Friction is a magic word in transport engineering.For some it means saving money on lashing & securing. For others, it means to create additional safety for cargo. When is friction used? How is it used?

Friction included or excluded in lashing calculations?

By Bart van Dijck

Friction is a magic word in transport engineering. For some it means saving money on lashing & securing. For others, it means to create additional safety for cargo. When is friction used? How is it used?

We all know what the coefficient of friction will be when using steel on timber, or steel on steel etc. Some rubber mats manufacturers state they have mats which could create a coefficient of 0,8g. Amazing… No more lashing and securing for shear forces!

For some reason, many people think that when we use DNV for acceleration calculations, it’s always 0g friction. When you ask them why, they state that it is always like this. Using zero friction for a load-out is done when steel-steel was used in UAE in some load-outs long ago, because there was almost no timber available so zero friction was used. That’s the reason people thought it should always be like this for DNV.

As we know that class approved load-outs often dictate the amount of friction allowed to be used, it still results many times in extensive over-lashing and securing. In the end, someone has to pay for this, which minimizes the profit on a load-out. If margins disappear, there will be no money earned to educate people what it is all about. No education means not knowing, means more and more regulations and rules laid up by other elements in this maritime chain of events.

Lashing & securingLashing calculations

Newsletter

Stay up to speed