☣️ DOT HAZMAT CLASS 2
Gases
Compressed, liquefied, or dissolved gases—pressure, BLEVE potential, toxic/asphyxiation risk.
🧯☣️
⚠️ Training/quick-reference only. For real incidents, follow your SOP/SOG and the current ERG.
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Common hazards (high level)
- Pressure release / projectile hazards
- BLEVE potential when heated
- Toxic inhalation or asphyxiation
How to recognize
- Cylinders, tanks, or bulk gas transport
- Frosting, hissing, vapor clouds
- Placards indicating Class 2.x
First actions (before Hazmat team)
- Stage upwind and control ignition sources
- Isolate; evacuate threatened areas
- Cool exposed containers from safe positions (if directed)
- Request Hazmat; monitor atmosphere as per SOP
- Consult current ERG for protective actions
What NOT to do
- Do not enter vapor clouds without appropriate PPE
- Do not approach heated tanks without standoff
- Do not assume vapor is visible
Common examples
PropaneChlorineAmmoniaCO2 cylindersLPG
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FAQ
A Boiling Liquid Expanding Vapor Explosion can occur when a pressurized vessel fails under heat, releasing energy and fragments.
Many gas releases follow wind direction; upwind staging reduces inhalation risk.
Isolation, evacuation, ignition control, and Hazmat request—then ERG/SOP guided actions.
Sources (high level): DOT/PHMSA class & marking concepts, NFPA 704 overview concepts, and ERG usage principles. This guide does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.