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About This Item


Full Description

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 or pressurized control rooms.

Document History

  1. ISA 12.04.04-2012


    Pressurized Enclosures

    • Most Recent
  2. ISA RP12.4-1996

    Pressurized Enclosures : RP12.4

    • Historical Version