Lifting sling
Contents |
[edit] Introduction
A lifting sling is used with a lifting device or crane to lift objects effectively and safely. Slings usually consist of cable, chain, rope or webbing, and generally include metal devices such as hooks, shackles, links or rings. Different types of sling are appropriate for different applications, depending on their composition, working load, length, slinging mode and so on.
[edit] Types of sling
[edit] Nylon
Nylon slings are strong, dense and flexible; they will stretch by approximately 6-8% of their length. However, nylon can absorb liquid, which can affect its strenght.
[edit] Polyester
Polyester slings are are known as 'web slings' or 'rigging slings' because of their synthetic, web-like composition. Polyester differs from nylon in that its stretch is approximately 3%, and it is safe for use where bleaching agents or acids are present.
[edit] Wire rope
Wire ropes are categorised based on the number of wires in a strand and how many strands are wrapped around the core. The more wires there are, the greater the flexibility and resistance to kinks, but also the more liable they are to abrasion wear.
[edit] Chain
Chain slings are typically suited to more demanding lifting operations. They are usually constructed from Grade 80 or 100 high strength alloy steel and can be designed and fitted to create custom sling assemblies for almost any kind of lift.
Chain slings should be stored in a dry and clean area to avoid damage, rust and corrosion. They should be regularly inspected for defects, including:
- Wear and stretching.
- Bent or twisted links.
- Ineffective safety catches.
- Cuts and nicks.
- Gouges.
- Heat discolouration and welding splatter.
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