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The following article was published in our article directory on August 10, 2011.
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Which Lifting Chains Should I Used?

Article Category: Advice

Author Name: Emma Louise

In manufacturing and construction, there are procedures that require overhead lifting of heavy objects. Tools often used in the procedure of heavy lifting, are lifting chains. These chains are designed to be used with cranes, hoists, winches and the like.

Lifting heavy objects has dangers. One failure in any component can lead to accidents that could cause damage to equipment and, more terrifying, injuries or death to people. With this, safety is on the top priority when it comes to selecting and preparing lifting equipment such as lifting chains.

Selecting a good quality lifting chain is relatively easy. That's because there are distinguished classifications of them. There are four, namely, proof coil chains, high-tensile chains also known as transport chains, high-test chains and alloy chains. These categories are based on the chemical composition, use, and strength.

Proof coil chains are considered in the low grade of lifting chains. These types of chains are good enough for towing, some marine applications, logging and farming. It can be used for minor industrial lifting but is not recommended for overhead lifting.

High-test chains are a slightly higher quality and above the proof coil chains in grade. They are ideal for use in construction applications but are also not recommended for overhead lifting.

High-tensile chains, which are commonly mistaken with high-test chains, are higher in grade, thicker and are usually fitted with hooks at the ends. They are also called transport chains. Although these kind of chains are stronger than proof coil and high-test ones, they are still not recommended for the overhead lifting of heavy objects.

The alloy chains are the strongest chains and are ideal for lifting heavy loads. These chains are the only ones recommended for overhead lifting because of its strength.

Aside from the categorization mentioned, lifting chains and chain slings are also given grades. These grades are according to their composition. The samples of grades are: 30, 43, 70, 80 and 100. Lifting capacity is directly proportional to the grade.

When selecting a chain, it is also a good practice to consult manufacturers or other expert personnel. One important thing to remember is that the chain's strength is determined by its weakest link. With that in mind, it should be checked whether each component is in its optimal quality. Information to look into includes fatigue testing, minimum breaking strength and heat resistance. There are organizations, like the American Society of Mechanical Engineers (ASME) and the National Association of Chain Manufacturers, which create standards for lifting chains so that customers will have a clear basis.

Working load limit is an example of a determinant of a chain's capacity. It is based in the chain's components and its grade. As an example, a working load limit of 7100 pounds is given to a 3/8 inch Grade 80 chain. Then, a Grade 100 chain with the same thickness has a working load limit of 8800 pounds. For a greater comparison, the Grade 120 chain, 3/8 inch again, has a working load limit of 10,600 pounds - the Grade 80 is 50% lower.

All this information can be seen on the identification tag and certificate of the lifting chain. It is a good measure to read it. If there is none, the chain is not trustworthy anyway.

Keywords: Webbing Slings, Lifting Chains, Tie Down Straps

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