Pipefitter Rigging and Hoisting Operations 4

Question 1

What is the minimum safety factor (design factor) required for wire rope slings used in rigging operations per ASME B30.9?

Accepted Answer

5:1

Answer

ASME B30.9 requires a minimum design factor of 5:1 for wire rope slings used in rigging.

Question 2

When a load is suspended from two sling legs with a 120-degree included angle between them, each leg carries approximately what percentage of the total load?

Accepted Answer

100%

Answer

At a 120-degree included angle, each sling leg carries 100% of the total load due to the increased tension from the wide angle.

Question 3

Which type of rigging hardware is used to change the direction of a wire rope without creating a fixed termination?

Accepted Answer

Snatch block

Answer

A snatch block (also called a redirect block) allows wire rope to change direction while the rope remains free to move through it.

Question 4

What is the correct procedure when a tag line is used during a crane lift?

Accepted Answer

Use it to guide the load without pulling the hook off center

Answer

Tag lines are used to guide and control load rotation without pulling the crane hook off-center, which could cause side loading.

Question 5

A pipefitter is rigging a horizontal pipe using a double-wrap choker hitch. Compared to a single choker, the double-wrap choker increases the rated capacity by approximately:

Accepted Answer

25%

Answer

A double-wrap choker hitch increases the rated capacity by approximately 25% compared to a single choker hitch.

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Pipefitter Rigging and Hoisting Operations 4