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Tool Talk Discussion Forum

AIR LINES

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RJC

07-26-2004 20:05:42




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Been reading the posts about pvc and copper air lines. What is the difference in type L,K & M copper? Went to local home store but couldn't find any aluminum compressed air pipe.




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Ron

07-27-2004 05:11:58




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 Re: AIR LINES in reply to RJC, 07-26-2004 20:05:42  
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Rod (NH)

07-26-2004 21:03:31




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 Re: AIR LINES in reply to RJC, 07-26-2004 20:05:42  
Basically copper tube types K, L and M are tubes of different wall thicknesses. K is the thickest and M is the thinnest. If you look at only the tube, the thicker wall thickness has a higher working pressure. If you are going to use typical solder joints though, the joints become the weakest link in all three types. The working pressure then is determined by the type of solder and not the tube type itself. In other words, the working pressure is the same for all three types with soldered joints, depending on which solder is used. See this chart. With soldered joints, the advantage of higher wall thicknesses is a greater degree of resistance to external physical abuse. Type L is commonly used with 95/5 tin/antimony solder for compressed air systems.

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