caber
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| posted on 9/10/06 at 11:24 PM |
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air tanks
Aanyone know of a cheap source of air tanks to increase the capacity of my compressor? in the USA you can buy tanks off the shelf for compressed air
storage I haven't seen any here.
Caber
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Peteff
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| posted on 9/10/06 at 11:32 PM |
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Lorry brake tanks.
Scrapyards that break commercial vehicles will have them.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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zetec7
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| posted on 10/10/06 at 04:36 AM |
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I made a "pony tank" (euphimistically known also as an "air pig" around these parts) out of a couple of discarded 20 lb.
barbeque propane tanks. Joined them together using a manifold of pipe (threaded on the ends) with an air-tool type quick-connect and a cheap guage in
the middle. Works a treat - holds enough air to completely inflate 4-6 large, flat tires. Or, to run an air-impact wrench long enough to remove and
replace 4 large truck wheels. I flushed out the tanks with hot water and soap first (until the smell was gone). Although fuel gas fittings are
usually left-hand thread, the thread going into these tanks (after you unscrew the valve) is normal, right-hand thread. VERY cheap, Locost way of
doing it!
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Bluemoon
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| posted on 10/10/06 at 08:57 AM |
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Not sure about propane tanks, I don't think they are rated to high enough preasure (at least not in the uk)?
Cheers,
Dan
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NS Dev
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| posted on 10/10/06 at 09:16 AM |
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they are surely? Can't remeber what it says on the bottles I have but I am sure its over 250 psi.
Anyway, unless you can find some old bottles that have been open for ages I would rather go for a helium bottle or similar.
Go to your local tip and ask what they have, ours have loads of different bottles that they will give away.
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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Bluemoon
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| posted on 10/10/06 at 10:58 AM |
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Must be thinking of butane... Like you say so long as it's rated to the correct preasure, should be fine, but I would also agree that a bottle
that has had inert gas in it would be a safe option if it's in good condition (no idea how you know that mind!!).
I think the standard tests use water to preasure test the bottles above there nonminal rated preasure. Not somthing you can do at home.
I would be cautious with a scrap bottle, after all why was the bottle scrapped?
You can get external tanks in the UK that are preasure tested, not locost though...
Dan
[Edited on 10/10/06 by Bluemoon]
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NS Dev
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| posted on 10/10/06 at 11:33 AM |
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The bottles at the tip are just stuff people have found in sheds, on gippo sites or in the corner or their workshop.
If you are worried about the pressure thing then get a big high pressure gas bottle, again from the tip, like an old oxygen or nitrogen bottle. These
aill stand at least 20 times the pressure you need them to!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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Peteff
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| posted on 10/10/06 at 11:52 AM |
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Older oxygen type bottles which are obsolete were filled to 200bar (about 3000psi) whereas the new ones are 300bar. Propane bottles (the ones I have)
are tested to 34.9bar in case they get heated but are only rated at about 90psi for continuous use as they are designed to contain liquid gas not
pressurised according to my caravan bottle supplier.
[Edited on 10/10/06 by Peteff]
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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MikeRJ
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| posted on 10/10/06 at 12:41 PM |
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quote:
Originally posted by Peteffare only rated at about 90psi for continuous use as they are designed to contain liquid gas not pressurised
The gas has to be under pressure to remain a liquid!
http://wolfstone.halloweenhost.com/HalloweenTech/pnupro_PropaneAirTank.html suggests that propanes vapour pressure is already 124PSI at 70F (21C),
which is not too far off the working pressure of most compressors. The safety factor on these bottles must be pretty large as they are freely
available to people who don't know what they are doing.
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scottc
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| posted on 10/10/06 at 03:22 PM |
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What about an old non-working compressor? Assuming the reason it doesn't work isn't that the tank leaks 
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Confused but excited.
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| posted on 10/10/06 at 05:33 PM |
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Have a look on ebay.
A 222 litre one ( roughly 6ft high by 2ft wide) just went for £77.
Tell them about the bent treacle edges!
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Peteff
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| posted on 10/10/06 at 08:04 PM |
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The gas has to be under pressure to remain a liquid!
I listened to my gas supplier. I trust him more than the internet when it comes to gas cylinders. My compressor runs to 150psi and is a basic sip one.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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