Pipe Wall Thickness Calculator for 6" Schedule 40 API 5L X65
Formula
t = (P × D) / (2 × S × E × Y) + Corrosion Allowance
Governing Standard
ASME B31.3, API 5L
Required Inputs
- Design pressure P (psi)
- Outside diameter D (in)
- Allowable stress S (psi)
- Joint efficiency E
- Coefficient Y
- Corrosion allowance (mm)
Output
Minimum required wall thickness (mm) and selected schedule
Notes
For API 5L X65 at 600 psi design pressure, the minimum wall thickness for 6" pipe is approximately 4.78mm. Schedule 40 (7.11mm) provides adequate margin including corrosion allowance.
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