Cargo Sweat
Cargo Sweat occurs when the surface of the
cargo is cooler than the dew point (condensation point) of
the air in the container. Droplets of water then form on the
surface of the cargo. This occurs when moving cargo from a
cold or temperate climate to a tropical one. The air and cargo
containing the moisture or watervapour condenses on the cargo
or its packaging.
For example:- A cargo of canned goods is
loaded in winter conditions in Europe and transported to the
tropical belt. The container will gradually heat up during
transit to the warmer, moist climate. The cargo temperature
will also heat up gradually, but lag behind the temperature
increase of the container itself.
if ventilation was allowed to take place
the warm moist air from outside the container would condense
on the cold cargo. in this case it is better to avoid ventilation
during transit and allow the cargo temperature to gradually
increase thereby restoring equilibrium between the cargo temperature
and the outside air.
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