Crane Tipping Factor of Safety
Crane Tipping Factor of Safety
(OP)
I'm working on modifying an existing overhead crane. This crane is not a traditional design, it is a derrick style crane. In looking at the seismic analysis, the original design loads were quite low. We are going to try to qualify this crane for the higher seismic loading criteria, and I'm starting to wonder, what is the standard factor of safety against tipping for crane design? Any pointers would be greatly appreciated.
Also, I talked to the original vendor, they suggest a 5 to 1, I think that is a little high, but share your thoughts please.
Also, I talked to the original vendor, they suggest a 5 to 1, I think that is a little high, but share your thoughts please.






RE: Crane Tipping Factor of Safety
Not sure what it should be though.
RE: Crane Tipping Factor of Safety
RE: Crane Tipping Factor of Safety
I've always known 1.5 to 1 for tipping factors, but I can't find anywhere that advices using the higher FOS of 5 to 1.
RE: Crane Tipping Factor of Safety
I seem to recall 5 to 1 being the correct FOS.
RE: Crane Tipping Factor of Safety
RE: Crane Tipping Factor of Safety
I will say this much, the crane I'm asking about is our fuel handling crane, so I wouldn't be surprised if I have to go with the FOS of 5 to 1...
One thing I have found, but it doesn't directly apply to cranes, is in an NRC publication that says 1.5 to 1 for foundation designs, can be reduced to 1.1 to 1 for overturning. However, I don't want to misuse the guidance for foundations to apply to a crane trolley.
RE: Crane Tipping Factor of Safety
RE: Crane Tipping Factor of Safety
RE: Crane Tipping Factor of Safety
RE: Crane Tipping Factor of Safety
RE: Crane Tipping Factor of Safety
RE: Crane Tipping Factor of Safety
However, nuclear requires seismic design, so we design for it.
And it would be impossible to stand under this crane unless you were swimming in the pool, which I would not advise under any scenario.
RE: Crane Tipping Factor of Safety
Interfacing structures and foundations shall be designed such that the maximum resisting moment against overturning (based upon dead load plus rated load) will provide a safety factor of 2.
This seems fairly reasonable, not too low from a risk perspective, largely from the possibility of the loading combintation to ever be experienced by the crane being close to zero.
RE: Crane Tipping Factor of Safety
RE: Crane Tipping Factor of Safety