Section 2 General requirements

2.1.1 Specific limitations regarding the application of the Rules are indicated in the various Chapters for differing types of craft.

2.2.1 LR is not concerned with the general arrangement, layout and appearance of the craft; the responsibility for such matters remains with the Builders and/or designers to ensure that the agreed specification is complied with. LR is, however, concerned with the quality of workmanship, and in this respect the acceptance criteria as required by the Rules are to be complied with.

2.3.1 The Rules provide for the basic structural configurations for both single and multi-deck mono and multi-hull craft with single or double bottom arrangements. The structural configuration may also include a single or multiple arrangement of cargo hatch openings and side tanks.

2.3.2 The Rules provide for longitudinal and transverse framing systems.

2.3.3 Novel or other types of framing systems will be considered on the basis of the Rules.

2.4.1 Plans covering the following items are to be submitted:

• Midship sections showing longitudinal and transverse material.
• Profile and decks.
• Deck hatches.
• Bridging structure.
• Shell expansion.
• Laminate schedule.
• Oiltight and watertight bulkheads.
• Propeller brackets.
• Integral tanks.
• Double bottom construction.
• Pillars and girders.
• Aft end construction.
• Engine room construction.
• Engine and thrust seatings.
• Fore end construction.
• Doors, hatches, windows and portlights.
• Deckhouses and superstructures.
• Sternframe.
• Rudder, stock and tiller.
• Anchor and mooring equipment.
• Any special arrangements (e.g. anchor deployment systems, submarine anchor pockets).
• Loading manuals, preliminary and final (where applicable).
• Ice strengthening.
• Welding (where applicable).
• Hull penetration plans.
• Support structure for masts, derrick posts or cranes.
• Bilge keels showing connections and detail design.
• Chain-plates.

2.4.2 The following supporting documents are to be submitted:

• General arrangement.
• Capacity plan.
• Modes of operation for which the craft is designed (speeds corresponding to displacement and non-displacement mode as applicable).
• Lines plan or equivalent.
• Dry-docking plan.
• Towing and mooring arrangements.
• Sail/rigging plan, indicating loadings (as applicable to sailing craft).

2.4.3 The following supporting calculations are to be submitted, see also Pt 8, Ch 1, 2.7 Direct calculations:

• Equipment Number.
• Hull girder still water and dynamic wave bending moment and shear force as applicable.
• Midship section stiffness.
• Structural items in the aft end, midship and fore end regions of the craft.
• Preliminary freeboard calculation.

2.5.1 Details of all the approved and accepted plastics materials, as required by the Rules, are to be submitted on LR's Reinforced Plastic Structures Materials Data Sheet (Form 2075) with the initial submission of plans. Reference is to be made to Pt 8, Ch 2, 2 Materials. The types and quantities of curing systems identified on the Materials Data Sheet are to be those recommended by the resin manufacturer for the approved resin systems.

2.5.2 When specifying materials, the exact manufacturer's type designation, identification and reference numbers are to be quoted.

2.5.3 All sandwich core materials are to be of a type acceptable to LR and are to be clearly identified together with any core bonding adhesive to be used.

2.5.4 Fibre contents by weight for each type of reinforcement are to be reported.

2.5.5 All relevant post curing data is to be documented on the Materials Data Sheet.

2.6.1 Where the proposed construction of any part of the hull or machinery is of novel design, or involves the use of unusual material, or where experience, in the opinion of LR, has not sufficiently justified the principle or mode of application involved, special tests or examinations before and during service may be required. In such cases a suitable notation may be entered in the appropriate Register Book.

2.7.1 Direct calculations may be specifically required by the Rules and may be required for craft having novel design features or in support of alternative arrangements and scantlings. LR may, when requested, undertake calculations on behalf of the designers and make recommendations in regard to suitability of any required model tests.

2.7.2 Where direct calculations are proposed then the requirements of Pt 3, Ch 1, 2 Direct calculations are, in general, to be complied with.

2.8.1 Craft of unusual form, proportions or speed, intended for the carriage of special cargoes, not covered specifically by the Rules, will receive individual consideration based on the general requirements of the Rules.

2.9.1 The Rules do not cover certain technical characteristics, such as stability, except as mentioned in Pt 1, Ch 2, 1.1 General 1.1.11 and Pt 1, Ch 2, 1.1 General 1.1.13 , trim, vibration, docking arrangements, etc. The Committee cannot assume responsibility for these matters but is willing to advise upon them on request.