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OPACITY GRADATION NUMBERS (1) AND RECOMMENDED USE FOR PLASMA CUTTING
Welding process
Cutting with plasma jet
(1 ) Depending on the conditions of use, the next highest or lowest category number may be used.
SAFETY AGAINST SMOKE, VAPORS, NOXIOUS AND TOXIC
GASES:
Cutting work must be carried out in suitably ventilated areas.
Gaseous
insalubrious, disturbing or dangerous for the health
of workers must be collected progressively as they
are produced, as close as possible to their
source of emission and as efficiently as possible.
(Art. R233-84 annexe 1
29/07/92)..
Fume collectors must be connected to an exhaust system.
See our catalogue and the :
"PRACTICAL GUIDE TO VENTILATION" N°7 concerning :
Arc welding operations of the National Institute of Research and
Safety, in which are to be found design methods and arious
practical examples of applications.
3 - SAFETY WHEN USING GASES
1) -HAZARDS
When gases are used incorrectly, they expose the user to two main
dangers, in particular when working in an enclosed space :
-The danger of asphyxia or poisoning
-The danger of fire or explosion
2)-PRÉCAUTIONS À RESPECTER
a) Storage in compressed form in cylinders
Comply with the safety recommendations given by the supplier and in
particular :
- Areas of storage or use of gases must be well ventilated, be
sufficiently far from an area of welding or cutting, and other sources of
heat, and be protected against a technical incident.
- Tie down cylinders, prevent impact.
- No excessive heat (> 50° C).
b) Pipes and hoses
- Periodically check the tightness of fixed pipes and rubber hoses.
The flexible pipes installed on our machines comply with standard
EN559 and therefore bear the year of construction.
Visually check the condition of the pipe surface every month. Pipes
must be changed if they show cracks or folds. Even if they are in good
condition, we recommend changing them every year.
- Never use a flame to detect a leak. Use an appropriate leak detector
or, if one is not available, water and a brush.
- Mark hoses with different colors, according to gases.
- Provide a CO² (carbon dioxide snow) extinguisher (5 kg or more) with
a nozzle near the equipment.
- Supply the gases at the pressures recommended in the equipment
manuals.
- Do not let hoses lie about in work shops. They could be damaged.
- Do not let hoses pass between your legs or over your shoulders. In
the event of a gas leak, you run the risk of serious burns. Check hoses
periodically.
c) Use of devices
- Only use devices designed for the gases employed.
- Pit flame arresting check valves to equipment :
- Never lubricate valves. Manipulate them with care.
- Never light your torch by opening just the acetylene.
- In the event of an incident, turn off first the supply of fuel gas.
10
0.5
2.5
10
1
5
15
9
2.2 RISKS OF INTERNAL INJURY
emissions,
or
fumes
which
Décret 92 767 du
3.1
INSTRUCTIONS COMMON TO ALL GASES
3-2 INTERVENTION FOLLOWING AN ACCIDENT
Current intensity in Amps
20
40
80
125
30
60
100
150
10
11
WE RECOMMEND THE USE OF SUITED WELDING BENCH WITH
EXHAUST OF FUMES (CONTACT US)
are
CHLORINATED SOLVENTS ARE A SPECIAL CASE (THEY ARE
USED FOR CLEANING OR REMOVING GREASE) :
The vapors of these solvents, under the effect of the radiation from an
arc, even at a distance, can be transformed into toxic gases.
The use of such solvents, other than in an enclosed chamber, is thus
prohibited in a place where electric arcs spark over.
NOISE:
Under certain operating conditions (cutting and welding parameters),
the sound level and acoustical power exceed values stipulated by the
regulations of the country.
In this case, the operator is to comply with the safety instructions of his
place of work, and use individual protective devices on his person.
In the case of very high power plasma welding, there is one other
solution : work with an immersed torch
PRESSURE RELIEF VALVE :
Do not forget to purge cylinder valves before connecting the pressure
regulator.
Check that the pressure relief screw is slackened off before
connection to the cylinder.
Check that, the union is tight before opening the valve on cylinder.
Open the cylinder valve slowly, but open it fully ( a partial opening
reduces flow rate to the torch and causes flash back).
In the event of a leak or when changing a gas cylinder, never loosen
a connecting element under pressure.
First close the valve of the cylinder or close the gas supply valves
upstream.
Drain the conduit using the gas test button located on the control
panel of the machine or carry out a heating control and cutting test.
For more information on the draining procedure of your
machine,
refer
to
instructions.
See the manual for your pressure relief valve
d)Working in enclosed spaces
Examples :
tunnels and crawl spaces
-
pipelines, ducts
-
holds of ships
-
wells, manholes, basements
-
cisterns, tanks, containers
-
ballast tanks
-
silos
-
reactors
-
Special precautions must be taken before undertaking welding work
in such enclosures where there is a very great danger of asphyxia
and poisoning and fire and explosion.
A work authorization procedure defining all the safety measures must
be systematically set up.
Ensure that there is adequate ventilation by paying special attention
to :
-under oxygenation
-over oxygenation
-excess of combustible gas
175
225
275
350
200
250
300
400
12
13
the
"Maintenance"
chapter
8695 7050
450
500
of
these
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