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NFPA 496
Purged and Pressurized Enclosures
Purged and Pressurized Enclosures. Governs hazardous areas requirements for defense energetics facilities.
Changed in latest edition: Latest edition revised scope, definitions and testing criteria; review projects designed to the prior edition.
Applies to Features of Work (24)
- Propellant MixingCritical
- Propellant CastingCritical
- Base Bleed AssemblyMedium
- Solvent RecoveryCritical
- Dust CollectionHigh
- Electrical SubstationMedium
- Lightning ProtectionCritical
- Propellant Extrusion – Building 100Critical
- Propellant Curing – Building 100Critical
- Nitrocellulose Handling – Building 100Critical
- Hazardous Ventilation – Building 100High
- Emergency Power – Building 100Medium
- Propellant Mixing – Building 200Critical
- Propellant Casting – Building 200Critical
- Base Bleed Assembly – Building 200Critical
- Solvent Recovery – Building 200Medium
- Dust Collection – Building 200High
- Electrical Substation – Building 200Medium
- Lightning Protection – Building 200Medium
- Propellant Extrusion – Line ACritical
- Propellant Curing – Line ACritical
- Nitrocellulose Handling – Line ACritical
- Hazardous Ventilation – Line AHigh
- Emergency Power – Line AMedium
Required for Equipment (5)
- Explosion Isolation ValveExplosion Protection
- Diesel GeneratorElectrical
- Motor Control CenterElectrical
- Lightning Protection SystemElectrical
- Purged Enclosure (Type X)Electrical
Crosswalk
NFPA 496↔IEC 60079-2Pressurized enclosuresSimilar
NFPA 496↔2014/34/EUSurge protectionPartial