Thermal resistance of jacket

Symbol
$T_{3}$
Unit
K.m/W
Formulae
$\frac{\rho_{j} \ln{\left(\frac{D_{e}}{D_{e} - 2 t_{3}} \right)}}{2 \pi}$general case
$1.6 T_{3}$(part-)metallic sheathed single-core cables in trefoil formation
$\frac{\ln{\left(\frac{d_{prot}}{d_{encl}} \right)}}{2 k_{prot} \pi}$GIL
Related
$D_{e}$
Used in
$\delta \theta_{c}$
$\theta_{c_{z}}$
$\theta_{e}$
$U_{wall}$
OHTC of pipe wall [W/(K.m$^2$)]