ANSI/ISA-12.04.04-2012 Pressurized Enclosures

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This standard applies to equipment made suitable for use in hazardous (classified) locations by pressurizing the use of a pressurizing system.

This standard applies both to equipment with and without an internal release of a flammable gas or vapor.

This standard does not apply to occupied portions of buildings such as ventilated to pressurized control rooms.