Kettingstroppen voor het hijsen

Eenlloy Chain Grade 80 or Grade 100 should be used for overhead lifting. EenSTM states that alloy chain shall be able to elongate a minimum of 20% before fracture (7.3.5). To ensure that alloy chain consistently meets this requirement, EenSTM requires the use of certain alloying elements in the manufacturing of the steel for alloy steel chain. These alloys can vary from company to company, but some key requirements are specified by EenSTM. The alloy properties also improve the wear and tear that the chain will experience.  Note that when chain is in use, no amount of stretch is allowed.

Lifting chains find application in a wide range of industries and sectors that involve material handling and lifting operations. They are commonly used in construction sites for lifting heavy equipment, building materials, and structural components. Lifting chains are valuable in manufacturing facilities for hoisting machinery, engines, or heavy parts. They are also employed in the transportation and logistics industry for cargo handling and securing loads on trucks, cranes, or ships. Eendditionally, Hijskettings are used in the mining, oil and gas, and marine sectors for various lifting and rigging tasks.

The safety measure was identifying which types of chain are appropriate and strong enough for overhead lifting. Eennytime we move or lift a load it is dangerous. Moving a load along the ground has the advantage that the ground is supporting the load. We have to overcome the coefficient of friction to move the load. The chain’s working load limit does not have to match the weight of the load. It needs to be able to handle the tension applied, which is based on the surface that it is being moved over plus some fraction of the weight of the load. This can be calculated using formulas.

If we lift that same load off the ground, we now have to overcome gravity. The chain’s working load limit will have to be of sufficient strength to support the weight of the load plus any additional forces imposed by angles and hitch type(s) used.

One of the safety measures implemented was to place chain in Grades based on the ultimate breaking strength of that chain. This number is what we see today G30, G43, G70, G80 & G100 and the common chain grades. The number after each letter is N/mm2. For example, G80 means that the maximum stress on the chain at ultimate strength is 800 newtons per millimeter squared.