Section 5 Primary members supporting non-oiltight bulkheads

5.1.1 These requirements are applicable to primary members supporting non-oiltight transverse bulkheads. Where non-oiltight longitudinal bulkheads are proposed, the requirements for the primary members will be individually considered.

5.1.2 The minimum thickness and constructional detail requirements of Pt 4, Ch 10, 7 Construction details and minimum thickness are to be complied with.

5.2.1 The symbol, l _b, used in this Section is defined as follows:

5.2.2 Other symbols are defined in Pt 4, Ch 9, 1.6 Information required for CSR Double Hull Oil Tankers.

5.3.1 Direct calculation procedures will generally be required where the non-oiltight bulkhead primary members will interact with, or tend to support, the primary bottom, longitudinal bulkhead or side structure, and in other cases where warranted by structural design features.

5.4.1 The section modulus of vertical webs is to be not less than that required for a vertical web on an oiltight transverse bulkhead in the same position, see Pt 4, Ch 10, 4 Primary members supporting oiltight bulkheads, multiplied by the factor .

5.4.2 The section modulus of horizontal girders is to be not less than:

5.4.3 When determining the width of plating supported and the effective breadth for calculating the section modulus, no deduction is to be made on account of perforations.