What is Cargo Ventilation and its types?

Cargo ventilation:

• Ventilation to the holds may be:
• Mechanical or forced draft ventilation – where fans which can normally run in both directions are provided
• Natural ventilation – where ventilation results from the natural movement of air caused by the wind blowing, the ship’s motion, or the circulation of air resulting from temperature differences.

Purpose of  ventilation :

Bulk cargoes are ventilated:

• To prevent the formation of cargo sweat or ship’s sweat which could damage the cargo such as for grain and steel
• To reduce the harmful heating of the cargo such as for grain and coal
• To remove hazardous gases such as for coal
• To remove moist air and replace it with drier air to discourage the formation of sweat