☣️ UN 3163 • CLASS 2
UN 3163 — Liquefied gas, n.o.s.
Placard: Non-Flammable Gas. ERG Guide 126. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
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UN 3163 Quick Details
UN 3163
Product name: Liquefied gas, n.o.s.
DOT Class: 2
Placard type: Non-Flammable Gas
ERG Guide: 126 (check current ERG)
Initial isolation: ERG 126: isolate 100m all directions initially; evacuate 800m downwind if tank/rail car involved in fire
Common Hazards of UN 3163
- Some may burn but none ignite readily.
- Containers may explode when heated.
- Ruptured cylinders may rocket.
- Vapors may cause dizziness or asphyxiation without warning, especially when in closed or confined areas.
- Vapors from liquefied gas are initially heavier than air and spread along ground.
- Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
- Fire may produce irritating, corrosive and/or toxic gases.
Chemical Identity & Physical Properties
| Also known as | Compressed gas n.o.s.Liquefied compressed gasRefrigerated liquefied gas n.o.s.Cryogenic liquid n.o.s. |
| Appearance | Colorless to various colored liquefied gas under pressure. Physical state and odor vary depending on specific gas; typically stored as liquid under pressure in cylinders or tanks. |
| Flash Point | Not applicable (liquefied gas) |
| Boiling Point | Varies widely depending on specific gas (-269C to 100C typical range) |
| Vapor Density | Varies; typically heavier than air (>1.0) for most liquefied gases |
| Water Reactivity | Generally no significant reaction with water, though some specific gases may react |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3163
Extinguishing Media
Water spray to cool containers, dry chemical, CO2; foam generally not effective on gas releases
PPE Requirements
⚠️ Level B minimum with SCBA; Level A if gas identity unknown or toxic vapors suspected; insulated gloves for cryogenic liquids
Isolation & Evacuation
ERG 126: isolate 100m all directions initially; evacuate 800m downwind if tank/rail car involved in fire
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 126).
First Actions for a UN 3163 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Many gases are heavier than air and will spread along the ground and collect in low or confined areas
- Ventilate closed spaces before entering, but only if properly trained and equipped.
- Isolate spill or leak area for at least 100 meters (330 feet) in all directions.
- Consider initial downwind evacuation for at least 500 meters (1/3 mile).
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UN 3163 — Liquefied gas, n.o.s.HAZMAT RADIO NOTE — UN 3163
Product: Liquefied gas, n.o.s.
Class 2 / Non-Flammable Gas / ERG 126
PPE: Level B minimum with SCBA; Level A if gas identity unknown or toxic vapors suspected; insulated gloves for cryogenic liquids
ISOLATION: ERG 126: isolate 100m all directions initially; evacuate 800m downwind if tank/rail car involved in fire
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 3163 — Liquefied gas, n.o.s.
Class: 2 | Placard: Non-Flammable Gas | ERG Guide: 126
Appearance: Colorless to various colored liquefied gas under pressure. Physical state and odor vary depending on specific gas; typically stored as liquid under pressure in cylinders or tanks.
Water Reactivity: Generally no significant reaction with water, though some specific gases may react
Extinguishing: Water spray to cool containers, dry chemical, CO2; foam generally not effective on gas releases
PPE: Level B minimum with SCBA; Level A if gas identity unknown or toxic vapors suspected; insulated gloves for cryogenic liquids
Isolation: ERG 126: isolate 100m all directions initially; evacuate 800m downwind if tank/rail car involved in fire
— Key Hazards —
• Some may burn but none ignite readily.
• Containers may explode when heated.
• Ruptured cylinders may rocket.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• Keep unauthorized personnel away.
• Stay upwind, uphill and/or upstream.
• Many gases are heavier than air and will spread along the ground and collect in low or confined areas
SOURCE: allfirefighter.com/hazmat/un/3163 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3163 Liquefied gas, n.o.s. Cls2 ERG126 | ERG 126: isolate 100m all directions initially; evacuate 800m downwind if tank/r | allfirefighter.com/hazmat/un/3163SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/3163
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Frequently Asked Questions about UN 3163
Some may burn but none ignite readily. Containers may explode when heated. Ruptured cylinders may rocket. Vapors may cause dizziness or asphyxiation without warning, especially when in closed or confined areas. Vapors from liquefied gas are initially heavier than air and spread along ground. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire may produce irritating, corrosive and/or toxic gases.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level B minimum with SCBA; Level A if gas identity unknown or toxic vapors suspected; insulated gloves for cryogenic liquids
Water reactivity: Generally no significant reaction with water, though some specific gases may react. Recommended extinguishing: Water spray to cool containers, dry chemical, CO2; foam generally not effective on gas releases.
ERG Guide 126 recommendation: ERG 126: isolate 100m all directions initially; evacuate 800m downwind if tank/rail car involved in fire
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 126 and your department SOP/SOG for incident-specific protective actions.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles.
This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.