Marine Orders - Part 33: Cargo and cargo handling—grain, Issue 4
Sheltered water exemptionsSheltered water exemptions
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Appendix
Sheltered water exemptions
1 Voyages between ports in Spencer Gulf[13]
1.1 Metacentric height
1.1.1 The ship's metacentric height (GM) corrected for the effects of free surface of fluids must not be less than a value equal to:[14]
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where:
H = the total volumetric heeling moment for the proposed loading in accordance with 1.2 of this Appendix;
SF = the stowage factor of the grain;
= the ship's displacement as proposed for the loading; and
R = the lesser of 0.325 or the value given by twice the freeboard on passage divided by the moulded breadth.
1.1.2 In no case may the ship's metacentric height as corrected for the effects of the free surface of liquids be less than 0.3 metres.
1.2 Calculation of heeling moment
1.2.1 If the ship is provided with a document of authorization:
H = total volumetric heeling moment,
where the heeling moments are taken from the ship's grain loading information corrected, where appropriate, for vertical shift.
1.2.2 If a ship has no document of authorization, but has holds constructed with 2 or more vertical or 2 or more sloping grain-tight longitudinal divisions having an inclination of more than 30 degrees to the horizontal so disposed as to limit the effect of transverse shift of grain:
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where:
A = 1.26 when the centre of gravity of the cargo is taken to be volumetric centre of the compartment loaded, or 1.34 when the actual centre of gravity of the cargo is used;
Image unavailable in extracted text = the sum of the heeling moments of filled compartments taken from the ship's grain loading information; and
Image unavailable in extracted text = the sum of the heeling moments for partly filled compartments taken from the ship's grain loading information.
1.2.3 If a ship is not provided with a document of authorization and is not a ship referred to in 1.2.2 of this Appendix:
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where:
Image unavailable in extracted text = the sum of the lengths of filled compartments;
Image unavailable in extracted text = the sum of the lengths of partly filled compartments;
B = moulded breadth of the ship; and
Vd = average void depth for filled compartments.