![]() Calculations can be complex-depending on the geometry of the compartment. The grain stability booklet is required for vessel engaged in the carriage of bulk grain. Volumetric heeling moments are calculated by naval architects and tabulated in the vessel’s approved grain booklet. How is the data about volumetric heeling moment provided on ships? To obtain the actual weight heeling moment for a particular grain the volumetric heeling moment is divided by the stowage factor of that grain. A ship may load the grain of different stowage factors. It is common practice to calculate and tabulate the volumetric heeling moment of different compartments instead of weight heeling moment. Volumetric heeling moment is the product of the volume of grain that would shift multiplied by athwartship distance through which it would shift. ![]() ![]() In the grain stability book, why the volumetric heeling moments are used and not the weight heeling moment? It is also assumed to be equal to the volume of void multiplied by shift of their centroid. ![]() Volumetric heeling moments are expressed in m 4. Grain heeling moment is the product of the volume of the shifted grain multiplied by the horizontal distance between its initial and final centres of gravity. Grain heeling moments are produced by a grain shift. ![]()
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