Presentation on theme: "Chemical Reactivity and Storage"— Presentation transcript:
1Chemical Reactivity and Storage Presented by QBELoss Control ServicesThis presentation addresses issues related improperly stored chemicals. Many chemicals are incompatible and precautions need to be taken to ensure they cannot come into contact.
2ObjectivesTo understand basic terminology relating to chemical hazard classes and reactivityTo be able to identify chemicals that pose a high potential risk for property loss or injuryTo be able to identify common incompatible chemicals that might be stored togetherAs QBE’s appetite for manufacturing business increases, there will be more potential exposure to losses relating to chemical hazards. We need to evaluate how these chemicals are stored and used during our risk evaluation.
3Pretest What are the 4 principles for good chemical storage? Match the following chemicals to the appropriate reactivity hazard:___Peroxides A- Air Sensitive___Acrylic Resins B- Spontaneous Peroxide Formation___Metal Dusts C- Strong Oxidizers___Ethers D- Polymerization Hazard___Hydrogen E- ReducerExplain why intentional chemistry processes are a major concern from a potential loss standpoint.List 10 things that should be reviewed when evaluating chemical storage areas.
4Former Ammonium Nitrate Plant Improper chemical use and storage can lead to catastrophic consequences.
5Potential Losses Relating to Chemicals PropertyFireExplosionsEnvironmental ReleaseWorkers CompensationRespiratory DiseaseDermatitisChemical BurnsPhysical InjuriesGeneral LiabilityLosses related to chemical use and storage can affect property, work comp and general liability coverages. Chemicals need to be evaluated as they relate to all of these coverages in the loss control survey.
6Use of Chemicals Manufacturing Processes Distributors Warehouses Chemical Product ManufacturePaint ManufacturePlatingMetal Heat TreatingMetal CleaningMetal DegreasingPrintingPlasticsConcrete AdditivesFood AdditivesAdhesivesCircuit BoardsDistributorsWarehousesStoresAncillary ActivitiesPaintingWaste TreatmentWater TreatmentSanitation/JanitorialLaboratoriesPest ControlSwimming PoolsFertilizersLawn/garden ChemicalsAmmonia RefrigerationThese are some of the types of operations insured by GC where chemicals are used or stored. Chemicals are used in a wide variety of manufacturing processes. Chemical products can be made from other chemical raw materials by chemical reaction. An example is a hydrated lime plant where limestone (calcium carbonate) is heated and reacted with water to form hydrated lime (calcium hydroxide). The chemical reaction is as follows:CaCO3 + Heat CaO + CO2CaO + H2O Ca(OH)2Chemical are also used in certain processes within an operation and are unchanged by the process (metal degreasing). Chemical such as paints, fertilizers, pesticides and herbicides may be stored and distributed by store chains. Chemical are also used in special circumstances such as sanitation at a food processor or to treat the waste stream leaving a facility.
7Terminology Oxidizer Polymerization Reducer Pyrophoric Alkali Acid ExplosivesReactiveThere are a number of specialized chemical terms that loss control staff need to be familiar with.Oxidizer- Chemicals that supply oxygen or chlorine that accelerates combustion of other materials. The reaction can be spontaneous or may occur under slight heating. Oxidizers are severe fire and explosion hazards.Polymerization- Chemicals that have a tendency to self-react to form larger molecules. They may generate heat during this self reaction causing containers to burst and materials to ignite.Reducer- Chemicals that are the opposite of oxidizers. These chemicals want to gain oxygen in a chemical reaction.Pyrophoric- Chemicals that ignite spontaneously when exposed to air.Alkali- Bases. Corrosive chemicals with a pH greater than 7.Acid- Corrosive materials with a pH less than 7.Explosives- Materials that under conditions of shock, temperature or chemical reaction decompose violently releasing large amounts of gas and heat.Reactive- Chemicals that are unstable, explosive, water reactive, air sensitive, oxidizing or reducing. These chemicals have a tendency to readily combine chemically with other materials releasing heat, toxic vapors and gases.
8Basic Chemistry Oxidizers want to gain electrons to be more stable Reducers want to lose electrons to be more stableThe stronger the oxidizer, the more it wants to gain electronsThe stronger the reducer, the more it wants to lose electronsMost chemical reactions we are concerned with involve oxidation of one chemical in conjunction with reduction of the other chemical at the same time. Chemical reactions involve the transfer of electrons from one atom to another. A strong oxidizer has a very high affinity for these electrons to make them more stable. Reducers on the other hand want to readily give up electrons to make them more stable. When these two types of compounds are mixed, this transfer of electrons is very rapid releasing large amounts of heat and energy. This heat and energy can cause fires and explosions.
10Strong Oxidizers Fluorine Nitrates Chlorine Nitrites Ozone PersulfatesPeroxidesPerchloratesDichromatesChromatesPermanganatesHypochloritesNitratesNitritesLiquid oxygenChloratesThis is a list of some of the more common strong oxidizers. There are others. If there are questions about a particular chemical consult the MSDS.
11Reducers Finely divided metals Hydrazine Hydrides Hydrogen Aniline SodiumLithiumPotassiumThese are some common reducers. There are others. Check the MSDS is there is uncertainty in regards to a particular chemical that may be a reducer.
12Chemical State Solid Liquid Gas Chemical state is important in regards to the hazard of a particular chemical.Gases are usually the greatest concern because if they leak they quickly move over large areas. Gases are also readily absorbed into the bloodstream through the thin membranes in the lung.Liquids are usually the next most hazardous form of chemicals. They flow easily over a surface and make contact an ignition source causing a fire if they are flammable.Solids are usually the least hazardous form of a chemical. They remain in a set location and are more easily contained and cleaned up.
13Scale of Chemical UseWhen evaluating chemical risks the amount of chemicals is one of the most critical pieces of information. In this case small quantities- gallons, few ounces are used in a research lab.
14Scale of Chemical UseIn this case hundreds of gallons of chemicals are used and stored at a printing operation.
15Chemical Reaction Equipment The scale of chemical reaction equipment is important. This picture shows a small chemical reactor in a laboratory.
16Scale of Chemical UseThis picture shows large tanks of chemicals used in a plating process.
17Other Storage IssuesWhen evaluating chemical storage don’t forget about containment, ignition sources, bonding, grounding, fire protection, etc.
18Other Safety Equipment Eyewash stations, showers and fire extinguishers should be in place where chemicals are used and stored.
19Flammables Not addressed in this presentation Store according to NFPA and QBE property guidelinesThis presentation will focus on chemical reactivity hazards. Loss control staff should be familiar with storage and use of flammable materials. These topics have been covered in previous property training. Consult the flammable solvents and property training PowerPoints for additional information.
20Water Reactive Chemicals Alkali metals (lithium, sodium, magnesium)Hydrides (diborane, sodium hydride)Peroxides (sodium peroxide)Carbides (calcium carbide)Oxides (sodium oxide)Phosphides (aluminum phosphide)Anhydrides (acetic anhydride)These are some of the more common water reactive chemicals. Some react slowly when wet. Others may react violently. Humidity in the air may also cause reaction. Water reactive chemicals typically decompose water molecules (H2O) creating free hydrogen. Hydrogen gas is highly explosive.
21Polymerizable Chemicals Chemical chain reaction of monomers to form polymersMay self reactMay react vigorously with waterMay give off hazardous gasesMay cause high pressure in storage containerInhibitors are used to prevent reactionPolymerizable chemicals have a tendency to self react. When they self react energy is released. If this energy is not dissipated as fast it is generated, it can preheat the unreacted material increasing the acceleration of the chemical reaction until it is out of control causing fires and explosions.
22Polymerizable Chemicals Acrylic acidAcrylonitrileEthyl acrylateMethyl acrylateMethacrylic acidVinyl acetateThese are some common materials susceptible to polymerization.
23Unstable/Shock Sensitive Chemicals Very unstableReact vigorouslyMechanical shock, elevated temperature or pressures can cause reactionUnstable compounds have a tendency to break down (decompose) over time or when subject to heat, sunlight, shock, friction or a catalyst with resulting decomposition products being toxic or flammable. Decomposition can be rapid enough to cause explosive energy release causing fires and explosion.
24Unstable/Shock Sensitive Chemicals Ammonium perchlorateAzo, diazo or azide chemicalsFulminatesHydrogen peroxideOrganic peroxidesNitro or nitroso compoundsPicric acidPerchloric acidTriazinesThese are some common unstable chemicals.
25Air-Sensitive Compounds Reactive with oxygen in airUsually pyrophoricUsually stored under inert gas or liquidAir-sensitive compounds readily reactive with oxygen in the atmosphere, igniting and burning without an ignition source. Pyrophoric materials ignite spontaneously on short exposure to air.
26Air-Sensitive Compounds Metalic dusts (zinc, nickel, titanium)Alkali metals (potassium, sodium, magnesium)Hydrides (diborane, barium hydride)This is a list of common chemicals and materials that are sensitive to air.
27Organic PeroxidesCompounds having two oxygen atoms joined together (peroxy)Severe fire and explosion hazardBurn rapidly and intenselyMay be strong oxidizersPlastics and rubber industriesUsed as accelerators, activators, catalysts, curing agents, hardeners, initiators or promotersSolids liquids and pastesCan be formed spontaneouslyPeroxides are unstable materials because they contain excess oxygen. The oxygen to oxygen bond in peroxides is unstable and very energetic. When exposed to heat, fire, shock, friction or contamination the oxygen bond cleaves to form reactive oxygen free radicals that are available to recombine with other chemicals causing violent reactions.
28Organic Peroxides Methyl ethyl ketone peroxide Benzol peroxide Hydrogen peroxidePeracetic acidThere are many other peroxidesThis is a list of some common peroxides. Methyl ethyl ketone peroxide is one of the more common peroxides. It is used for in place polymerization of reinforced plastics and fiberglass. Other peroxides are used as bactericides, fungicides, and bleaching agents.
29Spontaneous Peroxide Formation Some chemicals can form peroxides during storageLight and heat can cause peroxide formationProlonged storage of susceptible chemicalsSpontaneous formation of peroxides can occur due to reaction of some substances with atmospheric oxygen. Peroxide formation occurs slowly over time when a peroxide forming liquid is stored with limited access to air. Inhibitors and stabilizers are often added to these liquids to prevent peroxide formation. The friction of opening the chemical container or sudden shock or agitation of the container can cause explosive decomposition of the peroxide.
30Spontaneous Peroxide Formation EthersTetrahydrofuranp-Dioxane2-Propanol2-ButanolMethyl isobutyl ketoneStyreneVinyl acetateThese are some common solvents that have the potential for peroxide formation during prolonged storage. There are many others. Check the MSDS if there is a question about peroxide formation.
31NFPA StandardsNFPA 430- Code for Storage of Liquid and Solid OxidizersNFPA 432- Code for Storage of Organic Peroxide FormulationsNFPA 484- Code for Combustible Metals, Metal Powders and Metal DustsNFPA 490- Code for Storage of Ammonium NitrateNFPA 495- Explosive Materials CodeThere are a number of NFPA codes that address storage requirements for some classes of chemicals. These should be consulted for specific storage requirements.
32Swimming Pool Chemicals Strong oxidizers3.8 million swimming pools in U.S.Kill bacteria, fungi, viruses by releasing chlorineThere are a couple of special chemical storage and handling issues we need to pay close attention to. The first are chemicals associated with maintenance and sanitation of swimming pools. Motels and apartment complexes that we insure may have swimming pools. Swimming pool water treatment chemicals can become hazards when they become wet or if they are mixed improperly. These chemicals can also be self reactive over time. Each year there are numerous incidents relating to exposure to toxic chemicals and fire caused by pool chemicals
33Swimming Pool Chemicals InorganicCalcium hypochlorite (Cal hypo)Lithium hypochloriteSodium hypochlorite (bleach)Chlorine gas (large pools)OrganicTrichloroisocyanuric acid (Trichlor)Potassium dichloroisocyanurate (Dichlor)Sodium dichloroisocyanurate (Dichlor)Sodium dichloroisocyanurate dihydrate (Dichlor)Brominated HydantoinThe most common pool disinfectant is calcium hydroxide or Cal Hypo. These chemicals are oxidizers which release chlorine that kills algae, bacteria and fungi. Sodium hypochlorite in diluted form is household bleach. Isocyanurates form cyanuric an hypochlorous acid in water solutions. Trichloroisocyanuric acid is the most common isocyanurate disinfectant.These chemicals are unstable and react with water if accidentally wetted during storage. These chemicals also are incompatible with many other chemicals such as ammonia, gasoline, paints, solvents and pesticides.
34Swimming Pool Chemicals Cal hypo + Chlorinated Isocyanurate + Water = Chlorine GasCal hypo is a strong oxidizer. When mixed with an isocyanurate like Trichlor and water they react explosively and highly toxic chlorine gas is produced.
35Swimming Pool Chemical Storage SecureArea should be posted with signsWell ventilatedAway from sunlightDryStore in original labeled containersStore away from acidsSpills should be cleaned up immediately according to manufacturer’s proceduresSwimming pool chemicals need to be stored in a secure area with access limited to authorized employees who are trained to use the materials properly. The storage area should be cool and dry and well ventilated and preferably in a detached location. Areas should be posted with signs identifying the major hazards of the chemicals stored in the area. Smoking should be prohibited in the storage area and the area should be clean and good housekeeping practices should be in place. Other chemicals like paints, solvents soaps, oils, etc. should not be stored in the same area as pool chemicals. If chlorine gas is used, cylinders should be upright and secure to prevent tipping with valve caps on. Pool chemicals should not be stored in basements or near elevator shafts, ventilation systems or other openings that might spread gases through the building if a leak occurs. Spilled chemicals should never be returned to the original container. Employees who apply pool chemicals should be properly trained so that they know how to apply the chemicals safely, using proper mixing and application techniques, dosage, and personal protective equipment.
36Laboratories Small quantities of chemicals Wide variety of chemicals Usually highly trained and employeesMany QBE accounts have laboratories. These may be QC laboratories in food processing plants or materials testing labs in manufacturing plants. Some accounts are laboratory type facilities where small amounts of special formulation products are manufactured. Chemicals are used in smaller quantities than in a manufacturing setting but there may be a wide variety of chemicals from various incompatibility classes stored at the facilities. This may pose a problem from an incompatibility storage standpoint.
37Chemical Reactivity Risk Evaluation This flow chart provides a simple way of determining whether there is a possibility of potential chemical reactivity hazards at an account. The flow chart is broken down in the next few slides.
38Go to Question 5Intentional chemistry is defined as a process where a chemical reaction is intended to take place. Intentional chemistry produces products that are chemically different than the starting materials. Operations that involve chemical reactions are at increased risk for negative consequences if there is a problem. These might include run away reactions, equipment under pressure as gases are produced by the reaction, venting of toxins, or heat generation. Loss control reports need to include specific information about chemical processes including raw materials used, equipment used to carry out the chemical reaction and controls used to prevent fires, explosions, and release of toxic materials.Many operations involve chemicals but there are no chemical reactions taking place. These include things like using solvents to clean parts, oils and machining fluids that are used to lubricate parts and equipment or pesticides used at a facility.
39Indicators of Intentional Chemistry Products have different chemical formulas than the starting materialsGases are given offSolid is formed from liquid or gaseous starting materialsA catalyst or initiator is usedHeat is generated or must be added to the processThese items are indicators that a chemical reaction is taking place. If there is a question about a particular process, contact the plant engineer, chemist or other technical specialist at the facility. Human resource personal and other loss control contacts may not understand the process themselves.
40Problems with Intentional Chemistry Wrong materials addedImproper amounts of materials addedInadequate cleaning of equipmentMaterials added in wrong sequenceMaterials added to fast or too slowContaminated feed materialsImproper temperature of feed materialsAir leaksInsufficient agitationHeat transfer inadequateOff-gas vent blocked or not openIntentional chemistry poses a high risk for losses due to these types of things that can go wrong. As an example- If a pump fails that provides cooling water to a chemical reaction vessel that heats up during a manufacturing process, the vessel may explode if a runaway reaction occurs. There are many other things that can lead to negative consequences not listed here. The account should have evaluated potential problems by performing a job hazard analysis or another hazard evaluation procedure.
41Chemical Reaction Vessel This is a small chemical reaction vessel used in a laboratory.
42Go to Question 6Even if intentional chemistry is not performed, mixing of chemical materials could pose a risk for losses if the wrong materials are accidentally mixed together or if the wrong amounts of materials are mixed, etc. Mixing operations should be identified in the loss control report.
43Go to Question 6Even if there is no intentional chemistry or mixing of different substances, some physical processing could pose a risk for losses. Drying operations could pose a fire risk or grinding operations of a flammable material could pose a risk for dust explosions.
44Go to Question 7If there is no intentional chemistry, mixing or physical processing of materials at the facility, there is still a potential risk for losses if hazardous materials are stored at the facility. If fertilizer is sold at a garden center and it is stored next to paint thinner in the warehouse storage racks, is there a problem? What happens if a fork-truck ruptures a can of the paint thinner and it spills on the bag of fertilizer?If there are no hazardous materials used or stored at the facility, then there are no issues of concern.
45Chemical StorageStorage of drums of chemicals on a rack system.
46Even though there are some intentional chemical process such as combustion of fuel to heat the facility, we are not concerned with this in our evaluation of chemicals in this presentation. Refer to our regular property resources when evaluation heating and boiler systems.
47If there is no intentional chemistry at the facility, but mixing or physical processing of a material causes heat to be generated there may be a potential fire hazard. How is the heat controlled during these processes?
48If there is no intentional chemistry, mixing, or physical processing, or if there is mixing and physical processing but no heat is generated; then we only need to be concerned with stored materials that may be a concern if they are not handled properly. These are only a few examples of spontaneously combustible materials. There are many more. Check containers and MSDS if there is question concerning these materials.
49Other storage hazards include materials that can form peroxides during storage. These are only a few examples. There are many more. Check containers and MSDS if there is question concerning these materials.
50Water reactive chemicals are another storage concern Water reactive chemicals are another storage concern. These are only a few examples. There are many more. Check containers and MSDS if there is question concerning these materials.
51Oxidizers are another storage concern. These are only a few examples Oxidizers are another storage concern. These are only a few examples. There are many more. Check containers and MSDS if there is question concerning these materials.
52Materials that can polymerize or decompose are another storage concern Materials that can polymerize or decompose are another storage concern. These are only a few examples. There are many more. Check containers and MSDS if there is question concerning these materials.
53The last question in the flowchart has to do with mixing of incompatible materials. This is the main concern with storage of chemicals. If mixing could result in a negative consequence (fire, explosion, toxic release, etc.), then controls need to be in place to prevent accidental mixing.
54Chemical Spills/Waste Assume all chemicals are reactiveMany fires start in dumpsters/waste containers due to mixing of incompatible chemicalsSome reactions are immediateMany reactions may take hours or moreWaste segregation by typeSpill procedures and trainingHAZMAT proceduresOne of the most common ways incompatible materials get mixed together is during spill cleanup. If a strong oxidizer like a swimming pool chemical that is spilled on the floor is swept up and thrown into a waste basket with paper, the paper could combust due to oxidation. Some times a fire starts immediately but in most cases the fire starts many hours later.It is also important the waste handling procedures also incorporate analysis of chemical incompatibility. There should be containers for waste solvents, separate containers for waste acids, waste caustics, etc. so incompatible wastes are not mixed together.
55Incompatible Materials Evaluation Step one: Determine if there are Undesirable ConsequencesToxic gas generationCorrosive gas or liquid generationFlammable gas generationFormation of shock-sensitive or explosive materialsExplosionFireOff-gas generation that can rupture containersSufficient heating to cause runaway reactionAn evaluation for chemical incompatibility involves 3 steps. The first is to determine if there are any negative consequences if specific materials are mixed. A review of MSDS, labels, and other technical resources can help with this determination. Use other reference materials (Bretherick’s Handbook of Reactive Chemical Hazards, Wiley’s Guide to Chemical Incompatibilities, NFPA 491- Hazardous Chemical Reactions. In some cases tactual testing is done in a laboratory to see if there are any chemical reactions when materials are mixed.
56Incompatible Materials Evaluation Step two: Identify Mixing ScenariosLeaking containersPumping into wrong storage tank, vesselCross connected line left openMaterial mislabeled or unlabeledWrong material selected by operatorWaste materials combined in tank or containerWaste material combined in sewerContaminated raw materialResidue from previous batch in equipmentCleaning materials left in process equipmentFire or explosionOnce the negative consequences of mixing are identified for specific materials then an evaluation needs to be conducted to determine the potential mixing scenarios where the materials could come into contact.
57Incompatible Materials Evaluation Step Three:Provide Controls to Prevent MixingTrainingSegregationEngineering ControlsThe last step in the evaluation of incompatible chemical mixing is to implement controls.
58Chemical Storage Principles SegregationProtection from Physical DamageHazard IdentificationFire ControlThese are the 4 basic principles for storing chemicals.Incompatible materials should be segregated. Isolation in a separate building or by fire walls, or distance can be used. The extant of segregation depends on the quantities of materials stored.Containers of chemicals need to be protected from damage due to fork-trucks, weather, etc.All areas where chemicals are stored should have warning signs and specific containers should be labeled.The fire extinguishing system for the storage area should be compatible to the materials stored in the area.
59Storage Guidelines Ensure containers are labeled Segregate incompatibles by hazard classDo not store alphabeticallyStore flammables according to GC property guidelinesDo not store chemicals above eye levelDo not overcrowd shelvesAvoid storing chemicals on floorLiquids should be stored in unbreakable packagingThese are some basic general guidelines to be followed when storing chemicals.
60Chemical Segregation Scheme Compressed Gases- FlammableCompressed Gases- OxidizingAcidsBasesFlammable LiquidsFlammable SolidsOxidizersReducersWater-ReactivePeroxide Forming ChemicalsPoisons/ToxinsCarcinogensA storage scheme that segregates chemicals by their hazard class is a good way to separate incompatibles. These are the common classes of hazardous chemicals.
61Chemical Incompatibility Chart AcidsInorganicOxidizingOrganicAlkalisBasesOxidizersPoisonsWaterReactivesSolventsXCharts such as this are another way of identifying chemical incompatibles. An “X” denotes that the two materials are incompatible.
62Loss Control Evaluation of Chemicals Improper storage of incompatiblesLeaking or deteriorating containersSpilled chemicalsTemperature extremesLack of or low lighting levelsBlocked exits or aislesSecurity of storage areaTrash accumulationEvidence of smokingAdequate ventilationHazard communication programEmployee trainingWaste handling proceduresHAZMAT proceduresIntentional chemistry performedFire extinguishersSprinkler systemWarning signsLabelingMSDSsFor the most part loss control staff will not be involved with identification and analysis of some of the more technical areas of chemical storage and chemical processing. Experts are needed when determining the hazards of many chemical substances. We should be aware of some basic chemical storage principles and address these in the loss control surveys.
63Loss Control Evaluation of Chemicals Housekeeping, labeling, and spill containment are typical things that should be evaluated.
65Chemical Storage Cabinets Are storage cabinets available and are they being used?
66Storage CabinetsIn this case the cabinets are not being used or the space for storage is inadequate.
67Chemical Handling/Dispensing How chemicals are handles by employees is important. Is PPE adequate?
68Painting AreaPoor housekeeping is typical of painting operations. The large number of solvents left on the bench poses a fire hazard.
69DOT LabelsHazardous materials fall under the labeling requirements of U.S. DOT for placarding both for bulk transport and nonbulk transportDOT has assigned each hazardous material or group of materials a unique four digit ID number for cross reference by hazardous response personnelThe labels are color coded and may also include a single digit Hazard Class Number and a universal symbolOne of the best ways to evaluate chemicals quickly during a walk-through survey is to look at the labels and marking on the containers. There are a number of labeling systems. DOT labels and placards are one type of label that may be present.
70DOT LabelsDOT labels are the type we most often see on containers in the fieldUniversal SymbolThe Class number can be referenced to the DOT Emergency Response Guidebook to identify the specific chemical material and its hazards.U.N. Hazard Class Number
71DOT LabelsDOT labels classify materials according to the chemical hazard class.
73DOT Labels Class 1- Explosives Division 1.1- Explosives with a mass explosion hazardDivision 1.2- Explosions with a projection hazardDivision 1.3- Explosives that are a fire hazardDivision 1.4- Explosives with no significant blast hazardDivision 1.5- Very insensitive explosivesClass 4- Flammable solids, Spontaneously combustible materials and materials dangerous when wetDivision 4.1 Flammable solidsDivision 4.2 Spontaneously combustible materialsDivision 4.3 Materials that are dangerous when wetClass 5- Oxidizers and Organic PeroxidesOxidizersOrganic PeroxidesHazard classes are also broken down further into divisions.
74DOT LabelsPay particular attention to Explosive labels.
75DOT LabelsThese are other labels that we should watch for.
76NFPA LabelsNFPA also has a labeling system that is commonly encountered. Labeling requirements are in NFPA 704- Identification of the Hazards of Materials for Emergency Response.
77NFPA Labels Flammability Health Reactivity Special Hazard The label is color coded with a rating from 0 to 4 for Health, Flammability and Reactivity. Special Hazards are also noted.ReactivitySpecial Hazard
78NFPA LabelsNFPA 704Hazards rating based upon exposure hazards during firesReactivity rating based on reactions with waterIt is important to remember that the hazard rating is based on the hazards in a fire situation. The scoring is designed to give fire fighters hazard information as they encounter chemicals while using water which is used to fight fires. Consequently, oxidizers and water reactive chemicals are rated high because they are water reactive.
79NFPA LabelsHealth4- Materials that can cause death or serious chronic injury with very short exposure3- Materials that can cause serious temporary or chronic injury with short exposure2- Materials that can cause temporary injury or possible chronic injury with intense exposure1- Materials that can cause irritation but only minor chronic injury0- Materials that cause no hazard beyond those of ordinary combustibles in a fire situation
80NFPA Labels Flammability 4- Materials that rapidly or completely vaporize at atmospheric pressure and normal temperature and burn readily3- Liquids and solids that can be ignited under almost all ambient temperature conditions2- Materials that must be moderately heated before ignition occurs1- Materials that must be preheated before ignition occurs0- Materials that will not burn
81NFPA Labels Reactivity 4- Materials that are readily capable of detonation or explosive decomposition at normal temperatures and pressures3- Materials that are capable of detonation or explosive decomposition but require a strong initiating source or must be heated under confinement, or explosively react with water2- Materials that readily undergo violent chemical change at elevated temperature or pressure, or react violently with water1- Materials that are normally stable but can become unstable at elevated temperatures or pressures0- Materials that are normally stable even under fire exposure and are not reactive with water
82HMIG (Hazardous Material Information Guide) HMIG labels are another common labeling system. Chemical manufactures may use this system for labeling health, flammability and reactivity hazards of chemicals. It is also used as a system for labeling containers of transferred chemicals in a facility for compliance to OSHA’s Hazard Communication Standard.
83HMIG LabelsRating for each category is from 0 to 4 and is similar to the NFPA system except that the hazard is not based upon fire hazards of the chemical but on general toxicity, flash point and reactivity. A letter denotes the combination of PPE that should be worn when using the chemical.
84Housekeeping IssuesHousekeeping should be evaluated in conjunction with chemical storage area evaluations. Waste materials increase the fire hazard and likelihood that incompatibles may be mixed together.
86LabelingUnlabeled containers or containers without proper hazard information are an indicator of a problem. Incompatible materials or the wrong material may be mixed together as a consequence.
87Chemical Storage/Reactivity Red Flags PermanganatesHypochloratesPersulfateWater reactiveNitroAzidesCuring agentHardenerInitiatorPromoterAcidsBasesUnstablePyrophoricPeroxideOxidizerCatalystAcceleratorActivatorPolymerizationReducerChromateDichromatesNitratePerchlorateNitric acidChloratesWhen evaluating chemical use and storage at a facility, these are some times of terms or chemicals that should raise your concerns about reactivity hazards and incompatible materials.
8810 Loss Control Questions Are hazardous substances stored or handled at the facility?Have materials been evaluated for potential reactivity hazards or incompatibility if they are accidentally mixed together?Is intentional chemistry performed?Is there mixing of different substances?Is heat generated during mixing or processing?Are any spontaneously combustible materials, peroxides, water reactive materials, oxidizers or self-reactive (polymerizable) materials used or stored?Are incompatible chemicals segregated?Are storage containers properly labeled and identified?Are storage containers in good condition?Are employees properly training in Hazard Communication and proper chemical handling and storage procedures?These are the 10 most important questions that need to be answered when evaluating chemical hazards. A good loss control survey report will discuss and analyze these issues.
89Other Sources of Information OSHA – Many resources are available under “chemical reactivity hazards” in the topics indexEssential Practices for Managing Chemical Reactivity Hazards- Center for Chemical Process Safety- Download from OSHA’s websiteOrganic Peroxides- E&S PC-30-11Chlorinated Swimming Pool Sanitizers- E&S PC-30-02Contact the HO EH Specialist
90Post-test What are the 4 principles for good chemical storage? Match the following chemicals to the appropriate reactivity hazard:___Peroxides A- Air Sensitive___Acrylic Resins B- Spontaneous Peroxide Formation___Metal Dusts C- Strong Oxidizers___Ethers D- Polymerization Hazard___Hydrogen E- ReducerExplain why intentional chemistry processes are a major concern from a potential loss standpoint.List 10 things that should be reviewed when evaluating chemical storage areas.