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

A wire rope sling used in a choker hitch has a rated load capacity of 75 percent of its vertical (straight) hitch rating, due to the bend angle and stress concentration at the choker point.

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

A sliding pipe support or roller support allows unrestricted axial movement of the pipe due to thermal expansion and contraction while providing full vertical load support, preventing pipe sag.

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

A variable spring hanger supports the pipe's dead weight load while allowing controlled vertical movement during thermal expansion or contraction, preventing the pipe from going into tension or overloading nozzles as it moves vertically.

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

OSHA 1926.1416 requires a pre-shift visual inspection of the crane by the operator before each shift and after any event that could affect safety (such as an overload or collision), checking wire ropes, hooks, brakes, and outriggers.

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

A proof load test applies a load of typically 2 times the working load limit (WLL) to rigging hardware such as shackles, hooks, and slings at the factory to verify they can handle overload conditions without permanent deformation, cracking, or failure.

Certified Pipefitter Practice Test

Certified Pipefitter Practice Test

Pipefitter Rigging, Hangers, and Supports 2