Section 1 General arrangement

1.1.1 This Chapter illustrates the general principles to be adopted for the hull structure of Stern First Ice Class Ships.

1.1.2 The general philosophy of this Chapter is to apply the selected ice class Rules with additional consideration for the hull standard load scenarios in Ch 2 Operational and Load Scenarios. The interpretation of this application for the standard scenarios is given in Ch 3, 2 Application of ice class to hull structures.

1.2.1 The applicable requirements of the Rules for Ships or Common Structural Rules are to be complied with, taking into consideration Ch 3, 1.2 Rule references 1.2.2.

1.2.2 Application of the Rules for the following operational cases:

1. Design pressure heads based on hydrodynamic and hydrostatic effects are to be applied to the ship as if it were a conventional ship operating bow first.

2. Rule definitions related to ship hull form (i.e. requirements based on AP and FP locations) are to be considered. For example:

   1. Distances usually measured from FP of a conventional ship may be required to be measured from the AP when going stern first and are to be taken from the centreline of the propulsion unit strut.

   2. Local open water scantlings are to be determined as a conventional bow first ship.

3. Regulatory aspects such as the International Load Line Convention are to be applied to the ship as if it were a conventional ship operating bow first.

1.2.3 The use of ‘forward’ and ‘aft’ in the Rules for Ships (e.g. ‘Forward of 0,1L of the FP’) is to be consistently applied considering the vessel in bow first mode (conventional arrangement) unless otherwise stated. See Figure 1.2.1 Direction-dependent definitions in Chapter 1.

1.2.4 When defining the extents of ice-strengthening for ice class Rule requirements, the intersection of the stern stem with the ice load waterline is to be considered the forward perpendicular for ice class Rule reference purposes.

1.2.5 For loading conditions envisaged to be operated in sheltered water, the permissible still water bending moment and shear force of sheltered water may be applied.

1.3.1 In general, the following approach is to be applied to the interpretation of international conventions:

1. The use of ‘forward’ and ‘aft’ in the Rules for Ships (e.g. ‘Forward of 0,1L of the FP’) is to be consistently applied, considering the vessel in bow first mode (conventional arrangement) unless otherwise stated. See Figure 1.2.1 Direction-dependent definitions in Chapter 1.

2. For navigational related conventions, the use of ‘forward’ and ‘aft’ is also to be applied considering the vessel in the stern first mode.