api 2218

And as discussed in 4.2.5.2 the rating is for a specific configuration so if a certain fireproofing material applied to a W10x49 steel beam provides a 1-1/2 hour rated column, one cannot expect the same thickness of material applied to a light-weight beam or to sheet steel would allow either to survive for 1-1/2 hours with the same fire exposure. ................
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