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Rigging > Chapter 2 > Flashcards

Chapter 2 Flashcards

Rope Types

1
Q

What are the common uses of rope in the electrical industry?

A

Pulling conductors, rigging applications, securing loads, or simply raising and lowering tools and material to workers on structures.

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2
Q

What is one of the most versatile and commonly utilized tools in the construction industry?

A

Rope

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3
Q

What is the OSHA Standard for rope use?

A

1926.251

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4
Q

What are the three most common rope types?

A
  • Natural Fiber Ropes
  • Synthetic Fiber Rope
  • Wire Ropes
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5
Q

What is the ONLY Natural Fiber Rope that is able to be used for rigging purposes?

A

1 Grade Manilla

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6
Q

Why does Manilla Rope have limitations?

A

Its is subject to rot.

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7
Q

What happens when Manilla Rope gets wet?

A
  • Shrinkage

- Loss of Strength

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8
Q

Prolonged sunlight exposure will also cause Manilla Rope to _________?

A

Deteriorate

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9
Q

OSHA requires Natural Fiber Ropes to be immediately removed from service if any of the following conditions exist:

A
  • Abnormal Wear
  • Powdered Fiber Between Strands
  • Broken or Cut Fibers
  • Variation in the size or roundness of strands
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10
Q

How are Synthetic Fiber Ropes made?

A
  • They have individual fibers running their entire length.
  • Fibers are wound on direction to make strands
  • Strands are wound the opposite direction
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11
Q

What are some good properties Synthetic Fiber Ropes have?

A
  • Has a high weight to strength ratio
  • Absorbs very little moisture
  • Does not stiffen when wet
  • Has good dielectric properties when clean and dry
  • Is resistant to damage caused by water and mildew
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12
Q

How much stronger is Synthetic Fiber Rope over Manilla Rope?

A

It can be 2-1/2 times stronger.

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13
Q

What are some other good properties of Synthetic Fiber Ropes?

A

They are lighter, easier to handle, and have excellent impact, fatigue and abrasion resistance.

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14
Q

What are Synthetic Ropes made of?

A

Nylon, polyester, polypropylene, and/or polyethylene either stranded or braided.

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15
Q

What are the properties of a stranded rope?

A

Made of larger cords of rope and has a bumpy surface

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16
Q

Why are braided ropes so much smoother than stranded ropes?

A

They are constructed with many smaller cords of rope and take on a woven look.

17
Q

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

A
  • 1/2” Line
  • 6.7 lbs per 100’
  • Catalog Breaking Strength of 5,800 lbs
18
Q

What are the advantages of braided synthetic ropes?

A
  • Lower Weight
  • Higher Strength
  • Increased Durability
19
Q

What are some properties of Duraplex?

A
  • Each strand consists of a combination of polyester and olefin fibers giving it excellent weight to strength ratio.
  • 1/2” line has a Catalog Breaking Strength (CBS) of 6,700 lbs.
20
Q

What are some properties of Tenex?

A
  • Made of Samthane coated polyester with excellent abrasion resistance and durability in addition to its high strength.
  • 1/2” line has a Catalog Breaking Strength (CBS) of 11,800 lbs.
21
Q

What are some limitations that Synthetic Fiber Ropes have?

A
  • Strands will melt subject to heat.

- Can be damaged by sharp edges or abrasion when under tension.

22
Q

What are OSHA’s requirements for removal of Synthetic Fiber Rope?

A
  • Abnormal Wear
  • Powdered Fiber Between Strands
  • Broken or Cut Fibers
  • Variation in the Size or Roundness of Strands
23
Q

What are the primary uses of using wire rope in the power delivery industry?

A
  • Heavy Duty Rigging Slings
  • Hoist Lines for Cranes
  • Hoisting Large Heavy Loads
24
Q

What are the three basic grades of wire rope made of steel?

A
  • Mild Plow Steel Wire Rope
  • Plow Steel Wire Rope
  • Improved Plow Steel Wire Rope
25
Q

When should wire ropes be avoided?

A

Any work involving energized conductors and apparatus.

26
Q

What is wire rope subject to?

A
  • Rust erosion in the center of the wire rope

- Kinks or Bends

27
Q

What is some good maintenance of rope?

A
  • Ropes should be clean and dry when stored.
  • Ropes should be hung in neat coils devoid of kinks or twists
  • Splinter, thorns, burrs, sand, and gravel should be removed at every opportunity
  • Avoid contact with chemicals that may weaken the strength of the rope
28
Q

What is CBS?

A
  • Catalog Breaking Strength

- The average force in pounds needed to break a rope

29
Q

What is WLL?

A
  • Working Load Limit

- The maximum load that should ever be applied to a rope

30
Q

What is WLL sometimes referred to as?

A
  • Safe Working Load (SWL)
  • Maximum Load Value
  • Rated Capacity
31
Q

What fraction or percentage is the WLL of the CBS?

A

One-Fifth (1/5) or 20%

32
Q

What is the number used to calculate the WLL of a rope?

A
  • Design Factor

- Industry Standard is 5

33
Q

What are the equations for calculating WLL?

A
  • WLL = CBS / 5
  • WLL = CBS divided by 5
  • WLL = CBS x .2
34
Q

What is the weakest point of a rope?

A

Knots and Splices

35
Q

What is Dynamic Loading?

A

Dynamic Loading occurs when ropes are subject to severe exposure conditions.

36
Q

What are some examples of Dynamic Loading?

A
  • Shock Loading
  • Excessive Use
  • Exposure to High Temperatures
  • Extended Periods Under Load

Rigging (8 decks)

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