Section 10 Topside structure
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Offshore Units, July 2022 - Part 10 Ship Units - Chapter 1 General Requirements - Section 10 Topside structure

Section 10 Topside structure

Parent topic: Chapter 1 General Requirements

10.1 General

10.1.1 The minimum scantlings of superstructures and deck-houses are to comply with the requirements of Pt 4, Ch 6, 9 Superstructures and deck-houses. Corrosion additions, determined in accordance with Pt 10, Ch 1, 12 Corrosion additions, are to be added to these scantlings. Bulwarks and guard-rails are to comply with Pt 4, Ch 6, 10 Bulwarks and other means for the protection of crew and other personnel but special consideration is to be given to the scantlings of bulwarks at the fore end or screens protecting the swivel stack. In general, the scantlings of bulwarks at the fore end are not to be less than required for deck-house fronts at the position under consideration.

10.1.2 For units with unconventional forward ends and units which may be subjected to high deck loading in excess of the minimum Rule heads due to loading from green seas, adequate protection by means of bulwarks and breakwater structure is to be provided at the forward end and the scantlings of the structure and its under-deck supports are to be specially considered. Where necessary the loadings are to be determined by model tests.

10.1.3 The boundary bulkheads of accommodation spaces which may be subjected to blast loading in accordance with Pt 7, Ch 3 Fire Safety are to be designed in accordance with Pt 4, Ch 3, 4 Structural design loads and permissible stress levels are to be in accordance with Pt 4, Ch 5, 2.1 General 2.1.1 – load case (d) in Pt 4, Ch 5, 2 Permissible stresses.

10.1.4 For units fitted with a process plant facility and/or drilling equipment, the support stools and integrated hull support structure to the process plant and other equipment supporting structures, including derricks and flare structures, are considered to be classification items, regardless of whether or not the process/drilling plant facility is classed, and the loadings are to be determined in accordance with Pt 3, Ch 8, 2 Structure. Loading from the topsides should consider the most onerous scenarios, including environmental loads, equipment operating weights and inertia loads due to hull motions. Permissible stress levels are to comply with Pt 4, Ch 5 Primary Hull Strength or Pt 4, Ch 3 Structural Design.

10.1.5 Equipment supports are to take into account hull deflections when considered necessary.

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