# Overall outer diameter of pipe

Outer diameter of the pipe, over the outer protective and insulating cover.

For cables, heat sources and GIL, we consider $D_{ext}$ to be the outer diameter $D_{o}$ in meters.

Symbol
$D_{ext}$
Unit
m
Formulae
$D_{o}$
Related
$D_{o}$
$\beta_{b}$
$\mathrm{Bi}_{g}$
$\mathrm{Bi}_{p}$
$D_{soil}$
$e_{limit}$
$h_{amb}$
$h_{buried}$
$h_{ext}$
$h_{ground}$
$h_{soil}$
$I_{c}$
$\mathrm{Re}_{w}$
$T_{4iii}$
$U_{buried}$
$U_{wall}$
OHTC of pipe wall [W/(K.m$^2$)]