Section 2 Loading Instrument Program

201. Application

1. The requirements of this Section, under approval application, can apply to tests and inspection for the design approval of program (software) to be used for the loading instruments for stability calcu- lation installed in ships according to Pt 1, Ch 1, 307. and 405. of Rules and for loading instrument for longitudinal strength calculation installed in ships according to Pt 3, Ch 3, 104. of the Rules.

2. The approval of program is to be carried out for stability calculation and longitudinal strength or for each.

3. The program approval for stability calculation is to be carried out for intact, grain and damage sta- bility or for each.

4. The requirements in this Section also can apply to the loading instrument program intended for use on shore to calculate several different ships under approval application.

202. Data to be submitted

The following data are to be submitted to the Society in addition to those specified in 102.

(1) The type (or particulars) of applicable loading instrument

(2) Specification of program including kind of use (longitudinal strength, intact stability, damage sta- bility, etc.) and program logic or flow diagram defining calculation process

(3) Operating manual of program

(4) The output of program provided from data of model ships assigned by the Society for the pur- pose of test

203. Requirements

1. System

(1) In principle, loading condition of cargo holds, all tanks comprising part of hull structure and in- dependent tanks are to be able to be input individually.

(2) Input data are to be able to be conformed.

(3) The program is to be capable of printing the calculated results and the items needing review

are to be shown.

(4) The input/output form of the instrument and screen presentation are to be similar to the data of longitudinal strength calculation and stability so that the operators will easily gain familiarity with use of relevant data.

(5) The program is to have graphic function in order to confirm the hull form.

(6) Safety action for doubling loading of container at the same location such as container or over- loading at tank is to be provided.

(7) The system of each program is to be capable of carrying out all calculation by using a linear definition and of preventing mixing of data with data of other programs.

(8) Where software has been developed to carry out only intact stability calculation, a hull form definition may not form the basis of the calculation procedure.

(9) In all cases where software has been developed to additionally carry out damage stability calcu-

lations, a hull form definition is to form the basis of the calculation. Alternatively, where dam- age stability limiting KG/GM data is utilized, the software is to contain sufficient data such that compliance with the relevant damage stability regulations is accurately determined for the vessel in any possible loading condition.

(10) Automatic assessment by the software of the results of the calculations against all criteria is considered essential since assessment by the operator could introduce error and when error of basic condition occurs, alarm is to be indicated.

(11) The test loading conditions are to be permanently stored in computer memory such that acci- dental alteration or deletion by the user or deletion by power surge/failure, is impossible.

(12) Compliance with related requirement is to be confirmed before deciding acceptance of loading

condition.

(13) Code, limited value required by Administration or Classification Rules, minimum value, etc. (for instance, maximum permissible inclining in damaged condition, minimum GZ in intact con- dition, maximum allowable shearing force, bending moment, torsional moment, etc.) are to be

reflected.

2. Longitudinal strength calculation program

(1) At least the following items are to be output.

(A) Displacement

(B) Draughts and trim

(C) Still water shearing force (for ships with longitudinal bulkheads, respective shearing forces acting on the longitudinal bulkheads and shell plating in consideration of local loads)

(D) Still water longitudinal bending moment

(2) In principle, still water shearing forces and longitudinal bending moments at the forward end transverse bulkheads of the machinery space or cargo pump room, collision bulkhead and trans- verse bulkheads located between them are to be output.

(3) In principle, longitudinal still water bending moment is to show the maximum values of hog- ging/sagging moment. However, when maximum values of these have sufficient accuracy, it

need not meet this requirement.

(4) The instrument is to be checked easily in the standard loading conditions.

(5) The calculated values of still water shearing force and longitudinal bending moment at each loading condition are to be compared easily with the still water shearing force specified in load- ing manual of the ship at calculating location or allowable longitudinal still water bending moment.

3. Stability calculation program

The system is to comply with the following requirements.

(1) The numerical/graphic indications of calculation results such as calculation of mass and moment, GM, GZ, area below GZ curve and range of GZ are demonstrated.

(2) The function which may decide compliance of all applicable requirements such as intact, grain

and/or damage stability and minimize work and analysis of the operator is to be provided.

(3) If applicable, damage stability is to be calculated by displacement constant method (bouyancy loss method) and the function which may evaluate damage stability at middle stage of flooding is to be provided.

(4) If there exist applicable requirements not reviewed by instrument, proper measure is to be taken to the operator to recognize that such requirements are to be reviewed by other methods.

(5) Software and supporting data are to be clear and easy for use.

(6) The final test conditions and results of approval test are to be reflected.

(7) All pre-programmed data for applicable ship are to be stored as to avoid accidental alteration or deletion by the user or deletion by power surge/failure.

4. Operating manual

(1) The operating manual for all longitudinal strength and/or stability calculation is to be included.

(2) Onboard operating manual is to be written in familiar language to operator and in case of ships engaged on international voyages and have not English version, English version is to be added. Operating manual is to be expressed generally and clearly and flow diagrams, figure and well expressed illustration are recommended.

(3) Following items are to be clearly noted in operating manual.

(A) Details for check period of instrument

(B) Details for emergency measure against power failure

(C) Output

illustration of expected display on screen (explanation is needed to avoid unfamiliar

output for operator)

204. Tests and inspection

1. Confirmation for accuracy of longitudinal strength calculation program

After confirming that the input & output satisfy the requirements specified in 203. 1 and 2 and the values of still water shearing force and longitudinal bending moment calculated by the Society are to be compared with those obtained by the instrument in proper loading conditions. In this case, the number of loading conditions employed are to be at least four and the error is to be less than

±10 % respectively. Also, in case that the values of still water shearing force and longitudinal bending moment obtained by the instrument are within ± 3 % of the respective values calculated with the method approved by the Society, the comparison may be omitted when the values are deemed adequate by the Society. However, the calculation accuracy may be reasonably considered at points where the absolute values of still water shearing force and longitudinal bending moment are especially small.

2. Stability program

(1) Accuracy between test conditions and output results of stability is to be confirmed.

(2) If applicable, the number and definition of damage cases pre-programmed in software are to be considered adequate in demonstrating compliance with the relevant International Code/Convention or National requirement in any cargo loading condition.

(3) Technical content and format of supporting documentation are to be satisfied.

(4) Results of sensitive test for one or more model ships (carried out by alteration of section mod- ulus used for hull form definition) are to be confirmed.

(5) Saved requirements are to be compared with calculated results.

205. Change of approved program

All changes to the software are to be made by the designer or his representative and the Society informed immediately, since such changes invalidate any certificate issued. The Society may make additional calculations and comparison of results, if necessary.