What is sweat in cargo hold?

When air moisture settles on the cargo, it is referred to as 'cargo sweat'. Condensation on the ship's structural elements inside the cargo hold is called 'ship sweat'. Both phenomena are directly related to the dew point, the temperature at which air becomes saturated with water, triggering condensation.



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For ship sweat to occur, the dew point in the cargo hold must exceed the temperature of the ship's structure. To eliminate ship sweat, the cargo should be ventilated if the ship is moving from a warm to a cold climate.

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Insulating your shipping container can greatly reduce the amount of moisture in the air and prevent container rain. Container insulation can keep the contents of your cargo warmer than the dew point, preventing the extreme temperature differences that lead to condensation.

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Cargo sweat – Cargo sweat is condensation which forms on the cargo. It occurs when the temperature of the cargo is less than the dew point of the air in the hold. The cargo cools the air in contact with it and condensation forms on the cargo. The cargo may therefore be damaged by direct contact with moisture.

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The right ship captain can help protect your cargo if the vessel gets caught in a storm. “A canny captain will navigate his vessel to the “low side” of the storm, usually the side anti-clockwise from its leading edge, where wind speeds will be lower and waves will be shallower,” said the UK Chamber of Shipping.

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Many are surprised to hear that the cargo hold in the belly of an airliner is pressurized. Conditioned air is directed from the cabin, so the air tends to be a little cooler by the time it reaches the cargo areas, which are also less insulated than the cabin. Cargo temperatures vary in our fleet.

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The co2 is released by opening appropriate valve for the hold after confirmation and discussion with the captain of the vessel or ship.

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Hold preparation may include several steps including dry sweep, removal of previous cargo residues, freshwater rinse as well as final inspection. Ventilation is often overlooked but in fact, it the easiest and most effective way to ensure your cargo's integrity throughout the voyage.

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