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Rigging > Chapter 8 > Flashcards

Chapter 8 Flashcards

Parted Blocks

1
Q

When are Parted Blocks commonly used?

A
  • Sag Conductors
  • Set Poles
  • Hang Pole Line Equipment
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2
Q

When is Pole Setting and Equipment Installation usually done with blocks?

A

When the location is inaccessible to derricks and material handlers.

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3
Q

What are the components that make up Parted Blocks?

A
  • Hook
  • Safety Latch
  • Swivel
  • Sheaves
  • Shell
  • Center Pin
  • Becket
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4
Q

When inspecting the Hook & Safety Latch what are you looking for?

A
  • Bent Hook
  • Defective Safety Latch
  • Excessive Wear at ALL Contact Points
  • Metal Fatigue
  • Rust
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5
Q

When inspecting the Swivel what are you looking for?

A
  • Metal Fatigue
  • Rust
  • Excessive Wear
  • Operates freely
  • Lubricate if Needed
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6
Q

When inspecting the Shell what are you looking for?

A
  • Cracks
  • Breaks
  • Sharp Edges
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7
Q

When inspecting the Center Pin what are you looking for?

A

Tightly Seated & Secured

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8
Q

When inspecting the Becket what are you looking for?

A
  • Secure

- Check for wear on the rope at the point of contact

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9
Q

When inspecting the Sheaves what are you looking for?

A
  • Turns Freely
  • Excessive wear on the bearings by moving the sheave up & down
  • Cracks & sharp edges that can cut the rope
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10
Q

Where will blocks typically have their weight rating?

A

Stamped on the hook or shell

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11
Q

If a block doesn’t have its weight rating tag visible what should you do?

A

Remove it from service immediately.

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12
Q

What should you do before using parted blocks?

A

Ensure that the proper blocks are used for the rigging application.

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13
Q

Where should you store Parted Blocks?

A

In a dry place.

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14
Q

What should you do if Parted Blocks become soiled?

A

Rinse thoroughly and lubricate the sheave bearings per the manufacturer’s recommendations.

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15
Q

What is the point of Parted Blocks?

A

To provide a Mechanical Advantage.

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16
Q

How is the advantage of Parted Blocks provided?

A

Because there are multiple parts of rope supporting the load.

17
Q

How is the load divided when using parted blocks?

A

Between the number of parts supporting it

18
Q

What are the two tensions involved with Parted Blocks that care critical for lineworkers to understand?

A
  1. ) Haul Line

2. ) Hook Strain

19
Q

Why is Haul Line calculated?

A
  • To verify that the WLL of the rope is not exceeded.

- To determine that the WLL of the hoisting mechanism is not exceeded

20
Q

Why is Hook Strain calculated?

A

To verify that the WLL of the blocks is not exceeded.

21
Q

What happens when a rope travels through a sheave?

A

Friction is created.

22
Q

What does the friction create on the rope?

A

TENSION

23
Q

What is a good rule of thumb when calculating the friction on a rope running through a sheave?

A

10%

24
Q

Is there Mechanical Advantage when only one block is used?

A

NO

25
Q

When is one block ONLY used?

A

When the direction of pull must be changed or an object must be raised.

26
Q

What does the number of parts supporting the load determine?

A

The amount of Mechanical Advantage gained.

27
Q

When does the friction overcome the Mechanical Advantage?

A

When 10 or more parts of rope are used

28
Q

What is the equation of the Haul Line?

A

1.1p x W / P

29
Q

When does the greatest Mechanical Advantage occur?

A

At TWO Parts

30
Q

After how many parts does the Haul Tensions Line begin to decrease?

A

After 10 parts

31
Q

When is the Haul Tension Line greater than the load?

A

When only ONE part is used.

32
Q

What should you notice when increasing the number of parts increases?

A

The tension on the haul line decreases.

33
Q

What are the two forces that apply tension to the hook?

A
  • The weight of the load

- Force applied to the haul line

34
Q

What is the Hook Strain equivalent to?

A

Haul Line Tension PLUS the weight of the load.

35
Q

Why is Hook Strain calculated?

A

To ensure that the WLL o the block is not exceeded.

36
Q

Which is greater the Standing Block Hook Strain or the Running Block Hook Strain?

A

Standing Block Hook Strain

37
Q

What is the equation to calculate Hook Strain?

A

Haul Line + W

(1.1p x W / P) + W

38
Q

What happens to Hook Strain when # of Parts is Increased?

A

It decreases.

39
Q

Why is it important to calculate hook strain before any rigging application?

A

To ensure the proper selection of equipment.

Rigging (8 decks)

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