☣️ UN 3164 • CLASS 2
UN 3164 — Articles, pressurized, hydraulic (containing non-flammable gas)
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 3164 Quick Details
UN 3164
Product name: Articles, pressurized, hydraulic (containing non-flammable gas)
DOT Class: 2
Placard type: Non-Flammable Gas
ERG Guide: 126 (check current ERG)
Initial isolation: ERG 126: isolate spill/leak area immediate 25m in all directions; if tank/rail/tank truck involved in fire isolate 800m in all directions and consider initial evacuation 800m
Common Hazards of UN 3164
- 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
| Appearance | Manufactured articles containing hydraulic fluid and compressed non-flammable gas (typically nitrogen). Metal cylinders, accumulators, or similar devices appearing as industrial equipment components. |
| Flash Point | Not applicable (manufactured article) |
| Boiling Point | Not applicable (manufactured article) |
| Vapor Density | Not applicable (manufactured article) |
| Water Reactivity | No significant reaction expected |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3164
Extinguishing Media
Water spray, CO2, dry chemical, foam may be used for cooling
PPE Requirements
⚠️ Level D minimum for intact articles; Level C with SCBA if leak/rupture suspected; eye and face protection mandatory during handling
Isolation & Evacuation
ERG 126: isolate spill/leak area immediate 25m in all directions; if tank/rail/tank truck involved in fire isolate 800m in all directions and consider initial evacuation 800m
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 126).
First Actions for a UN 3164 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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📋 Copy & Share Field Card
UN 3164 — Articles, pressurized, hydraulic (contaiHAZMAT RADIO NOTE — UN 3164
Product: Articles, pressurized, hydraulic (containing non-flammable gas)
Class 2 / Non-Flammable Gas / ERG 126
PPE: Level D minimum for intact articles; Level C with SCBA if leak/rupture suspected; eye and face protection mandatory during handling
ISOLATION: ERG 126: isolate spill/leak area immediate 25m in all directions; if tank/rail/tank truck involved in fire isolate 800m in all directions and consider initial evacuation 800m
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 3164 — Articles, pressurized, hydraulic (containing non-flammable gas)
Class: 2 | Placard: Non-Flammable Gas | ERG Guide: 126
Appearance: Manufactured articles containing hydraulic fluid and compressed non-flammable gas (typically nitrogen). Metal cylinders, accumulators, or similar devices appearing as industrial equipment components.
Water Reactivity: No significant reaction expected
Extinguishing: Water spray, CO2, dry chemical, foam may be used for cooling
PPE: Level D minimum for intact articles; Level C with SCBA if leak/rupture suspected; eye and face protection mandatory during handling
Isolation: ERG 126: isolate spill/leak area immediate 25m in all directions; if tank/rail/tank truck involved in fire isolate 800m in all directions and consider initial evacuation 800m
— 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/3164 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN3164 Articles, pressurized, hydraulic (containing non-flammable gas) Cls2 ERG126 | allfirefighter.com/hazmat/un/3164SMS / 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/3164
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Frequently Asked Questions about UN 3164
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 D minimum for intact articles; Level C with SCBA if leak/rupture suspected; eye and face protection mandatory during handling
Water reactivity: No significant reaction expected. Recommended extinguishing: Water spray, CO2, dry chemical, foam may be used for cooling.
ERG Guide 126 recommendation: ERG 126: isolate spill/leak area immediate 25m in all directions; if tank/rail/tank truck involved in fire isolate 800m in all directions and consider initial evacuation 800m
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.