Notice NOT 020
THERMAL ARC 155 SE
Rev : 02
Date : 25/10/06
SAFETY
USER’S MANUAL
Page
12/22
3.3.3.
DETAILS ABOUT GASES
Gas and gaseous mixtures containing less than 20% of CO
2
:
If these gases or mixtures take the place of the oxygen in the air, there is a danger of asphyxia. An
atmosphere containing less than 17% oxygen is dangerous.
hydrogen and hydrogen-based combustible gaseous mixtures
These are very light gases. In the case of leaks, they collect under the ceiling.
Provide for ventilation at ceiling level.
These are also inflammable gases. The flame of hydrogen is almost invisible. There is therefore a risk of
burns.
Air/hydrogen and oxygen/hydrogen mixtures are explosive in the following proportions:
- 4 to 74.5 % of hydrogen in air.
- 4 to 94 % of hydrogen in oxygen.
Store the bottles in the open or in a well-ventilated place.
Avoid any leakage by limiting the number of connections or couplings to a minimum.
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