Chapter 5 Gas welding & cutting

20
10 30
ACETYLENE
0
bar
40
1 1,5
ACETYLENE
0,5
0 2,5
bar
2
20
ACETYLENE
10 30
0
bar
40
0,5
1
ACETYLENE
bar
1,5
2
0 2,5
PYROSAF 4 0
Additional recommendations:
• Secure the gas cylinders before use either at the workstation or on a suitable trolley.
• Use appropriate personal safety equipment: goggles, gloves, apron.
3 – Quick-action couplings
1
Maintenance
D - Check that coupling
are securely fastened.
D
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3
2
4
5
E - Check leaktightness*
in use at service pressure,
E
first with coupler secured,
then disconnected.
Golden rules
Always replace if an incident has occurred (crushing, damage)
or in case of malfunctioning (leak, pressure loss).
1 – Pressure regulator
Maintenance
A - Check threads to ensure
they are leaktight*.
A
B - Check pressure gauges.
C - Turn adjustment knob after
opening gas valve
and check that pressure rises
gradually.
C
Golden rules
• Never lubricate.
• SYMAP** recommends replacing pressure regulators
after no more than five years of service even
if they are still operating correctly.
2 - Hoses
Maintenance
Inspect the entire length of the
hose by bending it to make sure
it is in good condition. Check
for splits, cracking and swelling.
Golden rules
SYMAP** recommends replacing hoses after three years
of intensive use, otherwise once every five years..
B
A
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4 – Flashback
arrestors
1 - NORMAL OPERATION
Gas flow opens valve
Gas flows through sintered filter Spring Valve open
These are vital safety parts as
Torch
they prevent flame flashback
end
and gas mixture if the torch
NORMAL DIRECTION OF GAS FLOW
malfunctions.
They must be placed as closely 2 - TO PREVENT FLASHBACK
Shock wave closes valve
as possible to the torch or be Sintered filter stops flame
Sintered filter (flame arrestor)
Spring
built onto the handle.
Torch
Golden rules
end
end
• Always replace if flashback
NORMAL DIRECTION OF GAS FLOW
or damage has occurred.
• SYMAP** recommends replacing flashback arrestors
after no more than three years of service, even if they are still
in good condition.
5 - Torch
Maintenance
F - Check inlet connectors.
G - Check valves to ensure
they are leaktight*.
H - Check that nozzle or cutting
tip is in good condition
G
and check for any leakage.
Golden rules
SYMAP** recommends replacing
the torch after no more than five
years of service, even if it is still operating correctly.
H
F
Regulator
end
Valve closed
(non-return action)
Regulator
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Chapter 5
* To check leaktightness, use our “BUBBLE”
leak detector, Cat. no. W 000 010 963.
** SYMAP: Syndicat de la machine-outil du soudage
(french association of welding companies)
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