Dogging (DG) case studies
Dogging (DG) · Put your knowledge to work in context.
Dogging is the Australian competency standard for workers who sling, secure and direct loads moved by cranes and hoists. A dogger selects and inspects lifting gear, attaches loads to the hook, works out sling tensions and load angles, controls the load with taglines, and directs the crane operator by radio or hand signals. The Dogging (DG) case studies are 5 cases and about 2,501 words.
1Uneven Four-Leg Lift on a Skewed Load
You are dogging a rectangular steel tank, 4.2 m long by 2.0 m wide, weighing 6.8 t. Its centre of gravity is offset 0.4 m toward one end because of an internal baffle.
535 words, about 3 min2Sling Tension on a Two-Leg Bridle at a Tight Angle
A precast concrete panel weighing 3.2 t is to be lifted by two chain slings in a bridle from a single hook. Each leg attaches to a cast-in anchor at the top corners.
515 words, about 3 min3Communication Breakdown During a Blind Lift
You are the dogger on a site where a 12 t steel beam is being lifted over a 6 m high wall into a trench. The crane operator cannot see the landing zone; you are on the far side of the wall and can see both the load and the landing area, but the operator can only see a second rigger on the near side.
468 words, about 2 min4Ground Bearing Under an Outrigger on Made Ground
A 25 t mobile crane is set up to lift a 4 t package at a 12 m radius. One outrigger sits on a filled area that was a service trench 18 months ago.
502 words, about 3 min5Load Control When a Tag Line Fails Mid-Slew
A 2.5 t fabricated frame, 3 m tall and 1.5 m wide, is being slewed from the laydown area to a foundation. Two tag lines are attached at the base.
481 words, about 2 min