Thickness Calculator
X42=42,000 psi · X52=52,000 psi · X60=60,000 psi · X70=70,000 psi
0.72 Class 1 · 0.60 Class 2 · 0.50 Class 3 · 0.40 Class 4
1.0 for seamless, ERW, or SAW pipe
1.0 for temperatures ≤ 250°F (121°C)
About ASME B31.8
ASME B31.8 covers gas transmission and distribution piping systems, including gas pipelines, compressor stations, metering stations, and other facilities.
Formula Used
t = (P × D) / (2 × S × F × E × T)
Variables
- t — Minimum wall thickness
- P — Maximum operating pressure
- D — Outside diameter
- S — SMYS (Specified Minimum Yield Strength)
- F — Design factor (location class)
- E — Longitudinal joint factor
- T — Temperature derating factor
Important Notes
- Design factor varies by location class (population density)
- Ensure consistent units throughout calculation
- Additional thickness for corrosion and mill tolerance required
- Minimum practical wall thickness considerations apply
- Always verify with a qualified engineer
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