Section 5 Number and disposition of bulkheads
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Offshore Units, July 2022 - Part 4 Steel Unit Structures - Chapter 3 Structural Design - Section 5 Number and disposition of bulkheads

Section 5 Number and disposition of bulkheads

Parent topic: Chapter 3 Structural Design

5.1 General

5.1.1 The number and disposition of watertight bulkheads are to be arranged to ensure adequate strength and the arrangements are to suit the requirements for subdivision, floodability and damage stability. They are also to be in accordance with the requirements of the National Administration in the country in which the unit is registered and/or in which it is to operate, see Pt 1, Ch 2, 1 Conditions for classification and Pt 4, Ch 7 Watertight and Weathertight Integrity and Load Lines.

5.1.2 Bulkheads are to be spaced at reasonable uniform intervals. Where, due to the design of a unit, the spacing of bulkheads is unusually great, the transverse strength of the unit is to be maintained by fitting suitable web frames between the bulkheads. Details of bulkheads and intermediate web frames are to be submitted for approval.

5.1.3 The requirements of Pt 4, Ch 3, 5.3 Column-stabilised units are to be complied with as applicable.

5.2 Self-elevating units

5.2.1 The arrangement of longitudinal and transverse bulkheads are to satisfy the overall strength requirements given in Pt 4, Ch 4 Structural Unit Types and Pt 4, Ch 5 Primary Hull Strength when the unit is in the elevated position and when afloat.

5.2.2 The number and arrangement of watertight bulkheads are to meet the requirements of damage stability.

5.2.3 Watertight bulkheads are to extend to the uppermost continuous deck.

5.3 Column-stabilised units

5.3.1 The arrangement of watertight bulkheads and flats are to be made effective to that point necessary to meet the requirements of damage stability.

5.3.2 The arrangement of longitudinal and transverse bulkheads in the upper and lower hulls and in columns are to satisfy the overall strength requirements given in Pt 4, Ch 4 Structural Unit Types and Pt 4, Ch 5 Primary Hull Strength.

5.3.3 The subdivision and arrangement of bulkheads and cofferdams on production and oil storage units are also to comply with Pt 3, Ch 3 Production and Storage Units.

5.4 Buoys and deep draught caissons

5.4.1 The number and arrangement of structural bulkheads are to satisfy the overall strength requirements in Pt 4, Ch 5 Primary Hull Strength. The requirements of Pt 4, Ch 3, 5.1 General 5.1.1 and Pt 4, Ch 3, 5.3 Column-stabilised units are to be complied with.

5.5 Tension-leg units

5.5.1 In general, the number and arrangement of structural bulkheads are to comply with Pt 4, Ch 3, 5.3 Column-stabilised units.

5.6 Protection of tanks carrying fuel oil and lubricating oil

5.6.1 The requirements for the protection of tanks carrying fuel oil and lubricating oil, which are given in Pt 3, Ch 3, 4.7 Separation and protection of tanks of the Rules for Ships, are to be complied with, as applicable.

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