Build Worker BPSMIG140 Traduction Des Instructions D'origine page 28

PIPES AND HOSES
The gas supplier's safety instructions must be
followed, and in particular:
1. Pipes colour coded for the gasses must be used.
2. The recommended distribution pressure must be
adhered to.
3. Fixed pipes and rubber hoses should be checked
for leaks regularly. To do this use a suitable sensor,
or if this is not available, a paint brush and soapy
water. Never use a flame to find a leak.
4. Pipes should be protected to minimise damage in
the workshop.
PRESSURE VALVE
The gas supplier's safety instructions must be
followed, and in particular:
1. The cylinder taps should be bled before
connecting the pressure valve.
2. The pressure adjusting screw should be
unscrewed before connection to the cylinder.
3. Check the tightness of the connection union
before opening the cylinder tap.
4. Open the cylinder tap slowly and by a fraction of
a turn.
5. Never loosen a union under pressure, close the
cylinder tap first.
6. The pressure valve should correspond with the
gas necessary for the process
WORK IN A CONFINED SPACE
A working permit system defining all the safety
measures should always be des implemented
before starting welding/cutting operations in
confined spaces such as galleries, pipes, pipe-lines,
holds of ships, wells, inspection holes, , cellars,
tanks, vats, reservoirs, ballast tanks, silos and
reactors. Suitable ventilation should be installed
paying particular attention to on shortages of
oxygen, excesses of oxygen and excesses of
combustible gasses.
ACTION FOLLOWING AN ACCIDENT
In the event of an unignited leak:
• Turn off the gas supply; do not use a flame or any
electrical appliance in the leakage area.
In the event of an ignited leak:
• If the tap is accessible, turn off the gas supply and
use powder fire extinguishers;
• If it is not possible to stop the leak, let it burn and
cool the cylinders and the neighbouring installations.
In the event of asphyxiation:
• The work area should only be entered wearing
protective gear; otherwise you could become the
second victim.
• Transport the victim into the fresh air and start
artificial respiration.
GAS MIXTURES CONTAINING LESS THAN 20 %
OF CO2
If these gasses or mixtures replace the oxygen in
the air there is a risk of asphyxiation because an
atmosphere containing less than 17 % of oxygen is
dangerous.
HYDROGEN AND HYDROGEN BASED GAS
MIXTURES
In the event of a leak, the hydrogen and hydrogen
based gas mixtures collect under the ceiling or in
cavities. Install ventilation in the danger areas and
store cylinders in the open air or in a well
ventilated place. Reduce the risk of leaks by limiting
the number of unions.
Hydrogen and hydrogen based gas mixtures are
inflammable.
There is a danger of burns or explosion. Air /
hydrogen and oxygen / hydrogen mixtures are
explosive in the following ranges of
proportions: 4 to 74,5 % of hydrogen in air and 4 to
94 % of hydrogen in oxygen.
PERSONEL SAFETY
The operator should always wear
personal protective equipment designed for
welding/cutting work. This protection should be:
• insulating (kept dry) to prevent electric shocks;
• clean (no oil present) to prevent ignition;
• and in good condition (no tears) to prevent burns.
BUILD WORKER offers a wide range of personal
protective equipment to satisfy your requirements.
Welding/cutting equipment may be heavy. To avoid
work-related musculoskeletal disorders, adopt a
good technique when handling the load.
Keep protective equipment on while the welds are
cooling as slag and slag components may spit.
ELECTROMAGNETIC FIELDS
Any electric current passing through
a conductor creates a localised electrical and
magnetic field. The welding/cutting current causes
an electromagnetic field around the cables
and equipment. Exposure to electromagnetic fields
may have effects that are currently unknown. It is
possible to reduce exposure to electromagnetic
fields caused by the welding circuit by taking the
following action:
1. Join the electrode holder cable or the welding
harness and the return current cable together over
the longest length possible
– Fix them together with adhesive tape;
2. Never wrap the welding/cutting cable round your
body or rest it on your shoulder;