Section 2 Appraisal of Test Conditions for Longitudinal Strength Aspects

2.1 In order that check calculations may be carried out, the minimum data required to be submitted to the ship plan approval office is as follows:

• Ship profile, main dimensions and hydrostatic data;
• Ship lightweight, numerical lightweight distribution and LCG;
• Lines plan and/or offset table data, OR, Bonjean data at 21 stations in the length BP for, a minimum of seven waterlines at suitable spacing together with Bonjean data at the ends of the hull outside the fore and aft perpendiculars;
• Compartment definition, including Aft and Fwd boundaries, Lcg & Tcg indicating variation with fill height;
• Tank Calibration tables;
• Specification of Moon Pools if applicable;
• For flooding calculations, the cargo permeability, hold volume tables and cargo density,
• Where applicable the local strength diagram limits as programmed into the instrument;
• Deadweight definition for each loading condition;
• Approved trim and stability book (where approval has not been carried out by LR)
• Shear Force, Bending Moment and Cargo Torque limits programmed into the instrument.
• Shear force correction factors used. It should be noted that for specific ships which have transferred Class, it may be necessary for the method of application of the factors to be different from LR’s current procedure;
• Frame spacing table;
• Where possible a capacity plan.

2.2 The number and location of readout points are to be specified by LR. Readout points are to be selected at positions of transverse bulkheads or other obvious boundaries, and additional points (midhold) are to be included as necessary. The spacing of readout points is generally to be not more than 5% (five percent) ‘L’ unless the program calculates and displays maximum values between readout points. For these calculations downward loads are to be taken as positive values and are to be integrated in a forward direction from the aft end of ‘L’. The shear force is positive when the algebraic sum of all vertical forces aft of the section is positive.

2.3 The permissible still water shear force (SWSF) and still water bending moment (SWBM) values, together with transverse bulkhead shear force correction factors and cargo torque limits, where applicable, will be supplied to the program supplier by the appropriate Plan Approval Office. Floodable permissibles will also be provided where applicable.

2.4 A comparison of results would be expected to be within ±2% of the respective assigned permissible at each readout point but in no case should this exceed ±5%. If unexplained differences occur, the supplier will be required to investigate those discrepancies and advise LR.