Formula:

σ_a =((p_i x r_i² - p_o x r_o²) / (r_o² - r_i²)) - (r_i² x r_o²(p_o - p_i) / (r² x (r₀² - r_i²))


Where,
σ_a = Hoop (Circumferential) Stress in Cylindrical Wall or Tube
p_i = Internal Pressure in the Tube
p_o = External Pressure in the Tube
r_i = Internal Radius in the Tube
r_o = External Radius in the Tube
r = Radius to point in tube

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