Rigging, Crane and Hoist, Climbing, Lifting and Procedures Flashcards Preview

First Year Millwright 2018 > Rigging, Crane and Hoist, Climbing, Lifting and Procedures > Flashcards

Flashcards in Rigging, Crane and Hoist, Climbing, Lifting and Procedures Deck (70)
Loading flashcards...
1

What do you use on a boom truck to increase the cranes stability when you hoist?

Two sets of stabilizers

2

The tirfor are best used for?

Moving heavy equipment across the floors or horizontally

3

What are the common capacities for electric hoist?

1/4 to 5 ton

4

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

5

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

6

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

7

What must you ensure when you are leveling a crane on outriggers?

that all tires are off the ground

8

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

9

What three (3) things affect the stability and reduce the lifting capacity of a mobile crane?

*load distance
*load weight
*quadrant that the crane is lifting over

10

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

11

For transportation purposes, where is the jib extension mounted on the carrier-mounted telescopic boom crane?

crane heel (base) section of the telescopic boom

12

What are two basic type of cranes?

*hydraulic
*conventional

13

The comparison of the safety working load to the braking express as a ratio

the safety factor

14

When estimating the weight of a material, what percentage of the safe load is added?

12 percent

15

What is the strength reduction on a bent rope?

50 % reduction

16

What is the strength reduction on a knotted rope?

50 % reduction

17

What is the strength reduction on a spliced rope?

15% reduction

18

What is the percentage on rope strength when a hitch is used?

75%

19

Tuggers are used for?

*hoisting loads
*lowering loads
*pulling loads

20

The ratio for general rigging is?

5:1 or 5 is to 1

21

Safety factor for lifting and transporting workers

10:1 or 10 is to 1

22

Safety factor for public elevators

20:1 or 20 is to 1

23

When must you replace a rope?

when the surfaces are worn by 1/3 or more of their original diameter

24

What is the formula to calculate 5 to 1 factor on wire ropes for general rigging and hoisting?

D²x8

25

The first consideration on lifting a load is?

the weight of the load

26

The rope perimeter should be supported by the sheave in an arc of?

120 to 150 degree

27

All turnbuckles used for rigging must be made from?

Alloy steel

28

A scaffold must be design and constructed to support at least?

4 times the load

29

The OHS code provides the safety requirement for operating various types of hoisting equipment with a rated capacity of?

2000 kilos or more

30

As a rule of thumb use a minimum sheave diameter of?

20 times the rope diameter