Hydrogen tube trailer hazard diamond visual check online practice free
Hydrogen is a flammable gas, so a hydrogen tube trailer carries the red Division 2.1 flammable gas placard, with a flame symbol and a 2, and it will show the identification number for hydrogen. A tube trailer is a bundle of long high-pressure cylinders, so the hazard is a compressed, highly flammable gas. Red plus flame plus 2 is the read.
Hydrogen is a flammable gas
Hydrogen burns readily, so in transport it is a Division 2.1 flammable gas. That means the red placard with a flame symbol and the number 2. Like propane and LNG, it is in the flammable-gas family, which is red, not the green used for non-flammable gases. The flammability is the defining hazard.
What a tube trailer is
A tube trailer is a trailer carrying several long, large-diameter high-pressure cylinders (tubes) bundled together, used to move compressed gases like hydrogen in bulk. So a hydrogen tube trailer combines two hazards: a highly flammable gas and high pressure. The placard tells you the flammable-gas part; the configuration tells you it is compressed.
What the placard shows
The cues on a hydrogen load:
| Element | Hydrogen (2.1) |
|---|---|
| Color | Red |
| Symbol | Flame |
| Class number | 2 (Division 2.1) |
| ID number | Hydrogen's UN number shown |
| Extra hazard | High pressure (tube trailer) |
Red flammable-gas placard, number 2, with the ID number. Confirm specifics in your manual and the papers.
Why it sits with the flammable gases
Even though hydrogen is also carried under extreme pressure, its placard follows the gas division, and hydrogen is flammable, so it is Division 2.1, red. The pressure is a real danger but does not change the placard color; the flammable-gas hazard is what the diamond communicates. Compare it with green 2.2 non-flammable gases like nitrogen to keep the distinction clear.
How to study and verify
Anchor hydrogen as red, flame, 2, a flammable gas, and remember a tube trailer adds the high-pressure dimension. Practice it alongside other flammable gases (propane, LNG) and against the green non-flammable gases so the red-versus-green split stays sharp. Confirm the exact identification number and any specifics with the shipping papers and your official manual.
Frequently asked questions
- What placard does a hydrogen tube trailer use?
- Hydrogen is a flammable gas, so the red Division 2.1 placard with a flame and a 2, plus hydrogen's identification number. A tube trailer carries it as high-pressure compressed gas. Confirm specifics with the shipping papers and your manual.
- Is hydrogen red or green?
- Red. Hydrogen is a flammable gas (Division 2.1), so it uses the red flammable-gas placard, not the green used for non-flammable gases like nitrogen.
- What is a tube trailer?
- A trailer carrying several long high-pressure cylinders bundled together to move compressed gases like hydrogen in bulk. The hazard is a flammable gas under high pressure.