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Copper Tubing For Replacement Air Line???

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PS

Joined: 08 Sep 2006
Posts: 84
Location: Texas

Posted: Sun Feb 11, 2007 3:33 pm Post subject: Copper Tubing For Replacement Air Line???

I spent hours Friday searching for metric aluminum tubing to replace  damaged tubing connecting the main air valve, terminating at  the aft bulkhead next to the rear seat. I bought a roll of 1/4" copper tube  and decided to resize and use the metric fittings from my old air  line. I tried a few different methods of shrinking the tube with  poor results. I decided to tie one end of the copper to my trailer  hitch and the other to a come-a-long attached to another vehicle. I stretched  the tube and checked the diameter with a micrometer until I had the desired  diameter. My shade tree engineering worked better than I hoped  for. I replaced the damaged tubing with the newly sized copper used the  original fittings and went flying.    I was told 1/4" tubing  (un-stretched) is good for 4000 psi. I am guessing if I lose half the  strength in the stretching process, I still have a safety factor of  around 2. Are there any reasons why I shouldn't use copper?

  

 Phil 

 N700HS CJ6A

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_________________
Phil

dsavarese(at)elmore.rr.co
Guest

Posted: Sun Feb 11, 2007 3:55 pm Post subject: Copper Tubing For Replacement Air Line???

Copper will work just fine.  I have found it difficult to find  metric aluminum tubing and have substituted copper tubing and not had any  problems whatsoever.  Maybe someone else on the Yak list has a good source  for 6 mm and 8 mm aluminum tubing.

 Dennis

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JOE HOWSE

Joined: 10 Jan 2006
Posts: 140
Location: DUNCAN BC CANADA

Posted: Sun Feb 11, 2007 7:32 pm Post subject: Copper Tubing For Replacement Air Line???

PHIL



Copper can be annealed (softened)  by heating and quenching.

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J.C. HOWSE

pa3arw(at)euronet.nl
Guest

Posted: Mon Feb 12, 2007 12:24 am Post subject: Copper Tubing For Replacement Air Line???

Phil,  

   

It is not even “normal” aluminium either but so called  “dural aluminium” which probably is even more difficult to find. The latter is much harder and tougher than the normal aluminium. In Holland the normal aluminium is rather easy to get the dural type just a bit more difficult.  

   

Dennis, is copper not a bit too soft??  

     

Hans  

        

  

Van: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] Namens PSalter(at)aol.com

 Verzonden: maandag 12 februari 2007 0:32

 Aan: yak-list(at)matronics.com

 Onderwerp: Copper Tubing For Replacement Air Line???  

  

     

   

    

   

    

I spent hours Friday searching for metric aluminum tubing to replace damaged tubing connecting the main air valve, terminating at the aft bulkhead next to the rear seat. I bought a roll of 1/4" copper tube and decided to resize and use the metric fittings from my old air line. I tried a few different methods of shrinking the tube with poor results. I decided to tie one end of the copper to my trailer hitch and the other to a come-a-long attached to another vehicle. I stretched the tube and checked the diameter with a micrometer until I had the desired diameter. My shade tree engineering worked better than I hoped for. I replaced the damaged tubing with the newly sized copper used the original fittings and went flying.    I was told 1/4" tubing (un-stretched) is good for 4000 psi. I am guessing if I lose half the strength in the stretching process, I still have a safety factor of around 2. Are there any reasons why I shouldn't use copper?  

    

   

    

Phil   

    

N700HS CJ6A  

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rkent(at)wlacrussianeng.c
Guest

Posted: Mon Feb 12, 2007 12:31 am Post subject: Copper Tubing For Replacement Air Line???

We looked into the aluminium tubing. We found that we could obtain the  correct material, with all the required properties and strengths, in drawn  lengths of 1.5m for approx $2.5 per length. The downside was that a minimum  order would have been 4000 lengths, when we only use a max of a  dozen per year we decided to stick with the metric copper tubing which is  much easier to obtain in small quantities.

  

 Regards

  

 Rob Kent

Stores Manager

WLAC - Russian Engineering

www.wlacrussianeng.co.uk

  

 Tel: +44 1628 829 165

Fax: +44 1628 825 975

Mob: +44 7842 964  358

  

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dsavarese(at)elmore.rr.co
Guest

Posted: Mon Feb 12, 2007 4:52 am Post subject: Copper Tubing For Replacement Air Line???

Hans,

 The copper tubing that I have purchased was not too soft as  far as I could tell.  I guess my question is, too soft for what?  It  certainly doesn't bend any easier than the normal aluminum tubing.  The  reason I had to use copper was the unavailability of aluminum metric  tubing.

 Dennis

  

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dsavarese(at)elmore.rr.co
Guest

Posted: Mon Feb 12, 2007 6:45 am Post subject: Copper Tubing For Replacement Air Line???

Please help us locate a source for acceptable 6 mm and 8 mm aluminum tubing. 

I personally would appreciate it very much.

Dennis



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ggg6(at)att.net
Guest

Posted: Mon Feb 12, 2007 6:53 am Post subject: Copper Tubing For Replacement Air Line???

Gentlemen,  does anyone have a connection in China for the Alumimun Tubing,, they gladly export most everything?    

  

Gary Gabbard       CJ  N22YK

 [quote]-------------- Original message from "A. Dennis Savarese" <dsavarese(at)elmore.rr.com>: -------------- 

[quote] --> Yak-List message posted by: "A. Dennis Savarese" 

 

 Please help us locate a source for acceptable 6 mm and 8 mm aluminum tubing. 

 I personally would appreciate it very much. 

 Dennis 

 

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valleyauto(at)clearwire.n
Guest

Posted: Mon Feb 12, 2007 8:00 am Post subject: Copper Tubing For Replacement Air Line???

I have a frend in china ,he also owns a yak. I will  check with him.

  

 Don Milbourn 

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