combustible dust nep presentation_spi_march25_2010 rev

8/9/2019 Combustible Dust NEP Presentation_SPI_March25_2010 Rev

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Combustible Dust

National Emphasis ProgramIgnition Source

March 25, 2010

Ignition Source

Confinement

!"gen in #ir$!i%i&ers

Dispersion

Combustible Dust

Deflagration

Explosion

'I(E


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)er)ie*

+ istor" of Combustible Dust Inci%ents

+ a&ar% Mitigation -echni.ues

+ Combustible Dust NEP


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Catastrophic Combustible Dust Inci%entssince 15


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Mal%en Mills

Methuen, M#December 11, 15

/ In3ure%

N"lon 'iber

Combustible Dust E!plosions istor"


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'irefighting efforts follo*ing the e!plosion at

Mal%en Mills 4Methuen, Massachusetts,

December 11, 156


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8ahn 'oun%r"

Springfiel%, M#

'ebruar" 27, 1/ %ea%

In3ure%

Phenolic resin %ust


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Ma" 17, 2002

(ouse Pol"merics9ic:sburg, MS

5 %ea%, in3ure%

(ubber Dust


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+ 8anuar" 2, 200/ inston,NC? Si! %eaths, %o&ens of

in3uries? 'acilit" pro%uce%

rubber stoppers an%other pro%ucts for

me%ical use? Plastic po*%er

accumulate% abo)esuspen%e% ceiling

ignite%


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=est Pharmaceutical facilit" %estro"e% b" pol"eth"lene %ust


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+ 'ebruar" 20, 200/ ? C-# #cousticsCorbin, >@? Se)en =or:ers %ie%

? 'acilit" pro%uce%

fiberglass insulationfor automoti)ein%ustr"

? (esin accumulate%

in pro%uction areaan% *as ignite%


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httpA$$***6csb6go)$c

omplete%Bin)estigati

ons$%ocs$CS'inal(ep

ortC-#6p%f
http://www.csb.gov/completed_investigations/docs/CSBFinalReportCTA.pdfhttp://www.csb.gov/completed_investigations/docs/CSBFinalReportCTA.pdfhttp://www.csb.gov/completed_investigations/docs/CSBFinalReportCTA.pdfhttp://www.csb.gov/completed_investigations/docs/CSBFinalReportCTA.pdfhttp://www.csb.gov/completed_investigations/docs/CSBFinalReportCTA.pdfhttp://www.csb.gov/completed_investigations/docs/CSBFinalReportCTA.pdfhttp://www.csb.gov/completed_investigations/docs/CSBFinalReportCTA.pdfhttp://www.csb.gov/completed_investigations/docs/CSBFinalReportCTA.pdf


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Imperial Sugar

Port =ent*orth, eorgia

14Killed

Many Hospitalized

February 7, 2!


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-"pes of Dust In)ol)e% in inci%ents


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-"pes of In%ustries In)ol)e% in Dust Inci%ents


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#e$initions and %er&inology

+ 'o&bustible #ust+ 'o&bustible (articulate Solid

+ Hybrid Mixture

+ 'lass II )ocations

+ #e$lagration

+ #etonation

+ Explosion

+ Mini&u& Explosible 'oncentration *ME'+

+ )oer Fla&&able )i&it *)F)+

+ -pper Fla&&able )i&it *-F)+

+ Mini&u& Ignition %e&perature *MI%+

+ Mini&u& Ignition Energy *MIE+


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.F(/ 06 *22+, and 466 *24+ #e$initions

? Combustible Dust. /ny $inely di"ided solid &aterial 42 &icronsor less in dia&eter *i3e3, &aterial passing troug a -3S3 .o 4

Standard Sie"e+ tat presents a $ire or explosion azard endispersed

1 micron 4

F 160 ! 100m F 160 ! 104cm F 160 ! 108mm

20

F 20 ! 10


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Standard Sie"e Sizes

Sie"e .u&ber Sie"e opening*9&+

4 42

0 2

! 1!

1 1

2 7

28 08

82 4

4 8!


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(article Size o$ 'o&&on Materials


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Increase o$ Sur$ace /rea

Surface #rea Increases *ith increasing sub%i)ision

Figures Source: #ust Explosions in te (rocess Industries, Second Edition, ;ol$ K Ec


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'o&bustion ;ate Increase

'o&bustion ;ate Increases it Increasing Subdi"ision

Slo* Combustion 'ast Combustion Deflagration$E!plosion

SourceA Dust E!plosions in the Process In%ustries, Secon% E%ition, (olf > Ec:hoff


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#e$lagration =s3Explosion

Deflagration3(ropagation o$ a co&bustion zone at a speed tatis less tan te speed o$ sound in te unreacted &ediu&3

Detonation3 (ropagation o$ a co&bustion zone at a "elocitytat is greater tan te speed o$ sound in te unreacted&ediu&3

Explosion. %e bursting or rupture o$ an enclosure or acontainer due to te de"elop&ent o$ internal pressure $ro&

de$lagration3

Explosion

Deflagration

Detonation



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2/ SourceA Dust E!plosions in the Process In%ustries, Secon% E%ition, (olf > Ec:hoff

E!plosible (ange

Dust

Deposit

E!plosible

(ange

I

(ange

10


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2

Dust 'ire$E!plosion

'o&bustible #ust >xygen in /ir

Ignition Source

#ispersion 'on$ine&ent

ExplosionFI;E

#e$lagration


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-he K-"picalL E!plosion E)ent

ProcessE.uipment

InitialInternal

Deflagration

-ime, msec60 25 50 5 100 125 150 15 200 225 250 /00 /25


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ProcessE.uipment

InitialInternal

Deflagration

Shoc: =a)e

-ime, msec60 25 50 5 100 125 150 15 200 225 250 /00 /25


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2


ProcessE.uipment

InitialInternal

Deflagration

Elastic (eboun%

Shoc: =a)es

-ime, msec60 25 50 5 100 125 150 15 200 225 250 /00 /25


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2;


-ime, msec60 25 50 5 100 125 150 15 200 225 250 /00 /25

Process

E.uipment

InitialInternal

Deflagration

Dust clou%s cause%

b" Elastic (eboun%


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ProcessE.uipment

Containment'ailure from Initial

Deflagration

Dust Clou%s Cause%

b" Elastic (eboun%

-ime, msec60 25 50 5 100 125 150 15 200 225 250 /00 /25


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Process

E.uipment

Secon%ar" Deflagration

Initiate%

Dust Clou%s Cause%

b" Elastic (eboun%

-ime, msec60 25 50 5 100 125 150 15 200 225 250 /00 /25


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ProcessE.uipment


Propagates through Interior

-ime, msec60 25 50 5 100 125 150 15 200 225 250 /00 /25


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ProcessE.uipment


9ents from Structure

-ime, msec60 25 50 5 100 125 150 15 200 225 250 /00 /25


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Causes Collapse an% (esi%ual 'ires

-ime, msec60 25 50 5 100 125 150 15 200 225 250 /00 /25

Diagrams Courtes" of 8ohn M6 Cholin, P6E6, 'S'PE, 86M6 Cholin Consultants, Inc6


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a&ar% Mitigation


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Hazard Mitigation

Dust controlIgnition source control

E!plosion Pre)ention


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#ust 'ontrol

Design of facilit" process e.uipment

Contain combustible %ust

Clean fugiti)e %ust(egular program

#ccess to hi%%en an%

o)erhea% areasSafe cleaning metho%s


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Ignition Source 'ontrol

Electrical e.uipmentStatic electricit" control

Mechanical spar:s friction

pen flame controlDesign of heating s"stems heate%

surfaces

Gse of tools, )ehicles


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Explosion (re"ention

+ >xidant 'oncentration ;eduction+ #e$lagration =enting

+ #e$lagration (ressure 'ontain&ent

+ #e$lagration Suppression Syste&s+ Isolation o$ e?uip&ent


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>SH/ Standards@'itations

Includes:

+ =entilation Standard+ House


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(artial )ist o$ ;ele"ant .F(/ Standards

NFPA

Number

Title

61 Prevention of Fires and Dust Explosions In Agricultural

and Food Products Facilities

68 enting of Deflagrations

6! Explosion Protection "#stems

$% National Electrical &ode

$$ 'ecommended Practice on "tatic Electricit#

86 (vens and Furnaces

)8) "tandard for &ombustible *etals+ *etal Po,ders+ and *etal Dusts

466 'ecommended Practice for t-e &lassification of &ombustible Dusts and(f .a/ardous 0&lassified 2ocations for Electrical Installations in &-emical Process Areas

04 Prevention of Fire and Dust Explosions From t-e *anufacturing+ Processing+ And.andling of &ombustible Particulate "olids

004 Prevention of Fires and Explosions in 3ood Processing and 3ood,or4ing Facilities


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Inspections Con%ucte%


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-"pes of In%ustries Inspecte% b"

Percent


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In%ustries Inspecte% un%er NEP


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-otal 9iolations Issue%


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Inspections In =iolations A 'losed+


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Combustible Dust (elate%


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Combustible Dust (elate%

9iolations


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;

Some Combustible Dust NEP 'in%ings

1. Hazardous levels of dust accumulations in the workplacesdue to poor housekeeping practices.

2. Electrical equipment and Powered Industrial Trucks notapproved for locations handling comustile dusts

!. "ust collectors were located inside uildings withoutproper e#plosion protection s$stems% such as e#plosionventing or e#plosion suppression s$stems.

&. "e'agration isolation s$stems were not provided toprevent de'agration propagation from dust handling

equipment to other parts of the plant.

(. The rooms with e#cessive dust accumulations were notequipped with e#plosion relief venting distriuted overthe e#terior walls and roofs of the uildings.


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). The horizontal surfaces such as eams% ledges and screwconve$ors at elevated surfaces were not minimized toprevent accumulation of dust on surfaces.

*. +ir from the dust collector was rec$cled through ductwork

ack into the work area.

,. -agnetic separators and tramp metal separators werenot installed or not functioning to prevent foreignmaterial process stream and potentiall$ cause a spark

. E#plosion vents on ucket elevatior/s0 and dust collectorswere directed into work areas and not vented to a safe%outside location awa$ from platforms% means of egress% orother potentiall$ occupied areas


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1. Equipment /such as grinders and shakers0 were notmaintained to minimize escape of dust into thesurrounding work area.

11. "uctworks used in transporting comustile dust werenot constructed of metal /conductive0 and were notonded or grounded to minimize generation andaccumulation of static electricit$.

12. Hot work /open 'ame or sparks from welding% cutting%grinding0 was performed in the comustile dust handlingareas without hot work procedures.


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161312 Hazard 'o&&unications 22 =iolations

1613147 )oc


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S# -raining

+ )er /50 compliance officers traine% on PSM

*ith combustible %ust being a component

+ 200 compliance officers ha)e recei)e% specificcombustible %ust training

+ #ppro!imatel" 100 state an% fe%eral

compliance officers recei)e% *ebinar refresher

training

S# Compliance #ssistance


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S# Compliance #ssistance(esourcesA Combustible Dust

+ Safet" an% ealth -opics Page

+ 'act Sheet

+ Poster

+ Safet" an% ealthInformation ulletin 42005

OSHAs Combustible Dust Poster
http://www.osha.gov/Publications/combustibledustposter.pdf


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'o&bustible #usts ;egulations Status5


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uestions5

combustible dust nep presentation_spi_march25_2010 rev

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