High Risk Work Licence - Bridge and Gantry Crane (CB) flashcards

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

Primary duty of care

A PCBU must ensure the health and safety of workers and others so far as is reasonably practicable, including providing safe plant, systems of work and training.

Worker duty

A worker must take reasonable care of their own health and safety, comply with lawful instructions, and not adversely affect the safety of others.

Class CB licence

A high risk work licence authorising operation of bridge and gantry cranes; it must be current and produced on request to an inspector.

Reasonably practicable

A test weighing the likelihood and severity of harm against the cost, availability and suitability of controls, not cost alone.

Hierarchy of control

The order of controls: elimination, substitution, engineering, administrative, then PPE; higher-order controls are preferred because they are more reliable.

Exclusion zone

The area beneath and around the load and crane travel path where people are prohibited; it is marked by barriers and signage.

Hazard versus risk

A hazard is anything with potential to cause harm; a risk is the likelihood and consequence of that harm occurring.

Overhead power line hazard

Contact with energised lines can cause electrocution; controls include de-energising, isolating, or maintaining safe approach distances with a spotter.

Bridge crane

A crane whose bridge spans between runway beams and travels along them; the trolley moves across the bridge.

Gantry crane

A crane with legs running on ground-level rails or tyres; it does not rely on a building structure for support.

Rated capacity

The maximum load a crane may lift in a given configuration, stated on the load chart as a function of span and trolley position.

Parts of line

The number of rope falls supporting the load; more parts increase mechanical advantage but reduce hoist speed.

Hook safety latch

A spring-loaded device that closes the hook throat to prevent slings from slipping out; it must be functional before use.

Limit switch

A device that stops crane motion at a predetermined point, such as the upper hoist limit, to prevent damage or overload.

Pre-start check

A visual and functional inspection of wire rope, hook, brakes, limits, controls and structure before each shift; defects are recorded.

Logbook

A legal record of pre-start checks, defects, maintenance and handover; entries must be made legibly and in a timely way.

Tag out isolation

A lock and tag applied to the energy source to prevent operation during maintenance; only the person who applied it may remove it.

Wire rope discard criteria

Rope is removed from service when broken wires, corrosion, kinks or diameter reduction exceed the manufacturer's or standard's limits.

Load mass estimation

Determining load mass from known data, density times volume, or weighing; uncertainty requires verification before lifting.

Sling angle effect

As the angle between sling legs and horizontal decreases, tension in each leg increases; included angles above 120 degrees are avoided.

Centre of gravity

The point where the load's mass is balanced; the hook must be positioned above it to keep the load level.

Dogger or signal person

A designated competent person who directs the crane operator using standard signals or radio and controls the load.

Load control during travel

Keeping the load low, moving smoothly, and avoiding people; sudden movements cause swing and dynamic loads.

Dynamic load

Additional force caused by acceleration, deceleration or swing; it can exceed the static rated capacity and must be controlled.

Limit switch misuse

Using the upper limit switch as an operating stop is prohibited; the operator must stop the hoist before the limit is reached.

Wind speed limit

The maximum wind speed at which the crane may operate, set by the manufacturer or site; operations stop when it is exceeded.

Emergency stop use

An emergency stop is used for imminent danger; the cause must be investigated before the crane is returned to service.

Suspended load emergency

If a load cannot be lowered, cordon the area, secure the load, and prevent access to the drop zone until it is resolved.

Notifiable incident

Death, serious injury or illness, or a dangerous incident; the regulator must be notified immediately and the site preserved.

Standard hand signals

Agreed signals used when radio fails; the signal person must be clearly visible to the operator, and only one person directs.

Radio communication protocol

Use a dedicated channel, clear concise phrases, and repeat critical instructions; if communication is lost, stop the crane.

Handover requirements

The outgoing operator briefs the incoming operator on crane condition, defects, work in progress and any restrictions on use.