High Risk Work Licence - Slewing Mobile Crane C2 (20t) flashcards

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

C2 licence capacity

A C2 high risk work licence authorises operation of a slewing mobile crane with a maximum rated capacity of up to and including 20 tonnes, regardless of the load actually lifted.

Licence renewal period

High risk work licences are issued for five years and must be renewed before the expiry date; operating on an expired licence is unlicensed work.

SWMS requirement

A Safe Work Method Statement is mandatory for high risk construction work, and must be prepared, followed and reviewed for crane operations on construction sites.

Primary duty of care

A PCBU must eliminate risks so far as is reasonably practicable, and if elimination is not possible, minimise risks using the hierarchy of controls.

AS 2550.5 scope

AS 2550.5 sets Australian requirements for the safe use of mobile cranes, covering inspection, maintenance, operation, lifting and personnel responsibilities.

Competent person meaning

A competent person has the training, qualification or experience needed to perform the assigned task safely, such as crane inspection or maintenance.

Hierarchy of controls order

Controls rank from elimination, substitution, engineering controls, administrative controls, down to personal protective equipment as the last line of defence.

Load radius definition

Load radius is the horizontal distance from the crane's slewing centre to the centre of gravity of the load, measured with the boom in its working position.

Rated capacity factors

Rated capacity depends on load radius, boom length, boom angle, counterweight, outrigger configuration and jib setup, and is read from the manufacturer's load chart.

Gross versus net load

Gross load includes the load plus rigging, slings, hook block and attachments; net capacity is the chart capacity minus these deductions.

Load moment indicator

The LMI monitors load and radius, displays capacity utilisation, and alarms or cuts out when the crane approaches or exceeds its rated capacity.

Wire rope discard criteria

Broken wires in a set length, diameter reduction, corrosion, kinks and bird-caging determine wire rope retirement under AS 2759 and ISO 4309.

Daily pre-start inspection

A documented daily check of tyres, outriggers, wire rope, hook and latch, brakes, slew ring and safety devices before the crane is used.

Two-leg sling tension

Tension per leg equals half the load divided by the cosine of the angle from vertical; wider included angles increase tension in each leg.

Sling angle factor

The tension multiplier is about 1.155 at 60 degrees from horizontal, 1.414 at 45 degrees, and 2.0 at 30 degrees.

Four-leg sling rating

Most standards rate a four-leg sling assembly for only three legs carrying load, because equal sharing among four legs is not assured.

Sling rejection signs

Cuts, fraying, broken wires, heat or chemical damage, distorted fittings, and missing or illegible tags require the sling to be removed from service.

Outrigger bearing pressure

Ground bearing pressure under an outrigger equals the load share divided by the pad contact area; larger pads reduce pressure on the ground.

Underground service check

Before setting outriggers, locate underground power, gas, water and communications services using service records and a locator to avoid damage.

Level setup requirement

The crane must be set up on a level, stable surface within the manufacturer's maximum slope, verified with a level before any lift.

Exclusion zone purpose

A barricaded exclusion zone keeps unauthorised people out of the slew radius and the area under the load, preventing crush and drop injuries.

Smooth slew technique

Slew slowly and smoothly because sudden starts and stops cause load swing and increase dynamic loading on the crane and rigging.

Tag line use

Tag lines control load rotation during the lift; handlers must stay clear of the load and never stand beneath it.

Travel with load rules

Travel with a load only when the manufacturer permits it, the load is within travel capacity, and the boom is in the specified travel position.

Stop signal authority

A stop signal must be obeyed immediately regardless of who gives it, even if another person is the designated signal person.

Designated signal person

One signal person is designated for each lift; commands are clear and confirmed, and the operator responds only to that person except for stop signals.

Lost radio contact

If radio contact is lost, the operator stops the lift and holds the load until communication is restored or the load is safely landed.

Powerline contact response

Stay in the cab, warn others to stay clear, and do not touch the crane or load until the power authority isolates the supply.

Cab evacuation technique

If fire forces evacuation, jump clear of the crane and shuffle away with feet together, never touching the crane and ground at the same time.

Notifiable incident duty

Serious injuries and dangerous incidents must be reported to the regulator, and the site preserved so far as reasonably practicable until an inspector permits otherwise.

Post-shift crane securing

After the shift, land and secure the load, retract and lower the boom, stow outriggers, apply the parking brake, chock wheels and isolate power.

Defect reporting after shift

Post-operational inspections record any defects, which are reported so the crane is not returned to service until repaired by a competent person.