High Risk Work Licence - Portal Boom Crane (CP) case studies
High Risk Work Licence - Portal Boom Crane (CP) · Put your knowledge to work in context.
The Portal Boom Crane (CP) high risk work licence is the Australian credential that authorises you to operate a portal boom crane - a slewing boom crane mounted on a portal or gantry base that straddles its own rail or roadway, commonly seen in yards, depots and precast or bulk handling facilities. Candidates are usually experienced doggers, riggers or crane operators adding a crane class, or workers moving into yard and plant operations where a portal crane is the primary lifting machine. The High Risk Work Licence - Portal Boom Crane (CP) case studies are 5 cases and about 2,613 words.
1Rated capacity at the lift radius
You are operating a portal boom crane on a wharf, lifting a 7.2 t prefabricated steel module from a truck parked 14 m from the slew centre. The crane's load chart for the current boom length and configuration shows 8.0 t at 14 m, 6.6 t at 16 m, and 5.4 t at 18 m, all with the outriggers fully extended on the specified pad size.
600 words, about 3 min2Pre-start inspection findings
During a pre-start walkaround on a portal boom crane, you find: a slow hydraulic weep at a boom-luff cylinder gland (about one drop per minute when the boom is held up); a wire rope with three broken outer wires in one lay over a 6-diameter length, plus general surface rust but no pitting; a load moment limiter that powers up and displays a reading but whose test button produces no audible alarm; and a slight oil film on one outrigger beam. The crane was used on the previous shift and the logbook shows no defects recorded.
528 words, about 3 min3Blind lift over a live traffic lane
You must lift 2.4 t of formwork panels from a laydown area on the landward side of the wharf to a barge on the seaward side. The crane is positioned so the operator cannot see the barge deck; the slew path crosses a wharf road used by trucks, and there is a 6 m gap between the crane and a row of stacked containers that blocks the line of sight.
511 words, about 3 min4Load estimation and sling angle
You are asked to lift a steel tank of unknown weight. The tank is 2.2 m diameter, 3.0 m long, with 8 mm shell and ends, and has a nameplate that is painted over.
515 words, about 3 min5Emergency during a power failure
You are slewing a 5 t bundle at 10 m radius when the crane loses power. The load is over a walkway, about 4 m above the deck, and the boom is at 60 degrees.
459 words, about 2 min