High Risk Work Licence - Derrick Crane (CD) flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Primary duty of care

The PCBU must ensure, so far as is reasonably practicable, the health and safety of workers and others affected by the business or undertaking.

Class CD licence

A high risk work licence authorising the holder to operate a derrick crane; it is personal, non-transferable, and limited to the endorsed class and conditions.

Notifiable incident

An incident such as death, serious injury or illness, or a dangerous event like a crane collapse or uncontrolled load, which must be reported to the regulator.

Hierarchy of control

A ranked order of risk controls: eliminate, substitute, engineer, administrate, then PPE as the last defence, applied until residual risk is ALARP.

Exclusion zone

A barricaded no-go area beneath and around the load path, sized to the load radius and swing, keeping people clear of suspended loads and crush zones.

Shock loading

A dynamic load caused by sudden starts, stops, snatching or release, which can multiply the static load several times and exceed the rated capacity.

Guy derrick

A derrick crane whose mast is held upright by multiple tensioned guy ropes anchored to fixed points, with a boom for lifting.

Stiff-leg derrick

A derrick crane whose mast is supported by rigid structural legs rather than flexible guys, giving a fixed and more rigid support arrangement.

Load moment

The turning effect of the load about the mast base, equal to load multiplied by radius; it increases with radius and governs stability and rated capacity.

Ground bearing pressure

The imposed load divided by the effective bearing area of the footing, which must not exceed the allowable bearing capacity of the ground.

Guy anchor capacity

The maximum tension an anchorage can safely resist, including dynamic and wind effects, verified by a competent person before guys are attached.

Guy tensioning

All guys must be equally tensioned with turnbuckles or similar devices; slack or uneven guys cause mast sway and unequal loading.

Pre-start inspection

A daily check of foundation, guy tension, structure, ropes, sheaves, hooks, limit switches and the load chart before the crane is operated.

Rope discard criteria

Limits on broken wires, kinks, birdcaging, corrosion and abrasion set by the applicable standard; ropes exceeding them must be removed from service.

Logbook

A record of inspections, defects, repairs, alterations and maintenance, retained with the crane and available for audit or investigation.

Net capacity

The rated capacity minus the mass of hook block, slings and other lifting gear, giving the maximum load mass that may be lifted.

Sling angle factor

The multiplier applied to load share per leg as the angle to horizontal decreases; at 30 degrees each leg carries the full load.

Centre of gravity

The point through which the load's mass acts; it must sit below or directly under the hook to prevent tilt and unequal sling loading.

Working load limit

The maximum mass a sling, shackle or fitting is rated to carry in service, marked on the item and reduced by configuration and angle.

Rated capacity

The maximum load the crane may lift at a given radius and configuration, as stated in the manufacturer's load chart.

Load chart reading

Select the row for the actual boom length, radius and ballast configuration; never interpolate beyond listed values or assume unlisted capacities.

Radius increase effect

As the boom radius increases, the load moment rises and the rated capacity falls, so the load must be checked at every radius in the lift.

Designated signal person

The single dogger authorised to give signals to the operator, preventing conflicting commands from multiple sources during the lift.

Emergency stop signal

A recognised signal that must be obeyed immediately by the operator, regardless of who gives it, stopping all crane motion.

Radio communication protocol

A dedicated channel with clear call signs and read-back confirmation of critical commands; loss of communication requires the lift to stop.

Suspended load procedure

If a load cannot be landed, barricade the area beneath it, keep people clear, and seek competent advice before attempting recovery.

Powerline contact response

Keep clear, do not touch the crane or load, and have the supply isolated by the utility before anyone approaches the equipment.

Post-incident actions

Provide first aid, secure the scene, notify the regulator as required, preserve evidence, and complete an incident report before resuming work.

Dismantling sequence

A documented procedure in reverse of erection: unload, remove rigging, release guys in the specified order, then lower boom and mast.

Component tagging

Marking inspected items as serviceable or defective during dismantling, quarantining damaged gear so it cannot be returned to service.

Lifting gear storage

Ropes, slings and fittings kept off the ground, dry and ventilated, protected from UV, chemicals and corrosion, with small parts in labelled containers.

Shutdown checklist

A post-operational record of the crane's condition, defects found, configuration and handover details, completed before leaving site.