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PXUV.X772 - Fire Resistance Ratings - ANSVUL 263 Pagel of 3 <br />4i 13NLINE-- - C77-C? <br />BXUV.X772 <br />Fire Resistance Ratings - ANSI/UL 263 <br />Page-BottQ .' <br />Fire Resistance Ratings - ANSI/UL 263 <br />SeeS:QueraJN.:mtaLoatnr FirsBes�siance.flatinos - Arv51/S11]-43 <br />Design No. X72:t <br />March 13, 2007 <br />Ratings — 1, 1-1/2, 2, 3 and 4 h. <br />1. Spray -Applied Fire Resistive Materials- — APPlled by mixing with water and spraying in more than one coat to the <br />thicknesses shown below, to steel surfaces which are clean and free of dirt, loose scale, and oil. Min avg and min ind <br />density of 15/14 pcf respectively. Min avg and min ind density of 22/19 pcf respectively for Types Z-106, Z-106/G. Min avg <br />and min ind density of 19/18 pcf respectively for Types 7GP and 7HD. For method of density determination, see Design <br />Information Section, Sprayed Material. <br />The thickness of Spray -Applied Fire Resistive Materials to be applied to all surfaces of the column (Item 1) required for <br />rating periods of 1 h, 1-1/2 h, 2 h, 3 h, 4 h may be determined by the equation: <br />h = R <br />1.05 (W/D) + 0.61 <br />Where: <br />I: = Spray -Applied Fire Resistive Materials thickness in the range 0.25-3.875 in. <br />R = Fire resistance rating in hours (1 - 4 h) <br />D = Heated perimeter of steel column in inches <br />W = Weight of steel column in Ras per foot <br />W/D - 0.33 to 6.62 <br />As an alternate to the equation, the minimum thickness of Spray -Applied Fire Resistive Materials required for various fire <br />resistance ratings of contour sprayed or boxed columns may be determined from the table below: <br />http://database.ul.cor..i cgi-bitt/XYV/template/LISEXT/I FRAME/showpage.html?name 11/14/2007 <br />