<VV> Air compressor distribution lines

[Garth Stapon]

Group:

Mapp, propane, propylene, chemelene, yukon 96, FG2 and all LPG type fuels burn with an oxidizing flame. The combustion ratio is 3.5 to 4.0 parts oxygen to one part fuel gas. All are heavier than air. You can braze with them and many people do.

Acetylene set to a neutral flame burns at 1.4 parts oxygen to one part acetylene and is more easily set to a carburizing (reducing condition).

For brazing, acetylene is king as when the flame is set correctly, there is a much lower chance of oxidizing the base metal. When oxide forms (such as copper oxide) it typically melts at a much higher temperature than the braze alloy which makes it difficult for the braze/solder material to bond effectively with the substrate.

Acetylene is also lighter than air, so it floats away if there is a leak (this is why telephone repair crews use it in manholes) - as there is no chance of displacing oxygen causing death. 

There is a big potential problem when working in a confined space with a fuel gas that is heavier than air.

Be safe, be informed!

I have a paper on fuel gases if you want a copy, just e mail me off list and I will forward it.

Regards, Garth


-----Original Message-----
From: Rt66Vairs at aol.com
Sent: Nov 1, 2005 11:37 AM
To: JVHRoberts at aol.com, virtualvairs at corvair.org
Subject: Re: <VV> Air compressor distribution lines

 
In a message dated 10/31/2005 3:03:15 PM Pacific Standard Time, JVHRoberts  
writes:

The silver solder I am talking about is sold in HVAC stores. Not  
particularly high melting point, but FAR stronger than ANY plumbing solder.  Make sure 
you use the right flux. That's what I used, and my system is plumbed  with 7/8" 
refrigeration tubing and fittings. Light, easy to run, flexible,  perfect. And 
given that the head pressure on a heat pump can hit 300 PSI, I am  not 
worried about anything coming apart. 



This is absolutely correct and a MAPP Gas torch will do the job on 3/4'  
copper pipe which is
as big as most of us will ever need
 
Tim (starting to recover from Palm Springs) Abney
IECC
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