ASME B31.3 — para. 304.1.2

Process piping thickness

Required wall thickness for straight pipe under internal pressure. t = P·D / [2(S·E + P·Y)] + corrosion allowance.

Inputs

Design pressurepsig

Outside diameterin

Allowable stress Spsi

ASME B31.3 Table A-1 at design T

Weld joint efficiency E—

Table A-1B. 1.0 for seamless.

Y-factor—

Table 304.1.1. 0.4 typical for ferritic steels < 900°F.

Corrosion allowancein

Nominal supplied thicknessin

Sch 40 6-NPS = 0.280 in.

Pipe — longitudinal section

Wall thickness drawn at the actual t/OD ratio · flow direction → · ε on inner wall.

Enter inputs and click Compute.