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You are here: Home / Trailer DOT Codes

Trailer DOT Codes

MC-306 (DOT 406)
Non (low) Pressure Bulk Liquid Cargo Tank

  • MC 36 – Maximum operating pressure of up to 3 psi
  • DOT 406 – Maximum operating pressure of up to 4 psi
  • Oval or egg-shaped cross-section
  • Flat or nearly flat ends
  • Aluminum – primary material of construction
  • Usually multi-compartmented
  • Separate manhole for each compartment
  • Emergency shutoff-drivers side front
  • Rollover protection to prevent manholes from opening up on rollover
  • Average maximum capacity – 9,000 gallons

Contents:

  • Normally – Petroleum products, however, may be water or milk

MC-307 (DOT 407)
Low-pressure Bulk Liquid Cargo Tank

  • DOT 407 – Pressure – up to 40 psi @70°F
  • Horseshoe-shaped cross-section
  • Flat or slightly rounded ends
  • Stainless steel is primary material of construction
  • May be insulated. Insulation may hide tank shape – may not appear to be horseshoe-shaped
  • Manway usually center (top) of tank
  • Discharge valves usually center (bottom) of tank
  • If multi-compartmented, will have a separate manhole for each compartment
  • Emergency shutoff – drivers side front
  • Rollover protection to prevent manholes from opening up on rollover, normally center of tank top
  • Average maximum capacity – 6,000 gallons

Contents:

  • Normally – mild acids, however, water, milk or combustible liquids

MC-312 (DOT 412)
Corrosive Cargo Tank

  • DOT 412 – Pressure -5 to 25 psi Exterior strengthening (stiffer) rings often visible
  • Lined tank – usually lined with rubber or plastic
  • Round cross-section
  • Stainless steel is primary material of construction
  • May be insulated, insulation may hide tank shape
  • Manway usually rear (top) of tank
  • Discharge valves usually rear (bottom) of tank
  • If multi-compartmented, will have a separate manhole for each compartment
  • Emergency shutoff – drivers side front
  • Cigar shaped tank – long, small in diameter
  • Average maximum capacity – 4,000 to 6,000 gallons

Contents:

  • Corrosives
  • High weight (specific gravity) liquids

MC-331
Gases that are liquefied by pressure application only

  • Circular cross-section
  • Rounded ends
  • Single shell carbon steel construction
  • All valves, gauges, piping protected against damage from rollovers
  • Painted white for reflecting suns UV light rays
  • Pressure – 100 to 500 psi
  • Gases that are liquefied by pressure application
  • Capacity – from 2,500 gallons for bobtail to 11,500 gallons for highway transport truck

Contents:

  • Propane (LPG)
  • Butane
  • Chlorine
  • Anhydrous Ammonia

MC-338
Cryogenic Cargo Tank

  • Cryogenic liquids (DOT definition of cryogenic states that substance must be at least -130°F)
  • Cylindrical shaped with “box cabinet” on rear of tank, door for loading/unloading operations are usually within these doors
  • Thermos bottle design; 2 cylinders, cylinder-within-a-cylinder
  • Area between 2 cylinders evacuated of air (vacuum)
  • It is normal to see vapors escaping from the vent “stack” on rear cabinet area of container
  • Pressures from 23.5 to 500 psi – normally low pressure

Contents:

  • Substances which con not be liquefied by pressure application alone, these substances must be (super cooled) to become a liquid
  • Liquid oxygen, hydrogen, carbon dioxide

High-pressure Tube – Gasses that con not be liquefied with pressure application

  • Each tube is a separated container
  • Each tube is thermally protected with thermal plug that is designed to melt out under fire conditions to relieve internal pressure
  • Tubes are individually controlled in rear compartment
  • Off-loaded by “cascade style” (same method as used to fill SCBA bottles)
  • Pressures of 4,000 to 6,000 psi per tube
  • Usually 9 to 12 tubes per trailer
  • High-pressure tube rail cars are of the same design as these styles of highway cargo tanks

Contents:

  • Gases that can not be liquefied by only pressure application
  • Helium, nitrogen, argon

NEED HELP CHOOSING THE RIGHT TANK? CONTACT US AT: (800) 205-6871

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