### 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
- d
_{o}= pipe outside diameter, inches. - σ = hoop stress in pipe wall, psi.

ASME B31.3 Method

- Where:
- t
_{c}= Corrosion allowance, inches; - t
_{th}= thread or groove depth, inches; - P = internal design pressure, psig.
- d
_{o}= 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.
- d
_{o}= 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.
- d
_{o}= 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