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In recent years, a significant number of fatalities and serious injuries in the metal fabrication industries have been caused by poor slinging practices when using overhead travelling cranes to move and lift large non-uniform loads.
WorkSafe inspectors have found on occasions welders, boilermakers, fabricators and trade assistants have been left to their own devices when loads need to be moved despite having no training in overhead crane use.
Some of the concerns encountered by WorkSafe inspectors are:-
The Occupational Safety and Health Regulations 1996:
The use of judgement in carrying out the dogging work is:-
Situations where a dogging licence is not required:-
A dogging licence is not required to sling and direct a load when the load remains in the clear view of the plant operator and there is no requirement to exercise judgement in relation to:
Therefore, for a simple load where no judgement is required (a predetermined centre of gravity is marked or lifting lugs are fitted), a dogging licence is not required if the person conducting the lift has:-
The practicality of safely slinging loads without the need for judgement to be exercised will vary from workplace to workplace, depending upon the range of lifting work undertaken, the predictability of the loads and the complexity of the slinging methods.
Legal requirements:-
In general, where high volume repetitive lifting occurs, such as in some manufacturing workshops, and there is no requirement to exercise judgement in relation to which sling to use, how to sling the load and the condition of the sling or the load and its centre of gravity, a High Risk Work Licence with a dogging class is not required.
Where the loads vary within a known weight range and/or a known range of centres of gravity, the specified method of slinging will need to be suitable for the full range without the need to individually identify slinging technique factors such as the condition of the lifting gear or estimate weights or centres of gravity.
For some work, the employer, main contractor or person in control of the workplace will have to consider the circumstances and make a decision about whether a dogging licence is required for the lifting of a load.
In these cases, the employer, main contractor or person in control of the workplace has the duty to ensure:
People with a dogging licence and rigging licence and professional engineers with the relevant experience and qualifications are generally regarded as competent to determine slinging methods and inspect lifting gear.
Subject to an appropriate assessment by the employer, main contractor or person in control of the workplace, a dogging licence may not be required.
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