Tuesday, January 4, 2022

Estimate Burst Pressure Of Steel Pipes Or Tubes by wilsonpipeline.com

Barlow’s formula can be used to estimate burst pressure of steel pipes or tubes.

P = 2 s t / (do SF)

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 tensile strength 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

steel pipes Strength of some common materials:

MaterialYield Strength 
(psi)
Ultimate Strength 
(psi)
Stainless Steel, 30430,00075,000
6 Moly, S3125445,00098,000
Duplex Stainless Steel, S3180365,00090,000
Nickel Stainless Steel, N0220015,00055,000
  • 1 psi (lb/in2) = 6,894.8 Pa (N/m2) = 6.895×10-2 bar

steel pipes Bursting Pressure

Bursting pressure of low carbon steel pipes are indicated in the table below:

OD (in)Bursting Pressure (psi)
Wall Thickness (in)
0.0280.0350.0490.0650.0950.120.1340.1480.1650.180.203 0.22
1/41347517325
5/161058813475
3/88800110001608823375
1/264638113116881595024613
5/864639213125131897525025
3/4536375631017515538202132296325713
7/84539646386631306316913192502145024475
1398856387563110001457516500184252090023100
1 1/460508968114131292514438162251787520488
1 1/2495072889350105881182513200145751677518288
1 3/46188797589381003811275123751402515400
255006875783886639763107251210013200
  • 1 in (inch) = 25.4 mm

Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

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