What are contents of Grain Stability Manual ?

Contents of grain stability are as follow :

  1. INSTRUCTION TO THE MASTER
  2. MAIN PARTICULARS
  3. DEFINITIONS AND CONVERSION TABLE
  4. NOTES REGARDING GRAIN STABILITY CALCULATION
    • 4.1 Stability in general
    • 4.2 Definition on grain
    • 4.3 Grain heeling moments
    • 4.4 Max. allowable heeling moments
  5. WORKING EXAMPLE
    • 5.1 How to check the stability of the vessel
  6. TANK AND CAPACITY INFORMATION
  7. LOADING CONDITIONS
  8. GRAIN SHIFTING MOMENTS FOR CARGO HOLDS
  9. MAX. ALLOWABLE GRAIN HEELING MOMENT
  10. EXTRA CALCULATION SHEETS
You may also know definition of grain  and grain heeling moment  :

The word “grain” is intended to included wheat, maize, rye, barley, rice, pulses (seeds from pods, e.g. peas and beans), seeds and processed forms thereof whose behavior is similar to that of grain in its natural state.

Grain heeling moments

The stability calculations are based on the assumption that the centre of gravity in a filled compartment is at the volumetric centre of the whole cargo space.

In the stowage arrangements covered by this Manual a filled compartment means any compartment which after loading and trimming is filled with bulk grain to the maximum possible extent, i.e. to the top of the hatch coaming.

All necessary and reasonable trimming shall be performed to minimise the effect of grain shifting.

For partly filled holds the adverse effect of the vertical shift of grain surface is taken into account by an addition of 12% and for filled holds the adverse effect of the vertical shift of grain surface is taken into account by an addition of 0%.

All additional is incorporated in the presented shifting moments. The table is presented with ullage reference from the top of the hatch coaming and/or height reference above the tank top.

manish-mayank

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