EXPLOSIONS FDY 493 Jim Cleary EXPLOSIONS • Overview: • What is an explosion? • What can fuel an explosion? • Explosion effects • Protection from explosions • Case studies.
Download ReportTranscript EXPLOSIONS FDY 493 Jim Cleary EXPLOSIONS • Overview: • What is an explosion? • What can fuel an explosion? • Explosion effects • Protection from explosions • Case studies.
FDY 493 Jim Cleary
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Overview:
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What is an explosion?
What can fuel an explosion?
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Explosion effects Protection from explosions
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Case studies
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What is an explosion?
• Rapid combustion in a confined space • Requires fuel, oxidizer and ignition source • Rapid combustion causes container to rupture
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What can fuel an explosion?
• Flammable liquid vapours • Chemical explosives • Flammable gases
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Explosion effects
• Fireball • Ignition of nearby combustibles • Pressure wave • Damage to building and equipment • Injuries or fatalities • Shrapnel • Same as for pressure wave
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Protection from explosions
• Explosion venting – most common • Must be done in accordance with NFPA 68 • Explosion suppression • Very expensive
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Protection from explosions
• Containment • Requires very strong vessels • Inerting • Common for chemical reactor protection
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Case studies
• Pepcon • Oppau • Texas City • Port Chicago • Halifax
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Class work:
• Research the case studies noted above • Wikipedia has fairly good articles on all of them • Review the requirements of Chapter 5 of NFPA 68 • Note well the formula for calculating how much explosion vent area is required • NFPA 68 is available electronically in MySeneca from the library • Do the self-test located in MySeneca
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• Discussion • I’ll be available to do an online chat to discuss the material on the web page and in this presentation • Go to MySeneca, then Communication, then Collaboration, then April 25 Virtual Classroom (click ‘join’).