Subject: 1/7th rule and other

From: [email-masked](Alan D. Bartz)
Date: 14 May 1996 13:33:47 GMT

"Modern Welding, complete coverage of the welding field in one easy to 
use volume" has many specifics concerning acetylene cylinders.  They 
state" The maximum safe rate for drawing acetlyene from a cylinder is 
1/7th of the cylinder's capacity per hour.  Thus, a single 250 cubic 
foot (7.08 cu meter) cylinder can supply acetylene at about 36 cubic 
feet (1.0 cu meters) per hour."

to further quote:"An oxyacetylene flame consuming some acetone will 
burn with a purple color.  Acetone in the flame is not desirable.  It 
lowers the flame temperature and increases gas consumption.  Moreover, 
the quality of the weld is affected."

"Acetelene cylinders should always be used in an upright position, 
otherwise, some of the acetone is likely to escape with the acetylene 
and contaminate the equipment and the flame.  Each time that an 
acetylene cylinder is refilled, the tare weight (weight without the 
acetylene gas) is checked and acetone is added if necessary."

I would highly recommend a complete novice or anyone not familiar with 
any type of welding process seek further education from text books and 
a class on welding safty and proceedures.  Many vocational schools 
offer evening welding classes to adults.  Its worth checking into.

Please contact your welding supplier for safty booklets.  They are 
usually available free of charge and provide many helpful hints.

Hope this helps.

Alan