What is the risk associated with two blocking?

The risk associated with two-blocking primarily involves the potential for the crane to drop its load. Two-blocking occurs when the hook block comes into contact with the top block of the crane, which can create extreme tension in the hoisting system. This event can lead to a failure of the lifting mechanism, potentially resulting in the load being dropped from height.

In cases where this occurs, the sudden release of tension may cause the load to fall uncontrollably, posing significant dangers to personnel and structures below. This situation highlights the importance of proper operational procedures and monitoring of crane movements to prevent two-blocking incidents. Understanding the mechanics of the crane and the relationship between load limits and signal operations is crucial for safely utilizing crane equipment.