Which standard requires a minimum design factor of 4 for shackles over 150 ton rated load?

Which standard requires a minimum design factor of 4 for shackles over 150 ton rated load?

• A. ASME B30.26
• B. ASME B30.9
• C. OSHA 1910.184
• D. NFPA 70

Answer: (A)

Shackles must have a built-in safety margin because loads can spike, become misaligned, or involve dynamic effects. The design factor, or safety factor, represents how much stronger the hardware must be than the maximum load it is expected to carry. For large shackles, standards specify a design factor of 4 when the rated load exceeds 150 tons, ensuring the breaking strength is at least four times the working load to provide ample margin for safety. This requirement is found in ASME B30.26, which specifically governs rigging hardware like shackles. The other standards listed focus on different equipment or contexts (slings, general sling safety, or electrical installations) and do not mandate this particular design-factor for large shackles.

Shackles must have a built-in safety margin because loads can spike, become misaligned, or involve dynamic effects. The design factor, or safety factor, represents how much stronger the hardware must be than the maximum load it is expected to carry. For large shackles, standards specify a design factor of 4 when the rated load exceeds 150 tons, ensuring the breaking strength is at least four times the working load to provide ample margin for safety.

This requirement is found in ASME B30.26, which specifically governs rigging hardware like shackles. The other standards listed focus on different equipment or contexts (slings, general sling safety, or electrical installations) and do not mandate this particular design-factor for large shackles.