Insulated Pipe Heat Loss
Calculate heat loss per metre and in total from an insulated pipe, free online.
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Conduction through a cylindrical insulation layer: Q per metre = 2π·k·(T_fluid − T_ambient) ÷ ln(r₂ ÷ r₁), where r₁ is the pipe outside radius and r₂ = r₁ + insulation thickness. Typical k: mineral wool 0.04 W/m·K, polyurethane foam 0.025, fibreglass 0.035. Surface film resistance is ignored, so real losses are slightly lower.