Episode 11: Stowage planning in the container

Stowing a container does not begin when it is standing in the yard with the rear doors open, but when it is clear that a container is required.

Those involved or affected are not only those who load the container, but also those who develop, design and plan the production of the goods or merchandise in order to have them transported by container.

Standard dimensions

The standard 20ft container has internal dimensions of L x W x H = 5.919 x 2.34 x 2.376 m, although the door dimensions differ. Their width is 2.286 m and the height is 2.277 m. If the load or load carrier is manufactured to fit precisely, this deviation must be taken into account.

The design of machines and systems in particular requires special care. If the system exceeds the container dimensions and is not to be transported as a whole, then the dismantling capability must also be designed.

Lashing points

As it is often not possible to stow systems in a form-fit manner, it is also necessary to check at which points it makes sense to attach attachment points in order to secure them by direct lashing.

Bolt-on lashing points would be a good approach here, because threaded holes are often already present on the machines/equipment for other applications and can be used for the attachment points.

However, the design must confirm their load-bearing capacity.

Congestion plans

The following sketches are not to scale because they are only intended to illustrate the thought processes. The scale is absolutely essential for practical use.

A simple solution is to create a scaled floor plan of the container floor area. The dimensions of the load units can be entered on it and it is easier to see whether and how they fit.

The diagram shows the classic block of five Euro pallets and the gap that inevitably results from the dimensions. You can now consider how the gap should be closed. The elegant method is dunnage bags, others are empty pallets or time-consuming bracing with wood.

In the following congestion plan, three points can be recognized without calculating:

  1. There is a large gap to the door, which requires special measures.
  2. Three gaps need to be closed
  3. The container center of gravity is not centered

By adding up the individual weights, the imbalance can be seen even more clearly.
The above findings lead to the following measures:

  • The pallets are distributed differently depending on their weight, which reduces the weight difference in the container halves.
  • The blocks of five are pulled apart and the door gap is moved inwards.
  • Two stowage cushions approx. 2.20 m long and 0.30 m deep and one stowage cushion 2.20 m long and 0.60 m deep are required

Challenges in load distribution

Some machines or systems stand on feet that are quite small or can be adjusted using screws. As a result, the weight is often distributed over very small areas.

It must be taken into account that the maximum load on the container floor is limited to 5,460 kg (axle load when using a forklift truck). Converting with the wheel contact area gives a value of 19 kg/cm2.

It is therefore necessary to calculate the surface load of the machine/installation and if the result is greater than 19 kg/cm2, plates/wood or similar must be placed under the feet.

The picture shows the floor construction of a container with the cross beams, which are partially bent. The thickness of the floor panels in the gaps is only 26-28 mm.

The substructure for machines/equipment should be large enough to bridge at least two cross beams.

The rows of bolts in the container floor make it easy to locate the floor cross members.

If possible, the contact area enlargement should always overlap at least two cross beams.

This picture shows damage caused by an excessive point load.

Conclusion

The topic of congestion planning is far from over and will be continued in one of the next episodes. The above ideas should be used to check how things work in practice in your own company.

Perhaps one or two people will notice something when they look at the processes through the new glasses.

Yours, Sigurd Ehringer

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Episode 10: Force closure

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