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.

where

P = pressure
S = allowable stress
t = wall thickness
D = outside diameter

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

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

Other formulations

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.

The formula is also common in the pipeline industry to verify that pipe used for gathering, transmission, and distribution lines can safely withstand operating pressures. The design factor is multiplied by the resulting pressure which gives the maximum operating pressure (MAOP) for the pipeline. This design factor is dependent on class locations which are defined in DOT Part 192. There are four class locations corresponding to four design factors:

External links

http://www.ecfr.gov/cgi-bin/text-idx?c=ecfr&tpl=/ecfrbrowse/Title49/49cfr192_main_02.tpl

References

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