Section 5 Shell envelope plating

5.1.1 The requirements of Pt 4, Ch 1, 5 Shell envelope plating of the Rules for Ships, are to be applied together with the requirements of this Chapter.

5.1.2 The bottom shell is to be longitudinally framed except in way of the wing tanks, where the plating may be transversely framed. Longitudinal or transverse framing may be adopted at the side shell except in way of the upper part, where longitudinal framing is to be adopted.

5.1.3 The maximum wave head, (C_wL) as per Table 1.5.2 Bottom shell and bilge plating and Table 1.5.3 Side shell plating of the Rules and Regulations for the Classification of Ships, July 2022 is 0,5 C_w.

5.1.4 Where bilge keels are fitted, the requirements of Pt 3, Ch 10, 5.6 Bilge keels and ground bars of the Rules for Ships are to apply.

5.1.5 Where rubbing bars are fitted, the quality of the welding is to be equivalent to that of the main structure, and the grade of material is to be similar to that of the shell plating in way. Where longitudinal rubbing bars are discontinuous throughout the ship’s length, the ends of each section are to be radiused and chamfered and extend over an internal stiffening member. Direct connection between the rubbing bar butt weld and the shell plating is to be avoided.

5.1.6 It is recommended that the side shell plating be increased in thickness at the forward and aft shoulders of the ship, to accommodate contact with Seaway Locks and to resist ice damage.

5.2.1 The thickness of the keel plate may be as per the thickness of the adjacent bottom shell plating.

5.3.1 The thickness of the bottom and bilge shell plating is to be not less than the minimum values given in Table 1.5.2 Bottom shell and bilge plating of the Rules and Regulations for the Classification of Ships, July 2022 using C_wL as per Ch 4, 5.1 General 5.1.3.

5.4.1 The midship thickness of the side shell and sheerstrake plating is to be not less than the minimum values given in Table 1.5.3 Side shell plating of the Rules and Regulations for the Classification of Ships, July 2022 using C_wL as per Ch 4, 5.1 General 5.1.3.

5.4.2 The midship thickness of the side shell and sheerstrake plating, per 5,4.1, is to be maintained as per Pt 3, Ch 4, 7.1 Application 7.1.2 of the Rules for Ships.