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Need a burst pressure calculation

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Need a burst pressure calculation

Unread postAuthor: Fnord » Sat Jun 30, 2007 10:35 am

I remember someone a while back saying they had the formula for calculating the burst pressure of pipe when given specific dimentions.

I can't seem to find the formula or remember who said it, so I need someone to post it here if possible.
If someone knows it and doesn't mind crunching some numbers, here are the pipe stats:

Metal: black iron(need a calc for steel too)
Welded seam
Inside Diameter: 2.08"
Wall thickness .166"
Thread depth: between .06 and .08
Lenght: 8.5"

Thanks.
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Unread postAuthor: RDX, » Sat Jun 30, 2007 11:12 am

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Unread postAuthor: SpudBlaster15 » Sat Jun 30, 2007 1:59 pm

I was the one who posted the formula, which is,

FS*(2*WT)/ID

Where,

FS = Fatigue strength of the material (psi)
WT = Wall thickness of the pipe (inches)
ID = Inside diameter of the pipe (inches)

The steel used to construct plumbing parts is fairly low grade, and fatigues at approximately 15,000psi. There is essentially no difference between black iron and galvanized steel, aside from the surface coating. So,

15,000*(2*.166)/2.08 = 2,394psi
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Unread postAuthor: Fnord » Sat Jun 30, 2007 6:04 pm

Thanks.

So what I see is, cut that # in half for the threads, and take about 2/3 that for safe working pressure. So about 792 or 54 bar.

Didn't I see a graph a while back showing DDT peaked at about 50 bar?

Edit: found it. Also posted by you :)

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Unread postAuthor: SpudBlaster15 » Sat Jun 30, 2007 8:55 pm

Keep in mind that this pressure was recorded using a fuel/air mixture at atmospheric pressure.

The pressure spike created by DDT is not the greatest concern, rather, the extreme rapidity of the pressure rise is. It can cause materials that would otherwise withstand the pressure level to fail due to shock loading.
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Unread postAuthor: AdamD » Wed Nov 11, 2009 3:58 am

Hi,
The formula is available at http://www.engineering-alloys.com, along with other useful tools and information
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