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Explosion Suppression

Explosion Suppression. NFPA 69 initially for aircraft fuel tanks (1940’s) industrially (1950’s) to protect enclosed vessels/containers often against dust explosions. Explosion Suppression. Detonations fuel that contains own oxidizer high explosive munitions etc.

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Explosion Suppression

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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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