Bursting Pressure
Barlows Formula and bursting pressure of pipes and tubes
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Barlow's formula can be used to estimate burst pressure of pipes or tubes.
P = 2 s t / [(do - 2 t) SF] (1)
where
P = max. working pressure (psig)
s = material strength (psi)
t = wall thickness (in)
do = outside diameter (in)
SF = safety factor (in general 1.5 to 10)
The Barlow's estimate is based on ideal conditions at room temperature.
Material Strength
The strength of a material is determined by the tension test, which measure the tension force and the deformation of the test specimen.
- the stress which gives a permanent deformation of 0.2% is called the yield strength
- the stress which gives rupture is called the ultimate strength
Strength of some common materials:
| Material | Yield Strength (psi) | Ultimate Strength (psi) |
| Stainless Steel, 304 | 30,000 | 75,000 |
| 6 Moly, S31254 | 45,000 | 98,000 |
| Duplex, S31803 | 65,000 | 90,000 |
| Nickel, N02200 | 15,000 | 55,000 |
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