Imperial Sugar Final 20
Post on 12-Nov-2014
5.235 views
Embed Size (px)
DESCRIPTION
U.S. Chemical Safety Board's report on the Imperial Sugar plant blast in Georgia that killed 14 people.TRANSCRIPT
U.S. C H E M I C AL S AF E T Y AN D H A Z AR D I N V E S T I G AT I O N B O AR D
INVESTIGATION REPORTSUGAR DUST EXPLOSION AND FIRE(14 Killed, 36 Injured)
oe
d
U
nt
il
10
rg
am
ba
onIMPERIAL SUGAR COMPANYPORT WENTWORTH, GEORGIA FEBRUARY 7, 2008
Em
KEY ISSUES: COMBUSTIBLE DUST HAZARD RECOGNITION MINIMIZING COMBUSTIBLE DUST ACCUMULATION IN THE WORKPLACE EQUIPMENT DESIGN AND MAINTENANCE
9. 24Report No. 2008-05-I-GA September 2009
.2
00 9
Draft Report
ContentsEXECUTIVE SUMMARY ..........................................................................................................................1 1.0 INTRODUCTION ...........................................................................................................................3 1.1 1.2 1.3 Background......................................................................................................................... 3
Imperial Sugar Company .................................................................................................... 6 1.3.1 1.3.2 Corporate Governance............................................................................................ 6 Corporate and Facility Management ...................................................................... 7
1.4
Facility Description............................................................................................................. 8 1.4.1 1.4.2 1.4.3 1.4.4 1.4.5 Granulated Sugar Storage Silos............................................................................ 10
Bosch Packing Building ....................................................................................... 15
Sugar Spillage and Dust Control .......................................................................... 17
2.1 2.2 3.0
Explosions and fires.......................................................................................................... 19
3.1 3.2 3.3
Combustible Dust Characteristics..................................................................................... 22
The Port Wentworth Incident............................................................................................ 27
ba
Em
3.4
3.5 3.6
rg
3.3.1 3.3.2 3.3.3 3.3.4 3.3.5
Ignition Sources ................................................................................................................ 35 3.4.1 3.4.2 Open Flames and Hot Surfaces ............................................................................ 35 Ignition Sources Inside the Steel Belt Enclosure.................................................. 36
Worker Training ............................................................................................................... 37 Hazards Management ....................................................................................................... 39
oe
Combustible Dust Explosions........................................................................................... 26
Pre-explosion Sugar Dust Incident History .......................................................... 28 Steel Belt Conveyor Modifications ...................................................................... 29 Primary Event Location........................................................................................ 29 Primary Event Combustible Dust Source ............................................................. 32 Secondary Dust Explosions .................................................................................. 34
d
U
INCIDENT ANALYSIS................................................................................................................ 22
nt
il
Emergency Response ........................................................................................................ 21
Draft Report
10
2.0
INCIDENT DESCRIPTION..........................................................................................................19
am
South Packing Building ........................................................................................ 16
on
Silos 1 and 2 Steel Conveyor Belt ........................................................................ 14
9. 24
.2
00 9i
Investigative Process........................................................................................................... 5
3.6.1 3.6.2 3.6.3 3.6.4 3.7
Evacuation, Fire Alarms, and Fire Suppression ................................................... 39 Electrical Systems Design .................................................................................... 40 Sugar Dust Handling Equipment.......................................................................... 44 Housekeeping and Dust Control........................................................................... 45
Dust Explosion Hazard Awareness................................................................................... 47 3.7.1 3.7.2 Imperial Sugar Management and Workers ........................................................... 47 Property Risk Insurers .......................................................................................... 51
4.0
REGULATORY ANALYSIS........................................................................................................53 4.1 4.2 Georgia Fire Codes ........................................................................................................... 53 Occupational Safety and Health Administration (OSHA) ................................................ 54
5.0
MODEL FIRE CODES..................................................................................................................56 5.1 5.2 National Fire Protection Association ................................................................................ 56 International Code Council ............................................................................................... 57
6.1 6.2 6.3 6.4 7.0 8.0 9.0 10.0
AIB International .............................................................................................................. 58
The Sugar Association ...................................................................................................... 59
PREVIOUS CSB DUST EXPLOSION INVESTIGATIONS.......................................................61 KEY FINDINGS: ..........................................................................................................................63
RECOMMENDATIONS...............................................................................................................66 10.1 10.2 10.3 10.4 10.5
Em
11.0
APPENDIX A INCIDENT EVENT SEQUENCE ..................................................................................71 APPENDIX B EXPLOSION PROGRESSION IN PACKING BUILDINGS ........................................ 80
ba
REFERENCES ..............................................................................................................................69
rg
Imperial Sugar Company .................................................................................................. 66 AIB International .............................................................................................................. 67 American Bakers Association........................................................................................... 68 Risk Insurance Management Society, Inc......................................................................... 68 Zurich Services Corporation ............................................................................................. 68
oe
INCIDENT CAUSES ....................................................................................................................65
d
U
nt
il
Sugar Industry Technologists ........................................................................................... 60
Draft Report
10
American Bakers Association........................................................................................... 59
am
6.0
TRADE ASSOCIATIONS ............................................................................................................58
on
9. 24
.2
00 9ii
FiguresFigure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. West bucket elevator tower; silos 3, 2, and 1; and south packing building............................... 4 Imperial Sugar Company organization prior to the incident ..................................................... 7 Port Wentworth, Georgia, organization prior to the incident ................................................... 8 Imperial Sugar facility before the explosion. ............................................................................ 9 Packing buildings first floor plan........................................................................................... 11 Silo tunnel and conveyor plan ................................................................................................. 12 Granulated sugar supply and discharge through the silos ....................................................... 13 Granulated sugar steel conveyor belts above the silos, circa 1990 ......................................... 14 Silo tunnel steel conveyor belt ...............................................................................
