Barlow's formula

Barlow's formula relates the internal pressure that a pipe[1] can withstand to its dimensions and the strength of its material.

P=\frac {2St} {D}

where

P = pressure (typically, pounds per square inch)
S = allowable stress (typically, pounds per square inch, yield or tensile depending upon application)
t = wall thickness (typically, inches)
D = outside diameter (typically, inches)

This formula figures prominently in the design of autoclaves and other pressure vessels.

The formula is named after Peter Barlow, an English mathematician.

The design of a complex pressure containment system involves much more than the application of Barlow's formula. For almost all pressure vessels, the ASME code stipulates the requirements for design and testing.

External links

Notes

  1. ^ Or pressure vessel, or other cylindrical pressure containment structure.