The Department of Mines and Petroleum have released a warning to crane operators and other persons in charge of mobile cranes about the dangers of damage to head sheaves.
The DMP said operators should check mobile cranes prior to operation, including checking all head sheaves for damage.
Operators are also encouraged to operate cranes and to maintain sheave blocks according to OEM’s specifications.
The DMP reminded operators about a July 2014 incident when a nylon sheave on a mobile crane fell to the ground. The sheave weighed around 2kg and narrowly missed a rigger on the ground below. An inspection revealed that the sheave had been damaged prior to the operation.
Investigators noted that damage to the head sheave was not identified during daily pre-start inspection of the crane.