# Surface of object

When several cables are present, the mutual radiant area between them must be subtracted from the area radiating to the riser inner surface.

Symbol
$A_{er}$
Unit
m$^2$
Formulae
 $\pi D_o$ single cable $2\left(1-0.182\right) \pi D_o$ two cables touching $3\left(\pi-0.618\right) D_o$ three cables touching trefoil
Related
$D_o$
Used in
$W_{rad,od}$