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创建于04.03
How to use webbing slings and round slings to restrain loads?
Webbing slings and round slings are used to safely lift goods and cargo and can be told apart by their appearance: webbing slings are flat, whereas round slings are tubular. Both are indispensable when it comes to lifting loads, but they can also be very useful tools when restraining heavy loads. The question is, though, how can you use slings safely? What do you have to keep in mind and what is the maximum work load limit of a round sling when used to restrain a load?
What are webbing slings and round slings?
As indicated, webbing slings and round slings can be used to lift and restrain loads. The difference between flat webbing slings and round slings is that the latter look like tubular loops. Polyester slings have many advantages over their metal alternatives, such as chains. They weigh less and take up less space, for instance, as well as being easier to maintain and inspect, less dangerous to use, corrosion-resistant and considerably cheaper. Keep in mind that you should always use high-quality, certified polyester round slings that are suitable for professional use.
European standards for lifting equipment
The Machinery Directive 2006/42/EC lays down the requirements that all lifting equipment in Europe must comply with, such as that all lifting equipment must have CE marking. This well-known logo indicates that the product complies with European rules and regulations. Webbing slings must comply with the NEN-EN1492-1:2000 + A1:2008 standard, whereas round slings have to comply with the DIN EN 1492-2:2000 + A1:2008 standard.
Safety factor lifting equipments
All lifting equipment has a safety factor consisting of two digits, with 7:1 and 5:1 being the most common. The minimum breaking load of a sling with a 7:1 safety factor is seven times higher than the load indicated on the sling. In other words, a round sling rated at 2 tonnes should not break until it is subjected to a load of 14 tonnes. Lifting equipment with a 4:1 or 5:1 safety factor is considered so-called one-way lifting equipment, which means it can only be used once before being discarded: once for loading and once for unloading.
Sling colours
You can tell the work load limit of a particular webbing sling or round sling by looking at its colour. This colour-coding system is used worldwide, but it is important to remember that it is not used on all slings. That’s why it’s always important to check the WLL (Work Load Limit) specified on the label, which always takes precedence over the colour of the sling. The colour of the label also indicates the material the sling consists of, with Polyamide (PA) slings featuring a green label, Polyester (PES) slings featuring a blue label and Polypropylene (PP) slings featuring a brown label.
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