Question 213General Subjects - 1st Asst/Chief

70% to pass

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?

AThe dew point temperature of the cargo hold is normally maintained at the surface temperature of the cargo or ship structure.

BThe dew point temperature of the cargo hold is normally maintained 10oF above the surface temperature of the cargo or ship structure.

CThe dew point temperature of the cargo hold is normally maintained 10oF below the surface temperature of the cargo or ship structure.

DThe dew point temperature of the cargo hold is normally maintained at a constant temperature regardless of the surface temperature of the cargo or ship structure.

AI Explanation

The correct answer is C) The dew point temperature of the cargo hold is normally maintained 10°F below the surface temperature of the cargo or ship structure. This is because maintaining the dew point temperature 10°F below the surface temperature prevents moisture condensation on the cargo or ship structure. Condensation can lead to damage of dry cargoes, so the ventilation and dehumidification systems are designed to keep the dew point lower than the surface temperature. The other options are incorrect because maintaining the dew point at the surface temperature (A) or 10°F above it (B) would allow condensation to occur, and maintaining a constant dew point regardless of surface temperature (D) would not effectively prevent condensation in all situations.

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