Operating Precautions - ESAB C-84-42 Manual De Instrucciones

clean dry cloth, and examine them for nicks and
scratches. Remake the connection(s) and retest.
Do not try to light the torch until you are satisfied
that all connections are gas-tight.
ADJUSTING GAS PRESSURE
Fuel Gas: Open the fuel gas valve about one turn.
Turn in the pressure-adjusting screw on the fuel gas
regulator until its delivery-pressure gauge registers
the desired pressure (see cutting chart on page 4).
Then immediately close the fuel gas valve.
Oxygen: Open the cutting oxygen valve by de-
pressing its valve lever fully. Turn in the pressure-
adjusting screw on the oxygen regulator until its
delivery-pressure gauge registers the desired
pressure (see chart on page 4). Then release the
cutting oxygen lever.
NOTE: When gaugeless regulators are used, do not
open torch valves. Merely turn in the pressure-
adjusting screws to the desired pressures as in-
dicated on the scales of the regulator caps.
LIGHTING AND FLAME ADJUSTMENT
When using acetylene:
1. Open the fuel gas valve a fraction of a turn and
light the gas with a friction lighter. DO NOT USE
MATCH. Use of a match can seriously burn your
hand.
2. Continue opening the fuel gas valve until only
a trace of carbon soot is visible. Then open the
preheat oxygen valve until a neutral flame is
obtained.
3. Depress cutting oxygen valve lever and readjust
preheat flame to neutral by gradually opening
the preheat oxygen valve.
When using FG-2 or other fuel gases except acety-
lene:
1. Crack the fuel gas valve on the torch and light
the gas at the nozzle with a friction lighter. DO
NOT USE A MATCH. Use of a match could seri-
ously burn your hand.
2. Open fuel gas valve until flame just starts to
leave the end of the nozzle and then open the
preheat oxygen valve until the flames are at
their shortest length.
3. Depress the cutting oxygen valve lever and
then readjust the preheat flames to the shortest
length by opening the preheat oxygen valve
gradually.
The above procedures usually provide adequate
preheat for the nozzle in use. If desiring to change
the preheat flames, always hold the cutting oxygen
valve open while readjusting the preheat oxygen
and fuel gas valves.
SHUTTING OFF
Release the cutting oxygen valve lever. Then close
the fuel gas valve, and finally the preheat oxygen
valve.
If operations are to be stopped for a half-hour or
more, all pressure should be released from the
torch, hoses, and regulators by doing the follow-
ing:
1. Close each cylinder or station valve.
2. Open torch valves.
3. After relieving the gases, back out the pres-
sure-adjusting screw of each regulator and
close the torch valves.

OPERATING PRECAUTIONS

Flow: There must be proper flow of gases for safe
operation and full performance. This requires the
following three conditions: (1) the regulators that
determine the inlet pressure to the hoses must
be set to the correct pressure: (2) the hoses and
their connectors must have adequate capacity for
the job (hoses that are too long, too small or have
connectors with small passageways can cause
problems); and (3) the throttle valves on the torch
must be adjusted with the procedure shown in
these instructions.
Note: Items (1) and (2) can be checked by measuring
the gas pressures at the torch. Gauge adaptors
are available for this purpose.
Backfire: Improper operation of the torch may
cause the flames to go out with a loud 'pop'. Such
a back fire may be caused by contact of nozzle with
the work, by spatter from the work, by the use of
incorrect gas pressure, or by leakage at the cutting
nozzle seats due to dirt or nicks on seats or to a
loose nozzle nut.
Flashback: Under certain circumstances, the
flame may not "pop" out (backfire) abut instead
burn back inside the torch with a shrill hissing
or squeal. This is called "flashback". A flashback
should never occur if (1) the equipment is in good
condition; (2) preheat ports on cutting nozzles or
welding tips are cleaned frequently; (3) operating
pressures are correct; and (4) throttle valves are
adjusted properly. Should a flashback occur, IM-
MEDIATELY shut off the torch. Allow it to cool off
for at least a minute. Then check your nozzle or tip,
gas pressures, readjust regulators if necessary,
and relight the torch. If flashback recurs, send the
cutting torch with nozzle to ESAB Remanufacturing
Center, Ebenezer Road, Florence, SC 29501 or to
your distributor for repair.
3