Flammable and Combustible Liquids. Introduction !The two primary hazards associated with flammable and combustible liquids are explosion and fire !Safe.

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Presentation transcript:

Flammable and Combustible Liquids

Introduction !The two primary hazards associated with flammable and combustible liquids are explosion and fire !Safe handling and storage of flammable liquids requires the use of approved equipment and practices per OSHA standards

Flash Point !Flash point means the minimum temperature at which a liquid gives off enough vapor to form an ignitable mixture !In general, the lower the flash point, the greater the hazard !Flammable liquids have flash points below 100 o F, and are more dangerous than combustible liquids, since they may be ignited at room temperature !Combustible liquids have flash points at or above 100 o F !Although combustible liquids have higher flash points than flammable liquids, they can pose serious fire and/or explosion hazards when heated

Classes of Flammable and Combustible Liquids IIIA II IC IAIB Flash Point ( o F) 100 Boiling Point ( o F) Combustible (FP > 100 o F) Flammable (FP < 100 o F)

Classes of Some Flammable Liquids CLASS IA CLASS IB CLASS IC Common NameFlash Point ( o F) Ethyl Ether-49 Gasoline-45 Methyl Ethyl Ketone21 Toluene40 Xylene Turpentine95

Program Components !Control of ignition sources !Proper storage !Fire control !Safe handling A good plan for safe use of flammable and combustible liquids contains at least these components:

Sources of Ignition !Open flames !Smoking !Static electricity !Cutting and welding !Hot surfaces !Electrical and mechanical sparks !Lightning Must take adequate precautions to prevent ignition of flammable vapors. Some sources of ignition include:

Static Electricity !Generated when a fluid flows through a pipe or from an opening into a tank !Main hazards are fire and explosion from sparks containing enough energy to ignite flammable vapors !Bonding or grounding of flammable liquid containers is necessary to prevent static electricity from causing a spark

Bonding !Physically connect two conductive objects together with a bond wire to eliminate a difference in static charge potential between them !Must provide a bond wire between containers during flammable liquid filling operations, unless a metallic path between them is otherwise present

Grounding !Eliminates a difference in static charge potential between conductive objects and ground !Although bonding will eliminate a difference in potential between objects, it will not eliminate a difference in potential between these objects & earth unless one of the objects is connected to earth with a ground wire

Ventilation Always provide adequate ventilation to reduce the potential for ignition of flammable vapors.

Storage Fundamentals !Identify incompatible chemicals – check the Material Safety Data Sheet !Isolate and separate incompatible materials >Isolate by storing in another area or room >Degree of isolation depends on quantities, chemical properties and packaging >Separate by storing in same area or room, but apart from each other

Storage of Flammable and Combustible Liquids !Storage must not limit the use of exits, stairways, or areas normally used for the safe egress of people !In office occupancies: >Storage prohibited except that which is required for maintenance and operation of equipment >Storage must be in: =closed metal containers inside a storage cabinet, or =safety cans, or =an inside storage room Inside storage room

Safety Cans for Storage and Transfer !Approved container of not more than 5 gallons capacity !Spring-closing lid and spout cover !Safely relieves internal pressure when exposed to fire

Flame Arrester Screen !Prevents fire flashback into can contents !Double wire-mesh construction !Large surface area provides rapid dissipation of heat from fire so that vapor temperature inside can remains below ignition point

Storage Cabinets !Not more than 60 gal of Class I and/or Class II liquids, or not more than 120 gal of Class III liquids permitted in a cabinet !Must be conspicuously labeled, “Flammable - Keep Fire Away” !Doors on metal cabinets must have a three-point lock (top, side, and bottom), and the door sill must be raised at least 2 inches above the bottom of the cabinet

Fire Control !Suitable fire control devices, such as small hose or portable fire extinguishers must be available where flammable or combustible liquids are stored !Open flames and smoking must not be permitted in these storage areas !Materials which react with water must not be stored in the same room with flammable or combustible liquids

Transferring Flammable Liquids 1.Through a closed piping system 2.From safety cans 3.By gravity through an approved self-closing safety faucet 4.By means of a safety pump Since there is a sizeable risk whenever flammable liquids are handled, OSHA allows only four methods for transferring these materials:

Self-Closing Safety Faucet !Bonding wire between drum and container !Grounding wire between drum and ground !Safety vent in drum

Safety Pump !Faster and safer than using a faucet !Spills less likely !No separate safety vents in drum required !Installed directly in drum bung opening !Some pump hoses have integral bonding wires

Waste and Residue Waste drum with disposal funnel Safety disposal canOily-waste can (self-closing lid) Combustible waste and residue must be kept to a minimum, stored in covered metal receptacles and disposed of daily.

Safe Handling Fundamentals !Carefully read the manufacturer’s label on the flammable liquid container before storing or using it !Practice good housekeeping in flammable liquid storage areas !Clean up spills immediately, then place the cleanup rags in a covered metal container !Only use approved metal safety containers or original manufacturer’s container to store flammable liquids !Keep the containers closed when not in use and store away from exits or passageways !Use flammable liquids only where there is plenty of ventilation !Keep flammable liquids away from ignition sources such as open flames, sparks, smoking, cutting, welding, etc.

Summary !The two primary hazards associated with flammable and combustible liquids are explosion and fire !Safe handling and storage of flammable liquids requires the use of approved equipment and practices per OSHA standards !An excellent reference on this topic is National Fire Protection Association Standard No. 30, Flammable and Combustible Liquids Code