Section 1 Watertight Bulkheads

101. General

1. All units are to be provided with watertight bulkheads in accordance

3, Ch 14 of Rules for the Classification of Steel Ships and

with the requirements in Pt Ch 14 of Rules for the

Classification of Steel Barges. In the case of column-stabilized units, the scantlings of watertight

flats and bulkheads are to be made of effective to that point necessary to meet the requirements of damage stability.

2. All surface type units are to be provided with a collision bulkhead in accordance with the require- ments in Pt 3, Ch 14, 201. of Rules for the Classification of Steel Ships. However, where openings, etc. are provided on collision bulkhead, the requirements for watertight doors in Pt 3, Ch 14, Sec 4 and Pt 5, Ch 6, 107. of Rules for the Classification of Steel Ships are to be satisfied.

102. Tank boundaries

1. Tight divisions and boundary bulkheads of all tanks are to be constructed in accordance with the requirements in Pt 3, Ch 15 of Rules for the Classification of Steel Ships.

2. Tanks for fresh water or fuel oil, or any other tanks which are not intended to be kept entirely fil- led in service, are to have divisions or deep swashes as may be required to minimize the dynamic stress on the structure.

3. The arrangement of all tanks, together with their intended service and the height of the overflow pipes, is to be clearly indicated on the plans submitted for approval.

4. Each tank is to be tested in accordance with Table 3.1.1 in Pt 3, Ch 1 of Rules for the Classification of Steel Ships.

103. Boundary penetrations

1. Where watertight boundaries are required for damage stability, they are to be made watertight, in- cluding piping, ventilation, shafting, electrical penetrations, and so on. Piping systems and ven- tilation ducts within the extent of damage are to be provided with valves which are capable of be- ing remotely operated from the weather deck, pump room, or other normally manned space, and are to be satisfactorily arranged to preclude the possibility of progressive flooding through the sys- tem to other spaces, in the event of damage. Valve position indicators are to be provided at the remotely operating positions.

2. Notwithstanding the requirements in Par 1, non-watertight ventilation ducts are to be provided with watertight valves at the division boundaries and the valves are to be capable of being operated

from a remote location, with position indicators on the weather deck, or

in a normally manned

space. However, for self-elevating units, ventilating systems which are not used during the transit

condition may be secured by alternative methods approved by the Society.

In this case, necessary

ventilation for closed spaces is to be arranged at the discretion of the Society.