On Office Fire Prevention Strategies

Learn the location of fireescape routes and how to activate the fire alarm. Participate in practice firedrills on a regular basis. Become familiar with stairway exits - elevators maynot function during a fire, or may expose passengers to heat, gas and smoke.

Through a program of scheduled inspections, unsafe conditions can be recognizedand corrected before they lead to serious injuries. Take a few moments each dayto walk through your work area. Look for items previously pointed out, such asobjects protruding into walkways, file cabinets that are weighted toward thetop or frayed electrical cords. Advise personnel in the area of the hazards andset about correcting them.

• Heat-producing equipment - copiers, work processors, coffee makers and hotplates - are often overlooked as a potential fire hazard. Keep them away fromanything that might burn.

•  Electrical appliances can be fire hazards. Be sure to turn off allappliances at the end of the day. Use only grounded appliances plugged intogrounded outlets (three prong plug).

•  If electrical equipment malfunctions or gives off a strange odor, disconnectit and call the appropriate maintenance personnel. Promptly disconnect andreplace cracked, frayed, or broken electrical cords.

• Keep extension cords clear of doorways and other areas where they can bestepped on or chafed and never plug one extension cord into another.

• Do not allow combustible material (boxes, paper, etc.) to build up ininappropriate storage locations (near sources of ignition).

Emergency Preparedness
One result of the recent trend toward open officeenvironments is that smoke from office fires is not contained or isolated aseffectively as in less open designs. Open office designs allows smoke to spreadquickly and the incorporation of many synthetic and other combustible materialin office fixtures (such as furniture, rugs, drapes, plastic wastebaskets, andvinyl covered walls) often makes 'smoky' fires. In addition to being smoky,many synthetic materials can emit toxic materials during a fire.

For example, cyanide can be emitted from urethane which is commonly used inupholstery stuffing. Most burning materials can emit carbon monoxide.Inhalation of these toxic materials can severely hamper an office worker'schances of getting out of a fire in time. This makes it imperative for officeworkers to recognize the signal to evacuate their work area and know how toexit in an expedient manner.

The local emergency action plan will address potential emergencies that can beexpected in your work area. For emergency evacuation, the use of floor plans orworkplace maps that clearly show the emergency escape routes and safe or refugeareas should be included in the plan.

All employees must understand what actions theyare to take in the work area and assemble in a safe zone. All new employeesshould discuss how they should respond to emergencies with their supervisorsshortly after starting work and whenever their responsibilities under the planchange.

This orientation should include:

Identifyingthe individuals responsible for various aspects of the plan (chain of command)so that in an emergency confusion will be minimized and employees will have nodoubt about who has authority for making decisions.

Identifyingthe method of communication that will be used to alert employees that anevacuation or some other action is required as well as how employees can reportemergencies (such as manual pull stations, public address systems, ortelephones).

Identifyingthe evacuation routes from the building and locations where employees willgather

General guidancefor fires and related emergencies includes:

If you discover a fire or see/smell smoke,immediately follow these procedures:

Notifythe local Fire Department

NotifyCDC Physical Security or Building Security Force

Activatethe building alarm (fire pull station). If not available or operational,verbally notify people in the building.

Isolatethe area by closing windows and doors and evacuate the building, if you can doso safely.

Shut downequipment in the immediate area, if possible.

Ifpossible and if you have received appropriate training, use a portable fireextinguisher to:

assist oneself to evacuate;
assist another to evacuate; and
control a small fire.

Do notcollect personal or official items; leave the area of the fire immediately andwalk, do not run to the exit and designated gathering area.

Youshould provide the fire/police teams with the details of the problem upon theirarrival. Special hazard information you might know is essential for the safetyof the emergency responders. You should not re-enter the building untildirected to do so. Follow any special procedures established for your unit.

If thefire alarms are ringing in your building, you must evacuate the building andstay out until notified to return. Move to your designated meeting location orupwind from the building staying clear of streets, driveways, sidewalks, andother access ways to the building. If you are a supervisor, try to account foryour employees, keep them together and report any missing persons to theemergency personnel at the scene.

If anindividual is overexposed to smoke or chemical vapors, remove the person to anuncontaminated area and treat for shock. Do not enter the area if you suspectthat a life threatening condition still exists (such as heavy smoke or toxicgases). If CPR certified, follow standard CPR protocols. Get medical attentionpromptly.

If youror another person's clothing catches fire, extinguish the burning clothing byusing the drop-and-roll technique, wrap victim in a fire blanket or dousevictim with cold water (use an emergency shower if it is immediatelyavailable). Carefully remove contaminated clothing; however, avoid furtherdamage to the burned area. Cover injured person to prevent shock. Get medicalattention promptly.

Fire Understanding

The Phenomenon of Fire

Fire is the visible heat energy being released from rapid oxidation of afuel.  Something is
'on fire' when the exothermal release of heat from the oxidation reactionreaches visible light level.

Basically, combustion takes place within two modes-flaming andflameless. The flaming mode can be viewed as a tetrahedron, with each siderepresenting one of the four basic
components of flaming combusion: fuel, heat, oxygen and uninhibited chainreaction. Here the practical emphasis is on extinguishing an existingfire.

The classic fire triangle illustrates the flameless mode, the three legsrepresenting fuel, oxygen and heat. Air provides oxygen forcombustion. The heat required for ignition varies with the characteristicsof the fuel. Fuel is any substance that will sustain combusion after theinitial application of heat to start it. Here the practical emphasis is onpreventing a fire from starting by prohibiting the formation of thetriangle.    

How Flammable Liquids Safety Equipment Defeats Fire

Safety equipment for use in storing, transporting or dispensingflammable liquids is designed to control one or more of the legs of the FireTriangle.

Containment of the liquid fuel to prevent it from spreading in event offire is a primary function of all safety containers. These containers includesafety cans, rinse and wash tanks, bench and plunger cans, rinse and washtanks, bench and plunger cans, drip cans, storage cabinets, waste containersand others.

Dissipation of heat to prevent flammable liquid vapor from reachingignition temperature is another function built into certain types of safetyequipment. This is accomplised by the flame arrester which is common tosafety cans and faucets, bench cans and other equipment. The flame arrester, inthe form of a wire mesh screen or perforated baffle plate, permits escapingvapor to burn but dissipates heat so that vapor inside the container will notignite or explode.

Closing out oxygen is still another function of certain safetycontainers. For example, when the lids of self-closing rinse and cleaningtanks shut, they snuff out fire by closing off the oxygen supply.

Characteristics of Flammable Liquids

In order to best understand the hazards of flammable liquids and thecontrol procedures and to interpret the tabular material, the followingdefinitions will prove useful.

Underwriters Laboratories, Inc., Flammability Hazard Classification.

In addition to the NFPA, this is also a system for grading the relativeflammability hazards of various liquids. This is a useful classificationbecause actual hazard in use of a flammable liquid is dependent on a number offactors in addition to flash point. These are the UL classes of relativeflammability hazards:

Ether : class 100 (max hazard)
Gasoline : class 90-100
Alcohol (ethyl) : class 60-70
Kerosene  : class 30-40
Paraffin Oil : class 10-20

Classifications, Flammable and Combustible Liquids.  

A flammable liquid is one having a flash point below 100 degree F andhaving a vapor pressure not exceeding 40 lb/sq in. absolute at 100 degree F. Acombustible liquid is one having a flash point at or above 100 degree F.

Vapor. In any liquid there is a constant movement ofmolecules. As temperature increases, the molecules speed up, someacquiring enough energy to escape from the liquid surface as a vapor.When vaporescapes from a flammable liquid into the air, a flammable or explosivesituation can occur, dependent upon the proportions of the air/vapor mixture.

Flash point is the lowest temperature of a flammable liquid at which itgives off vapor sufficient to form an ignitable mixture with the air near thesurface of the liquid or within the vessel used. Combusion is not continuous atthe flash point. Flash point is the basic characteristic used by NFPA toclassify the relative hazards of liquids.

Ignition temperature is the minimum temperature to which flammableliquid vapor in air must be heated in order to initiate or cause self-sustainedcombustion independently of the original heat source.One might tend to discountthe high hazards of flammable liquids when noting the relatively high ignitiontemperatures (gasolines, for example, are in the 500 to 800 degree Frange). But what must be recognised is that an extremely small area andduration of temperature contact is all that's needed to set flammable vaporaflame. A static spark with the duration of a few thousandths of a second,contacting a few molecules of the vapor/air mixture is enough to raise thetemperatures above the ignition point.

Flammable (explosive) range of flammable liquids is the percentage rangeof liquid vapor in air, by volume, within which ignition canoccur. Gasoline, for example, has an explosive range between 1.4% and7.6%. This indicates that any concentration of gasoline vapor in airbetween these percentage limits will ignite at any temperature above -45 degreeF (flash point) when an ignition source provides a contact temperature in therange of 500 degree to 800 degree F (ignition temperature, depending on type ofgasoline). Auto engine carburetion is designed to keep the gas/air mixturefed to the cylinders within this explosive range. Too 'lean' a mixture (near orbelow 1.4%) or too 'rich' (at or above 7.6%) causes engine firing failure orfaulty operation because the gasoline vapor/air mixture is at the limits of theexplosive range.

Explosive range figures are based on normal atmospheric temperatures andpressures.  There may be a considerable variation in explosive range whereother temperatures and pressure are present. Increases in temperature willwiden the explosive range.  Pressure differences depend on theflammable liquid involved but substantial vacuum (pressure decrease) willgenerally narrow the explosive range.

Specific gravity of flammable liquids is important in fire preventionplanning to anticipate behavior of hazardous materials where water or otherliquids are present under fire conditions. Many flammable liquids withspecific gravity below 1 (lighter than water) are also insoluble inwater. In the event of fire with such liquids present, water may beineffective as an extinguishing agent.

Water solubility refers to the degree to which a flammable liquid issoluble in water. This is useful in determining effective extinguishingagents and methods. Alcohol-resistant type foam, for example, is usuallyrecommended for water soluble flammable liquids.

Vapor pressure of liquids is below 40 pounds per square inch absolute,at 100 degree F, by definition. Materials with higher vapor pressures aredefined as gases at 100 degree F to establish a convenient technical separationbetween the two forms of matter. Vapor pressure is the pressure exerted byvapor above the surface of a liquid in a closed container. It is caused byevaporation and is stabilized by confinement in a closed container to apressure characteristic of the specific liquid.As temperature increases, thevapor pressure of a liquid increases. At the point where the vaporpressure equals atmospheric pressure, the escape of molecules from the liquidsurface is greatly accelerated and boiling takes place.

Vapor pressures of flammable liquids are an important consideration infire prevention.They give the relative speed of evaporation: the higher thevapor pressure, the greater the evaporation rate and the more vapor escapepotential every time a safety container is opened.

Boiling point of a liquid is the temperature of the liquid at which itsvapor pressure equals the atmospheric pressure.

Vapor density, as commonly used in fire protection, is the weight of avolume of pure gas compared to the weight of an equal of volume of dry air atthe same temperature pressure.  A figure greater than 1 indicates that agas is heavier than air. This means that any escaped vapor will settledownward onto floors and flow with air currents, around corners and down stairsor elevator shafts to pool in low spots. If the source liquid is open and acontinuous supply of vapor is flowing, a spark anywhere along the vapor trail -perhaps hundreds of feet or several floors away - will set off an explosion andfire that may envelop an entire building almost instantly.