Calculation Input

psig
inches
psi
inches
inches
---
---
psi
---
---
---

Results

Wall Thickness: inches

Pipe thickness calculation formula, t inch


General Hoop Stress Method


Where:
P = internal design pressure, psig
do= pipe outside diameter, inches.
σ = hoop stress in pipe wall, psi.

ASME B31.3 Method


Where:
tc = Corrosion allowance, inches;
tth = thread or groove depth, inches;
P = internal design pressure, psig.
do= pipe outside diameter, inches.
S = allowable stress at design temperature, psi.
E = longitudinal weld joint factor (see ANSI B31.3);
   = 1.00 for seamless;
   = 0.95 for electric fusion, double butt, straight or spiral seam weld API 5L
   = 0.85 for electric resistance weld
   = 0.60 for furnace butt-welded pipe.
Y = Coefficient, 0.4 for ferrous materials below 900 °F
Tol = pipe manufacture allowed wall thickness tolerance
      = 12.5% for API 5L pipe up to 20 inch diamter
      = 10.0% for API 5L pipe greater than 20 inch diamter

ASME B31.4 Method


Where:
P = internal design pressure, psig.
do= pipe outside diameter, inches.
E = longitudinal weld joint factor (see ANSI B31.3);
   = 1.00 for seamless;
   = 0.85 for ERW.
F = temperature factor
S = minimum yield strength of pipe, psi.

ASME B31.8 Method


Where:
P = internal design pressure, psig.
do = pipe outside diameter, inches.
S = minimum yield strength of pipe, psi.
F = design factor
E = longitudinal weld joint factor (see ANSI B31.3);
   = 1.00 for seamless, electric resistance weld, flash weld
   = 0.80 for furnace lap and electric fusion welded pipe
   = 0.60 for furnace butt-welded pipe.
T = Temperature derating factor