Module 6 Flashcards
Slings are usually made up of what three types of material ?
Synthetic materials, alloy steel chains, and wire rope
What are all slings required to have ?
Identification tags
What does the identification tag include ?
The manufacturers name or trademark, and the rated capacity for the type of hitch used with that sling
What is the maximum load Weight that a sling is designed to carry ?
Rated capacity
True or false the rated capacity must never be exceeded
True
What must you do with any sling without an identification tag ?
Remove from service immediately
What sling should you use for easily damaged loads ?
Synthetic slings
What does it mean when red core yarns are exposed in synthetic slings ?
The sling has suffered to much wear or damage
When the tattle tail becomes exposed what does this mean ?
It means the sling has been stretched beyond a safe limit
Which sling is used for high heat and rugged conditions ?
Chain slings
Chain slings for overhead lifting must be made of what ?
Alloy steel
What temperatures can alloy steel chains be used up to ?
500 F (260 C)
What slings are made of high strength steel wires formed into strands wrapped around a supporting core ?
Wire rope slings
What wire rope slings may be damaged at relatively low temperatures ?
Fiber core wire ropes
If any sling seems to have sustained damage, what must you do ?
Remove from service
What must you do if an alloy steel chain is evident of having links replaced ?
Remove from service
What is an item of rigging hardware used to attach an item to a load or to couple slings together ?
A shackle
Shackles made for overhead lifting should be made of what ?
Forged steel
What is the size of the shackle determined by ?
The diameter of the shackles body
How must the load be positioned on a shackle ?
The load must be properly balanced on the shackle
Shackles must be inspected by riggers how often ?
Before every use
Eye bolts should be made of what ?
Drop or hammer forged steel
What should you use to move loads such as steel plates, sheet piles, large pipe, or concrete panels without the use of a sling ?
Lifting clamps
How often must lifting clamps be inspected by riggers ?
Before each use
What is a rigging hook for ?
To attach a sling to a load
What hooks are used on steel chain slings ?
Grab hooks
What uses pulleys or gears to provide a mechanical advantage for lifting a load ?
Hoists
How do all chain systems lift heavy loads ?
With gear systems
True or false lube gears periodically to keep wheels from freezing
True
What do you never use for vertical overhead lifting ?
Come alongs
What are the three hitch types ?
Vertical, basket, and choker
What do you use to prevent the load from rotating while being lifted by a hitch ?
A tag line
What hitch is used when a load has no attachment points or when the attachment points are not practical for lifting ?
Choker hitch
Why should you not use a choker hitch for loose bundled materials ?
Because the choker hitch does not grip the load tightly
What do you do when the load is more than 12 feet long ?
Use two choker hitches spread far enough to provide stability
To lift loose items with a choker hitch, what do you do ?
Double wrap the choker hitch
Lifting a load longer than 12 feet requires what ?
Two double wrapped choker hitches
How is the emergency stop signal made ?
By extending both arms horizontally with palms down then quickly moving arms back and forth repeatedly extending and retracting them
Who can give the emergency stop signal to a crane operator ?
Anyone on the ground that is within sight of the crane operator
