Safe Stacking of Cargo Containers

Source: Noord-Hollands Dagblad

HAVE THOSE CARGO CONTAINERS BEEN STACKED SAFELY?

The Dutch landscape is increasingly being embellished with 20 and 40 foot cargo containers. These are being used as cheap integrated building structures, poster pillars or even festival stages. Many people do not realise that an empty container is very susceptible to wind. This could be seen in the severe storm of January 18th 2018 in the Netherlands. Wind gusts of 140 km/h flipped over many container stacks in the harbour of Rotterdam.

With this information sheet Stemar Engineering would like to inform all those who are responsible for safely placing stacked cargo containers on building sites, festivals and city centres.

EMPTY CONTAINERS ARE NOT SAFE: USE BALLAST WEIGHT!

In the following table the maximum safe wind speeds are being shown for empty cargo containers. The calculations have been executed in accordance with EN 13782 for temporary structures for stacks that are placed without anchors. The units should be interlocked with twist locks placed on a sturdy surface.

The minimum required ballast weight per container stack is also given to adhere to the required rules for temporary structures.

 

Container Length

20’ STD

40’ HC

Stacking height

2 high

3 high

2 high

3 high

5482 mm

7773 mm

5792 mm

8688 mm

Max. safe windspeed for empty containers

89 km/h

67 km/h

73 km/h

54 km/h

Max. safe wind force for empty containers

9 Bft

7 Bft

7 Bft

6 Bft

Min. ballast required acc. to EN 13782

1.700 kg

9.400 kg

8.300 kg

30.500 kg

 

Please do not hesitate to contact our engineers if you have any questions. 

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