2010 Sfpe Cpd On Explosion Venting

Andrew W. Wong MBA, CFIFireE, CFEI, CFII, CCFI April 13, 2010 Explosion Venting for Low & High-Strength Enclosures Toronto Chapter

Applicable Law ,[object Object],[object Object],[object Object]

Changes to NFPA 68 - 2007 ,[object Object],[object Object],[object Object],[object Object],[object Object]

Low Strength Enclosures ,[object Object],[object Object]

Enclosure Strength [P es ] ,[object Object],[object Object],[object Object],[object Object]

Enclosure Strength [P es ] ,[object Object],[object Object]

Deflagration Index ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Maximum Pressure [P max ] ,[object Object]

Reduced Pressure [P red ] ,[object Object]

Static Activation Pressure [P stat ] ,[object Object]

Reduced-shank machine bolt installed to fail in shear.

Collapsing washer used with a single-layer panel.

Fire Rated Blast-Resistant Door

Ministry of Labour Engineering Data Sheet #4-01 ,[object Object],[object Object]

Ministry of Labour Engineering Data Sheet #4-01 ,[object Object]

Problem #1 ,[object Object],[object Object]

Answer to Problem #1 ,[object Object],[object Object],[object Object],[object Object]

Factory Mutual Global Property Loss Prevention Data Sheet #1-44 ,[object Object],[object Object],[object Object],[object Object]

Problem #2 ,[object Object],[object Object],[object Object],[object Object]

Answer to Problem #2 ,[object Object],[object Object],[object Object],[object Object]

Answer to Problem #2 (cont’d) ,[object Object],[object Object],[object Object],[object Object],[object Object]

NFPA 68 ,[object Object],C (A s ) --------------- P red 1/2 A v =

NFPA 68 C (A s ) --------------- P red 1/2 A v = C = Venting equation constant P red = Maximum pressure developed in a vented enclosure during a vented deflagration

Assumptions of Equation ,[object Object],[object Object],[object Object]

Problem #3 ,[object Object],[object Object],[object Object]

--------------- P red 1/2 A v = C (A s ) A v = (0.17) (1560) / 0.5 ½ A v = 375 sq.ft.

NFPA 68 - Other design criteria ,[object Object],[object Object],[object Object]

Ontario Fire Code, O.Reg. 213/07 made under the Fire Protection and Prevention Act, 1997, as amended. High Strength Enclosures

Fire Code Requirements ,[object Object],[object Object],[object Object]

Combustible Dust Producing Process ,[object Object],[object Object]

Verification of Data - P stat ,[object Object],[object Object]

Verification of Data – P max & K St ,[object Object],100 9.0 Wood Grinding dust 144 8.9 Wood Chips/dust 149 8.9 Sawdust K St bar m/s P max bar Dust Type

Verification of Data - K St ,[object Object],[object Object],[object Object],[object Object],[object Object]

Verification of Data - P red ,[object Object],[object Object]

Verification of Volume ,[object Object],[object Object],[object Object]

Alternative Vent Area Methodology for Dusts ,[object Object],[object Object],[object Object]

Vent size calculation ,[object Object],[object Object]

Example Problem ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Model Answer ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Other Considerations 1. Classification of Hazardous Locations 2. Explosion Venting and Size of Fireball 3. Warning sign on Vent Closures 4. Automatic Sprinkler System

Existing Explosion Venting to the Outdoors ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Discharge of Deflagration (End slideshow to play wmv file)

Dust Explosion Inside Dust Collector Flame discharged from explosion vent Diameter of Fire Ball

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Fireball Diameter Calculation for Dust Explosion

Scenario ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Fireball Diameter Calculation for Gas Explosion

Scenario ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Warning Sign on Vent Closure WARNING: Explosion relief device. or As per ANSI Z535 Product Safety Signs and Symbols

2010 Sfpe Cpd On Explosion Venting

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2010 Sfpe Cpd On Explosion Venting