Industrial Rigging Flashcards
The horizontal force on slings increases as the angle becomes ________ than 90*.
Smaller (30, 45)
Which hitch is looped around the load, which must then be balanced to keep from tipping.
The basket hitch.
The ________ hook has a point designed to fit into holes.
The sorting hook.
What are some reasons for removing a hook from service?
Hook throat has increased by 10%
Wear exceeds 10%, or there is a bend or twist prom the plane of the unbent hook.
Hooks shiws obvious signs of wear (crack, gouges)
Throat and hook not parallel.
The main purpose of a sling is to??
Suspend a load from a hoist.
Before lifting a load, you should ensure its center of gravity should be?
Directly below the hoist hook.
To avoid damaging a load from the horizontal forces being to great you should use a _________ beam.
A spreader beam.
Wire rope classification specifies the number of strands the rope contains and the number of wires in each strand.
True
What happens to wire rope that has been bent over curved surfaces?
It is subject to bending stresses, which reduces the efficiency of the rope and also the strength.
The efficiency if the rope depnds on what ratio?
The D/d ratio. Diamenter of the curved surface and the diameter of the wire rope.
When properly installe,spelted and swaged sockets provide how much efficiency?
100%
What are some conditions for removing a wire rope from service?
Rope distortion (kinking, crushing,unstranding)
Heat damage
Corrosion
Broken wires
What grade of chain is the only one recomended for overhead lifting?
Grade 80 alloy steel chain.
High strength, premium quality chain, also identified by an 8,80,800.
What are some terms used to reference chains, their strength, and their capabilities?
Working load limit, proof test, and minimum breaking force.
Alloy steel chains that have been exposed to temperatures above ______*f should be removed from service immediatly.
1000* f
