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Another Fridgy Related Thread

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Another Fridgy Related Thread

Unread postAuthor: thedeathofall » Wed May 12, 2010 4:09 pm

I happen to have seen a lot of threads about compressors lately... maybe that's just me...

Anyway, I was wondering how many people built/bought resevoir tanks for their fridge compressor, and what they built them out of. I might have the option of getting ahold of a compressor from a large freezer (like big enough for two bodies), and wanted to have a [high] pressure tank for it. What would you guys recomend?

I was thinking about mulitple 2 inch galv. pipe nipples all connected, but It may not be enough of a resevoir, and too expensive to be worth it. Plus can they even handle 500-600 psi?

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Unread postAuthor: Gun Freak » Wed May 12, 2010 4:39 pm

Galvanized can definately handle that. But it would be very costly to make it out of just nipples and fittings. What about a small compressor tank?
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Unread postAuthor: mark.f » Wed May 12, 2010 4:56 pm

Gun Freak, those tanks are usually rated to ~125 PSI. Not very good if you want to harness the high pressure of a refrigerator compressor.
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Unread postAuthor: POLAND_SPUD » Wed May 12, 2010 5:13 pm

I got lucky becasue I already had a 30 feet long steel pipe... but AFAIK pipes are relatively cheap...

though it would be better to get an old scuba tank... or just any HPA tank... preferably one that's made of material that won't rust... so either aluminium or carbon fibre
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Unread postAuthor: Gun Freak » Wed May 12, 2010 6:32 pm

I thought they were rated to much higher... my compressor has one (much bigger) and it cand do 150 psi, so I'm fairly sure they wouldn't put a relatively low pressure rated tank on it.
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Unread postAuthor: c11man » Wed May 12, 2010 6:36 pm

@gun freak, normal air compressor tanks are rated in the 125 to 150psi range. size has nothing to do with it because if its smaller they make them thinnner and if larger make the metal thicker to keep cost down and the rating high enough. so those thanks would not work for a fridgy if you want to store above 150psi
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Unread postAuthor: Gun Freak » Wed May 12, 2010 7:05 pm

Ok, forget I ever said that :shock:
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Unread postAuthor: theBOOM » Wed May 12, 2010 9:35 pm

If there is a firestation near you or something similar you might be able to get large fire extinguishers. My dad has a big one probably 3 or 4 gallon fire extinguisher and I'm sure they can hold about 300 psi, not too much but still would give enough air for ALOT of shots.
I actually got ahold of one of these fridge compressores, bought the fittings and the hydrauilic hose, I'm just missing the pressure gauge.

Look for high pressure tanks on ebay, I recently found an auction which sells USED medical air tanks for 18 bucks, they're 26 inches long and 4 inches in diameter, rated to 2150 psi. Pretty good deal if you ask me, you can buy 1 or 2 and pressurize them to 600 psi each. Just look around.
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Unread postAuthor: thedeathofall » Thu May 13, 2010 12:20 am

Alright. I might give ebay a shot. I have had poor luck finding stuff there recently. Does anyone else have first hand experience with this situation? Is there anything else I should think about?

EDIT****

So I decided I might try SCBA tanks, either through ebay or I might try at my local fire station. My question, was how can I cahnge threads? I believe the have CGA 347 threads on them, but I would need NPT fittings. I tried McMaster, but I am not sure if item #79215A656 is appropriate for my needs. Does anyone have experience with these? Or should I just look for something else?
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