|7.4 Trends in the size of integral containers|
|Table 5 shows the relative quantities of all containers with regard to their various dimensions. The largest growth today can be observed in the 40' high cube containers (9' 6" high). In future, they will replace the normal 8' 6" high 40' containers. 20' containers, however, are still needed to transport heavy cargo such as meat and fish, since a 40' container fully loaded with these goods would exceed the 30t weight limit.
Converting TEU to a number of containers where 40' container = 2 TEU
Integral other includes 43' containers from Chiquita, for instance
Source: World Container Censuses
Table 5: Trends in the proportion of different refrigerated container sizes from 1992 to 1998
It is also interesting to look at the actual number of containers, which amounted to 408,777 in 1996. According to table 2, 47.41 million tons of refrigerated cargo were transported by sea in the same year. If it is assumed that approximately 50% of these goods were transported in containers, and that the average weight of a container cargo is 20 t, this means there are a total of 1.185 million transport operations per year. This means an average of 2.9 transport operations per year per container. There are of course large variations depending on the owner and the trade route. Banana companies, who mainly transport their bananas to North America in refrigerated containers, make approximately twelve to fifteen trips per year. The annual frequency with which the major container shipping companies use "normal" refrigerated containers must be reduced accordingly, meaning that an average of around two trips per year can be expected.
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