Cross-sectional area of jacket

Symbol
$A_{j}$
Unit
mm$^2$
Formulae
$\frac{\pi \left(D_{e}^{2} - \left(D_{e} - 2 t_{j} - 2 t_{jj}\right)^{2}\right)}{4}$
Related
$D_{e}$
Used in
$Q_{j}$