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API 5L Wall Thickness Calculator (Barlow)
First-pass minimum wall for internal pressure, by grade and location class. A design check — not a substitute for full code calculation.
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min wall — pressure (mm)
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+ corrosion allowance (mm)
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D/t ratio
// Barlow: t = (P × D) / (2 × SMYS × F). P converted bar→MPa (×0.1); longitudinal weld factor E = 1.0 for API 5L SMLS/SAW; temperature derating T = 1.0 (≤ 120 °C). Add mill tolerance and your corrosion allowance, then round up to a standard wall.
📐 Need this confirmed to ASME B31.4/B31.8 with mill tolerance? Talk to a Synbase pipe engineer — send OD, pressure and class for a verified wall and grade.
