Section 2 General Guidance

2.1 A longitudinal strength and/or stability calculation program is to be capable of carrying out longitudinal strength and/or stability calculations in accordance with the appropriate LR Rules and statutory regulations.

2.2 The program is to incorporate as applicable the following general features:

• when programmed, the ability to assess that, at specified readout points, the still water bending moments and shear forces and, where applicable, the still water torsional moments in any load or ballast condition, do not exceed the permissible values;

• when programmed, the ability to carry out longitudinal strength calculations for those specific aspects as outlined in URS1A;

• when programmed, the ability to carry out stability calculations and to assess compliance with statutory intact and grain stability criteria, as applicable, involving the minimum user intervention and interpretation;

• when programmed, the ability to assess compliance with the applicable statutory damage stability regulations using pre-programmed limiting KG/GM curves OR by carrying out damage stability calculations for final and intermediate stages of the flooding process. See Section Ch 1, 1 Introduction 1.11. (It should be noted that to determine compliance with certain statutory regulations, e.g. IBC Code - International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in BulkAmended by Resolution MEPC.225(64) and IGC Code - International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk Codes (Annex - Guidelines on Interpretation of the IBC Code and the IGC Code and Guidelines for the Uniform Application of the Survival Requirements of the IBC and IGC Codes refers), the use of the constant displacement (lost buoyancy) method is required).

• the ability to provide a print-out of the input and output of the loading condition calculations.

2.3 A flow chart illustrating the Procedure for General Approval is given in Figure 1.7.1 Procedure for General Approval and the Procedure for a Specific Ship Case is given in Figure 1.7.2 Procedure for Specific Ship Case.