What is the maximum unsupported length for standard W beams in crane design?

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itscolfax
I just was hired as a junior engineer at a crane manufacturer. My boss asked me to determine the maximum length without a cap of each standard W beam we use. I know long slender beams fail by lateral torsional buckling. I guess I need to find at what length at a given load will a beam fail in this manner. Any help would greatly be appreciated! Thanks!
 
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