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Beam Splices

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a recent phone discussion with a steel detailer has arisen some questions i have.
 
i usually locate beam splices in a beam line where the moment is zero, typically it's somewhere around 4'-0" to 6'-0".  but the particular project i was discussing with the detailer has larger spans than what i'm used to seeing and splices came out to be lager than 6'-0", for example, i have one at 8'-8" and a few 7'-0".  the detailer seemed to think these were not pratical locations, ie he's never seen ones this long before.  but maybe he hasn't done a large building yet? 
 
my questions are, am i wrong in placing splices so far?  is there some praticallity issue in regards to erecting a beam line with a splice this large?  any 'rules of thumb' i haven't learned?  is there a maximum and minimum distance in the steel manual?
 
TIA

Alden Manipula
Structural E.I.T.
www.novagroupinc.net