Thickness Calculator
X42=42,000 psi · X52=52,000 psi · X60=60,000 psi · X65=65,000 psi
0.72 Class 1 · 0.60 Class 2 · 0.50 Class 3
1.0 for seamless or fully radiographed welds
1.0 for temperatures ≤ 250°F (121°C)
About ASME B31.4
ASME B31.4 covers pipeline transportation systems for liquid hydrocarbons and other liquids between production fields, terminals, refineries, and other delivery points.
Formula Used
t = (P × D) / (2 × S × F × E × T)
Variables
- t — Minimum wall thickness
- P — Internal design pressure
- D — Outside diameter
- S — SMYS (Specified Minimum Yield Strength)
- F — Design factor (location class)
- E — Weld 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
More to Explore
Tools & Resources
PED Category Quick Check Calculator
Interactive tool to determine PED 2014/68/EU category and conformity assessment requirements.
Read More
Tools & Resources
ASME B31.3 Piping Thickness Calculator
Calculate minimum wall thickness for process piping according to ASME B31.3 standard.
Read More
Tools & Resources
ASME B31.8 Gas Pipeline Thickness Calculator
Calculate minimum wall thickness for gas transmission and distribution piping systems.
Read More