Nine US DOT Hazard Classes


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An easy way to memorize the Nine DOT Placards that are placed when offered into commerce. For CHMM Overview class that was held on April 5, 2013 at XENCO Laboratories in Stafford, TX.

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  • For nOn-FLAMMABLE gAS, OxygEn (compressed gas or refrigerated liquid), and FLAMMABLE gAS, placard 454 kg (1,001 lbs) or more gross weight. For POISOn gAS (Division 2.3), placard any quantity.
  • For FLAMMABLE, placard 454 kg (1,001 lbs) or more. gASOLInE may be used in place of FLAMMABLE placard displayed on a cargo tank or portable tank transporting gasoline by highway. Placard combustible liquid transported in bulk. See §172.504(f)(2) for use of FLAMMABLE placard in place of COMBuStIBLE. FuEL OIL may be used in place of COMBuStIBLE on a cargo or portable tank transporting fuel oil not classed as a flammable liquid by highway.
  • For FLAMMABLE SOLID and SPOntAnEOuSLy COMBuStIBLE, placard 454 kg (1,001 lbs) or more. For DAngEROuS WHEn WEt (Division 4.3), placard any quantity.
  • For OxIDIZER and ORgAnIC PEROxIDE (other than tyPE B, temperature controlled), placard 454 kg (1,001 lbs) or more. For ORgAnIC PEROxIDE (Division 5.2), type B, temperature controlled, placard any quantity.
  • For Regulated Medical Waste (RMW), an Infectious Substance label is not required on an outer packaging if the OSHA Biohazard marking is used as prescribed in 29 CFR 1910.1030(g). CDC Etiologic Agent label must be used as prescribed in 42 CFR 72.3 and 72.6. A bulk package of RMW must display a BIOHAZARD marking. For POISOn (Pgl or PgII, other than inhalation hazard) and POISOn (PgIII), placard 454 kg (1,001 lbs) or more. For POISOn-InHALAtIOn HAZARD (Division 6.1), inhalation hazard only, placard any quantity.
  • Placard any quantity - packages bearing RADIOACtIVE yELLOW-III labels only. Certain low specific activity radioactive materials in “exclusive use” will not bear the label, but the radioactive placard is required for exclusive use shipments of low specific activity material and surface contaminated objects transported in accordance with §172.504(e) table 1 and §173.427(a)(6).
  • For CORROSIVE, placard 454 kg (1,001 lbs) or more.
  • not required for domestic transportation. A bulk packaging containing a Class 9 material must be marked with the appropriate ID number displayed on a Class 9 placard, an orange panel, or a white square-on-point display
  • Use these Blank Limited Quantity labels when shipping limited quantities of dangerous goods by ground or water after 1/1/11. The labels including the "Y" symbol must be used when shipping limited quantities by air.
  • These dead tree, dead fish markings are part of the Globally Harmonized System (GHS) and were incorporated into the 14th edition of the United Nations Model Regulations. The eye-catching illustrations of a dead tree, dead fish provide a visible concept of how contaminants from solid waste enter the soil and ground water systems.
  • Nine US DOT Hazard Classes

    1. 1. Nine DOT Hazard ClassesAcronym To Help MemorizeAlbert V. Condello III CHMMUniversity of Houston Downtown
    2. 2. Introduction There are nine (9) hazard classes that DOT requireswhen placarding a vehicle as well as labeling thecontainer. We will discuss an easy way to memorize those ninehazard classes in the correct order. Remember, there might be a need to placard withmore than one if the HMT requires the secondaryhazard to also be noted.
    3. 3. DOT Chart 15 Refer to Hand Out 2012 Emergency Response Guidebook(Page 4) Hazard Classification System
    4. 4. Nine DOT Hazard ClassesExplosives Class 1Flammable/CombustibleGases Class 2Flammable/CombustibleLiquids Class 3FlammableSolids/DangerousWhen Wet Class 4Oxidizers/OrganicPeroxides Class 5Toxic/InfectionSubstances Class 6Radioactive MaterialsClass 7Corrosives Class 8Other RegulatedMaterials (ORM) Class9
    5. 5. AcronymEvery Good Fire Fighter Ought To Receive CashMoneyRemember these nine (9) phases, they will help youto know what is the DOT Hazard Classes in thecorrect order.
    6. 6. EveryClass 1 - ExplosivesDivision 1.1 Explosives with a mass explosion hazardDivision 1.2 Explosives with a projection hazardDivision 1.3 Explosives with predominantly a fire hazardDivision 1.4 Explosives with no significant blast hazardDivision 1.5 Very insensitive explosives with a massexplosion hazardDivision 1.6 Extremely insensitive articles
    7. 7. GoodClass 2 - GasesDivision 2.1 Flammable gasesDivision 2.2 Non-flammable, non-toxic* gasesDivision 2.3 Toxic* gases§172.528 ,§172.530, §172.532, §172.540
    8. 8. FireClass 3 - Flammable liquids (andCombustible liquids [U.S.])§172.542, §172.544
    9. 9. FighterClass 4 - Flammable solids; Spontaneouslycombustible materials; and Dangerous when wetmaterials/Water-reactive substancesDivision 4.1 Flammable solidsDivision 4.2 Spontaneously combustible materialsDivision 4.3 Water-reactive substances/Dangerouswhen wet materials§172.546, §172.547, §172.548
    10. 10. OughtClass 5 - Oxidizing substances and OrganicperoxidesDivision 5.1 Oxidizing substancesDivision 5.2 Organic peroxides§172.550, §172.552
    11. 11. ToClass 6 – Poison (Toxic) substances andInfectious substances & PoisonousInhalation HazardsDivision 6.1 Toxic substancesDivision 6.2 Infectious substances§172.504(f)(10), §172.554, §172.555
    12. 12. ReceiveClass 7 - Radioactive materials§172.556
    13. 13. CashClass 8 - Corrosive substances§172.558
    14. 14. MoneyClass 9 - Miscellaneous hazardousmaterials/Products, Substances orOrganismsA/k/a (ORM) Otherwise Regulated Materials§172.560
    15. 15. QuestionHOW MANY DIVISIONS PER GROUPS OFPLACARDS ?Answer: 6,3,2,3,2,2 (Class 1 thru 6)Proof: 6 (Class 1) 3(Class 2) 2(Class 3) 3(Class 4) 2(Class 5) 2(Class 6)
    16. 16. Dangerous Placard §172.521A freight container, unit load device, transportvehicle, or rail car which contains non-bulkpackages with two or more categories ofhazardous materials that require different placardsspecified in table 2 §172.504(e) may beplacarded with Dangerous placards insteadof the specific placards required for each of thematerials in table 2. However, when 1,000 kg(2,205 lbs) or more of one category of materialis loaded at one loading facility, the placardspecified in table 2 must be applied.
    17. 17. Limited Qty§172.315(a)(2)(Vessel transport only)When shipping by air
    18. 18. Environmental Pollutant These EnvironmentallyHazardous SubstanceMarkings are designed tohelp shippers andtransporters easily identifyany liquid or solid material,including its mixtures andsolutions that are classifiedas marine pollutants.
    19. 19. For Further InfoPlease feel free to contactAlbert V. Condello III CHMMProfessor – Safety & Fire ProtectionEngineeringUniversity of Houston DowntownEmail: Condelloa@uhd.eduCell 979-412-2219