# Texas Pipe and Supply

Leading Distributor of Carbon and Stainless Steel Pipe Since 1918.

# 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

Texas Pipe & Supply is part of the Texas Pipe Family of Companies