How much DWP remains on your crane?
A central requirement is to verify by a risk assessment that a crane is safe to use. In the case of a second-hand crane, it is necessary to know how much, if any, of the intended Design Working Period (DWP) remains before you can say it is safe to use and of any worth to your business. DWP is not measured in calendar years but calculated from the number and duration of work cycles using the average load lifted. The risk assessment requires you know the crane classification and the previous owner’s crane usage details.
The article Cranes: Age Awareness published by the independent Lifting Equipment Engineers Association (LEEA) explains the recurrent failures because those responsible have not properly verified the remaining design life putting it this way:
“To concentrate directors’ minds, it is worth noting that recent crane-related fatalities have resulted in multi-million-pound fines, corporate failure, disbarment from being a director and in some cases jail sentences. Age-related failures are entirely avoidable provided everyone in the chain of responsibility performs their role”