High Risk Work Licence - Derrick Crane (CD) case studies
High Risk Work Licence - Derrick Crane (CD) · Put your knowledge to work in context.
The Derrick Crane (CD) high risk work licence is an Australian competency-based credential for people who operate derrick cranes - a crane type built around a mast, boom and guy system rather than a self-propelled chassis. It suits riggers, doggers and crane operators moving into heavy lifting on construction, industrial, marine and resources sites, and anyone whose job includes setting up, operating or dismantling a derrick. The High Risk Work Licence - Derrick Crane (CD) case studies are 5 cases and about 2,473 words.
1Guy anchor pull-out on a stiff-leg derrick after overnight rain
A 12 t stiff-leg derrick has been working for three days on a compacted gravel pad at a quarry. Its two backstays are anchored to buried concrete deadmen rated at 90 kN each, installed by the site contractor.
529 words, about 3 min2Two-crane tilt-up of a derrick mast near an exclusion zone
A 10 t pedestal derrick mast is being erected in a plant yard. The mast is 24 m long and is being raised from horizontal by two mobile cranes: Crane A at the base end and Crane B at the top end.
515 words, about 3 min3Load chart interpretation with a lattice boom derrick and a long radius
A lattice-boom derrick is lifting prefabricated wall panels onto a building frame. The panel weighs 2.4 t, and the rigging (spreader beam, slings, and shackles) adds 0.35 t.
483 words, about 2 min4Out-of-level derrick base on a temporary pad
A small derrick is set up on a temporary steel pad beside a bridge abutment. The pad was levelled with packed timber, and the base is supported on four outrigger-style feet.
447 words, about 2 min5Dismantling a derrick after a long campaign in a corrosive environment
A derrick has been installed for 14 months at a coastal fertiliser plant. The atmosphere is humid and salty, and the plant handles ammonia.
499 words, about 2 min