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:

Material	Yield Strength  (psi)	Ultimate Strength  (psi)
Stainless Steel, 304	30,000	75,000
6 Moly, S31254	45,000	98,000
Duplex Stainless Steel, S31803	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: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

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