Collier Crane: Alloy Chain Slings--Different Assembly Methods

Collier Crane: Alloy Chain Slings--Different Assembly Methods
10/30/2015 10:46:28 AM
At Collier Crane, we only provide the best crane parts to our customers. We also understand the need for our customers to be properly informed, which is why we want to share our knowledge of different crane parts. Alloy chain slings, for example, are available in many configurations to suit a variety of load lifts. Join us as we discuss the benefits of chain slings, and review the different assembly methods you can take back to use on your projects.

Alloy Chain SlingAbout Alloy Chain Slings

According to F.D. Lake, alloy chain slings have several advantages when compared to other sling types. Alloy slings have high resistance to abrasions and sharp edges. Their durability makes them a common sight in heavy machine shops and steel mills. They’re well suited for harsh environments, and can be heated to temperatures up to 1000 degrees Fahrenheit. Alloy slings can also be easily repaired and recertified. Finally, Safety Sling explains that alloy chain links are specifically recommended for overhead lifting, as they meet the chemical and mechanical property standards set by the government and industry.

There are four basic components of the chain sling: the chain, connecting hook, end hook and master oblong link. We will discuss these in more detail below.

Hook Types 

  • Foundry Hooks: Large throat hooks used in situations that require large openings for load management.
  • Grab Hooks: Small throat hooks that attach to the chain in-between links.
  • Self-Locking Sling Hook: Will automatically lock once pressure is applied and cannot be opened during a lift.
  • Slip Sling Hooks: These throat hooks are mostly used at the end of chain legs. Some available types are also self-locking.

Assembly Methods

US Cargo Control and John Hemsley Ropes & Lifting describe the following chain sling assembly types:

  • Standard Chain Sling: Includes up to four chain legs that connect to the master oblong link. The opposite end of each chain leg has either a hook or another oblong link. The single leg sling is used for lifting in a vertical hitch. Two, three and four leg slings can be set to lift at 45 or 60-degree angles relative to the load.
  • Adjustable Chain Slings: Similar to the standard sling with the addition of up to four grab hooks that link to the legs. This allows the worker to adjust leg length when needed. It’s important to keep all leg lengths the same, as even a slight difference can add a great share of the weight load to the leg with the smallest angle relative to the load.
  • Endless Chain Slings: Includes an endless loop of chain put through the master oblong link. In this instance, there are no legs, and the lifting chain can move freely through the oblong link.
  • Basket Chain Slings: Includes two endless chain links that are individually attached to their own oblong link. The two oblong links are then attached to a master oblong link. The object to be lifted is then placed through the loops created by the links.

Choosing the Best Assembly

Nobles explains that there are several factors that should be considered when deciding an appropriate assembly. Dependent on the type of materials included, load mass will affect the slings and hooks available to handle the job, as each has its own working load limit. While alloy chain slings do have high resistance to environmental conditions, certain conditions can affect sling capabilities. For example, F.D. Lake explains that extreme temperatures can reduce the working load limit. Please note that chain sling companies will provide assembly tables to help in deciding the appropriate components to use with your loads. Apex Hand Tools notes that other factors to consider include overall reach (length from hook attached to the load up to the top of the master oblong link) and sling angle relative to the load.

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