Metal mesh slings must be removed from service if a reduction in wire diameter due to corrosion reaches what percentage?

Metal mesh slings must be removed from service if a reduction in wire diameter due to corrosion reaches what percentage?

• A. 5%
• B. 15%
• C. 25%
• D. 35%

Answer: (B)

Metal mesh slings rely on the wire’s cross-sectional area to carry the load. When corrosion thins the wire, the sling’s strength drops. If the diameter is reduced by 15%, the remaining area is enough to significantly weaken the sling (about a 28% loss in cross-sectional area), so it must be taken out of service. This 15% limit provides a practical safety margin because corrosion can be uneven, and further wear could lead to failure. Look for additional damage like broken wires or deformation, which also warrants removal regardless of the remaining diameter.

Metal mesh slings rely on the wire’s cross-sectional area to carry the load. When corrosion thins the wire, the sling’s strength drops. If the diameter is reduced by 15%, the remaining area is enough to significantly weaken the sling (about a 28% loss in cross-sectional area), so it must be taken out of service. This 15% limit provides a practical safety margin because corrosion can be uneven, and further wear could lead to failure. Look for additional damage like broken wires or deformation, which also warrants removal regardless of the remaining diameter.