RIG CH.9 Flashcards

1
Q

When are snatch blocks used?

A

To redirect lines

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2
Q

Where can you find the weight rating of snatch blocks?

A

Stamped on the hook or shell

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3
Q

Explain the tension angle relationship.

A

When angle decreases, tension increases

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4
Q

What is the line in tension?

A

The tension found on the line from the weight to the snatch block. It is equal to the weight.

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5
Q

What is the line out tension?

A

The tension found on the line from the snatch block to the ground. It is equal to the weight times 10% friction

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6
Q

What is the equation for snatch block tension?

A

Snatch block tension = line out * angle factor

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7
Q

The rope angle is 180, what is the angle factor?

A

0

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8
Q

The rope angle is 120, what is the angle factor?

A

1

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9
Q

The rope angle is 90, what is the angle factor?

A

1.41

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10
Q

The rope angle is 60, what is the angle factor?

A

1.73

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11
Q

The rope angle is 45, what is the angle factor?

A

1.84

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12
Q

The rope angle is 0, what is the angle factor?

A

2

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13
Q

What are the steps to calculate multiple snatch blocks?

A
  1. calculate friction throughout line 2. Remember line out for the first block will be the line in for the second block
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