Ignition Sources

Playing cards illustrating potential sources of uncontrolled ignition of flammable atmospheres (gases, vapours, dusts or mists) from EN 1127-1Explosive atmospheres — Explosion prevention and protection“:

  • Hot surfaces
  • Flames and hot gases (including hot particles)
  • Mechanically generated sparks
  • Electrical apparatus
  • Stray electric currents, cathodic corrosion protection
  • Static electricity
  • Lightning
  • Radio Frequency (RF) Electromagnetic waves
  • Electromagnetic waves
  • Ionizing radiation
  • Ultrasonics
  • Adiabatic compression and shock waves
  • Exothermic reactions, including self-ignition of dusts
Images © Process Safety Integrity


Bowties can be used to identify, evaluate & manage potential ignition sources.

Fire & Explosion Bowties

This is summarised in our Visualizing Explosive atmosphere Scenarios & Tracking barrier Assurance (VESTA™) methodology video below:

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