This blog post is part of a new feature on AWRF where our members provide valuable insight into the industry.
Mishandling of workplace materials is the single largest cause of accidents in the workplace. Fortunately, most of these accidents are avoidable. With wire rope slings playing an important role with cranes, derricks, and hoists, it’s important to understand how to make a proper selection.
Wire rope can be prone to fray easily at the ends making it difficult to connect to equipment. Wire rope fittings or wire rope terminations are used to secure the ends of wire rope and prevent fraying. There are many different types, sizes and finishes of wire rope fittings which are suitable for most types of rope. Some of the more common types of wire rope fittings are detailed below.
Wire Rope Thimbles
A wire rope thimble is used in wire rope assemblies to prevent the wire rope eye from being crushed and reducing wear on the rope itself. When a wire rope assembly is fitted with an eye at the end, a thimble is inserted to form the eye of the loop before the rope is secured in the ferrule or wire rope grip.
Wire Rope GripsSteel wire rope is several strands of metal wire twisted into a helix forming a composite “rope”, in a pattern known as “laid rope”. Larger diameter wire rope consists of multiple strands of such laid rope in a pattern known as “cable laid”.
In stricter senses the term “steel wire rope” refers to diameter larger than 3/8 inch (9.52 mm), with smaller gauges designated cable or cords. Initially wrought iron wires were used, but today steel is the main material used for wire ropes.
Wire Rope Inspections ENManufacturing companies choose to use Dyneema rope over steel wire rope for heavy lifting applications such as heavy lift slings, crane rope, and other rigging operations because Dyneema rope:
Is 15x stronger than steel wire rope
Has a recoil force that is considerably less than steel wire rope
Has an abrasion lifetime that is 4x longer than steel wire rope
Is 7x lighter than steel wire rope at the same strengthPVC-coated wire rope, nylon-coated wire rope, or no coating at all? Unsure about which of these is appropriate for your application? Read on and find out.
Coated wire rope has a plastic or nylon coating which enhances the rope’s resistance to both corrosion and wear-and-tear. It also provides a soft protective shield for stainless steel and galvanized wire ropes. Nylon is hard wearing, that is, very abrasion resistant and mostly immune to peeling.
COATED WIRE COLOURS
Manufacturers produce coated wire rope in a variety of colours but the most popular being white, black, and clear. Perhaps due to practical aesthetics, neutral colours blend more easily into the background. Coated wires can appear invisible or non-existent from a reasonable distance, making it popular choice for rigging and suspension applications in many industries.
COATED WIRE APPLICATIONS