Tubing has 3 cross-sectional measures – inner diameter, outer diameter and wall thickness. If 2 of the measures are given then the third can be determined.
tubing outer diameter (OD) =
= (tubing inner diameter ID) + (2 * (wall thickness))
area of lumen =
= (((inner diameter) / 2)^2) * PI()
area filled by tube =
= (((outer diameter) / 2)^2) * PI() =
= ((((ID) / 2) + (wall thickness))^2) * PI()
area of wall material =
= (area filled by tube) – (luminal area) =
= ((ID) + (wall thickness)) * (wall thickness) * PI()
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