BUG-O Systems Flame Cutting - Manual (Page 11)

11
7. Slowly open the preheat oxygen valve until a
neutral flame is established (a sharp inner cone).
SPECIAL NOTE FOR TWO HOSE MACHINE
TORCHES ONLY: After the neutral flame has
been established as described, open the cutting
oxygen valve. Note that the preheat flames
change slightly from neutral to a carburizing flame
with a feather. With the cutting oxygen flowing,
adjust the preheat oxygen valve until the preheat
flames are again neutral.
8. If you experience a backfire or backflash (a hissing
sound when the flame is burning inside the cutting
torch) IMMEDIATELY turn off the preheat oxygen
valve, then shut off the torch fuel valve. Allow the
cutting torch to cool before attempting to re-use it. If
trouble persists, call your manufacturer’s repair center.
9. WHEN YOU FINISH YOUR CUTTING
OPERATION:
a. First shut off the oxygen preheat valve, then
shut off the torch fuel valve. If this procedure
is reversed, a “pop” may occur. The “pop”
throws carbon soot back into the torch and
may in time partially plug it.
b. Close both cylinder valves.
c. Open the torch oxygen preheat valve, and
release the pressure in the hose and regulator.
Close the torch valve.
d. Turn the adjusting screw on the oxygen
regulator counter-clockwise until the adjusting
spring pressure is released.
e. Open the torch fuel valve and release the
pressure in the hose.
f. Repeat “d” using fuel regulator.
g. Close all valves on torch handle and the
cutting attachment.
NOTE: The use of Reverse Flow Check Valves is
strongly recommended to reduce the possibility of
mixing gases in the hoses and regulator. Mixed gases
will rapidly burn once the torch is lighted. These
combustible gases can explode in the hoses, regulators
or cylinders, resulting in serious injury to the operator.
Flame Cutting Handbook.p65 5/9/2007, 8:06 AM 11