flash point vs 2

7/30/2019 Flash Point vs 2

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Flash Point-Ignition Point

What?

At Work Or At Home


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Everyday We Use ChemicalsWhether At Work Or In The

HomeProper Storage & UnderstandingHow Dangerous Chemicals Can

Become If Subjected To Heat IsUsing Just Using Good Safety

Common Sense.


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Flammable LiquidsProperties of Flammable Liquids

The vapor of a flammable liquid ignites andcauses fire or explosion not the liquid itself.

The flammability of a liquid depends on itsphysical properties:

Vapor Pressure

Flash Point

Limits of Flammability

Vapor Density


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Flammable LiquidsVapor Pressure

Vapor pressure is a measure of how fasta liquid evaporates.

The higher the vapor pressure the more

rapidly the liquid will evaporate.

Vapor pressure goes up and down withthe temperature of the liquid.

Hydraulic Systems uses oil under pressureto harness the usefulness of chemicals.When System are compromised, hazardousconditions can be magnified.


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What is Flash Point?

Flash point is the lowest temperature at which a

liquid can form an ignitable mixture in air near thesurface of the liquid.

The lower the flash point, the easier it is to ignitethe material. For example, gasoline has a flash

point of -40 degrees C (-40 F) and is moreflammable than ethylene glycol (antifreeze) whichhas a flash point of 111 degrees C (232 F).
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What Is Ignition Point

Ignition point

The minimum temperature at which asubstance will continue to burn withoutadditional application of external heat. Also

called kindling point.


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Flammable LiquidsLimits of Flammability

The limits of flammability is the range thata mixture of air and vapor is flammable.

Mixtures can be too lean (not enoughvapor) or too rich (too much vapor) to igniteand burn.


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Flammable Liquids

Flammable Limits Example

LEL lower explosive limit

UEL upper explosive limit


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Flammable LiquidsLower Explosive Limit LEL

In most work situations, thelower explosive limit (LEL) isthe main concern.

Vapors from flammable liquidscan be found in the workplace,but are often too diluted tocatch fire or explode.

However, these vapors canquickly go above the LEL in smallroom or confined space like atank.


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Flammable LiquidsVapor Density

Vapor density is a measure of howheavy a vapor is compared to air.

Vapors with a density greater than1.0 are heavier than air and cancollect near the floor, and flow like aliquid.

This may create a fire/explosionhazard if the vapor flows to anignition source.


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Boiling PointDefinition

Boiling point is the temperature at whicha liquid changes to a gas (vapor) at normalatmospheric pressure. A more specificdefinition of boiling point is the temperatureat which the vapor pressure of a liquid is

equal to the external pressure.
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Example of Boiling Point

Water freezes at32 F.

Turns to liquid at

above 32 F.Boils & changes to

Gas at 212 F.

Expands 17,000times it normal sizewhen heated.


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Boiling Point

MSDS relevance

Knowing the boiling point of a substance is an importantconsideration for storage. For example, storing a chemicalwith a boiling point of 50 C (122 F) in direct sunlight or

next to a boiler could cause the material to completelyvaporize and/or result in a fire or explosion. Items with alow boiling point generally have a high vapor pressure.Containers of such material can build up significantpressure even when they are below their boiling point.

Likewise, low-boiling materials easily produce largeamounts ofvapor which can be flammable or evenexplosive.
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When Condition Are Just RightAccidents Result

A spectacular example of the consequences of introducinga spark to a flammable limit atmosphere occurred inNewcastle in September of 2003. A pipe fitter left anacetylene cylinder inside his vehicle over the weekend.Either the cylinder had a small leak or the valve was not

fully closed. The flammable limits for acetylene areextremely broad, 2.5% to 100% in air.

Flashpoint is 0 F/-18C. Boiling point is -119F/-84C. When the worker opened the door, an undetermined spark

source (the door light switch, light bulb, cellular phone,

static etc.) Ignited the mixture with catastrophic results: In the close-up view notice how the roof/door pillars are

bent completely sideways. It is amazing that the worker'sinjuries were confined to his face and ear drums.


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What Makes Flash & Ignitions PointsDangerous.

Any combustible material such as: solid,liquid, or gas. Most solids and liquids must

vaporize before they will burn.

Sufficient oxygen must be present in theatmosphere surrounding the fuel for fire toburn.


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Flash & Ignition Points

Sufficient heat energy must be

applied to raise the fuel to its

ignition temperature.

Open flame Hot surfacesSparks and arcs Friction

This reaction can occur when

all three of the above elements

are present in the proper

conditions & proportions.


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Extinguishment Theory

Remove Heat

Remove Fuel

Reduce Oxygen

WILL

Inhibit Chemical

Chain Reaction


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Proactive Fire SafetyFire Risk Analysis

How do we identify potential fire risk?


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Proactive Fire SafetyFire Risk Analysis Cont.

Identify the fuel source & eliminate it if possible.

Identify the heat source and eliminate it ifpossible.

Terminate behaviors that lead to hazardousconditions & replace with appropriate behaviorsconducive to good fire safety.

1. Storing flammable and combustible in appropriateareas.

2. On equipment, in fire cabinets, in work areas.


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Identifying Fire Hazards In YourWork Area

What chemical are present in your workarea? What are there flash points? In stationary equipment areas

On mobile equipmentAt shops

What heat source are present?

Thermal (heat) Electrical

Radiant


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Do You Know Your Flashpoints?

The following is a list of chemicals used onthis site, some of these you may even useat home.

Do you know how they are stored?

At work?

At home?See if you know which chemical is which.


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Try & Match Flashpoints With TheChemical

247f/119c 145f/78c 160f 320f/160c 356f/180c


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Did You Choose Right

247f/119c------Antifreeze/Eythleneglycol

145f/78c--------


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Answer

160f------Diesel Fuel-IP 500f

320f/160c-----Form Oil

356f/180c-----40-wt Hydraulic Oil


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Answer

0f/-18c----Acetylene Gas-BP -119f

-101f/-75.9c-Butane, AutoIP 778f

None------


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Answer

-156f/-104c--Propane-Auto IP 842f

-43.7f/-42c----

79fCarburetor Cleaner-BP 110F


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Answer

73f/23c-------------

175f----


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In Conclusion

Any Situation that can lead to a fireunderground is not good.

Lets all do our part to make sure our workareas are accident free & fire safe.

Thank You.

flash point vs 2

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