StoreX
Series
STX_V078.doc
43
CMa,
23.11.2009
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Limited access and exits
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Increased likelihood of gas accumulation through leaks
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Increased asphyxiation risk
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Fire and explosion hazard
To be considered as confined spaces are the inside rooms of a building,
laboratory rooms, machine pits, culverts, basement trenches for piping. When
working in confined spaces, it is advisable that operators and other personnel are
fully aware of the hazards of oxygen deficiency and adopt the following practices:
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A fully documented permit to work system
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Personal and fixed oxygen analyzers
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Self contained breathing apparatus available for use and all personnel fully
trained in its use
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Personnel harnesses and ropes
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Operation of the "buddy system"
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A system of fresh air ventilation and fume extraction
In the case of permanent presence of personnel in a room where there are risks
of oxygen depletion mixture, ventilation must be maintained with at least 30mJ
per hour per person. The volume of air introduced per hour must not be less than
twice the enclosed space in question. Ventilation should never be carried out with
pure oxygen, but solely with air.
Testing of Oxygen or Gas Content
At present, various types of oxygen analyzers are available, which are often
simple and reliable to operate. Such a monitor should at least have
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A readout of the actual gas concentration
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A settable alarm threshold value
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An alarm output with an acoustic and optical alarm connected
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An error output that shows malfunction of the monitor
Ideally the monitor should be placed so that it can be read inside, as well as from
outside, the room which has gas present. The selection of the type of apparatus
depends on the nature of the work in the place to be monitored (temperature,
multiple detectors, portable equipment, etc). The picture below shows such a
monitor for CO2.
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