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Not shown is the rare, but also possible combination of a 30-foot container coupled to a 10-foot box, in a 40(+) foot long stack. The ISO 668 standard firstly classifies containers by their length in whole feet for their 'common names', despite all measurement units used being either metric (SI) or officially based on the metric system.
Intermodal containers exist in many types and standardized sizes, but 90 percent of the global container fleet are "dry freight" or "general purpose" containers: [2] [5] durable closed rectangular boxes, made of rust-retardant weathering steel; almost all 8 feet (2.44 m) wide, and of either 20 or 40 feet (6.10 or 12.19 m) standard length, as ...
The reason the smaller container is 1.5 inches (3.8 cm) short of 20 feet is to allow it to be stacked efficiently with 40-foot containers. The twistlocks on a ship are set so that two standard 20-foot containers have a gap of 3 inches (7.6 cm), allowing a single 40-foot container to fit precisely on top.
The exact capacity varies by manufacturer, purpose, or other factors. Standard drums have inside dimensions of 572 millimetres (22.5 in) diameter and 851 millimetres (33.5 in) height. These dimensions yield a volume of about 218.7 litres (57.8 US gal; 48.1 imp gal), but they are commonly filled to about 200 litres.
A flat rack container is a shipping container with two end walls, but without side walls and roof. Some flat racks can also be equipped with pillars. Flat rack containers are also available as stake containers with and without end walls. [1] There are flat racks in the standard sizes 20′ or 40′, and also in the dimensions of high cube ...
By contrast a 40-foot container is 12.2×2.7×2.4 m (40.0×8.9×7.9 ft) and can carry 26.5 metric tons (26.1 long tons; 29.2 short tons) of cargo. The benefit is that their larger capacity reduces the number of containers needed, and therefore their handling cost.
Containers usually come in standard depths of 20 mm, 40 mm, 65 mm, 100 mm, 150 mm, 200 mm. [5] Drain lids and lids with cut-outs such that a serving utensil can be placed into the container are common accessories. They are made in these sizes especially for the catering industry.
Specialized shipping containers include: high cube containers (providing an extra 1 ft (305 mm) in height to standard shipping containers), pallet wides, open tops, side loaders, double door or tunnel-tainers, and temperature controlled containers. Another specialized container, known as Transtainer, is a portable fuel and oil freight container.