4 Advice to Choose a Rigging Sling

We&#;ve read all about how it is extremely crucial for industrial workers to select the right slings when moving a suspended load. Wire rope suppliers churn out the best and the most hi-tech and innovative slings from time to time, with a view of bringing about safe equipment handling and lifting of loads.

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Broadly speaking, the selection of the right sling is based on the following few factors:

• The size of the load
• The weight of the load
• The shape of the load
• The temperature and sensitivity of the material being moved
• Environmental conditions
• Outcome of the visual inspection (This is to be done before each use to ensure safety and effectiveness)

Slings are also used in hoisting equipment. Apart from overloading, incorrect use of hoisting equipment (including slings) may lead to either an accelerated speed or a slowdown.

There are 6 types of slings &#;

1. Chain sling
2. Wire rope
3. Metal mesh
4. Natural fiber rope
5. Synthetic fiber rope
6. Synthetic web

These slings are further classified into 3 categories &#;

1. Chain
2. Wire rope and mesh
3. Fiber rope/ synthetic web

The following pointers may be useful in the selection of the right kind of sling &#;

Chains

The right chain will, typically, be strong, sturdy and devoid of incisions. Before using it, you might want to check it for stretches, scratches, cavities and wear exceeding that which is allowed by the manufacturer. Should you come across any of these signs, you can consider the slings unsafe for use and have them discarded from service immediately.

Alloy steel chains are most commonly used in heavy lifting equipment because not only are they strong, they can also adapt to the shape of the load. Proper care needs to be taken, however, when using chain slings because they are not resistant to sudden shocks, which may lead to a sling failure, damage to the load, and injury to the workers.

Wire Rope

To make a wire rope, a collection of wires is compiled with individual wires twisted together to form strands. These strands are further twisted together, which results in the formation of a wire rope. Wire ropes which are made of fiber strands tend to be more ductile, but are less resistant to adverse environmental conditions. On the other hand, wire ropes made of wire strands are generally associated with greater strength and higher endurance to heat.

Selecting a good quality and long-lasting wire rope entails looking for 4 chief features that make it reliable: strength, wear resistance (bending without distortion), the ability to endure abrasion, and the ability to withstand abuse.

• Strength

To determine the strength of the rope, you need to take its size (diameter), grade, and construction into account. The main purpose of doing so is to ensure that the wire rope is strong enough to bear the maximum applied load.

• Wear Resistance

One of the key factors to consider in wire rope selection is its ability to withstand fatigue. Fatigue failure is caused when small cracks develop in the rope when it is bent at a small radius. The most common method of preventing the occurrence of such cracks is by blocking or padding the wire rope to increase the bend radius.

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• Endurance to Abrasions

This factor is determined by the size and number of wires assembled together to make the rope. It has been observed that smaller wires bend more easily, thereby offering greater flexibility. They do not, however, offer much resistance to abrasions. On the contrary, larger wires are less flexible, but endure abrasions better.

• Withstanding Abuse

This is one of the common causes of rope failure. Misusing or mishandling wire rope slings can bring about serious structural damage which can result in kinks and/or bird caging, which in turn may lead to injuries to those handling the slings. In order to prevent such circumstances and increase the longevity of the sling, it is important to strictly adhere to the safety procedures related to its proper use.

Fiber Rope and Synthetic Web

• Fiber Rope

Fiber rope and synthetic web slings are best for short-term use, for example, work such as construction and painting. They are considered most reliable for handling delicate and expensive loads, especially fragile equipment.

A major drawback of fiber rope slings, however, is that they fail on contact with acids and caustics. Care needs to be taken, therefore, to store these ropes away from such substances. Furthermore, slings should be inspected for cuts, gouges, worn-out surfaces, brittle or discolored fiber, melting, or charring. Should such defects be discovered, the sling should be discarded immediately.

If you want to learn more, please visit our website Rigging Sling.

An important sign to watch out for is the build-up of powder-like sawdust on the inside of the fiber rope, which indicates extreme internal wear. Additionally, if merely scratching the rope fibers with a fingernail causes them to split easily, it implies that the sling has suffered chemical damage. Such ropes are unsafe for use and should be discarded.

(Image credit: http://upload.wikimedia.org/wikipedia/commons/7/7a/Steel_wire_rope.png)

• Synthetic Web Slings

These slings are made of nylon, polyester or polypropylene. They easily adjust themselves around the load and hold it with a snug, anti-slip grip. They can withstand loads of up to 300,000 pounds (depending on their size). They can also absorb heavy shocks without damage and are less likely to scar polished surfaces.  They have low initial costs and are long-lasting as they are unaffected by mildew, decay, or bacteria, can resist chemical action, and have outstanding abrasion resistance.

It is always advisable to adhere to manufacturer&#;s specifications and inspect synthetic web slings before use and remove them from service if found to have suffered burns, melting or charring, snags, tears, or cuts, broken stitches, distorted fittings, or wear or elongation beyond safety.

Conclusion

Proper use and maintenance of a sling can ensure not only its own safety, but also that of those working with it. The above mentioned tips should be helpful in familiarizing you with its important aspects.

Protect the load you&#;re hoisting on a job by understanding the various materials your equipment uses to choose a suitable sling for your rigging application.

Choosing the right sling for your rigging application is vital for protecting the load you&#;re hoisting and keeping workers safe on the job site. The most common slings used for lifting objects are chains, wired ropes, and synthetic materials. Each type of sling is best for different instances. Below we discuss what makes each sling unique and the different variables that go into deciding which one is best for your rig.

Variables That Affect Your Decision

While each sling works better in different environments and with various materials, other variables can affect your decision. Your load&#;s physicality, weight, and center of gravity will help you determine which sling material is the appropriate choice. Furthermore, the environment you&#;re working in and its various weather conditions could also impact your decision.

Chain Slings

A chain is one of the most used and strongest slings to rig materials. Each ring on the chain allows the sling to be more flexible with the load it&#;s hoisting, without taking away from the material&#;s strength or flexibility. Oftentimes, when you are repetitively lifting an object, this is the component to use because it has a longer lifespan and will not deteriorate quickly. Applications you can find chain slings in are foundries, machine shops, steel mills, and other heavy-duty lifting instances.

Wired Rope Slings

Individual strands of wire wrapped around each other make up a wired rope sling. In some components, there may be a steel core within the rope to give additional support for carrying a load. Choose this sling for your rigging application if you need something that can handle extremely heavy weight. You can find wired rope slings in the mining or oil and gas industries, and it also finds use in elevator or crane rope.

Synthetic Material Slings

Synthetic slings are typically made from nylon or polyester materials and are lightweight for handling fragile loads. There are many advantages to nylon web slings, but the most significant is to use this material to hoist fragile loads, so you don&#;t damage them. You must be careful when using this sling because the material will be susceptible to UV rays, heat, and chemicals. Vehicles and yachts are hoisted with this component, but it can also be used in construction and other custom applications.

Using the wrong sling for your rigging application could result in damage to your equipment or the load itself. This could all be avoidable if you take the time before each application to decide on the appropriate material for lifting items. As a rule of thumb, do not use any damaged rigging equipment, or you could compromise the work site or put workers at risk for injuries.

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