Rigging (110101e) Flashcards
What is the recommended angle for slings?
60 degrees
What are chain hoist also know as?
Chain falls
What are tow categories of fiber ropes?
Twisted(or laid) and braided
What are the two most common fiber ropes used?
Nylon and polypropylene
How much stronger are nylon ropes compared to natural fiber ropes?
2.5 times out of
What is the most popular type of rope available?
Polypropylene
What is the safety factor of a brand new rope and of an old one?
5:1 for the new
10:1 for the old
What does a knot in rope do to the strength?
Reduces it by 50%
What does a splice in a rope do ?
Reduces it 20%
Name some knot types
Bowline knot
Sheep shank
Figure 8 knot
Sheet bend
How are wire rope slings made?
They are made from one piece that is looped and twisted together with a thimble on the end
What does shock loading mean?
this is when the load is dropped and caught by the rigging or when there is an uncalled-for strain on the load.
How is mechanical advantage calculated with block and tackle?
by counting the ropes between is the mechanical advantage
What increases mobile cranes’ stability?
Outriggers
when is a crane at its full potential for lifting?
When its near and vertical
what is a major advantage of helicopter lifts?
The speed at witch a job can be done
downside is the cost
when does OH&S require you to check rigging?
Before every shift
when must wire ropes be replaced?
When they are kinked or they have 1/3 of the original diameter worn away
what are the two main types of cranes?
Tower cranes
Mobile cranes
What is the hand signal for stop?
one arm is waved back and forth perpendicular to the body
What is the hand signal for emergency stop?
both arms waved straight out
what is the hand signal for Dog everything?
lock hands by the thumbs and in front of your lap
what is the hand signal for hoist load up?
up and circular motion pointing
what is the hand signal for lowering the load?
point down and circular motion
