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  #31 (permalink)  
Old 03-01-2011, 05:39 PM
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air lines

Can you find the brown sealant anywhere? In my neck of the woods I don't think I've ever seen it anywhere. All I've ever seen is the white stuff. As far as black pipe goes I don't have a pipe threader. I really don't want to buy one to only use it one time because I probably won't use it again. Thanks for the help.

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  #32 (permalink)  
Old 03-01-2011, 06:19 PM
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air lines

Quote:
Originally Posted by Chevelle427Rat
Can you find the brown sealant anywhere? In my neck of the woods I don't think I've ever seen it anywhere. All I've ever seen is the white stuff. As far as black pipe goes I don't have a pipe threader. I really don't want to buy one to only use it one time because I probably won't use it again. Thanks for the help.
Measure each section that you will need, when you pickup your pipe they will cut and thread for you. Then you can take it home and put the puzzle together. easy.

Bob

You have to forgive oldred as he is old.LOL
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  #33 (permalink)  
Old 03-01-2011, 07:00 PM
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Quote:
Originally Posted by 35terraplane
You have to forgive oldred as he is old.LOL

Yep BUT consider the alternative to getting old!
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Old 03-04-2011, 10:02 PM
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air line

I'm going with copper. Yes there have been "issues" in terms of copper in domestic water systems (DWS), including right here in my house, where the acidity of the water (I'm on a well) ate the pipes alive. About a year ago I replaced every single inch of copper line in my house with IPEX and put a water ph balance system in line where the line enters the house. My buddy about a block or so away used black iron in his air system and keeps getting rusty colored stuff out of his water traps, so now he is re-doing with copper.

Just my experience - your results may vary
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  #35 (permalink)  
Old 03-04-2011, 10:13 PM
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Thanks for the info. I went with 3/4inch copper pipe. Where I'm at the black itself was the only thing that was cheaper. The fittings in both metals were the same price. Plus its easier to work with. If I mess it up its easier to fix.
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Old 03-05-2011, 03:49 AM
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You will never regret using the Copper, it is IMHO, the best choice for several reasons but black iron would have been a good choice also.

As far as the "rusty colored stuff out of the water traps" when using Black iron that is not unusual nor surprising and is probably the reason many fear the iron pipe causing rust flakes in the air stream, this is caused by water standing in the traps causing the rust. There are probably more Black iron piping systems in use than anything else and some of these have been around for a great many years without rust in the air being a problem, people warn about it all the time but I have yet to see it actually be a problem in a properly installed system. Of course using Copper will remove all doubt and the Copper has other advantages also, especially in a short run system, but for those who choose to use Black iron they can do so with the confidence that it is a well proven an accepted choice and will work just fine.
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  #37 (permalink)  
Old 03-05-2011, 06:30 AM
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air lines

My total run with drop is around 40ft. I went with 3/4inch cause I'm not trusting my 6.5 hp oilless "crapsman" compressor. It was a gift. When it goes I'm buying a quincy two stage 80 gallon. By the way which quincy upright is a good choice? Thanks for the help.
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  #38 (permalink)  
Old 03-05-2011, 07:23 AM
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Quote:
Originally Posted by oldred
You will never regret using the Copper, it is IMHO, the best choice for several reasons but black iron would have been a good choice also.

As far as the "rusty colored stuff out of the water traps" when using Black iron that is not unusual nor surprising and is probably the reason many fear the iron pipe causing rust flakes in the air stream, this is caused by water standing in the traps causing the rust. There are probably more Black iron piping systems in use than anything else and some of these have been around for a great many years without rust in the air being a problem, people warn about it all the time but I have yet to see it actually be a problem in a properly installed system. Of course using Copper will remove all doubt and the Copper has other advantages also, especially in a short run system, but for those who choose to use Black iron they can do so with the confidence that it is a well proven an accepted choice and will work just fine.
Oldred said it well !

I do not understand the guys that bad mouth black iron piping in an air system, what to they think the tank on their compressor is made of ? I bet they do not drain daily as they should and have a nice rusted surface building away in thier supply tank.
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  #39 (permalink)  
Old 03-05-2011, 07:33 AM
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air lines

I totally agree. I drain my tank after each use. For me personally it was the easiest to work with and I didn't have to worry about messing up a measurement on the black pipe and running back and forth to the hardware store getting it re cut and threaded.
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  #40 (permalink)  
Old 03-05-2011, 07:35 AM
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Auto drain

My air compressor is up 10 ft on a platform and I bought a Harbor freight automatic drain that spits out a little water each time it cycles. I also put in a t with a line down so I can manually drain and check the HF stuff. We did a factory Demolition and I got about 200 ft of copper air lines . I used about 100 ft in the shop. When Ford shut down the Calif factory I got a bunch of 2 in iron air line pipe, valves , a lot of filter regulators and some automatic tool lubricators that have very small oil line inside the air host that meters oil each time a tool is used. they are still in boxes. The iron ford pipe was used for over 30 years with very little rust film inside. in most of the factories i've been in including Ford they use refrigerated dryers, Harbor freight now sells a small one , I haven't read any reviews so haven't bought one. A little bit of moisture caused $ 100 damage to my Plasma in a couple seconds, I now have a motor guard separator and the clear plastic ones that change color when it absorbs moisture.
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  #41 (permalink)  
Old 03-05-2011, 08:54 AM
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Copper pipe is lighter and easier to install than black iron pipe, and comes in three types.

Type L is identified with blue markings and K is identified with green markings; both are strong enough pressure-wise to use as air supply lines.

Type M is marked red and is not recommended since it is only rated for 125 PSI; that won't leave much of a margin for error.

Copper is smooth inside which means less pressure drop from friction.
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  #42 (permalink)  
Old 03-05-2011, 08:07 PM
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I was looking up the psi ratings for type m which I bought(3/4"). I found a site that said annealed working pressure is 326psi. I guess I'm a little lost on what to believe cause every site has a different rating. I'm assuming I will be fine with what I got. I just hope it holds up to the two compressor when I finally get one.
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Old 03-05-2011, 08:49 PM
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Quote:
Originally Posted by Chevelle427Rat
I was looking up the psi ratings for type m which I bought(3/4"). I found a site that said annealed working pressure is 326psi. I guess I'm a little lost on what to believe cause every site has a different rating. I'm assuming I will be fine with what I got. I just hope it holds up to the two compressor when I finally get one.
I'm not sure where he came up with 125psi?? It's well above that for annealed type M. I'm running 1/2" M pipe (Which granted, will have a higher burst pressure) and I'm running my compressor shutoff at 160psi.
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Old 03-05-2011, 08:52 PM
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Quote:
Originally Posted by hduff
Type M is marked red and is not recommended since it is only rated for 125 PSI; that won't leave much of a margin for error.
Where did you find this information?
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  #45 (permalink)  
Old 03-06-2011, 05:24 AM
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Type M is fine, and chances are you didn't anneal it if you didn't turn the color of the fittings blackish when you soldered them.

If you were braze the fittings then the pressure rating changes for service temps above 200f. (which you won't see so it doesn't matter)

I assume you soldered with 95/5.

Here is a chart that industry uses:
http://www.alaskancopper.com/pdf/cu/water_tubing_1.pdf

Bottom line, you are fine with your system, now get out there and use it!
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