Texas Pipe and Supply

Leading Distributor of Carbon and Stainless Steel Pipe Since 1918.

Pipe Chart

Click here to download a PDF of the Texas Pipe & Supply Pipe Chart

Barlow's Formula Calculator

Enter any three numeric values:

psig
in.
in.
psi

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

Pipe Weight Per Foot Calculator

This formula can be used to determine the weight per foot for any size of pipe with any wall thickness.

Formula: Wt/Ft = 10.69* x Wall Thickness

Enter Diameter & Thickness:

inches
inches