The proof load test simulates what loading condition?

The proof load test simulates what loading condition?

• A. 100% of WLL
• B. 120% of WLL
• C. 150% of WLL
• D. 200% of WLL

Answer: (D)

A proof load test is meant to show that gear can withstand loads well beyond what it is rated to carry, creating a safety margin and revealing any hidden flaws. By applying a load equal to twice the Working Load Limit (200% of WLL) and holding it for a specified time, the test simulates peak or shock loading conditions that could occur in service. The goal is not to test normal operating loads, but to verify the device will not yield, deform permanently, or fail when pushed above its rated capacity. For example, a sling with a WLL of 2,000 pounds would be tested to 4,000 pounds. Smaller overshoots like 120% or 150% are less demanding and may not provide the same assurance required by standard proof testing, which is why the 200% figure is used.

A proof load test is meant to show that gear can withstand loads well beyond what it is rated to carry, creating a safety margin and revealing any hidden flaws. By applying a load equal to twice the Working Load Limit (200% of WLL) and holding it for a specified time, the test simulates peak or shock loading conditions that could occur in service. The goal is not to test normal operating loads, but to verify the device will not yield, deform permanently, or fail when pushed above its rated capacity. For example, a sling with a WLL of 2,000 pounds would be tested to 4,000 pounds. Smaller overshoots like 120% or 150% are less demanding and may not provide the same assurance required by standard proof testing, which is why the 200% figure is used.