Just a quick question, but I believe I'm doing something wrong here.
Using Barlow's formula, I ended up with a burst pressure of ~4300psig for a 4" Schedule XXS pipe made of plumbing grade steel. As far as I know, that's closer to the rated pressure of 4" Schedule XXS than to the burst pressure.
Can someone else who knows what they're doing try this and see what answer they come up with?
Barlow's formula
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clide
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I don't really see much that could go wrong with that equation. What value did you use for material strength? In order to get ~4300 psi bursting pressure for 4" XXS I need to use a material strength of around 10000 psi, which is pretty darn low for steel.
Last edited by clide on Fri Apr 25, 2008 7:26 pm, edited 1 time in total.
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X=PD/2y
where
X = laminate wall thickness required (in)
P = operating pressure (psi)
D = inside diameter of pipe (in)
γ = design stress (psi)
Is this the one you used?
where
X = laminate wall thickness required (in)
P = operating pressure (psi)
D = inside diameter of pipe (in)
γ = design stress (psi)
Is this the one you used?
If i'm not wrong a 100mm OD (4") pipe with 5mm (0,2") thick walls made of S355JR with tensile strength of 600N/mm2 (87000psi) will have a burst pressure of 600bar (8700psi)
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I'm not coming up with any of the above answers .
using online calculator at
http://www.engineersedge.com/calculator ... t_calc.htm
Engineers Edge Design & Engineering Resources
OD (in) 4.50 (in)
Wall (in) .674 (in)
Material Strength 35000 (psi)
Safety Factor (working) 2 See Above
Calculated Working Pressure 7500
Calculated Bursting/Yield Pressure 15000
that was far enough of everyone else's numbers I looked up pipe charts to see what the #*&@.
using published charts at
http://www.engineeringtoolbox.com/steel ... -d_43.html
answer is about the same
Double Extra Strong Wrought Steel Pipes - XXS
Pipe Dimension
(inches) Double Extra Strong - XXS
Bursting Pressure
(psi) Working Pressure
(psi)
1/2 28000 3500
3/4 23460 2930
1 21780 2720
1 1/4 18400 2300
1 1/2 16840 2110
2 14680 1840
2 1/2 15355 1920
3 13710 1710
3 1/2 15900 1990
4 14965 1870
5 13475 1690
I may be ignorant of what thickness you have .
the closest sch to X.X.strong pipe is sch.160, but not same.
using online calculator at
http://www.engineersedge.com/calculator ... t_calc.htm
Engineers Edge Design & Engineering Resources
OD (in) 4.50 (in)
Wall (in) .674 (in)
Material Strength 35000 (psi)
Safety Factor (working) 2 See Above
Calculated Working Pressure 7500
Calculated Bursting/Yield Pressure 15000
that was far enough of everyone else's numbers I looked up pipe charts to see what the #*&@.
using published charts at
http://www.engineeringtoolbox.com/steel ... -d_43.html
answer is about the same
Double Extra Strong Wrought Steel Pipes - XXS
Pipe Dimension
(inches) Double Extra Strong - XXS
Bursting Pressure
(psi) Working Pressure
(psi)
1/2 28000 3500
3/4 23460 2930
1 21780 2720
1 1/4 18400 2300
1 1/2 16840 2110
2 14680 1840
2 1/2 15355 1920
3 13710 1710
3 1/2 15900 1990
4 14965 1870
5 13475 1690
I may be ignorant of what thickness you have .
the closest sch to X.X.strong pipe is sch.160, but not same.