# Barlow's Formula

Barlow's formula, abbreviated as Ba, relates to burst pressure, the point just before or at when a pipe or tubing fails under pressure.

## Barlow's formulas

\(\large{ p = \frac{2 \; S \; t}{D} }\) | |

\(\large{ p = \frac{4 \; S \; t}{ D \;+\; 2 \; t } }\) | |

\(\large{ p = \frac{2 \; S \; t}{ \left(D \;-\; 2 \; t \right) \; SF } }\) | |

\(\large{ p = \frac{2 \; S \; t}{D \; SF} }\) |

### Where:

\(\large{ p }\) = pressure

\(\large{ S }\) = allowable stress

\(\large{ D }\) = outside diameter of pipe

\(\large{ t }\) = pipe thickness

\(\large{ SF }\) = safety factor (generally 1.5 - 10, 1 for bursting pressure)

### Solve for:

\(\large{ t = \frac{ p \; D }{2 \; S \; SF} }\) |

Tags: Equations for Pressure Equations for Pipe Sizing Equations for Pipe