Pressure Piping Minimum Wall Equations and Calculator:

ASME Pressure Vessel Design and Engineering

ASME I and ASME-ANSI B31 – Pressure Piping - Minimum Wall Thickness: Equations and Calculator:

ASME Section I and ANSI B31, the minimum thickness of piping under pressure is:

ASME Pipe Pressure Equation

or

thickness of piping under pressure

For For t ≥ D/6 or for P/SE > 0.385, calculation of pressure design thickness for straight pipe requires special consideration of factors such as theory of failure, effects of fatigue, and thermal stress.

Preview Pressure Piping Minimum Wall Thickness Calculator

t (min)= Minimum wall thickness required (in);
P = Design pressure (psig);
D = Outside diameter of pipe (in);
S = Allowable stress in pipe material (psi);
E = Joint factor - E = 1.0 for seamless pipe, E = 0.85 for ERW pipe;
C = Corrosion allowance, typically 0.05 in.;
W = Weld joint strength reduction factor per para. 302.3.5(e)
y or Y = Wall thickness coefficient in ASME B31.3 Table 304.1.1 for ferritic steels, see table below.

Wall Thickness Coefficient for Y
Materials
C° (F° )
≤ 482
(900
& Lower)
510
(950)
538
(1,000)
566
(1,050)
593
(1,100)
≥ 621
(1,150
& up)
Ferritic Steels
0.4
0.5
0.7
0.7
0.7
0.7
Austenitic steels
0.4
0.4
0.4
0.4
0.5
0.7
Other ductile metals
0.4
0.4
0.4
0.4
0.4
0.4
Cast Iron
0.0
-
-
-
-
-
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