What are purpose of Ventilations on ships ?

  • Purpose is to remove heat, moisture, odours and dangerous gases from the compartment. Lack of ventilation can result in large damage claims due to deterioration, sweat, taint or rust damage, and can also cause a dangerous build-up of poisonous and explosive gases.
  • Ventilation may be natural, forced or mechanical.

You may also know rules of hold ventilation :

  • In ventilating practice, the ship officer can collect only limited evidence of hold atmospheric conditions through the use of “wet” and “dry” bulb temperature readings in a few locations in the holds and on the open deck. If there is any circulation of air in the hold it can be assumed that the former will he representative of the overall hold conditions unless the thermometers are placed close to ventilator inlets.
  • Wet and dry bulb readings are taken in a few locations in the holds and on the open deck. From these readings the dew points are obtained. Comparing the dew points of hold air and the outside air enables decisions to he taken as to weather or not to continue ventilating. The following basic rule provides relevant guidance :
  • If the dew point outside is lower or equal to that of the hold dew point
  •   ………… continue ventilation         
  • If the dew point outside is higher than the hold dew point
  • …….. do not ventilate with outside air      


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