Post on 27-Dec-2015
transcript
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Module 5
Damage Control
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Terminal Objectives
Upon the successful completion of this module, participants will be able to describe methods used to prevent or control damage from a combustible dust explosion.
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Enabling Objectives
• Discuss types of damage control systems.
• Discuss emergency response planning.
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Damage Control Systems
• Monitoring/suppressing/eliminating dust
• Various types of systems– Spark ember detection– Extinguishing– Hazards separation/segregation– Deflagration venting– Pressure relief venting– Specialized fire suppression
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Spark Ember Detection
• Eliminate early causes of fires/explosions
• Detects spark/ember IR radiation• Fire prevention method
– Dust collectors– Pneumatic conveying systems
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Spark Ember Detection
• System activates countermeasures– Deluge valves– Abort gates– Alarm systems– Automatic machinery shutdown– Extinguishing devices
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Extinguishing System
• Releases fine mist of water• Sparks/embers extinguished without
interrupting production• Greatly reduces
– Personnel injury– Equipment damage– Downtime
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Hazard Separation
• Isolates combustible dust hazard• Puts distance between dust and
hazard• Implement system during
design/remodeling
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Hazard Segregation
• Used when separation is not possible• Isolates hazard by using a barrier• Implementation without burdening
entire plant/building
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Deflagration Venting
• Controls damage caused by explosions
• Vents release expanding gases• Gases reduce pressure below danger
levels
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Pressure Relief Venting
• Same premise as deflagration venting
• Provides pressure relief to prevent explosions
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Specialized Fire Suppression Systems
• Sprinklers– Most standard form of fire suppression– Heat activated
• Carbon Dioxide– Will not damage electronic equipment– Reduces oxygen levels
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Dry Powder Extinguishers
• Standard/Multi-purpose– Safe for most kinds of fires
• “Knocks down” the flames• Best for fires with flammable
liquids/gases
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Deluge Foam
• System is connected to a water supply– Valve opened by smoke/heat detection
system
• Used in high hazard areas– Chemical storage– Processing facilities
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Emergency Response Planning
• Requires detailed planning• 3 phases of planning
1. Pre-explosion2. Dust explosion3. Post explosion
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Pre-Explosion
• Develop Emergency Action Plan (EAP)
• Take special consideration for combustible dust
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Dust Explosion
• Implement EAP• Evacuate area• NOT incipient fire
– Explosions can be initiated by incipient fire
– Ignited materials can travel
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Dust Explosion
• Incipient fire brigades– Limited training– Typically hose streams– PPE
• Categorized as fully involved fire– Fire department response– Specialized training
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Post-Explosion
• Initiate investigation when safe– Most evidence is destroyed– Only 50% of cases determine cause– Collect any dust samples
• Change in working environment– Paranoia, fear, and stress– Perceived risk– apprehension
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Post-Explosion
• Increased interest– Community– Regulatory industries
• Communication from organization– Public relations– Choosing a speaker
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Post-Explosion
• Resuming normal operations• Recovery
– Rebuilding with safety in mind– Strong leadership/direction needed
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Next Module
Module 6: Facility Dust Assessment