Rigging Principles

Question 1

What is the method in which a sling is rigged or attached to a load referred as?

Answer 1

A hitch

Question 2

D/d ratio

Answer 2

The ratio of the diameter of the load to the diameter of the sling

Question 3

A basket hitch is equal to what % of the ropes capacity if the D/d ratio is greater than 25:1?

Answer 3

200%

Question 4

Choker hitch is equal to what % of the ropes working load limit?

Answer 4

75%

Question 5

Sling eyes shall not be opened more than what % of the length of the sling eye?

Answer 5

50%

Question 6

Wire rope sling shall have a minimum clear length of _____ rope diameters between splices, sleeves, or end fittings.

Answer 6

10

Question 7

Braided slings shall have a clear length of wire rope _____ times the component rope diameter between splices, sleeves, or end fittings.

Answer 7

40

Question 8

What are the removal criteria for synthetic slings?

Answer 8

Acid or caustic burns
Surface part melting or charring
Snags
Punctures
Tears or cuts
Broken stitches
Distorted fittings
Overloading
Abrasion
Crushing
Kinking
Impact loading

Question 9

What is the stretch difference between nylon and polyester web slings?

Answer 9

Nylon stretches 8-10%
Polyester stretches 3%

Question 10

What about chemical resistance?

Answer 10

Polyester is resistant to acids
Nylon is resistant to aldehydes

Question 11

What about chemical resistance?

Answer 11

Polyester is resistant to acids
Nylon is resistant to aldehydes