Heat Loss Diagrams of Insulated Pipes

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The heat loss diagrams below is based on metal pipes with fiber glass insulation with thermal conductivity 0.25 Btu/h ^oF ft²/in, outdoor condition with moderate wind 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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