The gastightness of a container is crucial to a successful use of CA. The oxygen content can still be reduced in leaky containers if enough nitrogen is added, but the energy available for nitrogen production is limited (15 kW for the refrigeration unit and the nitrogen production together). It is also impossible to work with increased CO2 content in leaky containers, since the large volumes of nitrogen involved drive the carbon dioxide produced by the goods out of the container. Thus, it is essential that the containers are sufficiently airtight before they are used in CA transportation.
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