fires and explosions: what you need to know to prevent them
TRANSCRIPT
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Fires and Explosions: Fires and Explosions:
What You Need to Know to What You Need to Know to
Prevent ThemPrevent Them
CSChE PSM SymposiumCSChE PSM Symposium
Edmonton, AlbertaEdmonton, Alberta
20072007
Gerry Phillips, GC Phillips Consulting Ltd.Gerry Phillips, GC Phillips Consulting Ltd.
Norman Nibber, Independent Risk ControlNorman Nibber, Independent Risk Control
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ObjectivesObjectives
�� Understand Understand
��Characteristics of Flammable Liquids & Characteristics of Flammable Liquids &
VapoursVapours
��Effect of Temperature and Pressure on Effect of Temperature and Pressure on
flammability flammability
��Effect of Inert Substances on firesEffect of Inert Substances on fires
��Ignition HazardsIgnition Hazards
�� Practical knowledge required to prevent Practical knowledge required to prevent
Process FiresProcess Fires
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What is a Fire ?What is a Fire ?
Fire is a Chemical ReactionFire is a Chemical Reaction
��Fuel reacts with oxidizersFuel reacts with oxidizers
��Produces, heat, light, products Produces, heat, light, products
of combustionof combustion
CH4 + 2O2 => CO2 + 2H2OCH4 + 2O2 => CO2 + 2H2O
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Understand What Burns!
�� What Burns What Burns –– Solids, Liquids or Solids, Liquids or
Vapours (Gases)?Vapours (Gases)?
�� Only Vapours (Gases) Burn! Only Vapours (Gases) Burn!
�� Solids and Liquids have to be Solids and Liquids have to be
converted to vapours before they converted to vapours before they
burn.burn.
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Conditions of a FireConditions of a Fire
�� It’s not a simple triangle but a Fire Pyramid: It’s not a simple triangle but a Fire Pyramid:
�� Combustible Material, Combustible Material,
��Oxygen, Oxygen,
��Heat or Source of Ignition and Heat or Source of Ignition and
�� Free RadicalsFree Radicals
�� Ignition source needed until fire is selfIgnition source needed until fire is self--
sustaining: sustaining:
�� Very quick for vapors Very quick for vapors
��More time for Liquids & Solids More time for Liquids & Solids
��Duration & temperature of ignition source are Duration & temperature of ignition source are
importantimportant
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Compressor Building Fire HazardsCompressor Building Fire Hazards
3
4
1
2
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Flammability ParametersFlammability Parameters
�� No single parameter defines No single parameter defines
flammability, but the major ones flammability, but the major ones
that influence it are:that influence it are:
��Flash PointFlash Point
��Flammable RangeFlammable Range
��Auto Ignition TemperatureAuto Ignition Temperature
��Minimum Ignition EnergyMinimum Ignition Energy
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Flash PointFlash Point
�� Flash Point is the minimum Flash Point is the minimum
temperature at which a liquid gives off temperature at which a liquid gives off
vapor in sufficient concentration to vapor in sufficient concentration to
form an ignitable mixture with air near form an ignitable mixture with air near
the surface of the liquidthe surface of the liquid
�� Note that published values are for pure Note that published values are for pure
components, under laboratory components, under laboratory
conditionsconditions
�� ExampleExample
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Flammable Liquids Storage Cabinet
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Use of Adsorbent PadsUse of Adsorbent Pads
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Collecting Oil LeaksCollecting Oil Leaks
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Flammable Materials Classification
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Compressed Liquefied Gases & Compressed Liquefied Gases &
Cryogenic CombustiblesCryogenic Combustibles
�� Compressed Liquefied GasesCompressed Liquefied Gases�� Flammable Gases stored above their normal Flammable Gases stored above their normal boiling point but kept in liquid state by pressure. boiling point but kept in liquid state by pressure.
��When released, liquid expands and vaporizes, When released, liquid expands and vaporizes, creating large volumes of cold gascreating large volumes of cold gas
�� The cold gas behaves like a heavierThe cold gas behaves like a heavier--thanthan--air gasair gas
�� Cryogenic Flammable Liquid Cryogenic Flammable Liquid �� Cryogenic liquids are generally below Cryogenic liquids are generally below --101°C101°C
�� Behave like flammable liquids when spilledBehave like flammable liquids when spilled
�� Liquid absorbs heat & vaporizes forming ignitable Liquid absorbs heat & vaporizes forming ignitable mixturemixture
Which is the worst fire hazard?
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Location of EquipmentLocation of Equipment
2
5
3
4
1
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Excellent Fire Protection Excellent Fire Protection
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Passive Protection?Passive Protection?
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Flammable Materials Classification
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Nitrogen Pad on Storage TankNitrogen Pad on Storage Tank
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Nitrogen Pad SupplyNitrogen Pad Supply
Trapped leg
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Methanol Storage TankMethanol Storage Tank
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Tanks Suck!Tanks Suck!
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Flammable Materials Classification
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What is the problem here? What is the problem here?
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Whoops!Whoops!
Lack of understanding of flash point
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Storing Flammable MaterialsStoring Flammable Materials
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Combustible GasesCombustible Gases
�� LighterLighter--thanthan--Air Air �� Dissipate rapidly in the atmosphereDissipate rapidly in the atmosphere
�� Affect Smaller area than heavierAffect Smaller area than heavier--thanthan--air gases air gases
�� Seldom accumulate to form ignitable mixture at Seldom accumulate to form ignitable mixture at grade grade -- Unless Confirmed or SubUnless Confirmed or Sub--cooledcooled
�� HeavierHeavier--thanthan--Air Air �� Fall to grade level when released Fall to grade level when released
�� Dispersed by natural or forced ventilationDispersed by natural or forced ventilation
�� When heated may behave as a lighterWhen heated may behave as a lighter--thanthan--air gasair gas
As the gas diffuses into the surrounding air, the As the gas diffuses into the surrounding air, the density of the mixture approaches that of air.density of the mixture approaches that of air.
What has this to do with
Preventing Process Fires?
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What is the Hazard?What is the Hazard?
Natural Gas Regulator
Vents
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Natural Gas RegulatorNatural Gas Regulator
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Autoignition TemperatureAutoignition Temperature
�� AIT AIT –– The minimum temperature The minimum temperature
required to initiate or cause selfrequired to initiate or cause self--
sustained combustion of a solid, sustained combustion of a solid,
liquid, or gas independently of the liquid, or gas independently of the
heating or heated element. heating or heated element.
�� Before anything burns its AIT must Before anything burns its AIT must
be exceeded.be exceeded.
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Wood Scaffold near Hot PipeWood Scaffold near Hot Pipe
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Autoignition Temperatures
..\..\..\RHA -
15.015.05.05.011661166630630Natural Natural
GasGas
6.86.80.90.9914914490490StyreneStyrene
7.87.81.21.2928928498498BenzeneBenzene
8.78.71.11.1682682361361cPentanecPentane
7.67.61.41.4469469243243ii--PentanePentane
FFCC
%UFL%UFL%LFL%LFL
Autoignition Autoignition
TemperatureTemperatureMaterialMaterial
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Effect of Molecular Weight on AIT
In air at 101 kPa
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Effects of Pressure on AIT
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Oil Soaked InsulationOil Soaked Insulation
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Flammability RelationshipsFlammability Relationships
UFL
LFL
VA
PO
R P
RE
SS
UR
E
AUTO
IGNITION
AITFLASH
POINT
MISTFLAMMABLE REGION
TEMPERATURE
CO
NC
EN
TR
AT
ION
OF
FU
EL
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Effect of Pressure on Flammability of Effect of Pressure on Flammability of
Natural Gas in Air at 28Natural Gas in Air at 28ooCC
Increasing Pressure:
- Reduces LFL Somewhat
- Increases UFL Considerably
- Reduces Flash Point & AIT
- Increases Maximum Attainable Pressure
- Increase Rate of Pressure Rise
Flammable mixtures
Pressure, Atm.
NA
TU
RA
L G
AS
, volu
me
-pe
rce
nt
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Flammability of Ethylene in Nitrogen
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Flammability of Pentane in Nitrogen
Minimum
Oxygen
Concentration
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Sources of IgnitionSources of Ignition
� Electrical Ignition Sources
� Hot Equipment or Piping
� Mechanical Heat Energy
� Chemical Heat Energy
� Heat of Compression
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Explosion Proof PanelExplosion Proof Panel
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Electrical Equipment JointElectrical Equipment Joint
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Electrical Seal Electrical Seal –– What is it?What is it?
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Storage in an Electrical Room
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Sources of IgnitionSources of Ignition
� Electrical Ignition Sources
� Hot Equipment or Piping
� Mechanical Heat Energy
� Chemical Heat Energy
� Heat of Compression
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Providing the MatchProviding the Match
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Sources of IgnitionSources of Ignition
� Electrical Ignition Sources
� Hot Equipment or Piping
� Mechanical Heat Energy
� Chemical Heat Energy
� Heat of Compression
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Belgian Pipeline Explosion
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Sources of IgnitionSources of Ignition
� Electrical Ignition Sources
� Hot Equipment or Piping
� Mechanical Heat Energy
� Chemical Heat Energy
� Heat of Compression
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PyrophoricPyrophoric Catalyst StorageCatalyst Storage
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Special Hazardous Chemicals
� Hydrogen
� Natural Gas
� Pyrophorics
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Battery Room ExplosionBattery Room Explosion
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Explosion Theory Objectives
� Be aware of conditions required for gas
and dust explosions
� Understand the types of explosions
and their effects
� Understand how various properties
affect explosion potential.
� Be aware of methods to prevent and
protect against explosions
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Ignition Energies
MaterialMaterial
Propane/OxygenPropane/Oxygen
Hydrogen/AirHydrogen/Air
Hydrocarbon/AirHydrocarbon/Air
Corn StarchCorn Starch
Min Ignition EnergyMin Ignition Energy
0.002 0.002 mJmJ
0.020.02
0.250.25
5050
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Ignition Energy SourcesIgnition Energy Sources
Energy SourceEnergy Source
Spark PlugSpark Plug
Person with Rubber Person with Rubber
Soled ShoesSoled Shoes
Person with Rubber Person with Rubber
Soled Shoes on a CarpetSoled Shoes on a Carpet
Energy Potential (Energy Potential (mJmJ))
20 20 –– 3030
0.05 0.05 –– 0.10 0.10
15 15 –– 4040
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Effects of Stoichiometry on MIEEffects of Stoichiometry on MIE
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Classes of Explosions
� Loss of Containment
� Deflagration
� Detonation
� BLEVE
� UVCE
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Effects of Material Properties on Gas/Vapour Explosions
� Flammable Range
� Minimum Ignition Energy
� Heat of Combustion
� Burning Velocity
� Rate of Pressure Rise
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Maximum Flame Speed
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Effects of Material Properties on Dust Explosions
� Minimum Explosible Concentration
� Particle Size vs. MIE
� Particle Size vs. Reaction Rate
� Moisture Content
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Dust Explosion PentagonDust Explosion Pentagon
Fuel
Ignition
Dispersion
Confinement
Oxygen
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Minimum Ignition Energy vs. Particle Size – Cellulose Acetate
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Effects of Process Variables on Unvented Vessels
� Temperature
� Initial Pressure
� Turbulence
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Effect of Temperature on Maximum Explosion Pressure for 5% Propane
High Initial temperature lower Density
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Effect of Temperature on Maximum Pressure Rise for 5% Propane
High Initial temperature less energy needed to get to AIT
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Effect of Initial Pressure on Maximum Explosion Pressure for 5% Propane
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Rate of Explosion Pressure Rise vs. Turbulence
Increase Turbulence increase convective heat transfer and reaction – increase energy
release rate
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Explosion Prevention
� Ventilation
� Inert Gas Blanketing / Purging
� Grounding & Bonding
� Flame Arresters
� Control of electric equipment
� Plant Layout
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Ventilation of Analyzer Room
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Differential PressureDifferential Pressure
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Hydrocarbon DetectionHydrocarbon Detection
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What Could Have Caused this!What Could Have Caused this!
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Small Bore PipingSmall Bore Piping
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A Failed Small Bore FittingA Failed Small Bore Fitting
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Explosion Prevention
� Ventilation
� Inert Gas Blanketing / Purging
� Grounding & Bonding
� Flame Arresters
� Control of electric equipment
� Plant Layout
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Ethanol Tank FireEthanol Tank Fire
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Explosion Prevention
� Ventilation
� Inert Gas Blanketing / Purging
� Grounding & Bonding
� Flame Arresters
� Control of electric equipment
� Plant Layout
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Fire/Explosion Prevention?Fire/Explosion Prevention?
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Grounding CablesGrounding Cables
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Explosion Prevention
� Ventilation
� Inert Gas Blanketing / Purging
� Grounding & Bonding
� Flame Arresters
� Control of electric equipment
� Plant Layout
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Flame Arresting Trash Container
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Explosion Prevention
� Ventilation
� Inert Gas Blanketing / Purging
� Grounding & Bonding
� Flame Arresters
� Control of electric equipment
� Plant Layout
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Loss of Electrical IntegrityLoss of Electrical Integrity
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Explosion Prevention
� Ventilation
� Inert Gas Blanketing / Purging
� Grounding & Bonding
� Flame Arresters
� Control of electric equipment
� Plant Layout
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FurnacesQuench
Offspec
Waste WaterControl
Building
Amine
Caustic WashCG
Compressor
CG Dryers
Deethanizers
AC Reactors
Coproducts
Refrigeration
Compressors
Expanders
Demethanizer
Chilling &
Expander
C2
Splitter
Product Storage
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Explosion Protection
�� VentingVenting
�� SuppressionSuppression
�� Building ConstructionBuilding Construction
�� Building LocationBuilding Location
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What was lacking here?What was lacking here?
Designed Explosion Relief Panels
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Reference MaterialReference Material
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Knowledge BaseKnowledge Base
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Books and JournalsBooks and Journals
“A High price has been paid “A High price has been paid
for this information: people for this information: people
killed and billions of dollars killed and billions of dollars
worth of equipment worth of equipment
destroyed. We get this destroyed. We get this
information for the price of information for the price of
the book. It will be the the book. It will be the
best bargain ever made, if best bargain ever made, if
we use this information to we use this information to
prevent a similar incident”prevent a similar incident”
Trevor Kletz from his book Trevor Kletz from his book
“What went Wrong?”“What went Wrong?”
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Fires and Explosions: Fires and Explosions:
What You Need to Know to What You Need to Know to
Prevent ThemPrevent Them
CSChE PSM SymposiumCSChE PSM Symposium
Edmonton, AlbertaEdmonton, Alberta
20072007
Gerry Phillips, GC Phillips Consulting Ltd.Gerry Phillips, GC Phillips Consulting Ltd.
Norman Nibber, Independent Risk ControlNorman Nibber, Independent Risk Control