RIG CH.2

Question 1

What does OSHA standard 1926.251 apply too?

Answer 1

The use and care of ropes

Question 2

What are the three most common types of rope?

Answer 2

Natural fiber, synthetic fiber ropes and wire ropes

Question 3

What is the main natural fiber rope used for rigging?

Answer 3

1 Grade Manila

Question 4

What is the main limitation of Manila rope?

Answer 4

it is subject to rot

Question 5

What are some other limitations of manila rope besides rot?

Answer 5

Shrinks and loses strength when wet

Question 6

If you had the option between manila rope or synthetic rope which would you use?

Answer 6

Synthetic

Question 7

What conditions present on natural fiber rope would remove the rope from service immediately?

Answer 7

Abnormal wear, Powdered fiber between strands, broken or cut fibers, and variation in the size or roundness of strands

Question 8

What characteristic does the fibers on synthetic rope have?

Answer 8

Fibers run the entire length of the rope

Question 9

How are fibers wound?

Answer 9

Fibers are wound in one direction and strands are wound in the opposite direction.

Question 10

What are some key characteristics of synthetic rope?

Answer 10

High weight to strength ratio, absorbs very little moisture, does not stiffen when wet, has good dielectric properties when clean and dry, resistant to damage caused by water and mildew

Question 11

How much stronger can synthetic rope be than manila rope, of the same diameter?

Answer 11

2.5 times stronger

Question 12

What are some common materials that synthetic ropes are made from?

Answer 12

nylon, polyester, polypropylene, and/or polyethylene

Question 13

What characteristics are typical of a three-stranded synthetic rope used in the utility industry?

Answer 13

1/2 inch line, 6.7 pounds per 100 feet, and a catalog breaking strength of 5800 pounds

Question 14

What are the OSHA requirements for removal of synthetic rope?

Answer 14

Same as natural fiber rope, abnormal wear, powdered fiber between strands, broken or cut fibers, variation in the size or roundness of strands

Question 15

What is the strongest of the wire ropes?

Answer 15

Improved plow steel wire rope

Question 16

What are the primary uses for wire rope?

Answer 16

heavy duty rigging slings and hoist lines for cranes

Question 17

What are the three basic grades for wire rope?

Answer 17

mild plow, plow, and improved plow steel wire rope

Question 18

When should the use of wire rope be avoided?

Answer 18

When working around energized conductors and apparatus

Question 19

Many companies will have you discard wire rope if this condition is present.

Answer 19

Any of the wires are broken

Question 20

Regardless of what type of rope, what condition should all ropes be kept as?

Answer 20

All rope should be kept as clean as possible

Question 21

What is the minimum proper care that all ropes should have?

Answer 21

Ropes should be clean and dry when stored, ropes should be hung in neat coils devoid of kinks or twists, avoid contact with chemicals that may weaken the strength of the rope, remove the following at every opportunity: splinters, thorns, burrs, sand, and gravel

Question 22

Define Catalog Breaking Strength (CBS)

Answer 22

The average force needed to break a rope

Question 23

T or F: Ropes should be subjected to tensions approaching the CBS

Answer 23

False

Question 24

Define Working Load Limit (WLL)

Answer 24

The maximum load that should ever be applied to a rope

Question 25

What are some other names for the working load limit?

Answer 25

Safe working load, maximum load value, and rated capacity.

Question 26

T or F: The working load limit is always less than the catalog breaking strength.

Answer 26

True

Question 27

What is the industry standard on how much less should the WLL be than the CBS?

Answer 27

one-fifth or 20% of the CBS

Question 28

T or F: When using ropes it is okay to regularly exceed the WLL as long as it is under the CBS.

Answer 28

False

Question 29

What is the Design Factor?

Answer 29

Design Factor is an arbitrary number used for calculating WLL. CBS is divided by Design Factor to determine WLL.

Question 30

What is the weakest point of a rope?

Answer 30

At the knot or splice

Question 31

What is the calculation for WLL?

Answer 31

WLL = CBS / Design Factor

Question 32

What is dynamic loading?

Answer 32

Dynamic loading is when ropes are subject to severe exposure conditions

Question 33

What are some examples of dynamic loading?

Answer 33

shock loading, excessive use, exposure to high temps, and extended periods under load