Ask X3What does 49 CFR 173.243 (Bulk packaging for certain high hazard liquids and dual hazard materials which pose a moderate hazard) require?
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Based on 49 CFR 173.243, when the hazardous materials table (§ 172.101) specifies that a material must be packaged under this section, you are only authorized to use specific bulk packagings (subject to subparts A and B of part 173 and column 7 special provisions).
As a motor-carrier owner, the practical requirements include:
* Authorized Bulk Packagings: You must use only the authorized rail cars, cargo tanks, portable tanks, or intermediate bulk containers (IBCs) listed in the regulation for the specific material being transported.
* Cargo Tank Specifications & Design Pressure: Authorized cargo tank motor vehicles include Specification MC 304, MC 307, MC 330, and MC 331, as well as MC 310, MC 311, MC 312, DOT 407, and DOT 412 cargo tanks that have a tank design pressure of at least 172.4 kPa (25 psig).
* Special Requirements for Certain Cargo Tanks: If you are transporting Class 3, Division 6.1, or Class 8 (Packing Group I or II) materials in cargo tanks, you must meet specific standards for:
* Pressure Relief Systems: Cargo tanks must be equipped with a compliant pressure relief system (such as those meeting § 178.346-3, § 178.347-4, or § 178.337-9 depending on the cargo tank model).
* Bottom Outlets: Cargo tanks must be equipped with proper stop-valves. For example, DOT 407 and DOT 412 tanks need stop-valves meeting § 178.345-11; MC 304, MC 307, MC 310, MC 311, and MC 312 tanks require stop-valves that can be remotely closed within 30 seconds (and thermal closure for certain classes); and MC 330 and MC 331 tanks require internal self-closing stop-valves.
* IBC Restrictions: If using IBCs, they must match the authorized IBC packaging code and Packing Group performance level. However, IBCs may not be used for Packing Group I liquids or Packing Group I solids that may become liquid during transport. Certain wooden, fiberboard, flexible, and composite IBCs are also prohibited for Packing Group II and III solids that may become liquid during transport.
* Rail Car Retrofits (if applicable): If your fleet includes rail operations, DOT Specification 111 tank cars and those built to the CPC-1232 standard are generally no longer authorized for transporting Class 3 flammable liquids unless properly retrofitted to DOT-117R or DOT-117P standards by the specified deadlines.