To prevent damage to dry cargoes, the cargo hold ventilation and dehumidification systems play a key role. In terms of the maintained dew point, what statement is true?

Correct Answer: Option C — The dew point temperature of the cargo hold is normally maintained 10F below the surface temperature of the cargo or ship structure.

Maintaining the cargo hold dew point at least 10°F below the cargo or ship structure surface temperature prevents condensation. By keeping the air dew point lower than the surface temperature, the system ensures that moisture in the air does not reach its saturation point upon contact with cold surfaces, preventing cargo sweat.