Temperature & Humidity in Ocean Containers

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Figure 3: Diagram of Data Recorder Location Typical Conditions A normal shipment consists of three distinct stages. The first stage includes the time from container filling until the container is loaded onto a ship. This includes road transportation and brief periods of storage. Daily cycles of temperature and humidity are common. For example, figure 4 includes temperature swings of 40° F [22°C] during the first stage of a shipment from Japan to Portland. Temperature F and Relative Humidity % 120 110 100 90 80 70 60 50 40 30 20 10-May- 05 15-May- 05 Figure 4: Typical Shipment Japan to Portland Japan Ocean Netherlands 20-May- 05 Temperature Relative Humidity J 25-May- 05 Date 30-May- 05 Ocean Container Temperature and Humidity Study Dave Leinberger – Dimensions.06 Recorder 04-Jun-05 09-Jun-05 48 43 38 33 28 23 18 13 8 3 -2 -7 Temperature C
The second stage is the actual time at sea or aboard a ship. This may or may not be the longest stage during the container’s journey. During this stage, daily cycles of temperature and humidity are usually very minor or completely non-existent. Temperature changes are gradual, often occurring over days rather than hours. Occasionally, a single temperature/ humidity cycle occurs as the ship makes stops along the route, however extreme conditions are rare. Figure 5 includes a slow temperature rise and fall as a winter route takes the ship near the equator and then north to The Netherlands. The final stage begins when the container is removed from the ship and continues until the recorder is removed during the freight unloading process. This may include varying periods of time spent in customs, on trains, on trucks, and in storage. Daily temperature and humidity cycles are common and may be extreme. Temperture F and Relative Humidity % 90 80 70 60 50 40 30 20 Japan Figure 5: Typical Winter Shipment Japan to The Netherlands Temperature Relative Humidity J Ocean 10 -12 01-Dec-05 11-Dec-05 21-Dec-05 31-Dec-05 10-Jan-06 Date Ocean Container Temperature and Humidity Study Dave Leinberger – Dimensions.06 Netherlands 28 23 18 13 8 3 -2 -7 Temperature C
Page 1 and 2: Temperature & Humidity in Ocean Con
Page 3: Seasons Date recording began in Apr
Page 7 and 8: Extreme Conditions: Some of the mos
Page 9 and 10: Effect of Position on Ship: As part
Page 11: Effect of Container Contents: In ou

Temperature & Humidity in Ocean Containers

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