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Road Trailer Identification Chart*

Road Trailers may be jacketed, the cross-section may look different than shown and external ring stiffeners would be invisible.
An emergency shut-off valve is commonly found at the front of the tank, near the driver door.
MC331, TC331, SCT331. Rear and side view of a liquefied compressed gas tank trailer. Guide 117.
  • For liquefied compressed gases (e.g., LPG, ammonia)
  • Rounded heads
  • Design pressure between 100-500 psi
MC338, TC338, SCT338 Cryogenic Liquid Tank (TC341, CGA341). Rear and side view of a cryogenic liquid tank trailer. Guide 117.
  • For refrigerated liquefied gases (cryogenic liquids)
  • Similar to a "giant thermo-bottle"
  • Fitting compartments located in a cabinet at the rear of the tank
  • MAWP between 25-500 psi**
DOT406, TC406, SCT306 Non-pressure Liquid Tank (MC306, TC306). Rear and side view of a non-pressure liquid tank trailer. Guide 131.
  • For flammable liquids (e.g., gasoline, diesel)
  • Elliptical cross-section
  • Rollover protection at the top
  • Bottom outlet valves
  • MAWP between 3-15 psi**
TC423 emulsion and water-gel explosives tank. Rear and side view of emulsion and water-gel explosives tank trailer. Guide 112.
  • For emulsions and water-gel explosives
  • Hopper-style configuration
  • MAWP between 5-15 psi**
DOT407, TC407, SCT307 Low Pressure Chemical Tank (MC307, TC307). Rear and side view of a low pressure chemical tank trailer. Guide 137.
  • For toxic, corrosive, and flammable liquids
  • Circular cross-section
  • May have external ring stiffeners
  • MAWP of at least 25 psi**
DOT412, TC412, SCT312 Corrosive Liquid Tank (MC312, TC312). Rear and side view of a corrosive liquid tank trailer. Guide 137.
  • Usually for corrosive liquids
  • Circular cross-section
  • External ring stiffeners
  • Tank diameter is relatively small
  • MAWP of at least 15 psi**
Compressed Gas/Tube Tailer. Rear and side view of a compressed gas tube trailer. Guide 117.
Mixed Cargo. Rear and side view of a mixed cargo trailer. Guide 111.
Dry Bulk Cargo Trailer. Rear and side view of a dry bulk cargo trailer. Guide 134.
Intermodal Tank. Side view of an intermodal tank. Guide 117.
Vacuum Loaded Tank. Rear and side view of a vacuum loaded tank trailer. Guide 137.

CAUTION: This chart depicts only the most general shapes of road trailers. Emergency response personnel must be aware that there are many variations of road trailers, not illustrated above, that are used for shipping chemical products. The suggested guides are for the most hazardous products that may be transported in these trailer types.

* The recommended guides should be considered as last resort if the material cannot be identified by any other means.

** MAWP: Maximum Allowable Working Pressure.

Date Modified: