Thickness Calculator
1.0 for seamless pipe, 0.85–1.0 for welded pipe depending on examination
About ASME B31.3
ASME B31.3 is the Process Piping code covering piping in petroleum refineries, chemical plants, pharmaceutical plants, textile mills, and related processing facilities.
Formula Used
t = (P × D) / (2 × (S × E + P × Y))
Variables
- t — Minimum required thickness
- P — Internal design pressure
- D — Outside diameter
- S — Allowable stress
- E — Weld joint efficiency
- Y — Temperature coefficient (0.4)
- c — Corrosion allowance
Important Notes
- For straight pipe under internal pressure only
- Ensure consistent units throughout calculation
- Allowable stress values from ASME B31.3 Appendix A
- Additional thickness may be required for mechanical strength
- Always verify with a qualified engineer
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