Rigging And Hoisting Flashcards
Of a block and tackle with 5 rope falls and minimum friction, how much force is needed to retain 250lbs?
50 lbs (250 Γ· 5)
What diameter rope is needed to support 2 tons using a vertical lift?
1/2β
What is the standard safety factor to consider for platform supporting people?
10:1
If a wire rope has a breaking strength of 15000 lbs, determine the safe working load under normal lifting conditions.
3000 lbs
Hi π
Good job, Keep it up !
What type of lifting technique has the least lifting capacity ( if all use the same rope) ?
Choker sling
What type of sling presentation will accept 200% of the SWL? ( Safe working limit)
Basket
The signal for stop in rigging is what?
Flat of hand waved across chest
The construction of a wire rope is determined by the direction of the twist of strands. This is known as what?
Lay
What type (number) of flexible wire rope for overhead Crane use?
6-37
A type of knot used to tie 2 lines of the same size together so they will not slip is called?
Reef
What sling setup can achieve good gripping action?
Choker
When using a swivel eyebolt for rigging, what must you do?
Make sure it is torqued correctly
A signal person has their arm at 90Β°, and thumbs pointing inwards. What is this signal?
Retract boom
You are using an electromagnet magnet drill to drill a hole in an I-beam. What is the 1st safety precaution to take?
Rig the drill to the beam
What stops the Crane block at the top?
Upper limit switch
What are double clip hooks used for?
Use for human safety harnesses
What is the distance between slings if you are using a 2 part bridle with 2 slings at 60οΎ, and each sling is 46β long?
46β
What type of rope is not to be used in high heat environments?
Manila
What is the calculation for the SWL (safe working load) of a 4 part bridal?
SWL X H/L X 3
What do you use to lift an acetylene container?
Suitable cradle
What is the lift capacity of a 6000 lbs breaking strength rope when used on a platform supporting people?
600 lbs (6000Γ·10)
What prevents the lower and upper chain blocks from touching?
Limit switch
What is a turnbuckle used for?
Leveling the load( adjusting tension)
If you are 60β away from a Crane, looking up at a 45οΎ angle to the boom, what is the boom height if it is in the vertical position?
60β
How is the mechanical advantage gained in a rope fall?(pulleys)
By the # of rope falls
What is a tag line used for?
To prevent the swinging of the load
What term is given to the opening of a hook?
Throat
What is a continuous piece of rope called?
Endless sling
High stranding of one layer of wire rope is called what?
Bird caging
What type of rope is used for heavy lifting?
6-7
What happens to a rope when it is unwound incorrectly?
Kinking
How are cable clips installed?
Saddles are on the live side only
What is the safe working limit of a 3/8β diameter rope in a 2 part bridal configuration at 60οΎ lifting angle?
4000 lbs
The signal of the finger rotated in the palm of the hand means what?
Everything slow
When are wire ropes replaced?
When 3 or more broken wires are found a one strand of 1 lay
Using the average weight of 500 lbs per cubic foot for steel, calculate the approximate weight of a plate you want to lift that is 6β long, 5β 8β wide, and 1 1/4 β thick.
1700 lbs
A hand signal where thumb is pointing upwards and fingers on same hand are flexing means what?
Boom up load down
What is the type of rope for good flexibility?
6-37
What is the correct way to store a sling?
Hanging vertically
What is used on a shackle pin when lifting a rotating load?
Safety pin
What is used with a Crane to move a load horizontally?
Snatch block
What type of lift is used for a bundle of pipes?
Double wrap choker
