Equivalent pipe resistance calculator

The equivalent thickness can be substituted in the flat-surface resistance expression.

Units

R_{\text{ins}} = \frac{d'}{K}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

R_{\text{ins}} = \frac{2.74}{0.29} \approx 9.448

Symbol	Meaning	Unit
$R_{\text{ins}}$	insulation resistance based on outside insulated area	h·ft²·°F/Btu
$d'$	equivalent thickness	in
$K$	conductivity	Btu·in/(h·ft²·°F)

Symbol	Meaning	Unit
$R_{\text{ins}}$	insulation resistance based on outside insulated area	m²·K/W
$d'$	equivalent thickness	m
$K$	conductivity	W/(m·K)

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.