SET-UP AND SAFE OPERATING PROCEDURES
7-49
0056-0114
Setting Up the Equipment for Cutting
WARNING
If the torch handle and hoses are already connected to the regulators, the system MUST
still be purged after each shut-down. Open the oxygen valve ½ turn. Allow the gas to
flow ten seconds for tips up to size 3, and 5 seconds for sizes 4 and larger for each
25 feet of hose in the system. Close the oxygen valve and purge the fuel system in the
same manner.
IMPORTANT
Always wear protective clothing and proper goggles to shield your eyes from infrared
light (see “Protective Apparel”), page 4).
14. Open the fuel valve on the torch handle approximately 1/8 turn and ignite the gas with a
spark lighter. Be sure the spark lighter is away from the tip and not obstructing the gas
flow.
15. Continue to increase the fuel supply at the torch handle until the flame stops smoking.
16. Slowly open the preheat oxygen control valve on the cutting attachment until the preheat
flame is established with a smooth inner cone.
17. Depress the cutting oxygen lever. If necessary, readjust the preheat flames slightly to a
neutral flame by increasing the preheat oxygen at the cutting attachment until the preheat
flames are again neutral. If the preheat flames are not the same size and the cutting oxygen
is not straight, turn off the torch and let it cool, then clean the tip.
WARNING
Never open and light the fuel gas torch and oxygen at the same time.
WARNING
If you experience a sustained backfire (flame disappears and/or a shrill hissing sound
is heard caused by the flame burning inside the cutting attachment), immediately turn
off the preheat oxygen control valve on the cutting attachment. Then turn off the torch
handle fuel valve. Allow the cutting attachment to cool before attempting to relight. If
backfire recurs, have the apparatus checked by a qualified repair technician before
using the apparatus again.
NOTE
Inspect the areas where slag and sparks will fall. Serious fires and explosions are caused
by careless torch operations. Take all possible precautions. Have fire extinguishers
available. Remove or protect flammable substances, including oxygen and fuel
hoses, before starting to work. Refer to Figure 23, page 54 for a graphic sequence of
recommended procedures for efficient flame cutting.
18. Hold the cutting attachment and torch handle comfortably in both hands. Stabilize the torch
and position the cutting tip preheat flames approximately ¼” from the base metal.
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