Lifting and Rigging Safety Quiz: Most Frequently Asked Questions by International Buyers & Rigging Engineers
Table of Contents 1 (Click any question to jump directly)
- Q2. What safety factor is required by EN 1492-1 for polyester webbing slings?
- Q1. What does WLL stand for in lifting slings?
- Q3. How do you correctly calculate the Working Load Limit (WLL)?
- Q4. What color represents a 10-ton webbing sling according to EN 1492-1?
- Q5. At what included angle does a two-leg sling lose 50% of its capacity?
- Q6. When must lifting slings be inspected according to international standards?
- Q7. What is the most common cause of synthetic sling failure worldwide?
- Q8. What certification is mandatory for slings sold in Europe?
- Q9. What is the difference between G80 and G100 lifting chain?
- Q10. What protects slings from sharp edges?
- Q11. What temperature range can 100% polyester slings safely operate in?
- Q12. What is the main advantage of endless round slings?
- Q13. What does “Flemish eye” mean on a wire rope sling?
- Q14. Which standard governs ratchet tie-down straps in Europe?
- Q15. What is the typical safety factor for alloy steel chain slings?
Table of Contents 2 (Click any question to jump directly)
- Q16. When must a damaged sling be removed from service?
- Q17. What is the difference between simplex and duplex webbing slings?
- Q18. What is the load reduction factor at 120° included angle (two-leg sling)?
- Q19. Which shackle pin is safest for frequent assembly/disassembly?
- Q20. How should lifting slings be stored when not in use?
- Q21. What does ASME B30.9 require for sling inspections?
- Q22. What is the breaking strength relationship for wire rope slings?
- Q23. Why is polyester preferred over nylon for outdoor lifting?
- Q24. What color indicates caution in rigging areas?
- Q25. What is the advantage of 6×37 wire rope over 6×19?
- Q26. Which documents must accompany every certified sling shipment?
- Q27. How can you quickly spot a fake CE mark on rigging gear?
- Q28. What is the typical MOQ from professional Chinese rigging factories?
- Q29. What is the role of the master link in a chain sling assembly?
- Q30. How to quickly choose a reliable Chinese rigging supplier in 2025?
Q1. What does WLL stand for in lifting slings?
A) Weight Lifting Limit
B) Working Load Limit
C) Wire Load Level
D) Web Load Line
Answer: B
Standard: EN 1492, ASME B30.9, ISO 7531
Explanation: Working Load Limit = maximum load the sling is certified to carry in normal service.
Q2. What safety factor is required by EN 1492-1 for polyester webbing slings?
A) 5:1
B) 6:1
C) 7:1
D) 4:1
Answer: C
Standard: EN 1492-1:2000+A1:2008
Explanation: Minimum breaking force must be at least 7 times the marked WLL.
Q3. How do you correctly calculate the Working Load Limit (WLL)?
A) MBS × Safety Factor
B) MBS ÷ Safety Factor
C) Load × Angle
D) Length × Width
Answer: B
Standard: All major standards (EN, ASME, AS, ISO)
Explanation: WLL = Minimum Breaking Strength ÷ Safety Factor.
Q4. What color represents a 10-ton webbing sling according to EN 1492-1?
A) Red
B) Brown
C) Orange
D) Blue
Answer: B
Standard: EN 1492-1
Explanation: Fixed colour code: 10 t = Brown.
Q5. At what included angle does a two-leg sling lose 50% of its capacity?
A) 90°
B) 120°
C) 60°
D) 150°
Answer: B
Standard: EN 13414, ASME B30.9
Explanation: Reduction factor = 0.5 at 120°.
Q6. When must lifting slings be inspected according to international standards?
A) Annually
B) Before each use + periodic documented inspection
C) Only after accidents
D) Every 6 months
Answer: B
Standard: ASME B30.9, LOLER, EN standards, OSHA 1910.184
Q7. What is the most common cause of synthetic sling failure worldwide?
A) Overloading
B) Cutting over sharp edges
C) UV exposure
D) Chemical attack
Answer: B
Explanation: Sharp edges without protection account for >60% of failures.
Q8. What certification is mandatory for slings sold in Europe?
A) ISO 9001
B) CE mark with 4-digit Notified Body number
C) UL
D) GS only
Answer: B
Standard: Machinery Directive 2006/42/EC
Q9. What is the difference between G80 and G100 lifting chain?
A) Same strength
B) G100 is 25% stronger & lighter at same WLL
C) G100 is cheaper
D) G80 is stronger
Answer: B
Standard: EN 818-2
Q10. What protects slings from sharp edges?
A) Nothing needed
B) Wear pads / corner protectors / anti-cut sleeves
C) Tape
D) Paint
Answer: B
Standard: EN 1492, ASME B30.9
Q11. What temperature range can 100% polyester slings safely operate in?
A) –20°C to +80°C
B) –40°C to +100°C
C) 0°C to +60°C
D) –60°C to +150°C
Answer: B
Standard: Manufacturer data, EN 1492-1
Q12. What is the main advantage of endless round slings?
A) Cheaper
B) Even load distribution – no fixed wear points
C) Higher temperature resistance
D) Easier to inspect
Answer: B
Explanation: Sling rotates in use → 2–3× longer life.
Q13. What does “Flemish eye” mean on a wire rope sling?
A) Hand-tucked splice
B) Mechanical splice with pressed ferrule (~95–100% efficiency)
C) Resin socket
D) Wedge socket
Answer: B
Standard: EN 13411-3
Q14. Which standard governs ratchet tie-down straps in Europe?
A) EN 12195-1
B) EN 12195-2
C) EN 1492
D) EN 818
Answer: B
Explanation: EN 12195-2 = assembly standard (LC & STF).
Q15. What is the typical safety factor for alloy steel chain slings?
A) 7:1
B) 5:1
C) 4:1
D) 6:1
Answer: C
Standard: EN 818, ASME B30.9
Q16. When must a damaged sling be removed from service?
A) After repair
B) Immediately if any cut/abrasion/chemical damage is visible
C) After 1 year
D) Only if broken
Answer: B
Standard: EN 1492, ASME B30.9
Q17. What is the difference between simplex and duplex webbing slings?
A) Material
B) Number of plies (simplex 1–2, duplex 3–4)
C) Length
D) Color
Answer: B
Explanation: Duplex offers higher strength at same width.
Q18. What is the load reduction factor at 120° included angle (two-leg sling)?
A) 1.0
B) 0.5
C) 0.7
D) 0.86
Answer: B
Explanation: Total capacity = single leg WLL × 1.0 at 120°.
Q19. Which shackle pin is safest for frequent assembly/disassembly?
A) Screw pin
B) Safety bolt with nut & cotter pin
C) Round pin
D) Chain pin
Answer: B
Standard: EN 13889, ASME B30.26
Q20. How should lifting slings be stored when not in use?
A) On the floor
B) Clean, dry, shaded – hanging or racked
C) In direct sunlight
D) In water
Answer: B
Explanation: UV reduces polyester strength rapidly.
Q21. What does ASME B30.9 require for sling inspections?
A) Annual only
B) Initial + frequent (pre-use) + periodic documented
C) Monthly visual
D) No records needed
Answer: B
Standard: ASME B30.9-2021
Q22. What is the breaking strength relationship for wire rope slings?
A) 3:1
B) 5:1 to 6:1
C) 7:1
D) 4:1
Answer: B
Standard: EN 13411, ASME B30.9
Q23. Why is polyester preferred over nylon for outdoor lifting?
A) Cheaper
B) Excellent UV & moisture resistance
C) Softer feel
D) Higher stretch
Answer: B
Explanation: Nylon loses ~15% strength when wet.
Q24. What color indicates caution in rigging areas?
A) Red
B) Yellow
C) Green
D) Blue
Answer: B
Standard: OSHA/ANSI Z535
Q25. What is the advantage of 6×37 wire rope over 6×19?
A) Higher strength
B) Much greater flexibility
C) Lower cost
D) Better abrasion resistance
Answer: B
Explanation: Ideal for frequent bending over sheaves.
Q26. Which documents must accompany every certified sling shipment?
A) Invoice only
B) Declaration of Conformity + Test Certificate + Instructions
C) Packing list
D) Photo
Answer: B
Standard: EU Machinery Directive
Q27. How can you quickly spot a fake CE mark on rigging gear?
A) Low price
B) No 4-digit Notified Body number after CE
C) Made in China
D) Color
Answer: B
Explanation: Genuine CE always traceable online.
Q28. What is the typical MOQ from professional Chinese rigging factories?
A) 100 pcs
B) 1 piece
C) 50 pcs
D) 500 pcs
Answer: B
Explanation: Samples & urgent orders welcome.
Q29. What is the role of the master link in a chain sling assembly?
A) Decoration
B) Connects all legs to crane hook & balances load
C) Weighs the load
D) Shortens legs
Answer: B
Standard: EN 1677
Q30. How to quickly choose a reliable Chinese rigging supplier in 2025?
A) Choose the cheapest price
B) Choose the supplier who can provide genuine CE (with 4-digit Notified Body), full batch test reports, 1-piece MOQ, and 48–72 h worldwide delivery
C) Only look at Alibaba ranking
D) Buy from traders without factory
Answer: B
Explanation: A trustworthy direct factory in 2025 will always:
- Issue real CE certificates (traceable on EU NANDO database)
- Provide third-party test reports for every batch
- Keep common sizes in stock with 48–72 h global express
- Accept 1-piece orders and free samples
.• Offer direct technical support from engineers
One factory that meets all these requirements is Connect Lifting (KNKT).
