Section 1 General requirements

1.1.1 This Chapter covers the requirements for ship piping systems installed in naval ships for the watertight and weathertight integrity of the hull and spaces within the hull.

1.1.2 Consideration will be given to special cases or to arrangements which are equivalent to those required by these Rules. Consideration will also be given to the piping system arrangements of small ships and ships to be assigned class notations for restricted or special services.

1.1.3 Where ship piping systems are required to satisfy requirements for the prevention of pollution, reference is to be made to the applicable requirements for POL and ENV class notations. See Vol 3, Pt 3, Ch 1 Pollution Prevention and Vol 3, Pt 3, Ch 2 Environmental Protection.

1.2.1 At least three copies of the following plans (in diagrammatic form) and a System Design Description containing the additional information are to be submitted for approval. Additional plans should not be submitted unless the arrangements are of a novel or special character affecting classification:

• Arrangements of air pipes and closing appliances to tanks and enclosed spaces.
• Sounding arrangements for all tanks and enclosed spaces.
• Arrangements of level alarms fitted in tanks, machinery spaces and any other spaces.
• Arrangements of any cross-flooding or heeling tank systems.
• Bilge drainage and dewatering arrangements to all compartments which are to include details of location, number and capacity of pumping units on bilge and dewatering service.
• Ballast filling and drainage arrangements. The submission should include a schematic piping drawing showing connection of the ballast water treatment system, where fitted, to the ballast filling and drainage arrangement.
• Tank overflow arrangements.
• Details verifying compliance with the sizing of air pipes required by Vol 2, Pt 7, Ch 2, 10.8 Overflow pipes.
• Details verifying compliance with Vol 2, Pt 7, Ch 2, 10.3 Air pipes 10.3.3 for tanks that can be replenished at sea with design ship movements and filling rates stated.
• Operating manuals and maintenance instructions are to be provided on board and submitted for information where requested by Clasifications Register (hereinafter referred to as 'LR'). The manuals are to include particulars, description, operating instructions and maintenance instructions for all systems.

1.3.1 Precautions are to be taken to prevent progressive flooding between compartments resulting from damage to piping systems. For this purpose, piping systems are to be located inboard of the assumed extent of damage.

1.3.2 Where it is not practicable to locate piping systems as required by Vol 2, Pt 7, Ch 2, 1.3 Prevention of progressive flooding in damage condition 1.3.1, the following precautions are to be taken:

1. Bilge and dewatering suction pipes are to be provided with non-return valves of approved type.

2. Other piping systems are to be provided with shut-off valves capable of being operated from positions accessible in the damage condition, or from above the damage waterline where required by the Rules. These valves are to be located in the compartment containing the open end or in a suitable position such that the compartment may be isolated in the event of damage to the piping system.

1.3.3 Where penetration of watertight divisions by pipes, ducts, trunks or other penetrations is necessary, arrangements are to be made to maintain the watertight integrity.