Victron energy MT 200 Série Guide D'installation Et D'utilisation page 16

Never open and light the fuel gas torch and oxygen at the same
time.
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.
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.
18. Hold the cutting attachment and torch handle comfortably in both
hands. Stabilize the torch and position the cutting tip preheat flames
approximately 1/4" from the base metal.
19. Direct the preheat flame to the spot where the cut is to begin.
Before the cutting action can start, preheat the starting point of
the metal to a bright cherry red kindling temperature. When the red
spot appears, depress the cutting oxygen lever slowly and fully.
20. When the cut starts, move the torch in the direction you wish to
cut.
Moving too slowly allows the cut to fuse together. Moving too fast
will not preheat the metal and the cut will be lost.
21. Continue to fully depress the cutting oxygen lever until the cutting
oxygen stream is past the base metal for a good drop cut.
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