Barlow's Formula Calculator

Barlow's Formula is Used to Determine:
  • Internal Pressure at Minimum Yield
• Ultimate Bursting Pressure
• Maximum Allowable Operating Pressure
• Mill Hydrostatic Test Pressure
  The Formula is Expressed as P=2St/D, Where:
    P = pressure, psig
t = nominal wall thickness, in inches (i.e. .375)
D = outside Diameter in inches
S = allowable stress in psi, which depends on the pressure being determined utilizing Yield or Tensile depending on what is trying to be determined
  For Example:
  Internal Pressure at Minimum Yield:
S= SMYS - minimum yield for grade of pipe
  Ultimate Bursting Pressure:
  S = SMTS - minimum tensile strength for grade of pipe
  Maximum Allowable Operating Pressure:
  S = SMYS - reduced by a design factor
  Mill Hydrostatic Test Pressure:
  S = SMYS - reduced by a design factor depending on OD and grade
  Enter any three numaric values:
  P = Pressure   psig
  t = Nominal Wall Thickness   in.
  D = Outside Diameter   in
  S = Allowable Stress   psi



Texas Pipe Facts

Founded in 1918
Headquartered in Houston, TX
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