Pipe Wall Thickness (ASME B31.1)

Minimum pipe wall thickness from ASME B31.1: t = P·D / (2·(SE + PY)) + c, with corrosion allowance c.

StructuralPiping

Design pressurebarOutside diametermmAllowable stressN/mm²Weld-joint efficiency E - Temperature coefficient Y - Corrosion allowancemm

Required wall thickness: 2.40mm

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Formula, assumptions, and limits

t = \frac{P \cdot D}{2 (S \cdot E + P \cdot Y)} + c

Symbol	Meaning	Unit
$P$	Design pressure	N/mm² (from bar)
$D$	Outside diameter	mm
$S$	Allowable stress	N/mm²
$E$	Weld-joint efficiency (seamless = 1)
$Y$	Temperature coefficient
$c$	Corrosion allowance	mm

Source: ASME B31.1 Power Piping; ASME B31.3 Process Piping

In short

Minimum pipe wall thickness from ASME B31.

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