Safe mooring: replacement decisions need more than rope diameter

The regulatory context

IMO’s amended SOLAS requirements for towing and mooring entered into force on 1 January 2024. The associated guidance includes inspection and maintenance of mooring equipment and lines, as well as design and selection guidance. Applicability needs to be checked against the vessel and the relevant requirements.

MSACHKL perspective

A replacement enquiry should describe the mooring arrangement and the intended use, not simply request a rope of the same diameter. Material, length, relevant strength data, documentation and compatibility with the existing arrangement need technical review.

Inspection informs purchasing

Condition findings can reveal whether the requirement is routine renewal, a particular equipment defect or part of a broader repair scope. Photographs, equipment references and service history improve the information available for that decision.

Build a complete requirement

For deck machinery intervention, include the fault history, drawings where available, onboard spares and access constraints. For replacement equipment, define the specification and documentation needed before the quote is approved. This reduces the chance that a commercially attractive item creates an installation or acceptance problem.

Build a replacement specification from the arrangement

Begin with the vessel’s existing mooring information and the intended position of the replacement item. Ask the responsible technical team to define the relevant line properties, dimensions, documentation and equipment interfaces. A product description such as the same size is not a complete specification.

For a winch or other deck machinery intervention, preserve the maker reference, equipment drawings and fault history. State whether the problem concerns mechanical fit, braking, hydraulic operation or another observed symptom. Do not treat one reported symptom as proof of a particular failed component.

Separate supply acceptance from operational acceptance

Supply acceptance concerns whether the delivered item matches the agreed requirement and documentation. Operational acceptance concerns whether it has been installed, checked and incorporated into the vessel’s arrangements as required. Assign responsibility for both before the order is finalised.

An urgent enquiry should identify the departure window and any handling, crane or access constraints. If service attendance is needed, the work scope should include the checks and records agreed with the vessel and the responsible technical personnel. The delivery of a replacement alone does not close every operational question.

Keep the evidence connected to the equipment

Inspection findings, replacement records and service reports should refer to identifiable equipment. For lines, machinery and fittings, retain the documentation needed by the vessel’s management system and applicable requirements. The details should be easy to locate during subsequent review.

The commercial lesson is straightforward: reducing uncertainty in the specification is often more valuable than saving time by leaving it undefined. A complete enquiry makes it easier to compare the quoted item, proposed alternatives and attendance requirements on the same basis.