Weight Distribution Example for 1.5 Tier of 15tons Coils In this respect, the actual Loading of Coils on the entire Tank Top Area may or may not reach the maximum stresses, as allowed by the Regulation. Generally, Class requirements could be considered conservative, as the spirit of the Class requirement is based on the fact that the calculation depends on the worst relative position of coils to the ship’s floors. Nonetheless, the non-CSR built vessels may be regulated by other Class-specific Rules, which do not consider wastage factor in the relevant calculations. The dominant regulations are CSR-2010 (Common Structural Rules), which consist of the most common method for such calculation adopted by all IACS Members. This loading is very different from the uniform loading and will give rise to higher stresses in the tanktop plating as well as the inner bottom longitudinals. The crossing point of the coils and the dunnage will give rise to a point load on the double bottom structure. Whilst this is the correct calculation when dealing with homogeneous bulk cargoes, which exert a uniform load on the tanktop, it is incorrect for steel coils because the load, which they exert, is not uniform. Most operators have adopted the following calculation formula of maximum tonnage per hold on the basis of: Covers only the case of 2 Tiers of 15t coils, supported by 3 rows of dunnage. In the cases where there is some information from the Builders in the Loading Manual, this is usually the bare minimum, e.g.Tank Top Strength (MT/m2) for uniform loading which however is not advisable criterion for Steel Coils Loading.
Strength calculation of steel tanks manuals#
Loading manuals of many ships used in the steel trade that carry coils, contain limited information: Calculation of steel coils loading conditions, which reflect actual loading is essential to maintain the required level of safety.
The loads derived from steel coils loading are very concentrated, leading to higher stresses in the double bottom than would be expected. Spiros Malliaroudakis (Founder & Managing Director, S.A. STEEL COILS LOADING – ITS CHALLENGES AND WAYS TO OVERCOME by Mr.
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