Dust Explosion
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Transcript of Dust Explosion
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Content Based Chemical Engineering
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NFPA Vent - HELP!
BASIS: NFPA 68 Standard on Explosion Protection by Deflagration Venting - 2007 Edition
NOTE: Always begin a new case by retrieving the original file. Direct entry of data in cells that originally contain tablelookups could cause functions to be lost, or incorrect calculations. I format cells requiring entry colored RED;calculated values are black.
RULES AND LIMITATIONS FOR NFPA 68 DUST MODELS:
Print out using direct EXCEL commands.
Consistent with GOOD ENGINEERING PRACTICE, the burden rests with the USERof these spreadsheets to review ALL calculations, and assumptions. The USER ISFULLY RESPONSIBLE for the results or decisions based on calculations.
This Spreadsheet Requires MACROS to be ENABLED to ASSURE proper operation.See the Workbook Help Sheet for Additional Instructions on Use.
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The originator of these spreadsheet(s) specifically excludes all warranties,expressed or implied, as to the accuracy of the data and other information setforth and assumes NO liability for any losses or damage resulting from the use ofthe materials or application of the data.
NFPA 68 Standard on Explosion Protection by Deflagration Venting - 2007 Edition
0.8 P0 1.2 bar-abs1 L/D 6
Allow partial volume1 L/D 6
(calculate vent duct effect last)
Print out using direct Excel commands. This application is provided by Chemical
No vent ductPanel density 40 kg/m2
Allow partial volume1 L/D 6
Elevated initial pressure
Partial volume
Allow vent ductPanel density 40 kg/m2
0.8 P0 1.2 bar-a
(calculate vent duct effect last)No vent duct
Panel density MT and 40 kg/m2
Panel inertia
Panel inertia
0.2 P0 4 bar-gFull volume deflagration
1 L/D 6(calculate elevated initial pressure effect last)
Vent ducts
0.8 P0 1.2 bar-absPanel density MT and 40 kg/m2
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Model Application
explosion dusts - NFPA Psafety January 2001
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NFPA 68 Standard on Explosion Protection by Deflagration Venting - 2007 Edition NFPA 68 Standard on Explosion Protection by Deflagration Venting 2007 Edition
1 Service: Project No: Date: 8/1/2009BR 549Dust Handling Collection1. Service: Project No: Date: 8/1/2009 BR-549 Dust Handling - Collection
2. Client: Equipment: Building 45 Baghouse Confidential2. Client: Equipment: Building 45 Baghouse Confidential
Equipment / System Specifics
3 D t
Equipment / System Specifics
PAPER DUST3. Dust:M t i U it I i l U it R f
PAPER DUSTMetric Unit Imperial Unit Reference
4. Pred: 3.522 bar-g 51.06 psig Maximum pressure developed during a vented deflagration4. Pred: 3.522 bar g 51.06 psig
5 P : 0 250 bar g 3 63 psig
p p g f g
Pressure that activates a vent closure5. Pstat: 0.250 bar-g 3.63 psig Pressure that activates a vent closure
6. Pmax: 8.000 bar-g 116.00 psig Maximum pressure developed in a contained deflagration6. Pmax: 8.000 bar g 116.00 psig
7 V 25 00 t 882 77 ft
Maximum pressure developed in a contained deflagration
Volume of equipment being analyzed7. V: 25.00 cu meter 882.77 cu ft Volume of equipment being analyzed
8. L/D Ratio: 4.00 Ratio of height -to- diameter8. L/D Ratio: 4.00
9 K 200 b /
Ratio of height to diameter
D fl ti i d f d t l d9. Kst: 200 bar-m/sec Deflagration index of a dust cloud
8.2.2 - Venting by Means of Low-Inertia Vent Enclosures .. for Enclosures L/D 2 & L/D