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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: exhaust manifold pressures
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Thu, 25 August 2005 07:32
 
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| ke382TG wrote on Thu, 25 August 2005 16:40 |
A plastic 375ml coke bottle is capable of holding approximately 300psi before catastrophic failure, so I assume a well constructed tig welded steam pipe manifold would cope easily with 3 bar of pressure until the metal reached a temperature point where it became plastic?????
I am rambling now, someone with knowledge (a metalurgist) enlighten us 
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well.. just had a quick look for conditions of steam secondary superheater headers.... although the vessels are much much thicker than what is used for cars, the pressure and temps are around 550C, and 2400-3800Psi...
http://www.babcock.com/pgg/tt/pdf/BR-1586.pdf
this means that the little pipes off it have to be rated for thhat pressure too..
and a neat little flash
http://www.aes.hu/ENG/Movie5.swf
which also states 2500psi
so i guess it depends on what "steam pipe" is actually being used... when you talk about operating temps and pressures of pipes.. you are talking YEARS to failure..
i think what is more important for a turbo header is the weight of the turbo itself, and the vibration it generates..
with the turbo hanging of, you have a certain load which for some part of the header is tension, but the vibration now makes this a cyclic tensile load, which is perfect for fatigue..
that said tho, don't most turbo headers fail by crackign at welds/joins rather than the pipe itself?? oh, and occasionl overtemp is important too... 800deg is pretty high, and that temp combined with loading, even for a short time can cause damage (if design/material is not adequate).
fwiw, turbine blades run at around 1000C, but they fail from creep and oxidation, and we are talking about 20-30,000hrs AT temperature...
Cya, Stewart
[Updated on: Thu, 25 August 2005 07:32]
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| | Subject | Poster | Date |
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exhaust manifold pressures
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GUN METAL 87 SC | Fri, 19 August 2005 11:43 |
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Re: exhaust manifold pressures
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berad | Sat, 20 August 2005 00:01 |
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Re: exhaust manifold pressures
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GUN METAL 87 SC | Wed, 24 August 2005 10:19 |
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Re: exhaust manifold pressures
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YelloRolla | Wed, 24 August 2005 10:31 |
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Re: exhaust manifold pressures
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GUN METAL 87 SC | Wed, 24 August 2005 10:35 |
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Re: exhaust manifold pressures
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oldcorollas | Wed, 24 August 2005 11:25 |
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Re: exhaust manifold pressures
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oldcorollas | Wed, 24 August 2005 11:45 |
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Re: exhaust manifold pressures
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YelloRolla | Wed, 24 August 2005 22:06 |
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Re: exhaust manifold pressures
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YelloRolla | Wed, 24 August 2005 22:07 |
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Re: exhaust manifold pressures
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oldcorollas | Thu, 25 August 2005 06:09 |
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Re: exhaust manifold pressures
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YelloRolla | Thu, 25 August 2005 06:16 |
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Re: exhaust manifold pressures
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ke382TG | Thu, 25 August 2005 06:40 |
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Re: exhaust manifold pressures
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YelloRolla | Thu, 25 August 2005 06:45 |
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Re: exhaust manifold pressures
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oldcorollas | Thu, 25 August 2005 07:32 |
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Re: exhaust manifold pressures
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oldcorollas | Thu, 25 August 2005 07:36 |
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Re: exhaust manifold pressures
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ke382TG | Thu, 25 August 2005 06:55 |
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Re: exhaust manifold pressures
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YelloRolla | Thu, 25 August 2005 07:00 |
