6.1.2. The atmosphere is sufficiently depleted of oxidant (normally
the oxygen in air) that it cannot support combustion
Safety may be based on reducing the oxidant concentration
below a level that will no longer support combustion (LOC), by
adding an inert gas. Nitrogen gas is perhaps the most commonly
used inert gas. Other inert gases include carbon dioxide, argon,
helium, steam, and flue gas (waste gas from on-site processes).
Oxidant can also be removed by working under vacuum (safe
vacuum pressure should be obtained by testing).
Limiting Oxidant Concentration (LOC) for combustion is
dependent on the type of dust and type of inert gas used. Once the
LOC of the dust has been determined for the inert gas that will be
used, the inert gas needs to be introduced into the vessel.
Successful inert gas blanketing will only be possible if the entire
volume of the vessel is inerted and the inert atmosphere is maintained
at all times, even when the vessel is opened during the
addition of solids and/or liquids to the vessel.
6.1.2. The atmosphere is sufficiently depleted of oxidant (normally
the oxygen in air) that it cannot support combustion
Safety may be based on reducing the oxidant concentration
below a level that will no longer support combustion (LOC), by
adding an inert gas. Nitrogen gas is perhaps the most commonly
used inert gas. Other inert gases include carbon dioxide, argon,
helium, steam, and flue gas (waste gas from on-site processes).
Oxidant can also be removed by working under vacuum (safe
vacuum pressure should be obtained by testing).
Limiting Oxidant Concentration (LOC) for combustion is
dependent on the type of dust and type of inert gas used. Once the
LOC of the dust has been determined for the inert gas that will be
used, the inert gas needs to be introduced into the vessel.
Successful inert gas blanketing will only be possible if the entire
volume of the vessel is inerted and the inert atmosphere is maintained
at all times, even when the vessel is opened during the
addition of solids and/or liquids to the vessel.
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