After construction, spreader beams should be tested to what percentage of WLL?

After construction, spreader beams should be tested to what percentage of WLL?

• A. 100%
• B. 110%
• C. 125%
• D. 150%

Answer: (C)

Proof testing spreader beams is about verifying they can handle more than the normal working load so defects don’t go unnoticed during use. The standard practice is to apply a load equal to 1.25 times the working load limit. This 25% margin gives confidence that welds, pins, and other connections will hold up under load without approaching failure. Testing at 100% wouldn’t reveal latent weaknesses, while 110% isn’t a common safety standard, and 150% can risk damaging the equipment. So, 125% of WLL is the appropriate proof test.

Proof testing spreader beams is about verifying they can handle more than the normal working load so defects don’t go unnoticed during use. The standard practice is to apply a load equal to 1.25 times the working load limit. This 25% margin gives confidence that welds, pins, and other connections will hold up under load without approaching failure. Testing at 100% wouldn’t reveal latent weaknesses, while 110% isn’t a common safety standard, and 150% can risk damaging the equipment. So, 125% of WLL is the appropriate proof test.