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Equipment# : WR-HR-10 <br /> STI /Category 3 Calculation <br /> Calculation is Original Thickness*75% <br /> t= Original Thickness t= 0.179 <br /> Tmin =Minimum Thickness Required Tmin = 0.134 <br /> STI /Category 2 Calculation <br /> Calculation is Original Thickness*75% <br /> t=Original Thickness t= 0.179 <br /> Tmin =Minimum Thickness Required Tmin = 0.134 <br /> 3 sq. inches of any 1 sq. foot discovered. <br /> OR <br /> STI /Category 2 Calculation <br /> Calculation is Original Thickness*50% <br /> t=Original Thickness t= 0.179 <br /> Tmin =Minimum Thickness Required Tmin = 0.090 <br /> Any Point <br /> STI/Category 1 Calculation <br /> Calculation is Original Thickness *50% <br /> t=Original Thickness t= 0.179 <br /> Tmin = Minimum Thickness Required Tmin = 0.090 <br /> 3 sq. inches of any 1 sq. foot discovered. <br /> OR <br /> Calculation is Original Thickness*50% <br /> t=Original Thickness t= 0.179 <br /> Tmin =Minimum Thickness Required Tmin = 0.045 <br /> Any Point <br />