Chains represent an extremely adaptable class of device. As part of a vast array of haulage solutions, chains allow to flexibly lift, move and lower loads of various shapes and dimensions.

Their functionality and reliability are further expanded by coupling them with lifting beams. Used for safety, they supply an effective backup to other forms of couplings, such as towing drawbars.

Thanks to their linked nature, chains can perfectly adapt to both standard and non-standard load and component shapes and sizes, integrating well within the overall rigging setup. While mass-produced chains are widely available for ordinary, lighter loads, specialised chains may be required when dealing with unusually heavy weights or exposure to heat or chemicals.

Chains that need to satisfy such tough requirements are, in fact, often found in specialist applications, such as mining and mineral processing, metallurgy, timber, specialised lifting and marine operations, to name a few. In the latter case, they find their use in anchoring, lifting and towing operations both at sea and in port.

As they constitute an element of the load path (directly or as backup), chains can occasionally be subject to rigging failures. When failures do happen, they tend to do so ruinously and without warning. This is why Reliance Hexham chains are manufactured from a combination of material types to ensure energy at failure is absorbed, rather than catastrophically failing.

Along with other lifting devices, chains need to be thoroughly checked and tested on a regular basis, Australian Standards issue strict regulations in this regard so as to promote the safety of all personnel and equipment on site.

The relevant Australian standards specifying the requirements for chains include:

• AS 3751- Underground mining – Slope Haulage – Coupling, Drawbars and safety chains,
• AS 2321- Short-link chain for lifting purposes
• AS 3637 – Underground Mining – Winding suspension equipment – Shackles and Chains
• AS 3775 series – Chain slings for lifting purposes – Grade T (80) and V (100)
• AS 3776 – Lifting components for Grade T (80) and V (100) Chain Slings

Two aspects particularly relevant for chains are testing and inspection. Proof load testing is compulsory after manufacture, when load-bearing components have been replaced and when tags are missing.

This test verifies that the device can withstand a designated load level securely and without suffering any unacceptable deformation.

Proof load tests are followed by magnetic particle examination to exclude imperceptible fatigue cracks that may have formed during the test.

The second requirement for chains is a regular inspection. Each lifting device that is in service needs to be visually inspected prior to each use or shift by a competent person.

Lifting devices that need to be inspected include chains involved in lifting, flexible steel wire rope (FSWR), shackles, synthetic slings, hooks and catches.

Periodic inspection interval requirements range from yearly to monthly, depending on the number of lift cycles that the device goes through, where a lift cycle is defined as lifting and then lowering a load once.

During an inspection, attention should be paid to any cracks, the presence of chemical damage (such as stains or burns), gouging, or other deformations.

Worn components are measured for wear. Proper cleaning and maintenance are also essential and allow to extend the service life of lifting components considerably.

Our commitment to our customers allows us only to employ the highest quality materials; the same care goes into delivering lifting solutions bespoke to the clients’ requirements.