MASS MASS Test Rigging and Slings 1 — Questions and Answers
Question 1: What is the primary purpose of a rigging inspection before a lift?
- To determine the load's center of gravity
- To identify defects that could cause failure during the lift (Correct answer)
- To calculate the headroom needed
- To measure the rope diameter
Correct answer: To identify defects that could cause failure during the lift
Pre-lift inspections identify defects such as cuts, kinks, or corrosion that could cause rigging to fail under load.
Question 2: Which sling type offers the greatest flexibility and is best suited for irregular-shaped loads?
- Wire rope sling
- Chain sling (Correct answer)
- Web sling
- Roundsling
Correct answer: Chain sling
Chain slings are highly flexible, durable, and conform well to irregular load shapes while withstanding heat and abrasion.
Question 3: What does the term 'Working Load Limit' (WLL) mean in rigging?
- The maximum load a sling can carry under ideal conditions (Correct answer)
- The weight of the rigging hardware itself
- The load applied during proof testing
- The breaking strength divided by 10
Correct answer: The maximum load a sling can carry under ideal conditions
Working Load Limit is the maximum load a piece of rigging equipment is rated to carry under normal, intended conditions.
Question 4: When a sling is used in a basket hitch, how does the rated load capacity change compared to a straight vertical hitch?
- It decreases by 50%
- It remains the same
- It increases up to 2 times (Correct answer)
- It increases by 10%
Correct answer: It increases up to 2 times
A basket hitch distributes the load across two legs, which can increase the rated capacity up to twice that of a single vertical hitch.
Question 5: Which condition requires a wire rope sling to be immediately removed from service?
- Minor surface oxidation
- Six randomly distributed broken wires in one lay (Correct answer)
- Slight stiffness after storage
- Visible rope twist from previous use
Correct answer: Six randomly distributed broken wires in one lay
ASME B30.9 requires removal of wire rope slings with six or more randomly distributed broken wires in one rope lay.
Question 6: What is the correct action if a synthetic web sling shows cuts, burns, or chemical damage?
- Reinforce it with tape and continue use
- Reduce the rated load by 25% and continue
- Remove it from service and destroy it (Correct answer)
- Return it to the manufacturer for repair
Correct answer: Remove it from service and destroy it
Synthetic web slings with cuts, burns, or chemical damage must be removed from service and destroyed to prevent accidental reuse.
MASS MASS Test Rigging and Slings 1
What is the primary purpose of a rigging inspection before a lift?