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Thermal resistance armour bedding

Symbol
$T_{ab}$
Unit
K.m/W
Formulas
$\frac{\rho_{ab}}{2\pi} \ln\left(\frac{D_{ab}}{F_x D_{shj}}\right)$multi-core cables type SS
$\frac{\rho_{ab}}{2\pi} \ln\left(\frac{D_{ab}}{D_{shj}-\Delta d_{sh}}\right)$otherwise
Related
$D_{ab}$
Diameter over armour bedding [mm]
$D_{shj}$
Diameter over sheath jacket [mm]
$\Delta d_{sh}$
Depth of corrugation [mm]
$F_x$
Geometrical distance factor for multi-core cables
$\pi$
Archimedes' constant $\pi$
$\rho_{ab}$
Thermal resistivity armour bedding [K.m/W]
Used in
$R_{c3}$
Thermal resistance part 3 [K.m/W]
$T_2$
Thermal resistance armour bedding [K.m/W]