The general understanding regarding inert entry is there is no need to worry about flammable vapour /gas concentration (LEL) since Oxygen is maintained at 5% or less. (hence no sufficient Oxygen to support fire).
However, in API 2217A (INERT CONFINED SPACE ENTRY STANDARD) there is a limit for flammable vapour/gas concentration.
It is 10% of LEL for hot work inside inert confined space
and 20% of LEL for doing cold work inside inert confined space.
If 20% of LEL is exceeded entrants shall evacuate inert confined space.
Can someone explain the logic behind these limits for flammable vapour/gas concentration even when Oxygen is less than 5%?
However, in API 2217A (INERT CONFINED SPACE ENTRY STANDARD) there is a limit for flammable vapour/gas concentration.
It is 10% of LEL for hot work inside inert confined space
and 20% of LEL for doing cold work inside inert confined space.
If 20% of LEL is exceeded entrants shall evacuate inert confined space.
Can someone explain the logic behind these limits for flammable vapour/gas concentration even when Oxygen is less than 5%?