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External diameter of armour

Symbol
$D_{ar}$
Unit
mm
Formulae
$D_{ab}+2\left(t_{a,1}+t_{a,2}\right)$
Related
$D_{ab}$
Diameter over armour bedding [mm]
$t_{a,1}$
Thickness of 1st armour [mm]
$t_{a,2}$
Thickness of 2nd armour [mm]
Used in
$C_{ag}$
Capacitance armour - ground [F/m]
$D_j$
Diameter over jacket [mm]
$p_{ab}$
Factor apportioning the armour bedding
$p_j$
Factor apportioning the jacket
$r_{z5}$
Radius of armour (outer) [m]
$\rho_{ar}$
Specific electrical resistivity of armour material [$\Omega$.m]