TIH · Toxic inhalation hazard · Isolate immediately upwind before approach

ERG 2024 · Guide 168

Carbon Monoxide (Refrigerated Liquid)

UN9202 · Carbon monoxide, refrigerated liquid (cryogenic liquid)

Class 9TIH

CHEMTREC · 24/7

1-800-424-9300

Right now: Move upwind. Isolate 100 m minimum. Deny entry. Call CHEMTREC with shipping paper in hand.

More contacts →

Green Table 1 — Initial isolation & protective action distances

Full table →

Small spill · Isolate

30 m

Day

0.1 km

Night

0.2 km

Large spill · Isolate

200 m

Day

1.2 km

Night

3.9 km

Potential Hazards

Health

TOXIC; Extremely Hazardous.
Inhalation extremely dangerous; may be fatal.
Contact with gas, liquefied gas or cryogenic liquids may cause burns, severe injury and/or frostbite.
Odorless, will not be detected by sense of smell.

Fire or explosion

EXTREMELY FLAMMABLE.
CAUTION: Flame can be invisible. Use an alternate method of detection (thermal camera, broom handle, etc.)
May be ignited by heat, sparks or flames.
Containers may explode when heated.
Vapor explosion and poison hazard indoors, outdoors or in sewers.
Vapors from liquefied gas are initially heavier than air and spread along ground.
Vapors may travel to source of ignition and flash back.
Runoff may create fire or explosion hazard.

Public Safety

General

CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper not available or no answer, refer to appropriate telephone number listed on the inside back cover.
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 (sewers, basements, tanks, etc.).
Ventilate closed spaces before entering, but only if properly trained and equipped.

Protective clothing

Wear positive pressure self-contained breathing apparatus (SCBA).
Wear chemical protective clothing that is specifically recommended by the manufacturer when there is NO RISK OF FIRE.
Structural firefighters' protective clothing provides thermal protection but only limited chemical protection.
Always wear thermal protective clothing when handling refrigerated/cryogenic liquids.

Evacuation

Immediate precautionary measure
Isolate spill or leak area for at least 100 meters (330 feet) in all directions.
Spill
See Table 1 - Initial Isolation and Protective Action Distances.
Fire
If tank, rail tank car or highway tank is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions.

Emergency Response

Fire

CAUTION: Flame can be invisible. Use an alternate method of detection (thermal camera, broom handle, etc.)
DO NOT EXTINGUISH A LEAKING GAS FIRE UNLESS LEAK CAN BE STOPPED.

Small Fire

Dry chemical, CO2 or water spray.

Large Fire

Water spray, fog or regular foam.
If it can be done safely, move undamaged containers away from the area around the fire.

Fire Involving Tanks

Fight fire from maximum distance or use unmanned master stream devices or monitor nozzles.
Cool containers with flooding quantities of water until well after fire is out.
Do not direct water at source of leak or safety devices; icing may occur.
Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank.
ALWAYS stay away from tanks in direct contact with flames.

Spill or leak

ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area.
All equipment used when handling the product must be grounded.
Do not touch or walk through spilled material.
Stop leak if you can do it without risk.
Use water spray to reduce vapors or divert vapor cloud drift. Avoid allowing water runoff to contact spilled material.
Do not direct water at spill or source of leak.
If possible, turn leaking containers so that gas escapes rather than liquid.
Prevent entry into waterways, sewers, basements or confined areas.
Isolate area until gas has dispersed.

First Aid

Refer to the “General First Aid” section.

Specific First Aid:

In case of contact with liquefied gas, only medical personnel should attempt thawing frosted parts.

TIH · Toxic inhalation hazard · Isolate immediately upwind before approach

ERG 2024 · Guide 168

Carbon Monoxide (Refrigerated Liquid)

UN9202 · Carbon monoxide, refrigerated liquid (cryogenic liquid)

Class 9TIH

CHEMTREC · 24/7

1-800-424-9300

Right now: Move upwind. Isolate 100 m minimum. Deny entry. Call CHEMTREC with shipping paper in hand.

More contacts →

Green Table 1 — Initial isolation & protective action distances

Full table →

Small spill · Isolate

30 m

Day

0.1 km

Night

0.2 km

Large spill · Isolate

200 m

Day

1.2 km

Night

3.9 km

Potential Hazards

Health

TOXIC; Extremely Hazardous.
Inhalation extremely dangerous; may be fatal.
Contact with gas, liquefied gas or cryogenic liquids may cause burns, severe injury and/or frostbite.
Odorless, will not be detected by sense of smell.

Fire or explosion

EXTREMELY FLAMMABLE.
CAUTION: Flame can be invisible. Use an alternate method of detection (thermal camera, broom handle, etc.)
May be ignited by heat, sparks or flames.
Containers may explode when heated.
Vapor explosion and poison hazard indoors, outdoors or in sewers.
Vapors from liquefied gas are initially heavier than air and spread along ground.
Vapors may travel to source of ignition and flash back.
Runoff may create fire or explosion hazard.

Public Safety

General

CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper not available or no answer, refer to appropriate telephone number listed on the inside back cover.
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 (sewers, basements, tanks, etc.).
Ventilate closed spaces before entering, but only if properly trained and equipped.

Protective clothing

Wear positive pressure self-contained breathing apparatus (SCBA).
Wear chemical protective clothing that is specifically recommended by the manufacturer when there is NO RISK OF FIRE.
Structural firefighters' protective clothing provides thermal protection but only limited chemical protection.
Always wear thermal protective clothing when handling refrigerated/cryogenic liquids.

Evacuation

Immediate precautionary measure
Isolate spill or leak area for at least 100 meters (330 feet) in all directions.
Spill
See Table 1 - Initial Isolation and Protective Action Distances.
Fire
If tank, rail tank car or highway tank is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions.

Emergency Response

Fire

CAUTION: Flame can be invisible. Use an alternate method of detection (thermal camera, broom handle, etc.)
DO NOT EXTINGUISH A LEAKING GAS FIRE UNLESS LEAK CAN BE STOPPED.

Small Fire

Dry chemical, CO2 or water spray.

Large Fire

Water spray, fog or regular foam.
If it can be done safely, move undamaged containers away from the area around the fire.

Fire Involving Tanks

Fight fire from maximum distance or use unmanned master stream devices or monitor nozzles.
Cool containers with flooding quantities of water until well after fire is out.
Do not direct water at source of leak or safety devices; icing may occur.
Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank.
ALWAYS stay away from tanks in direct contact with flames.

Spill or leak

ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area.
All equipment used when handling the product must be grounded.
Do not touch or walk through spilled material.
Stop leak if you can do it without risk.
Use water spray to reduce vapors or divert vapor cloud drift. Avoid allowing water runoff to contact spilled material.
Do not direct water at spill or source of leak.
If possible, turn leaking containers so that gas escapes rather than liquid.
Prevent entry into waterways, sewers, basements or confined areas.
Isolate area until gas has dispersed.

First Aid

Refer to the “General First Aid” section.

Specific First Aid:

In case of contact with liquefied gas, only medical personnel should attempt thawing frosted parts.