ryan81
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High Pressure Steal Reaction Vessel Wanted
Is there a steal autoclave out there which can withstand very high pressure, at 450 C that one can part with?
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Steam
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Have you tried ebay? Generally you can find a fairly good deal on such items with a bit of sleuthing...
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ryan81
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Yes sir. I have,
But I am still ambivalent they can reach the pressure and temp. I am looking for. It would be great to have a solid recommendation.
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careysub
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What is "very high pressure" to you?
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ryan81
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65-150 MPA...not to high, but thats it
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ryan81
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but yea, thats some pressure
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ryan81
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60 MPA will work just fine though
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ryan81
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looking for the holy grail of autoclaves without spending more than $9500
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Oscilllator
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I think the closest thing you're going to get is a steel diving cylinder (not aluminium obviously). Looking at the wiki page it seems you can get
300bar/30MPa cylinders. I suspect the cylinders will be significantly weakened at those kinds of temperatures though.
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Fulmen
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Bhoy, that's a decent bomb if I ever saw one. I could probably design it, but it's not trivial work and you'd still need someone skilled to make it. I
would strongly recommend a pressure vessel steel like A285, these are intended for temperatures up to 4-500°C.
Oscillator: Without knowing the actual steel used in a tank I would be very uncomfortable with elevated temperatures.
[Edited on 5-8-15 by Fulmen]
We're not banging rocks together here. We know how to put a man back together.
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Dr.Bob
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I would never use a vessel not designed for chemicals at those temps and pressures. That would be not only dangerous for yourself but also any
neighbors. But steel pressure reactors do go on sale, and most have a model number which can be used to verify the pressures and temps that they are
rated for. I have used several of them, and they are a pain to use, but work OK. But they should be used in a hood or similar space with a blast
shield, in case the over-pressure vent gives way. I have only seen small glass pressure tubes fail, inside a shielded reactor, that was quite a
spectacular amount of noise, but if a steel one does, it becomes a serious danger.
Parr Instruments makes many of those, so perhaps check there website for which models might work. Then check Ebay and other science auctions, there
are plenty of labs closing in the US.
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careysub
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Ah, the glories of an earlier age - where individual ingenuity would devise makeshift solutions fearlessly! The glorious age of boiler explosions!
In reviewing the list you will note there are not many of these in recent decades, and most of the ones that have occurred recently were explosions of
old equipment. There are 20 listed boiler explosions with double digit fatalities but the last one was in 1918.
IMHO: if you can't afford proper equipment for this you shouldn't be doing it.
Here is an old reference book charting the decline in annual boiler explosion deaths in Great Britiain from 1859 to 1893! It is quite impressive. Presumably in nearly every case of a fatal
boiler explosion, the people operating the boiler probably thought they knew what they were doing.
[Edited on 5-8-2015 by careysub]
[Edited on 5-8-2015 by careysub]
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annaandherdad
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Here's a video of a guy who has made supercritical CO2. He is a lot more competent that I am, but even so I'd be nervous about being around this
thing.
https://www.youtube.com/watch?v=-gCTKteN5Y4
Any other SF Bay chemists?
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unionised
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A 1 litre vessel at 100MPa stores 100 KJ or so of energy.
That's about half a pound of TNT equivalent.
How big a vessel do you want?
If it's less that a centimetre on each side it might be realistic.
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careysub
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Quote: Originally posted by unionised  | A 1 litre vessel at 100MPa stores 100 KJ or so of energy.
That's about half a pound of TNT equivalent.
How big a vessel do you want?
If it's less that a centimetre on each side it might be realistic. |
No, its about 25 g of TNT equivalent - but, hey, that's a lot!
This frag grenade:
https://en.wikipedia.org/wiki/V40_Mini-Grenade
contains 136 g of composition and is dangerous up to 300 M!
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Fulmen
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Haven't done the math myself, but I do not doubt that the stored energy would be substantial. Personally I find the pucker factor of a 60MPa vessel to
be way beyond my comfort zone, but to each his own.
As for the design I would have to do some digging for relevant standards, but the math itself isn't hard. A heavy walled pipe with welded flanges and
bolted end caps would be my choice as it is simple and easy to modify. This design would also allow the bolts to act as a burst safety limiting the
main danger to two directions.
It looks like ASME requires a safety valve at 1.1 MAWP, a 1.5 yield and a 3.5 ultimate tensile safety factor for pressure vessels.
[Edited on 5-8-15 by Fulmen]
We're not banging rocks together here. We know how to put a man back together.
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