Outline the purpose of a shipboard stress finding system including details of the input data
and the output obtained.
INPUT DATA:
1. Weights for individual compartment fed in manually – SF for bulk cargoes.
2. In case of liquid cargo, the volume or ullage and density is fed.
3. Other details including bunkers, FW and ballast onboard, stores and constant.
4. Density of water in which vessel is floating.
5. Maximum limiting draught where applicable.
6. Load line zone.
OUTPUT DATA:
1. Vessel’s displacement with summary of weight distribution.
2. Vessel’s DWT and FSM.
3. Hydrostatic data, draught, trim, list, KG, KM, GM, GZ curve and dynamical stability.
4. SF and BM’s and torsional stresses. Maximum allowed and actual at each stations both in
seagoing and harbour conditions.
5. Heel. Grain loading assesment.
6. Local load assesment (container slack weight).
PURPOSE:
¨ The data obtained may be stored for future storage requirement.
¨ Various condition (storage plan) may be available for quick refrence to most suitable
condition
¨ Output info. Can be checked immediately for compliance with load line regs. without delay
PURPOSE OF A SHIPBOARD STRESS FINDING SYSTEM:
1. The distribution of the wt. onboard must be controlled to avoid any stresses & bending
mom.
2. Mathematical calculations of these (BM&STRESSES) are lengthy & tedious with the
possibility of clerical errors.
3. For any change of plan the entire range of stresses will have to be recalculated.
4. Any proposal plan can be checked readily for stress.
5. Any modification to previous plan can be done immediately till a satisfactory cond. is
achieved
6. All stress finding instruments are made ship specific & all ship’s data is preprogrammed.
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