafarers are adequately briefed on the mooring configurations, that they know what to do, and that they are positioned on parts of the deck that are less dangerous. Enough crew should be on deck to conduct the job safely, but too many crew should be avoided as it can unnecessarily place others at risk.

  • Communication:

Finally, crew communication is of the utmost importance when working on mooring decks, because it has the potential to be extremely hazardous if people are not able to interact clearly. Everybody involved in an operation needs to communicate effectively but must also consider the number of circuits in use.

Too many voices on the same circuit can cause confusion and risk over-talking, however, using separate circuits can leave some crew in the dark. Ultimately, effective communication can be the difference between being safe and putting people at risk, therefore it is important that the mooring plan ensures that good communications can be maintained between all parties involved in the mooring operation.

Other recommendation

For UK-flagged ships, Chapter 26 of the Maritime and Coastguard Agency’s Code of Safe Working Practices for Merchant Seafarers provides advice on the matter. Other flag states may have similar recommendations. Section 19 of the ILO’s Code of practice for accident prevention on board ship at sea and in port also provides practical recommendations and guidance related to mooring and unmooring operations. 

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Source: grad


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