Proof load testing is used for lifting equipment, and used to detect any defects in materials used or the manufacturing of the equipment. The load during the test depends on the application and standard used.
Proof Load Testing Levels
The load used during test depends on different factors, for example standard EN 12999 for loader cranes specifies a load of 1.25 x work load need to be used in a static test before used. It is all about increased safety and using a safety factor to compensate for unforeseen events.
A general rule of thumb is, the more of the factors that are unknown during a design process, the higher the safety factor should be. Looking at a hoist rope then the minimum breaking load should be five times higher than the specified working load. This compensates for unknowns like how it is used, wear, corrosion etc.
When to Perform Proof Load Testing
As the proof load test ensures the equipment performs according to the standard within the manufactures specifications, the test is used on other occasions than just when the equipment is produced.
Some of the other scenarios where a test would be required, are after a structural repair, full service or when an incident happens.
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