Presentation on theme: "Hazardous Materials: Recognition and Identification"— Presentation transcript:
1 Hazardous Materials: Recognition and Identification Unit 2Hazardous Materials: Recognition and Identification
2 IntroductionFailure to recognize chemical hazards puts firefighters in severe dangerImmediate effects from some materialsMultiple exposures have far-reaching effectsHazardous materials incidents kill thousandsFour basic clues to recognition and identification:Location and occupancyPlacards, labels and markingsContainer typesSenses
3 Location and Occupancy In general, the more industrialized a community is, the more hazardous materials it containsBuildings that store hazardous materials:Hardware and auto parts storesHospitalsDry cleanersManufacturing facilities, print shopsDoctors’ offices, photo labs, agricultural supply storesEtc.
4 Placards, Labels, and Markings Many systems are used to mark hazardous materials containers, buildings, and transportResult from laws, regulations, and standardsBuilding Officials Conference Association (BOCA) codeAdopted as a regulation in local communitiesRequire use of the NFPA 704M marking system for certain occupancies
5 Figure This NFPA 704M symbol is used to warn of potential chemical dangers in the building. It warns of fire, health, reactivity, and special hazards.
6 PlacardsDepartment of Transportation (DOT) regulates movement of hazardous materialsRail, air, water, roadway, and pipelineShipper must placard a vehicle to warn of storage of chemicalsNine hazard classes that use more than 27 placards to identify a shipmentLabels are smaller versions of placards
7 Materials that Require Placarding at any Amount (DOT Table 1) HAZARD CLASS OR DIVISIONPLACARD TYPE1.1Explosives 1.11.2Explosives 1.21.3Explosives 1.32.3Poison gas4.3Dangerous when wet5.2 (Organic peroxide, type B, liquid or solid, temperature controlled)Organic peroxide6.1 (Inhalation hazard Zone A or B)Poison inhalation hazard7 (radioactive label III only)Radioactive
8 Materials that Require Placarding at 1,001 Pounds (DOT Table 2) CLASS OR DIVISIONPLACARD TYPE1.4Explosives 1.41.5Explosives 1.51.6Explosives 1.62.1Flammable gas2.2Nonflammable gas3 Flammable liquidFlammable3 Combustible liquidCombustible4.1Flammable solid4.2Spontaneously combustible5.1Oxidizer5.2 (Other than organic peroxide)Organic peroxide6.1 (Other than inhalation)Poison6.1 (PG III)Keep away from food8Corrosive9Class 9
9 PlacardsDOT - 49 CFRDOT system uses nine hazard classifications with more than 27 placards.DOT also requires United Nations/North America (UN/NA) identification number.
10 Class 1, Explosives Division 1.1 Division 1.2 Division 1.3
11 Class 2, Gases Division 2.1 Division 2.2 Division 2.3 Hazard Zone A Hazard Zone BHazard Zone CHazard Zone D
12 Class 3, Flammable Liquids Flash point less than 141 degrees F.Combustible liquids are those with flash points between degrees F.
13 Class 4, Flammable Solids Division 4.1Division 4.2Division 4.3
14 Class 5, Oxidizers and Organic Peroxides Division 5.1Division 5.2Type AType BType CType DType EType FType G
15 Type 6, Poisonous Materials Division 6.1Division 6.2Hazardous Zone AHazardous Zone B
16 Class 7, Radioactive Materials Materials determined to have radioactivity at certain levelsRadioactive IRadioactive IIRadioactive III
17 Class 8, Corrosives Acids Bases Visible destruction in skin or corrodes steel or aluminum
18 Class 9, Miscellaneous Hazardous Catchall category
20 Placards (cont’d.) Problems with the placarding system Relies on a human:To determine extent of loadTo determine appropriate hazard classesTo interpret difficult regulations to determine if placard requiredPlacard must be affixed to all four sides of a vehicleOnly required for shipments that exceed 1,001 poundsTen to twenty percent of trucks not placarded correctly
21 Labels Package markings must include: Shipping name of the materialUN/NA identification numberShipping and receiving companies’ names, addressesPackages containing more than a Reportable Quantity (RQ) of material must be markedPackages listed as ORM-D materials should be marked as suchLabels identical to placards other than size
22 Other Identification Systems Several other identification systems used in private industry to mark facilities and containersMilitary shipments and pipelines are also markedWarnings are a clue to potential presence of hazardous materials
23 NFPA 704 System Designed for buildings, not transportation Alerts first responders to potential hazardsTriangular sign divided into four areasHealth hazard: blueFire hazard: redReactivity hazard: yellowSpecial hazards: whiteRanking from zero to fourZero presents no risk
25 Hazardous Materials Information System HMIS designed to comply with federal hazard communication regulationHMIS can be developed by the facility or manufacturer of the labelsOne system may vary from anotherColors and numbers usually same as NFPAPicture of required PPE for each substance may be provided
27 Military Warning System Military uses DOT placarding system when possibleAssume military is aware of incident involving extremely hazardous materialsHigher hazards more likely to be shipment escortDriver of the truck may not be allowed to leave the cab of the truckNotify military if driver and escort crew killed or seriously injured
29 Pipeline MarkingsPipeline owner is required to place sign if underground pipeline crosses mode of transportationSign must contain a warning, hazardous contents of pipe, owner’s name and phonePipeline buried a minimum of three feetProduct can vary from liquefied gases and petroleum products to slurried materialPipeline companies required to provide training and tours for emergency responders
30 Container Markings Most containers marked with contents Cylinders have name of product stenciled on side of the cylinderBulk container has product stenciled on the sideTrucks that are dedicated haulers also stencil product name on two sides of vehicle
31 Pesticide Container Markings Pesticides regulated by the EPA in terms of markingsLabel has manufacturer’s name; no information about chemical make-upIf label indicates “Danger,” extreme caution should be taken“Warning” and “Caution” present lesser hazards
32 Radiation Source Labeling New warning label issued by the IAEA in 2007DOT still requires DOT labels and placardsResponders should request assistance of radiation specialistsFigure “IAEA Radiation” label.
33 ContainersHazardous materials come in containers of many shapes and sizesType of material and end use for product determine packagingHousehold version usually different than industrialFirst responders should be alert for anything unusualExample: 55-gallon drum in a bedroom along with laboratory glassware
34 Figure The type of container can provide some clues as to the contents of the container. Because this drum is reinforced, it has a high likelihood of containing an extremely hazardous material.
35 General Most general containers for household use Carried in large quantities when transportedCardboard boxes ship hazardous materialsChemicals shipped in glass bottles usually insulated and packed in cardboard boxesOne-gallon glass bottles transported in carboysGlass bottles may be coated in plasticBags may carry anything from food items to poisons
36 General (cont’d.) Drum construction gives clue as to contents Cylinders hazardous because of contents and pressureRelief valves mandated in the U.S.Totes and tanks have capacities between 119 and 793 gallonsHold flammable, combustible, toxic, and corrosive materialsTransported on flatbed or box-type trailersCommon incident during offloading
37 Figure The most common type of spill occurs when a valve is knocked off, releasing the contents.
38 Pipelines Sized between ½ inch and more than six feet Commonly buried undergroundSome type of pipeline system is found in every stateLarger pipelines along east coast and in AlaskaAmount in pipeline varies; must have contact information for pipeline ownerIf incident suspected, contact pipeline owner immediately
39 Radioactive Material Containers Transport of radioactive materials regulated by DOT and Nuclear Regulatory Agency (NRC)Strong, tight container: for low-level radioactive materialExcepted packaging: for materials that have low specific activityType A container: for materials with higher radiationType B container: must have ten inches of lead shielding
40 Highway Transportation Containers Tractor trailer can carry variety of hazardous materials and portable containersDetermining contents may be difficultUse extra care with refrigerated materialsSpecification plates list information about tankFour basic types of tank trucks:DOT-406/MC-306 gasoline tank truckDOT-407/MC-307 chemical haulerDOT-412/MC-312 corrosive tankerMC-331 pressurized tanker
41 Boiling Liquid Expanding Vapor Explosion (BLEVE) Heat inside container causes material to boil and vapors to expandPressure inside container causes the tank to failWithdraw immediately if rising sound from relief valve or discoloration of tankFire must be fought from a distance with unmanned hose holders
43 Dangers Associated with BLEVE Fireball can engulf responders and exposuresMetal debris can fly considerable distancesLiquid propane can be released and igniteThe shock wave, air blast, or flying metal created by the BLEVE can collapse buildings or move responders and equipment
44 Dangers Associated with BLEVE (cont’d.) Firefighters should withdraw immediately in the case of rising sound from a venting relief valve or discoloration of the tankFire must be fought from a distance with unmanned monitors or hoses that are cooling the tank with a minimum of 500 GPMIf water is vaporizing on contact, apply more waterAvoid icing around the relief valves
45 Dangers Associated with BLEVE (cont’d.) Any tank that is exposed can fail at any time and in any directionIf unmanned monitors are unavailable, firefighters should withdraw and let the fire burn45
46 Specialized Tank Trucks Gases are liquefied and transported as with MC-331 tank trucks, refrigerated or compressedDry bulk trucks carry variety of productsMaterials requiring high temperatures transported in special vehiclesIntermodal tanks similar to full size highway tanksCan be used on ships, railways, or highways
47 Figure These trucks carry molten products and can be heating the product while driving. This practice is illegal but is found on occasion. The fuels used to heat the product are either diesel/kerosene or propane.
48 Rail TransportationRail incidents involve multiple cars, in rural areas and multiple agenciesThree basic types: non-pressurized, pressurized, specializedDedicated railcars marked with the contentsNon-pressurized cars have relief valve outside of expansion domePressurized cars have valves, pipes under a protective housing
49 Rail Transportation (cont’d.) Specialized railcars have same characteristics as highway vehiclesHighway box trailers often loaded onto railcarsRailroads use same placarding systemMore extensive information, printed largerSome railcars may be painted in a configuration to identify hazardous loads
51 Bulk Storage TanksMovement to remove underground storage tanks (UST) and replace with above ground storage tanks (AST)Inspection wells surround UST and detect leaksTwo types of AST: upright and horizontalVapors may accumulate in ordinary upright ASTFloaters prevent vapor accumulationSpecialized tanks have external cover appears to be a tank within a tank
52 Figure 25-79 This is a cone roof tank Figure This is a cone roof tank. It has a weak roof-to-shell seam so that in the event of an explosion the roof will come off, but the tank should remain intact.
53 Figure This is an open floating roof tank, in which the roof floats on top of the product. This reduces the release of vapors, as there is no vapor space, and reduces the fire potential.Figure This is a covered floating roof tank, which is the same as an open floating roof tank but has a cover to keep out snow, rain, and debris. Another term for this type of tank is geodesic domed tank.
54 Figure The specialized tank such as the propane tank shown here has some of the same properties as its transportation equivalents.
55 Senses Never smell, taste, or touch to identify materials Use information from exposed individuals only after decontaminationCan use hearing and visionExample: pitch of relief valve increases indicates pressure increasingMany chemicals are desensitizersMany severely toxic materials are colorless and odorless
56 Chemical and Physical Properties As firefighter progresses through response levels, need for additional chemistry increasesFirefighter should consult with hazardous materials team or other resourcesBasis of fire is a chemical reactionThe better that firefighters understand chemical reactions, the better off they will be
57 Containers and Properties When chemicals release, knowing how materials react is importantLower boiling point means more pressure in container in a fireCorrosives placed in wrong container cause container to failGood chance venting or rupture will be violentLower flash point means greater fire risk
58 Radiation Atom comprised of electrons, neutrons, and protons Protons and neutrons in the nucleus of the atomElectrons orbit the nucleusProtons have positive charge, determine elementNeutrons are the same size as protons, but neutralIsotopes: forms of an element, determined by the number of neutrons
59 Radiation (cont’d.) Radioisotopes: isotopes whose nuclei are unstable Emit radiation to become more stableIf atom emits an alpha or beta particle, number of protons changes, becomes different elementUranium is base for radon, which decays into leadHalf-life: amount of time for half of a radioactive source to decayActivity: number of decays per second
60 Types of RadiationNon-ionizing radiation: radio waves, microwaves, infrared, visible lightIonizing: alpha, beta, gamma and x-raysEnergy and weight: particulates such as alpha, betaJust energy: gammaAlpha: two neutrons, two protonsBeta: electrons and positronsMoves farther in air and causes more damage
61 Types of Radiation (cont’d.) Gamma: comes from energy changes in the nucleus of the atomNeutron: not common, but used in nuclear powerNeutrons ejected from nucleus during fissionNeutron radiation transfers its energy to waterHuman body 68 – 75 percent waterNeutron radiation activates non-radioactive isotopesMaterials in nuclear reactor become radioactiveX-rays comparable to gamma radiation
62 Figure 25-92 Examples of risks for ionizing radiation.
63 Toxic Products of Combustion Firefighters suffer considerable chemical exposuresBreathing smoke bombards body with toxic chemicalsMany toxic chemicals produced in a fireHouse, car, and dumpster fires are worst type of chemical accidentBrush fires may have pesticides, herbicides or otherWear all protective clothing, especially SCBA
64 Lessons LearnedAt any incident, there is always a factor that relates to identification of hazardous materialsKnow where to access hazardous materials informationMaterials with high vapor pressures present great riskUnderstanding the harms from radiation is an important safety considerationLocal hazardous materials responders a good source of information
Your consent to our cookies if you continue to use this website.