Rigging, Hangers, and Supports Flashcards
6 cards from real PIPEFITTER practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Rigging, Hangers, and Supports flashcards as text
When using a wire rope sling in a choker hitch configuration, the rated capacity is reduced to what percentage of its vertical hitch capacity?
Answer: 75%
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.
What type of pipe hanger is designed to allow the pipe to move axially (along its centerline) while still providing vertical support?
Answer: Sliding pipe support or roller support
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.
What is the purpose of a spring can (variable spring hanger) in a piping system?
Answer: To support pipe weight while allowing limited vertical movement due to thermal expansion, maintaining continuous load support
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.
Per OSHA 1926.1416, before a mobile crane is used for lifting operations, what must the operator do?
Answer: Conduct a pre-shift visual inspection of the crane and all associated rigging equipment
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.
What does the term 'proof load test' mean in the context of rigging hardware?
Answer: Loading the equipment to a multiple (typically 2x) of the WLL to verify structural integrity without permanent deformation
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.
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)?
Answer: Decreasing the angle increases the load per leg, requiring a higher rated sling
As the bridle sling angle from horizontal decreases (sling legs become more horizontal), the tension in each sling leg increases significantly. At 30 degrees from horizontal, each leg carries twice the load it would at 90 degrees (straight up).