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Old 10-17-2011, 12:58 PM
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Garage Piping Help

Hey guys,

I'm thinking of getting one of the two kits and would like your opinions. I know they are both pricey. I have copper now and I don't want to use PVC, gal pipe or black pipe. Your thoughts on these two products is appreciated. If you know of another quick connect system I would be interested in that as well. I will be using 3/4" tubing. Thanks



Kit - M7500
http://www.rapidairproducts.com/maxline_masterkits.asp

http://www.garage-pak.com/garage/pro...cat=294&page=1
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Old 10-17-2011, 03:08 PM
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Quote:
Originally Posted by daveh
Hey guys,

I'm thinking of getting one of the two kits and would like your opinions. I know they are both pricey. I have copper now and I don't want to use PVC, gal pipe or black pipe. Your thoughts on these two products is appreciated. If you know of another quick connect system I would be interested in that as well. I will be using 3/4" tubing. Thanks



Kit - M7500
http://www.rapidairproducts.com/maxline_masterkits.asp

http://www.garage-pak.com/garage/pro...cat=294&page=1
This is similar to PEX Tubing used in residential construction. You say you have copper now, why change? The only thing I don't like about the tubing is if you have long runs, you have to support it every couple of feet or it will "droop". I also really don't like all those connections. Just a place to start leaking IMHO.
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Old 10-17-2011, 05:20 PM
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I'm moving and want something quick so I can work on the car sooner?
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Old 10-17-2011, 05:40 PM
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use this until you can run new copper.
plastic doesn't cool like copper and those kits look ridiculously priced.
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Old 10-17-2011, 06:22 PM
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I set up the 3/4" rapid air system in our metal shop. I chose the rapid air system because it is one of the few places you can get 3/4" system good to 200psi which we needed.

3/4" is quite large actually. I have seen shops runt he DOT brake line in 3/4" but the pipe is a different size. I think the 3/4" DOT is OD and the Duratec is ID which makes a pretty good diameter for running air.

When you get into a larger diameter pipe the ability to hold pressure becomes more difficult.

The 3/4" DOT brake line was not good to 200 psi; actually the line is but the fittings are not; at least the fittings I found.

This is the same with copper. If you look at copper set up the pipe is good to substantial PSI but the joint is not (Don't get me wrong, it's certainly good for most lower psi applications).

We ran 200 psi down the shop in Rapidair/Duratec. We have branches for air tools. We lead these branches with regulators then run the DOT line.

The rapid air system is not as bad on cost as it seems. If you piece ANY line system together by the time you add up all the valves and fittings what seems like an economical system soon becomes as pricy as a packaged system.

If I had to do it all over again, I would do it just like we did it. It does however pay to plan out every fitting.

What are your needs for air?
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Old 10-17-2011, 06:24 PM
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By the way the rapid air/duratec is pretty rigid and just needs a couple support brackets.

I would not call it a quick disconnect system though.
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Old 10-17-2011, 07:12 PM
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Quote:
Originally Posted by gow589
The 3/4" DOT brake line was not good to 200 psi; actually the line is but the fittings are not; at least the fittings I found.

This is the same with copper. If you look at copper set up the pipe is good to substantial PSI but the joint is not (Don't get me wrong, it's certainly good for most lower psi applications).
I do not have any idea who put that thought into your head but it is incorrect.
A 3/4" pressure ( not a dwv fitting) fitting sweated with 95/5 solder is rated at 505# @ 200f.

http://www.copper.org/publications/p...e_handbook.pdf
page 27, table 4a.

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Old 10-17-2011, 07:16 PM
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Quote:
Originally Posted by daveh
I'm moving and want something quick so I can work on the car sooner?
You could use Shark Bite Fittings with copper.


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Old 10-18-2011, 07:03 AM
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I thought the Shark Bite was for water only. If it's acceptable for air then I would probably use that.

Is it ok for air?

Thanks
Dave
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Old 10-18-2011, 08:16 AM
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Shark bites will work fine, just a little $$$$. Solder is is the best way to go.
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Old 10-18-2011, 08:22 AM
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Quote:
Originally Posted by daveh
I thought the Shark Bite was for water only. If it's acceptable for air then I would probably use that.

Is it ok for air?

Thanks
Dave
Shark Bite does not rate them for compressed air. I believe the concern is if the fitting does release its grip you have the rapid expansion of the compressed gas, the same as disconnecting a quick coupler on an air hose. They do not want to accept any liability is my though.

You decide, I am not saying it is safe or not.

Myself I would just take the additional minute per fitting and sweat it and be done.
Be a hell of a lot cheaper and if you have 60 fittings you will spend only another hour or so with installation time.
If you want NOW fast, do as suggested and use a hose.
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Old 10-18-2011, 09:04 AM
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ouch! acording to homedepot.com a 3/4'' sharkbite fitting is $8.92 for a 90* elbow and for copper it is $4.50 for a bag of 10 (45c each).
that would be all the thinking-about-it i would need.
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