Section 8 Longitudinal bulkheads
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Ships, July 2022 - Part 4 Ship Structures (Ship Types) - Chapter 8 Container Ships - Section 8 Longitudinal bulkheads

Section 8 Longitudinal bulkheads

Parent topic: Chapter 8 Container Ships

8.1 General

8.1.1 The requirements of Pt 4, Ch 1, 9 Bulkheads are to be applied, together with the requirements of this Section.

8.1.2 Longitudinal bulkheads may be transversely or longitudinally framed, except in way of the topside torsion box which is, in general, to be longitudinally framed.

8.1.3 Longitudinal bulkheads are to be maintained continuous in way of the machinery space where this is situated between container holds and as far forward and aft as practicable.

8.1.4 The scarfing arrangements in way of the steps are to be sufficient to ensure an efficient overlap of the inner skin bulkheads.

8.1.5 The ShipRight FDA Procedure, Structural Detail Design Guide (SDDG), indicates recommended examples of structural design configurations in critical areas of the double side skin structures.

8.2 Side shell primary supporting structure

8.2.1 Where the longitudinal bulkhead forms the inner skin of the side shell primary supporting structure the thickness of longitudinal bulkhead plating is to be verified by direct calculations as described in Pt 4, Ch 8, 14.2 Procedures for verification of primary structure scantlings.

8.3 Plating and stiffeners

8.3.1 The scantlings of longitudinal bulkheads are to satisfy the requirements of Pt 4, Ch 8, 3 Longitudinal strength and Pt 4, Ch 8, 8.2 Side shell primary supporting structure and are to be not less than required by Pt 4, Ch 1, 9 Bulkheads.

8.3.2 Openings in the upper parts of longitudinal bulkheads are to have shapes which minimise stress concentrations and are to be framed to ensure adequate buckling stability.

8.3.3 The difference in thickness between the top strake and the bulkhead plating below is not to exceed 25 mm.

8.4 Support for container corner seats

8.4.1 Where direct support for 20 ft containers by the longitudinal bulkhead is required at the mid length of a cell arranged for 40 ft containers, adequate stiffening is to be fitted in order to ensure the effective transmission of load.

8.4.2 The strength of these arrangements is to be verified in accordance with Pt 3, Ch 14, 4 Ship structure.

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