Flashcards in Rigging, Crane and Hoist, Climbing, Lifting and Procedures Deck (70)
What do you use on a boom truck to increase the cranes stability when you hoist?
Two sets of stabilizers
The tirfor are best used for?
Moving heavy equipment across the floors or horizontally
What are the common capacities for electric hoist?
1/4 to 5 ton
What can you do on the crawler-mounted lattice boom crane to give the crane more stability?
you can extend the tracks laterally to provide a wider stance
One of the most important considerations when assessing the condition of the ground on which a crane will sit is to?
to investigate whether the ground has been excavated recently
What are the two purposes of blocking when used with outrigger floats?
*increases the bearing area of the float
*it prevents float from settling or sinking
What must you ensure when you are leveling a crane on outriggers?
that all tires are off the ground
In addition to using a target level or carpenters level, what other means can be used to determine that the crane is sitting level?
check if the hoist line is hanging plumb in two directions
What three (3) things affect the stability and reduce the lifting capacity of a mobile crane?
*quadrant that the crane is lifting over
When the crane you are using is equipped with outriggers, what must you ensure?
the outriggers beams are extended fully and that all four tires are off the ground
For transportation purposes, where is the jib extension mounted on the carrier-mounted telescopic boom crane?
crane heel (base) section of the telescopic boom
What are two basic type of cranes?
The comparison of the safety working load to the braking express as a ratio
the safety factor
When estimating the weight of a material, what percentage of the safe load is added?
What is the strength reduction on a bent rope?
50 % reduction
What is the strength reduction on a knotted rope?
50 % reduction
What is the strength reduction on a spliced rope?
What is the percentage on rope strength when a hitch is used?
Tuggers are used for?
The ratio for general rigging is?
5:1 or 5 is to 1
Safety factor for lifting and transporting workers
10:1 or 10 is to 1
Safety factor for public elevators
20:1 or 20 is to 1
When must you replace a rope?
when the surfaces are worn by 1/3 or more of their original diameter
What is the formula to calculate 5 to 1 factor on wire ropes for general rigging and hoisting?
The first consideration on lifting a load is?
the weight of the load
The rope perimeter should be supported by the sheave in an arc of?
120 to 150 degree
All turnbuckles used for rigging must be made from?
A scaffold must be design and constructed to support at least?
4 times the load
The OHS code provides the safety requirement for operating various types of hoisting equipment with a rated capacity of?
2000 kilos or more