[TheForge] Volume of a #4 acetylene cylinder?

[Keporter at aol.com]

In a message dated 7/5/2005 3:22:00 P.M. Pacific Standard Time,  
Keporter at aol.com writes:

Why  aren't folks using propylene for steel welding?    Does it require a  
new 
set of tips or can acetylene tips be used  in  torches?




Acetylene tips are not interchangeable with any other fuel gas; this is  
because the propagation rate (flame speed) is about twice that of every other  
fuel gas, except hydrogen, which is even faster yet. In order for tips to be  
interchangeable, the flame speeds of different gaseous fuels have to be pretty  
close. You can use MAPP tips as propylene tips. You must check with the tip  
manufacturer to see if a propylene tip can be used with MAPP, however, because  
MAPP has fifteen percent acetylene in it; so the tip must be made from the 
right  kind of alloy to avoid forming explosive acetylides when exposed to 
acetylene  content.
Mike P.