5 Towing and mooring arrangements plan
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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1175/Rev.1 – Revised Guidance on Shipboard Towing and Mooring Equipment – (9 December 2020) - Annex - Shipboard Equipment, Fittings and Supporting Hull Structures Associated with Towing and Mooring - 5 Towing and mooring arrangements plan

5 Towing and mooring arrangements plan

 5.1 The SWL and TOW for the intended use for each shipboard fitting should be noted in the towing and mooring arrangements plan available on board for the guidance of the master. It should be noted that TOW is the load limit for towing purposes and SWL is the load limit for mooring purposes.

 5.2 Information provided in the plan should include, in respect of each shipboard fitting:

  • .1 location on the ship;

  • .2 fitting type;

  • .3 SWL/TOW;

  • .4 purpose (mooring, normal towing or other towing); and

  • .5 method of applying load of towing or mooring line including limiting fleet angle, i.e. angle of change in direction of a line at the fitting.

5.3 Furthermore, information provided on the plan is to include:

  • .1 the arrangement of mooring lines showing number of lines (N);

  • .2 the ship design minimum breaking load of each mooring line (MBLSD);

  • .3 the length of each mooring line;

  • .4 restrictions or limitations on the type (including material and construction), stiffness and diameter of mooring lines which are compatible with the mooring equipment and fittings; and

  • .5 the acceptable environmental conditions as given in appendix A, section 3 for the recommended ship design minimum breaking load of mooring lines for ships with Equipment Number EN > 2000:

    • .1 30 second mean wind speed from any direction (vW or vWfootnote according to 3.1.3 or 3.2.2, respectively); and

    • .2 maximum current speed acting on bow or stern (±10°).

  • Note: When the applied design environmental criteria exceed the above given criteria, information provided in the plan should include the design environmental criteria, similar to the parameters in appendix A:

    • .1 wind speed and direction; and

    • .2 current speed and direction.

Parent topic: Annex - Shipboard Equipment, Fittings and Supporting Hull Structures Associated with Towing and Mooring
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