Stainless Steel Pipe Fittings

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

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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:

Material Yield Strength 
(psi)
Ultimate Strength 
(psi)
Stainless Steel304 30,000 75,000
6 Moly, S31254 45,000 98,000
Duplex Stainless SteelS31803 65,000 90,000
Nickel Stainless Steel, N02200 15,000 55,000

  • 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)
0.028 0.035 0.049 0.065 0.095 0.12 0.134 0.148 0.165 0.18 0.203  0.22
1/4 13475 17325
5/16 10588 13475
3/8 8800 11000 16088 23375
1/2 6463 8113 11688 15950 24613
5/8 6463 9213 12513 18975 25025
3/4 5363 7563 10175 15538 20213 22963 25713
7/8 4539 6463 8663 13063 16913 19250 21450 24475
1 3988 5638 7563 11000 14575 16500 18425 20900 23100
1 1/4 6050 8968 11413 12925 14438 16225 17875 20488
1 1/2 4950 7288 9350 10588 11825 13200 14575 16775 18288
1 3/4 6188 7975 8938 10038 11275 12375 14025 15400
2 5500 6875 7838 8663 9763 10725 12100 13200
  • 1 in (inch) = 25.4 mm

Source: Zhejiang Yaang Pipe Industry Co., Limited (www.yaang.com)

Article Categories:
Steel Pipe

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