Pressure Vessel Design Calculator
Design cylindrical pressure vessels per ASME Section VIII. Calculate minimum wall thickness, hoop stress, and longitudinal stress.
Inputs
psi
in
psi
in
Results
Min Wall Thickness
0.24 in
Selected Plate Thickness
0.38 in
Design Thickness (+ CA)0.37 in
Hoop Stress17,047 psi
Longitudinal Stress8,471 psi
How to Use This Calculator
- Enter the Internal Pressure (P) in psi — this is the maximum allowable working pressure (MAWP) including any overpressure scenario.
- Enter the Inner Radius (R) in inches — half the inside diameter of the cylindrical shell.
- Look up the Allowable Stress (S) in psi from ASME Section II for your material and design temperature: SA-516 Gr70 ≈ 17,500 psi at ambient.
- Set the Joint Efficiency (E): full radiography = 1.0, spot radiography = 0.85, no radiography = 0.70.
- Enter the Corrosion Allowance in inches to add service life margin — typically 1/16" to 1/8" for process vessels.
- Review the Minimum Wall Thickness and Selected Plate Thickness, then verify the Hoop Stress and Longitudinal Stress remain within the material allowable.
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