Pipefitter Rigging, Hangers, and Supports 2

Question 1

When using a wire rope sling in a choker hitch configuration, the rated capacity is reduced to what percentage of its vertical hitch capacity?

Accepted Answer

75%

Answer

100%

Answer

80%

Answer

60%

Question 2

What type of pipe hanger is designed to allow the pipe to move axially (along its centerline) while still providing vertical support?

Accepted Answer

Sliding pipe support or roller support

Answer

Rigid hanger

Answer

Constant spring hanger

Answer

Anchor (fixed point)

Question 3

What is the purpose of a spring can (variable spring hanger) in a piping system?

Accepted Answer

To support pipe weight while allowing limited vertical movement due to thermal expansion, maintaining continuous load support

Answer

To provide a fixed support point that prevents all pipe movement

Answer

To anchor the pipe to the structure to absorb anchor forces

Answer

To act as a vibration dampener for pump discharge lines

Question 4

Per OSHA 1926.1416, before a mobile crane is used for lifting operations, what must the operator do?

Accepted Answer

Conduct a pre-shift visual inspection of the crane and all associated rigging equipment

Answer

Sign a verbal agreement with the rigger confirming the lift

Answer

File a lift permit with OSHA before beginning

Answer

Test the crane at 125 percent of rated load before each shift

Question 5

What does the term 'proof load test' mean in the context of rigging hardware?

Accepted Answer

Loading the equipment to a multiple (typically 2x) of the WLL to verify structural integrity without permanent deformation

Answer

Testing the rigging equipment at exactly its rated working load limit (WLL)

Answer

A field test performed before every lift to verify sling condition

Answer

Testing a new crane at 110 percent of its rated load

Question 6

When calculating the load on each leg of a two-leg bridle sling, what is the effect of decreasing the sling angle (angle between the sling leg and horizontal)?

Accepted Answer

Decreasing the angle increases the load per leg, requiring a higher rated sling

Answer

Decreasing the angle reduces the load per leg

Answer

Decreasing the angle has no effect on leg tension

Answer

Decreasing the angle only affects the horizontal force, not the vertical