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Old 04-27-2009, 11:00 AM
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Copper type for compressed air

Hey Guys,

I'm in the "thinking about it" stage of plumbing my garage for compressed air (I do need to get the compressor, first), and am sortof unsure as to if all copper pipe is useable as a system, or if one of the thicker-walled pipe would be better?

Last week I cleaned out my local Tractor Supply of the copper pipe that they had marked down on clearance ($2.50 for 1/2" and $4.50 for 3/4" - 10' L) cause the price was too good to pass up, but looking around I'm getting mixed signals as to its usefulness. The pipe that I've got is Type M - which is the lightest out of the commonly available types (M, L, and K, in ascending order). Question is would this still be worthwhile for a system, or would going for something a bit stronger be a better idea?

I've also read that the type of solder can make a difference as well - lead solder, lead-free, silver solder, and even brazed have all been discussed.

Thanks,
Mike

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Old 04-27-2009, 12:39 PM
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copper

I have copper in my garage have had it for 6 years no problems used the lighter stuff and just used the regular solder that they sell at lowes and sweated it I like it good price on your stuff too!!
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Old 04-27-2009, 01:05 PM
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Your pipe will be ok, your joints are the weak link. Don't uses 50-50, use 95-5 solder and you will be OK.
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Old 04-27-2009, 01:45 PM
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What kind of pressure we you thinking of running in the system?

I recently had a water collector (that came with a C/H compressor) explode on me. It was the type with the black plastic and vertical sight strip. There's not much left of it, or I would take a picture of it. Bits of plastic are embedded in the particle board it was mounted to. The type M copper that held it on for the last 17 years held solid. I have 125 lbs in my system.
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Old 04-27-2009, 09:33 PM
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Copper type for compressed air

Running 125 psi thru hose for the past 7 years, no problems.
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Old 04-28-2009, 10:58 AM
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As far as intended pressure - I was thinking that 110 or 120 would be plenty, so not much more than that, more'n'likely. We're talking about occasional use of standard air tools (impact gun, air hammer, ratchets, etc), bodywork tools (cutoff wheel, body saw) in the near future, and maybe some painting if I feel adventurous (sanders, guns, air brush) - so high-volume tools, but not necessarily [super] high-pressure.

Nice to know that the Type M will do the job, though. It would've been just my luck to have snagged this pipe, only to find out afterwards that it wasn't suitable.
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Old 04-29-2009, 08:39 AM
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Brimstone,
If you're interested in the numbers, go here:
http://www.copper.org/Applications/p...h_table3c.html

If you cruise thru the other tables, you'll find values for K and L tubing also.

Hope this helps,
Steve
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