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eng.pressure-vessel-thickness Calculator
Calculates minimum pressure vessel wall thickness from design pressure, vessel diameter, and allowable stress per ASME Section VIII. The ASME Section VIII thin-wall formula t = PR/SE applies when t < R/10 — thicker vessels require the exact thick-wall (Lamé) equations.
Inputs
Internal Pressure Mpa
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Inner Radius Mm
Distance from centre to edge of a circle. Radius = diameter / 2.
Allowable Stress Mpa
Internal force per unit area (Pa or MPa). Must stay below yield strength in service.
Corrosion Allowance Mm
Reference formula or conversion factor shown for context.
Results
required wall thickness (mm)
Sample size or count used in the calculation.
calculated thickness (before CA)
The value at the specified point or condition.
corrosion allowance
Sample size or count used in the calculation.
ASME formula: t = PR/(SE-0.6P)
The specific form or variant of the result.
hoop stress at t_req
Internal force per unit area (Pa or MPa). Must stay below yield strength in service. Beyond yield: permanent deformation. Beyond tensile strength: fracture.
safety factor
A dimensionless multiplier applied in the calculation.