# Outer diameter of steel pipe

Outer diameter of the steel pipe excluding outer protective cover.

For cables, heat sources and PAC/GIL, we consider $D_{wall}$ to be the diameter below the outer sheath, the insulation over the pipe or the protective cover respectively.

Symbol
$D_{wall}$
Unit
m
Formulae
 $\frac{D_e-2t_j}{1000}$ Cables $\frac{do_{pipe}}{1000}$ Heat sources $\frac{D_{encl}}{1000}$ PAC/GIL
Related
$D_e$
$D_{encl}$
$do_{pipe}$
$t_j$
Used in
$D_{ref}$
$T_{wall}$
$U_{buried}$
$U_{inwall}$
$U_{wall}$
OHTC of pipe wall [W/(K.m$^2$)]