Section 9 Bulkheads

9.1.1 For watertight and deep tank bulkheads, including the engine room bulkhead at the after end of the after cargo hold and the after peak bulkhead, the requirements of Pt 4, Ch 1, 9 Bulkheads of the Rules for Ships will apply.

9.1.2 The corrosion allowance, to be added to the plating criteria in Table 1.9.1 Watertight and deep tank bulkhead scantlings of the Rules for Ships, for deep tank bulkheads is to be 1,5 mm.

9.2.1 The requirements of Pt 3, Ch 3, 4.1 Number and disposition of bulkheads 4.1.1 of the Rules for Ships are to be complied with, except that the transverse bulkheads in the cargo holds may be dispensed with.

9.3.1 The collision bulkhead is to be positioned approximately 0,04 L _L aft of the fore end of L _L (with L _L as defined in Pt 3, Ch 1, 6.1 Principal particulars 6.1.8 of the Rules and Regulations for the Classification of Ships, July 2022). Other equivalent locations may be individually considered.

9.3.2 The scantlings are to comply with the requirements of Pt 4, Ch 1, 9 Bulkheads of the Rules and Regulations for the Classification of Ships, July 2022, except that the thickness of plating and modulus of stiffeners are to be not less than 12 per cent greater and 25 per cent greater, respectively, than would be required for a dry space.

9.3.3 Doors, manholes, permanent access openings or ventilation ducts are not to be cut in the collision bulkhead below the freeboard deck, see also Pt 5, Ch 13, 3 Drainage of compartments, other than machinery spaces of the Rules for Ships. The number of openings in collision bulkheads above the freeboard deck is to be kept to a minimum compatible with the design and proper working of the ship. All such openings are to be fitted with means of closing to weathertight standards.

9.4.1 The number and location of screen bulkheads to be fitted are to satisfy the operational requirements of the ship.

9.4.2 These requirements apply to the non-watertight, transverse, screen bulkheads, in the cargo holds, which are loaded homogeneously on both sides with cargo.

9.4.3 The definition of a screen bulkhead is given in Ch 4, 1.4 Definitions 1.4.2.

9.4.4 The requirements of this Chapter apply to a vertical system of stiffening on screen bulkheads. They may also be applied to a horizontal system of stiffening or a combination, provided that equivalent end support and alignment are provided, see Figure 4.1.5 Typical screen bulkhead, with no self-unloading equipment fitted and Figure 4.1.6 Typical screen bulkhead, with self-unloading equipment fitted.

9.4.5 Where screen bulkheads are designed to withstand non-uniform cargo loading, the scantlings and arrangements will be specially considered.

9.4.6 The minimum plating requirements are to comply with the bulkhead requirements, as stated in Table 1.9.1 Watertight and deep tank bulkhead scantlings of the Rules for Ships. Minimum thickness is to be 12,0 mm in lower part and 9,5 mm in upper.

9.4.7 The minimum stiffening requirements of Table 1.9.1 Watertight and deep tank bulkhead scantlings of the Rules for Ships for watertight bulkheads are to be complied with, the load head h₄, being restricted to 0,5 h₄.