Clasification Society Rules and Regulations - Rules and Regulations for the Classification of Offshore Units, January 2016 - Part 3 FUNCTIONAL UNIT TYPES AND SPECIAL FEATURES - Chapter 4 Accommodation and Support Units - Section 2 Structure
Section 2 Structure
2.1 Plans and data submission
- Structural plans of the accommodation including deckhouses and modules.
- Design calculations for containerised modules.
- Module support frames or skids and details of attachments.
- Structural arrangements and supports under diving installations.
- Structural arrangements in way of crane supports.
- Structural arrangements and supports under pipe laying equipment.
2.2 General
2.2.1 The general hull strength is to comply with the requirements of Pt 4 STEEL UNIT STRUCTURES, taking into account the applied weights and forces due to the accommodation, diving installations, pipe laying equipment and cranes, and the local structure is to be suitably reinforced. Attention should be paid to loads resulting from hull flexural effects at support points.
2.2.2 The scantlings of structural deckhouses are to comply with Pt 4, Ch 6, 9 Superstructures and deckhouses.
2.2.3 The strength of containerised modules which do not form part of the main hull structure will be specially considered in association with the design loadings.
2.2.4 When containerised modules can be subjected to wave loading or protect openings leading into buoyant spaces, the scantlings are not to be less than required by Pt 3, Ch 4, 2.2 General 2.2.2.
2.2.5 The structural strength of the connections between containerised modules and the supporting frame or structure are to comply with the general strength requirements of Pt 4, Ch 6, 9 Superstructures and deckhouses, taking into account the unit’s motions and marine environmental aspects.
2.2.6 The connections of containerised modules are also to satisfy an
emergency static condition with an applied horizontal force 
in any direction as follows:
= W sin θ N (tonne-f)
where
2.2.7 In the emergency static condition defined in Pt 3, Ch 4, 2.2 General 2.2.6 the permissible stress levels are to be in accordance with Pt 4, Ch 5, 2.1 General 2.1.1
2.3 Watertight and weathertight integrity
2.3.1 The general requirements for watertight and weathertight integrity are to be in accordance with Pt 4, Ch 7 Watertight and Weathertight Integrity and Load Lines.
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