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Table 1: Minimum Insulation Thickness for Circulating Hot Water Pipes. <br /> Insulation Thickness in Inches by Pipe Sizes <br /> Heated Water Non-Circulating Runouts Circulating Mains and Runouts <br /> Temperature(F) Up to 1" Up to 1.25" 1.5" to 2.0" Over 2" <br /> 170-180 0.5 1.0 1.5 2.0 <br /> 140-169 0.5 0.5 1.0 1.5 <br /> 100-139 0.5 0.5 0.5 1.0 <br /> Table 2: Minimum Insulation Thickness for HVAC Pipes. <br /> Fluid Temp. Insulation Thickness in Inches by Pipe Sizes <br /> Piping System Types Range(Fl, 2" Runouts 1" and Less 1.25" to 2" 2.5" to 4" <br /> Heating Systems <br /> Low Pressure/Temperature 201-250 1.0 1.5 1.5 2.0 <br /> Low Temperature 120-200 0.5 1.0 1.0 1.5 <br /> Steam Condensate(for feed water) Any 1.0 1.0 1.5 2.0 <br /> Cooling Systems <br /> Chilled Water, Refrigerant, 40-55 0.5 0.5 0.75 1.0 <br /> and Brine Below 40 1.0 1.0 1.5 1.5 <br /> NOTES TO FIELD(Building Department Use Only) <br />