• API Internal Yield - Burst Strength
       
Input Field(s)      
Minimum Yield Strength (Yp) psi
Nominal Wall Thickness (t) in
Nominal OD (D) in
       
Output Field(s)      
Minimum Internal Yield Pressure psi

  • Calculation Guide
  • Overview - Barlow Equation (API)
    • The Burst Strength of the pipe body is determined by the Internal Yield Pressure Formula (API Bulletin 5C3 1985). This is used to calculate the internal pressure at which the tangential stress (hoop stress) reaches the yield strength of the material
  • Equation
    • p = 0.875 (2 Yp t/D)
    • ---------------------------------------
    • p - Minimum Internal Yield Pressure (psi)
    • Yp - Minimum Yield Strength (psi)
    • t - nominal wall thickness (in)
    • D - nominal OD of pipe (in)
  • Assumptions
    • No applied forces, external pressure
    • Thin Wall Assumption (D/t >>1)
    • Allowable manufacturing tolerance 12.5%
  • Reference
    • API Bulletin 5C3 (1985)
    • Petroleum Well Construction; Economides, Watters, Dunn-Norman
  • Unit Conversion Tool