Longitudinal Stress Thick-walled Section (Internal & External Pressure)

Longitudinal Stress Thick-walled Section (Internal & External Pressure) Formula
\( \sigma_l \;=\; \dfrac{ p_i \cdot r_i^2 - p_e \cdot r_e^2 }{ r_e^2 - r_i^2 }\)
Symbol	English	Metric
\( \sigma_l \) (Greek symbol sigma) = longitudinal stress	\(lbf\;/\;in^2\)	\( Pa \)
\( p_e \) = external pressure	\(lbf\;/\;in^2\)	\( Pa \)
\( p \) = internal pressure	\(lbf\;/\;in^2\)	\( Pa \)
\( r_e \) = external radius	\( in \)	\( mm \)
\( r_i \) = internal radius	\( in \)	\( mm \)