5.4 Conditions of loading
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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC/Circular.456 – Guidelines for the Preparation of Intact Stability Information – (Adopted on 13 October 1986) - Annex - Guidelines for the Preparation of Intact Stability Information - 5 Category 2 - 5.4 Conditions of loading

5.4 Conditions of loading

 Conditions of loading appropriate to the operation of the ship should be included showing the practical limits of service for which the ship is intended and to demonstrate the stability characteristics in relation to the specified stability criteria.

 The following conditions of loading should also be included unless they are clearly inappropriate:

  • .1 light condition;

  • .2 docking condition;

  • .3 the conditions of loading stipulated in section 1 of appendix II to resolution A.167(ES.IV);

  • .4 departure and arrival conditions of loading for which the ship has been specially designed (e.g. alternate hold loading, timber deck cargoes, containers on deck etc.).

 Where icing is likely to occur the loading conditions should take this into account.

  5.4.1 Each condition of loading should include:

  • .1 a sketch of the ship indicating, pictorially, the main items of deadweight included in the displacement.

  • .2 a table showing the lightship particulars, the distribution of all components of the deadweight, the positions of their centres relative to the defined reference planes, corresponding static moments and a summation giving the result. The result should show the full weight of displacement and the position of its centre.

  • .3 a table listing the free surface effects of liquids in all compartments which may be partly filled.

  • .4 a diagram showing the curve of righting levers (GZ) plotted against angle of inclination. The righting levers are to be corrected for free surface effects (see .3).

  • Wind and/or other heeling lever curves are to be superimposed on the diagram as appropriate and it should be demonstrated that all the stability criteria have been met.

  • The scales used in this diagram should be the same for each loading condition.

  • .5 a summary of the appropriate condition giving:

    • .5.1 displacement;

    • .5.2 corresponding designed trim draught at longitudinal centre of flotation;

    • .5.3 moment to change trim one unit;

    • .5.4 longitudinal position of centre of buoyancy;

    • .5.5 longitudinal position of centre of gravity;

    • .5.6 trimming lever;

    • .5.7 total trim over perpendiculars;

    • .5.8 longitudinal position of centre of floatation;

    • .5.9 trim at forward perpendicular;

    • .5.10 trim at after perpendicular;

    • .5.11 draught at forward perpendicular;

    • .5.12 draught at after perpendicular;

    • .5.13 draught at the forward draught mark (if required);

    • .5.14 draught at the after draught mark (if required);

    • .5.15 mean draught amidships;

    • .5.16 the total free surface moment for initial stability;

    • .5.17 the vertical position of the transverse metacentre;

    • .5.18 the vertical position of the ship's centre of gravity uncorrected and corrected for free surface effects;

    • .5.19 the transverse metacentric height (GM) uncorrected and corrected for free surface effects;

    • .5.20 a statement giving the limiting value or values of stability parameters taken from the data provided under 5.1 together with corresponding values achieved.

Parent topic: 5 Category 2
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