<VV> NEW TYPE SHOP AIR PLUMBING copper=good

[JVHRoberts at aol.com]

ACR is available lots of places. Grainger, ANY HVAC supply house, etc. And  
given that the new R410a systems run high side pressures of over 500 PSI,  
clearly it won't fail with shop air! The interesting thing is, when they made  the 
switch from R22 to R410a, they didn't rerate the tubing! 
 
In a message dated 2/16/2008 6:37:37 P.M. Eastern Standard Time,  
corvairduval at cox.net writes:

Ordinary  copper water pipe (tubing) is great for compressed air. For 
those who want  the skinny from the CDA (Copper Development Association) 
download their  handbook from:    
http://www.copper.org/resources/pub_list/pdf/copper_tube_handbook.pdf

Interesting  to note that even common type M is higher rated than we need 
for  compressed air use (table 3c). The limiting factor is found in table 
4,  the strength of joints. 50/50 Tin Lead is the weakest, rated at only 
200  psi @ 100 degrees F. Common lead free solder will give you 500 psi @ 
200  degrees F. That should be good enough for most shops!. Brazing the 
joints  gives the same rating as the annealed pipe charts.

ACR tubing is waay  above our needs, and harder to find at the big box 
stores.

Frank  DuVal


 



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