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eng.pipe-wall-thickness Calculator
Calculates minimum pipe wall thickness from design pressure, pipe diameter, and material allowable stress per ASME B31.3. The Barlow formula (t = PD/2SE) with appropriate code factors gives the minimum thickness — corrosion allowance and mill tolerance are added.
Inputs
Od Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Pressure Mpa
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Yield Mpa
Stress at which permanent deformation begins. Design loads should stay below this — apply a safety factor of 1.5–3×.
Sf
Strength divided by expected load. FoS of 2 means the structure can take twice the design load. Lifting equipment: 4–6. Buildings: 1.5–3.
Results
min wall thickness (mm)
Sample size or count used in the calculation.
with mill tolerance (mm)
Sample size or count used in the calculation.
allowable stress (MPa)
Internal force per unit area (Pa or MPa). Must stay below yield strength in service. Beyond yield: permanent deformation. Beyond tensile strength: fracture.
Barlow formula: t=PD/2S
The specific form or variant of the result.
safety factor
A dimensionless multiplier applied in the calculation.
ID (mm)
Reference formula or conversion factor shown for context.