Section 7 Superstructures, deckhouses and bulwarks
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Special Service Craft, July 2022 - Part 3 General Requirements and Constructional Arrangements - Chapter 2 Craft Design - Section 7 Superstructures, deckhouses and bulwarks

Section 7 Superstructures, deckhouses and bulwarks

Parent topic: Chapter 2 Craft Design

7.1 General

7.1.1 Superstructures, deckhouses and bulwarks are to be constructed in accordance with the scantlings indicated in Pt 6, Ch 3, 9 Superstructures, deckhouses and bulwarks, Pt 7, Ch 3, 9 Superstructures, deckhouses and bulwarks and Pt 8, Ch 3, 9 Superstructures, deckhouses and bulwarks, for steel, aluminium alloy and composite structures respectively.

7.2 Definition of tiers

7.2.1 The lowest, or first tier, is normally that which is directly situated on the deck to which D is measured. The second tier is the next tier above the lowest tier and so on. See Figure 2.7.1 Definition of tiers.

7.2.2 Where the vertical distance between the weather deck and the summer load waterline is equal to or greater than the sum of the minimum freeboard and one standard superstructure height, then proposals to treat the first tier erection as a second tier, and so on, will be specially considered. The standard height of superstructure is the height defined in Pt 3, Ch 1, 6.13 Superstructure 6.13.3. See Figure 2.7.1 Definition of tiers.

Figure 2.7.1 Definition of tiers

7.2.3 Suitable scarfing arrangements are to be made to ensure continuity of strength and the avoidance of abrupt structural changes.

7.3 Unusual designs

7.3.1 Craft or structural arrangements which are of unusual design, form or proportions will be individually considered. Special features will be considered in each separate case.

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