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Comprehensive Overview of Explosion Suppression Techniques and Applications

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Explosion suppression is a critical safety measure in industries handling flammable materials. Initially developed for aircraft fuel tanks in the 1940s and later for enclosed industrial vessels in the 1950s, these systems protect against hazardous dust and gas explosions. Explosion suppression can effectively control deflagrations while being ineffective against detonation scenarios involving high explosives. This overview delves into the mechanics of suppression agents, system components like detection systems and control panels, and common applications in grain and coal handling, ensuring safety and prevention of catastrophic events.

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Comprehensive Overview of Explosion Suppression Techniques and Applications

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  1. Explosion Suppression • NFPA 69 • initially for aircraft fuel tanks (1940’s) • industrially (1950’s) • to protect enclosed vessels/containers • often against dust explosions

  2. Explosion Suppression Detonations • fuel that contains own oxidizer • high explosive • munitions etc. • velocity of flame front > speed of sound • explosion suppression won’t work

  3. Explosion Suppression Deflagrations • fuel oxidant mix • velocity of flame front < speed of sound • black powder, • dust explosions • gas leaks • suppression is possible

  4. Explosion Suppression Alternatives or Enhancements • control oxidant concentration (inert gas) • control fuel concentration (ventilation) • stronger containers • explosion relief venting • process isolation

  5. Explosion Suppression How explosion suppression agents work • agent introduce early • absorb energy, or • inhibit chain reactions, or • dilute reactants • see fig. 9-1

  6. Explosion Suppression Components Container • refillable • pressurized with N2 • mounted directly on vessel (no piping) • usually multiple containers

  7. Explosion Suppression Components Detection system • Ultra Violet (flame) • rate of rise pressure • Products of combustion • Infra Red (heat)

  8. Explosion Suppression Components Control panel • can handle multiple systems • nothing unusual

  9. Explosion Suppression Applications • aerosol fill rooms • grain handling • coal handling • other dusts

  10. Explosion Suppression Sequence 1. Mixture ignites 2. Pressure rised 3. Detector senses change, notifies panel 4. Panel initiates discharge, closes isolation valves 5. Flame front halted

  11. Explosion Suppression 6. Deflagration extinguished 7. Suppression ceases 8. Agent replaced, system back in service

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