This is a 2 part article.

Load securing during transportation faces many challenges, especially when dealing with loads that have sharp edges. The sharp edges pose a risk to the integrity of lashing equipment and can potentially lead to accidents, jeopardising the safety of vehicle occupants and other road users. Hence, understanding the potential dangers associated with sharp edges is critical to ensure safe and efficient transportation.

Sharp edges can cause considerable wear and tear on lashing equipment, primarily due to the concentrated stress they can impose on the lashing material. The repetitive bending and flexing of the lashing equipment as it goes over these edges can lead to fatigue, weakening the material and potentially causing failure. This failure can result in a sudden snap, a gradual weakening, or a distortion in the equipment's shape, resulting in a compromised load restraint system and a potential safety hazard.

In this article, we will address the question of what is considered a sharp edge and what measures should be taken to ensure safety when working with such angles.

Australian National Transport Commission and sharp edges

The National Transport Commission (NTC), in its Load Restraint Guide 2018, emphasises the importance of protecting lashing chains from sharp edges. This guide outlines a clear correlation between the sharpness of a corner and the chain's lashing capacity, highlighting the critical need to consider the load's geometry when selecting and using lashing equipment.

As per the guide, the lashing chain should be protected over sharp edges or rough surfaces to maintain its full lashing capacity.

When the corner radius (r) is less than the chain size (d), the chain's lashing capacity is reduced by 25%. The above figure is taken from the Australian Load Restraint Guide 2018.

Understanding the Corner Radius and Chain Diameter

When assessing load-securing options, the radius of the sharp edge should be considered in relation to the degree of flexibility of the lashing equipment. The corner radius (r) refers to the radius of the curve at the corner of the load, while the chain diameter (d) refers to the diameter of the chain link. Understanding the relationship between the two is critical because it influences the choice of lashing equipment.

To ensure safe and effective load securing, the corner radius should always be greater than the chain diameter. This ensures smooth chain movement over the corner without any risk of jamming, kinking, or undue stress. When the corner radius is less than the chain diameter, the chain experiences increased bending stress, leading to potential damage and reduced functionality.

Protective measures must be implemented to reduce the risk when the corner radius is smaller than the chain diameter. Edge protectors are an excellent option because they serve as an intermediary between the chain and the load, preventing direct contact and protecting the chain from premature wear and tear.

To be continued ...

Article copyright to RUD Group. This information is accurate at the time of publication, and RUD Australia takes no responsibility for any errors, inadvertent or otherwise.