Associate Safety Professional Practice Exam

What is the required proof test weight for a 40 ton gantry crane that has been out of service for more than 6 months?

1. 40 tons

2. 50 tons

3. 60 tons

4. 70 tons

The correct answer is: 50 tons

The correct answer is based on the typical practice for proof testing a gantry crane that has been out of service for an extended period, such as six months. When a crane is not in use for a significant duration, it is essential to ensure its integrity and load-bearing capabilities are still adequate. For a 40-ton gantry crane, the proof test weight is generally determined by applying a safety factor. A common safety practice dictates that the proof test load should be 125% of the crane's rated capacity. Therefore, for a crane with a rated capacity of 40 tons, calculating 125% results in a proof test weight of 50 tons (40 tons x 1.25 = 50 tons). This testing ensures that all components of the crane are functioning properly and can handle more than the rated capacity safely, confirming its reliability before returning it to service. The other options presented do not align with this industry standard for proof testing. They either fall below the necessary safety factor or exceed it without justification based on typical safety practices. For example, a proof test weight of 60 tons or 70 tons may be used in specific scenarios or organizational procedures, but standard guidelines for a 40-ton crane typically require a 50-ton load