The Federal Motor Carrier Safety Administration (FMCSA) will maintain its permitting stance on the transportation of anhydrous ammonia domestically, according to Paul Bomgardner, chief of FMCSA’s Hazardous Materials Division.

 

For anhydrous ammonia in domestic transportation and described as UN1005 ammonia, anhydrous 2.2 Inhalation Hazard, a Hazardous Materials Safety Permit (HMSP) is not required.

 

For anhydrous ammonia described as UN1005, ammonia, anhydrous 2.3 Poison Inhalation Hazard or Toxic Inhalation Hazard, Zone D, and when transported in a packaging having a capacity greater than 3,500 gallons, an HMSP is required. In these instances, anhydrous ammonia meets the definition of a material that is Poison-By-Inhalation or Toxic-By-Inhalation as defined in 49 CFR 171.8 and meets the criteria for a hazard Zone D as specified in 49 CFR 173.116(a).

 

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