Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Heat loss (W/ft) diagrams for 1/2 to 6 inches insulated pipes - ranging insulation thickness 0.5 to 4 inches and temperature differences 50 to 350 degF.
The heat loss diagrams below is based on metal pipes with fiber glass insulation, thermal conductivity
0.25 Btu/h and outdoor condition with moderate wind oF ft 2/in 20 mph. A safety factor of 10% is included. indoor location - reduce values with 10% mineral wool insulation - increase values with 6% rigid cellular polyurethane - reduce values by 30% Heat loss diagram (W/ft) Pipe Heat Loss - Insulation thickness 4 inches
1 W/ft = 3.41 Btu/h ft = 3.28 W/m 1 oF = 0.555 oC Pipe Heat Loss - Insulation thickness 3 inches
Pipe Heat Loss - Insulation thickness 2.5 inches
Pipe Heat Loss - Insulation thickness 2 inches
Pipe Heat Loss - Insulation thickness 1.5 inches
Pipe Heat Loss - Insulation thickness 1 inch
Pipe Heat Loss - Insulation thickness 0.5 inches
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