Clasification Society Rulefinder 2016 - Version 9.25
Clasification Society Rules and Regulations - Rules and Regulations for the Classification of Offshore Units, January 2016 - Part 4 STEEL UNIT STRUCTURES - Chapter 1 General - Section 5 Definitions |
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Section 5 Definitions5.1 General5.1.1 Rule length, L, in metres, for self-elevating units and semi-submersible units with twin lower hulls is to be taken as 97 per cent of the extreme length on the maximum design transit waterline measured on the centreline or on a projection of the centreline, see Pt 4, Ch 1, 5.1 General 5.1.1. Figure 1.5.1 Rule length for self-elevating units and semi-submersible units with twin lower hulls5.1.2 The Rule length, L, for ship units and other surface type units is the distance, in metres, on the summer load waterline from the forward side of the stem to the after side of the rudder post or to the centre of the rudder stock if there is no rudder post. L is to be not less than 96 per cent, and need not be greater than 97 per cent, of the extreme length on the summer load waterline. In ships with unusual stem or stern arrangements the Rule length, L, will be specially considered. 5.1.3 The Rule length for units with unconventional form will be specially considered in relation to the transit or operating waterlines. 5.1.4 Breadth, B, is the greatest moulded breadth, in metres. 5.1.5 Depth, D, is measured, in metres, at the middle of the length, L, from the top of keel to top of the deck beam at side on the uppermost continuous deck. 5.1.6 Draught, , is the maximum design operating summer draught, in metres, measured from top of keel. 5.1.7 Draught, , is the maximum design transit summer draught, in metres, measured from top of keel. 5.1.8 The block coefficient, , is the moulded block coefficient corresponding to the maximum design draught T based on the Rule length L and moulded breadth B as follows: where 5.1.9 In general, the forward perpendicular, F.P., is the perpendicular at the intersection of the waterline at the draught T with the fore end of the hull. The aft perpendicular, A.P., is the perpendicular at the intersection of the waterline at the draught T with the aft end of the hull, see also Pt 4, Ch 1, 5.1 General 5.1.2. 5.1.10 Amidships is to be taken as the middle of the Rule length, L, measured from the forward side of the stem or hull. 5.1.11 Lightweight is defined as the weight of the complete unit with all its permanently installed machinery, equipment and outfit, including permanent ballast, spare parts normally retained on board, and liquids in machinery and piping to their normal working levels, but does not include liquids in storage or reserve supply tanks, items of consumable or variable loads, stores or crew and their effects. |
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