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SpinDistribute.com Article Directory

The following article was published in our article directory on September 2, 2011.
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Keep it Safe: When Choosing your Lifting Chain

Article Category: Advice

Author Name: Emma Louise

Lifting chains were invented in order to lift huge and heavy objects from one location to another. For example; an object from a haulage lorry back into a workshop or vice versa. The object being lifted will be suspended in the air for a short period of time by the lifting chain, and if it breaks, gravity will pull the heavy object down. The resulting force is massive, thus, can cause lots of damage, or worse, injuries or death to people. It is because of this reason that customers should be careful when choosing their lifting chains.

The process of selecting the best lifting chain is not overly hard - owing to the various specifications that are governed by standards devised by governments and other organizations such as the American Society of Mechanical Engineers and the National Association of Chain Manufacturers. A chain used for lifting should be chosen based on, both the load it will be carrying and the environment where it will be used.

Customers trying to find a lifting chain to suit their needs can conveniently locate the information about the product on its identification tag and certificate. The customer should take great care when reading this. Information on the tag will include the manufacturer's name, the sling assembly rate loads, the loading angle where this rate was based, the length of the sling, nominal chain size, number of chain legs and the grade of the chain. Every chain should have these and if it doesn't, the customer may be better off looking at other ones.

Lifting chains undergo many different tests to determine different safety issues. A link on the chain is sampled for tensile tests to guarantee that it would stay durable when it is put to work in the workplace. Other tests, such as breaking point and elongation tests, are also carried out. To make sure that the results are accurate, the chain is relieved of any coating or paint when undergoing these tests.

Alloys composing lifting chains are graded according to chemical structure. The grades are: 30, 43, 70, 80 and 100. There are some which receive a grade of 120. For heavy-duty lifting, Grade 80 and above are recommended. The higher the grade of the steel, the higher the rated capacity of the chain. This capacity is called working load limit or WLL. For example, a 3/8 Grade 80 chain tips the WLL scale at 7100 pounds, a Grade 100 chain, also 3/8 inch, has a WLL of 8800 pounds. The Grade 120 counterpart is 50% higher than the Grade 80 - a WLL of 10,600 pounds.

There are four types of lifting chains - alloy chains, high-tensile chains, high-test chains and proof coil chains. Alloy chains are at the top grades and are the only ones recommended for overhead lifting.

Proof coil chains are in the low grades and can be used for farming applications. The high-test chains are slightly above and are usually used for construction purposes. High-tensile chains are mistaken by some to be the same as high-test ones. They are different in thickness in favour of the high-tensile chains. These types are usually fitted with hooks at the ends and are also known as transport chains.

It is good to bear in mind that chains are just as durable as its weakest link. That emphasizes the importance of assuring that a chain meets WLL - and each component of it. Other checks are fatigue testing, minimum breaking strength and heat resistance.

Keywords: Webbing Slings, Lifting Chains, Tie Down Straps

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