supposedly the hook failed and boom slingshot over the top.
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FacengrPE said:So on a barge or ship mounted cranes is the backwards boom stability with maximum dynamic hull rotation in a loss of load event a required consideration when designing the load chart?
JStephen said:But still, it had to have failed at just a fraction of its intended strength.
The system may not have the moment capacity to test the hook at a low angle. Although this is interesting to think about. The moments have to zero out. Is the system safe from the failure mode of flicking the boom over at a low angle? This may not be too hard a problem to solve with energy methods.Pete K said:I'd imagine a "lesson learned" coming out of this is to evaluate the repercussions of a hook failure when the boom is at such a high angle, and that there should probably be progressive testing at lower angles (and necessarily lower loads) before getting to that point.