aweekes1
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| posted on 24/6/05 at 10:03 PM |
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DIY Air Tank?
Hi All,
I've got a hobby compressor (2HP, 25L) which is not too bad for most of what I do but my whizzy new die grinder makes it run out of puff very
quickly so I'm looking at external air tanks.
For safety it would want to be rated at 150psi but at this type of pressure you're looking at 75-80 Kg per square inch. I was looking at just
welding up a big box from 2mm mild steel with an angle frame and perhaps some internal bracing?
Any thoughs chaps?
Cheers,
Adam.
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Danozeman
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| posted on 24/6/05 at 10:06 PM |
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Id buy an extra tank. Theyr not alot of money.
If you made one and it blew itd make a mess.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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paulf
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| posted on 24/6/05 at 10:11 PM |
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There is no way a square pressure vessel would be safe even if reinforced.Why dont you use an old lorry air tank ,or a red propane bottle.The red
propanne gas bottles are tested to a sufficent pressure to be safe , I cant remember the exact test pressure but it is in the region of 24 bar. I have
an old propane gas tank from a transit van gas conversion for my compressor and run it at 100psi.
Paul
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Hellfire
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| posted on 24/6/05 at 10:12 PM |
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Ditto - dont attempt making one. We have loads of old propane bottles nearby... 
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Mark Allanson
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| posted on 24/6/05 at 10:21 PM |
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I made a portable air supply for my daughter's air brush using a propane bottle. I charged it with my compressor using a tyre inflator. It could
easily be used as an additional volume, but I didn't need to - 160l tank
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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aweekes1
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| posted on 24/6/05 at 10:35 PM |
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OK, square box = shed blown up (Not my shed so that wouldn't go down to well). I guess the next question is where the blazes do I get a propane
bottle or lorry tank from in SE Essex for as little money as possible???
Cheers Gents.
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Peteff
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| posted on 24/6/05 at 10:52 PM |
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I once built one using a lorry brake tank. I was warned not to use propane bottle as they were only rated at 90psi. A bigger tank isn't going to
raise your output, it will just give you more storage. You need a bigger tank and pump, meaning a bigger compressor or swap your die grinder for an
electric one. I got one from Aldi for £11.99 with a flexible shaft and a bench mount all in a plastic case. It doesn't ice up or slow down and
it uses less power than a compressor and is a lot quieter. My air grinder stays in its box now.
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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big_wasa
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| posted on 24/6/05 at 10:56 PM |
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I went down my parents 2 weeks ago to help clean the garden,We took ten of them to the locall tip who already had atleast 20 more.Have a word at your
locall tip and see if you can pick one up..You can often get big tanks on ebay used for air dryers ect and dead compressors they often fetch bugger
all due to the hassle of collection...
I had your dilema and welded the brakets on to a bigger tank,it worked for years but I never trusted it....I should have just hooked up the extra
tank........
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JonBowden
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| posted on 25/6/05 at 08:23 AM |
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Our local rubbish tip had several propane bottles the other day
Jon
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paulf
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| posted on 25/6/05 at 09:18 AM |
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The service pressure of a propane tank is in the region of 150psi and test pressre on my tank is marked as 24bar , the blue butane cylinders are rated
at a lower pressure however as butane has a much lower vapour presure.
My Compressor is a converted industrial freezer pump and not very high output , it will run a die grinder for a while as the tank provides a good
reserve and die grinder use tends to be intermittent .
I also have one of the aldi electric grinders and it is very good but not heavy enough duty for some jobs .
If using a cylinder it is best to just tee it into your existing set up , dont be tempted to weld to it.
Paul.
quote:
Originally posted by Peteff
. I was warned not to use propane bottle as they were only rated at 90psi. A bigger tank isn't going to raise your output, it will just give you
more storage. You need a bigger tank and pump, meaning a bigger compressor or swap your die grinder for an electric one. I got one from Aldi for
£11.99 with a flexible shaft and a bench mount all in a plastic case. It doesn't ice up or slow down and it uses less power than a compressor
and is a lot quieter. My air grinder stays in its box now.
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Andy W
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| posted on 25/6/05 at 09:47 AM |
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Just look for the gypsy camp, they allways leave propane cylinders everywhere.
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Peteff
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| posted on 25/6/05 at 11:41 AM |
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I was warned not to use propane bottle as they were only rated at 90psi
This was the guy at the scrapyard where they use the cylinders for burning. He gave me the lorry tank so he wasn't after my money . I have a
3hp 50ltr sip now but that still runs a lot if you use the die grinder. If you increase your storage massively with the same pump you will be
frustrated waiting for it to get up to pressure, running two compressors into the tank would be another option.
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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aweekes1
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| posted on 25/6/05 at 05:40 PM |
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Thank's for the suggestions chaps. I'll see if I can locate an orange tank somewhere. Unfortunately our local tip was long ago replaced
with a recycling centre but I'll give them a go. I know I really need to up the CFM for big boys air tools but I can afford to be more patient
but can't afford to buy another compressor!
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britishtrident
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| posted on 25/6/05 at 08:02 PM |
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Running 2 compressors works well
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owelly
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| posted on 27/6/05 at 09:27 PM |
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I've had old gas cylinders up to 300psi and I'm still here!!!!
http://www.ppcmag.co.uk
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The Shootist
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 posted on 28/6/05 at 03:23 AM |
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Keep your eyes open...
Lots of things will work as an air tank.
Old water heater(Non-leaking)
A section of pipe.
A coil of tubing or hose.
Gas bottles 1 or multiples.
Portable tire inflation tank
Like I said lots of things will work, just keep your eyes open to possibilities.
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40inches
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| posted on 28/6/05 at 10:21 AM |
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quote:
Originally posted by britishtrident
Running 2 compressors works well
B&Q warehouse have a 1.5hp/6cfm compressor with a 6litre tank for £49
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Dale
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| posted on 28/6/05 at 09:20 PM |
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I am using a propane fuel tank from a truck as my compressor tank- a freebe from the recyclers. I also use a 30lb propane tank as an airpig for
portable use.
Dale
Thanks
Dale
my 14 and11 year old boys 22
and 19 now want to drive but have to be 25 before insurance will allow. Finally on the road
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NS Dev
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| posted on 4/7/05 at 03:17 PM |
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local tips or "recycling centres" still have loads of them, plus plenty of C02 bottles which are useful too!!
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JoelP
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| posted on 4/7/05 at 06:24 PM |
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quote:
Originally posted by 40inches
B&Q warehouse have a 1.5hp/6cfm compressor with a 6litre tank for £49
thats pretty good - i was looking at it the other day but couldnt stop laughing at how small the tank looked! but as a second pump, it might be
useful.
I really want to get a silent compressor, but the machine mart catalogue is well expensive (but 40dB is VERY quiet).
I look on ebay now and again for air recievers, but never found one near enough. 
Just now, i was blowing up my car tyres, trying to do it without turning the pump on. I ran out of pressure on the third, hence i too would like to
rig up a bigger tank.
edit : searching for 'receiver' would be a little better than 'reciever'!
2nd edit : theres a big one in essex quite cheap on ebay
[Edited on 4/7/05 by JoelP]
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suparuss
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| posted on 15/7/05 at 06:19 PM |
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just thought id dig this up again to ask soldered copper pipe will take 150psi?
just thinking of hard plumbing my compressor to the garage as it will be moving out to a seperate shed to make more room in the garage so i was
thinking i could use 22mm copper pipe so it aslo expands the capacity as well!
any thoughts??
Cheers,
Russ.
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rusty nuts
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| posted on 15/7/05 at 06:33 PM |
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Suspect soldered joints may be a bit dodgy but no doubt someone may know for sure but have you thought about usin the correct type of pipe with
threaded connections . not to expensive and a correct size die would be cheap to hire . It's also possible to use flexible air pipe which is
even easier to use than copper . Check your local garage equipment suppliers
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JoelP
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| posted on 15/7/05 at 06:35 PM |
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pressure table, no guarantee of accuracy!
http://www.liangchew.com/prod01.htm
62 BAR for the tube itself! 
[Edited on 15/7/05 by JoelP]
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omega 24 v6
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| posted on 15/7/05 at 07:24 PM |
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You could use transport refrigeration seamless copper piping it has a thicker sidewall and silver solder the joints. Don't know what the max
pressure is but it's quite high as they pressure test them from a nitrogen cyl using a regulator. I could find out for you on monday if you need
more info u2u me.
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suparuss
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| posted on 15/7/05 at 08:32 PM |
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cheers for that people! looks like itll be ok from that link, guess i can just go ahead and try it, if the joints fail i gues i could just braze them
properly as it looks like the tube is well up to the job.
Cheers again.
Russ.
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