There is a reason whyĀ industrialĀ lifting slingsĀ are popular for lifting heavy loadsĀ in industries like construction, oil and gas, steel mills, and automobile. Donāt let their simple design fool you. They offer unparallel safety, flexibility, and longevity. From giant windmills to containers,Ā chain slingsĀ can be used to lift just about anything.
However, you will need to choose the right type ofĀ industrialĀ chain slingsĀ to ensure safety and efficiency. Before we get into what you should consider when selectingĀ alloyĀ chains, letās see whatĀ type of slingsĀ you can use.
UnlikeĀ synthetic slings,Ā chain slingsĀ are made from high-quality metal alloys, usually steel. They can withstand extreme temperatures, impact, chemicals, and UV light. Thanks to their durability and flexibility, you can use industrialĀ lifting slingsĀ in manufacturing, foundries, oil and gas extraction, steel mills, and other severe work environments.
There are three common types of slings, based on the number of alloy chain legs.
As the name suggests, single-leg alloyĀ chain slingsĀ consist of only one chain supporting the load. Thatās why these chains are more suitable for lifting evenly distributed loads. They are commonly used in foundries and manufacturing plants.
Double-leg alloyĀ chain slingsĀ come with two strands of chains. The two separate links provide better support to the attached load. SomeĀ sling manufacturersĀ also offer adjustable double-leg slings. They render more flexibility when liftingĀ heavy loads.
Multi-leg alloyĀ chain slingsĀ have three or four links. They are the strongest ofĀ alloy chains, having the capacity toĀ lift extremelyĀ heavy loads. You can find them in all types of heavy industries.
The flexibility and durability allow you to useĀ chain slingsĀ for vertical, choker, or basket hitches. You can use different variations of master links, slings, and hooks, to buildĀ lifting and riggingĀ assemblies as required.
But, as strong as they come, these slings do have limitations. Moreover, liftingĀ heavy loadsĀ is a dangerous task that can lead to serious injuries should things go south. So, you have to be very careful whenĀ selecting a chain sling.
Hereās what you mustnāt forget.
First, you need to understand what the intended load is and how you want to lift it. Itāll help you plan the entireĀ lifting and riggingĀ operation to a tee. So, start digging into the shape, size, strength, and weight of the load. The more details you can get, the better.
The center of gravity of the load is a crucial factor. If you know the center of gravity, arranging the slings and otherĀ lifting devicesĀ becomes a lot easier.
As a cardinal rule, the master link or the hook (connected to the crane orĀ hoist) should be directly over the center of gravity. Otherwise, the load will be out of balance, resulting in accidents and/or injuries. Most likely, you will have to adjust the load repeatedly until you can find its center of gravity.
In addition to the center of gravity, you need to know how to attach the load to theĀ lifting devices. MostĀ heavy loads, such as containers, come with lifting points.
But, when lifting points are absent, you have to consider where you can attach the slings. Firstly, the lifting points you select must be strong enough to bear the weight of the load.
Secondly, if the load is delicate, choosingĀ synthetic slingsĀ that you can wrap around it is a good idea. Itās the best way to protect the load from excruciating pressureĀ alloy chainsĀ would put on it during the lift.
Make sure to choose suitable slings depending on your load, lifting environment, and the type of chains you are using.
Selecting the right grade is equally important. Carbon steel chains have lower grades (usually 30, 40, and 70), which are not suited for overheadĀ lifting and rigging. But, you can use them for tying down and bundling loads.
However, steelĀ alloy chainsĀ have higher grades, most common being 80, 100, 120. BothĀ OSHAĀ andĀ ASMEĀ recommend these grades for overhead lifting applications.
Moreover, selecting the right grade can increase your lifting efficiency and reduce the risk of accidents. While you can use a thicker Grade 80 chain, a Grade 100 but thinner chain will be easy to use. In other words, you need to get a grip on alloy chain grades.
You can use alloyĀ chain slings for liftingĀ loads at high temperatures. They can withstand temperatures up to 1000Ā° Fahrenheit. However, continuously exposing these chains to high temperatures (more than 400Ā° Fahrenheit) will affect their strength.
Sling manufacturersĀ often recommend decreasing the working load limits in such conditions. Make sure to check the user manual for manufacturerās instructions in this regard.
You will need to check theĀ working load limitĀ (WLL) of each chain sling. You must never exceed the recommended WLL. Different factors will affect the WLL of a chain sling. These include but are not limited to:
Lastly, you must inspect each alloy chain daily or before using it. Usually, a visual inspection is enough to know whether the chain is safe to use. Assign a qualified person for the same.
During the daily inspection, look for:
Furthermore, check the identification tag, which bears the serial number, manufacturerās details, size, grade, and working load limit. It should be legible. If the tag is missing or illegible, either replace it or stop using theĀ chain slings.
In addition to the regular inspection, you also need to perform documented periodicĀ chain sling inspectionsĀ by an expert. Depending on the frequency of use and work environment, you can check the chains:
Alloy chains are an integral part of lifting heavy loads. However, as your safety and efficiency are at stake, you will have to consider a few things before using them. With these tips, you will be able to choose the right chains for your project.
If you are looking forĀ industrial lifting devices, HHI can help. We offer a wide range of rigging and lifting hardware for clients across industries. Feel free toĀ reach out to usĀ or check out our online store today!