FLAMPROOF (EXPLOSION-PROOF) PROTECTION (Ex ‘d’)

• Maximum gaps and flame path for gas groups depends on ignition energies of the gas / vapour and the volume of the enclosure

• For example, for IIB gas group, for 100 Cubic cm volume, for flanged joints:

  • Flame Path - 6 mm
  • Maximum Gap - 0.3 mm

• For II C Hydrogen, 100 cubic cm volume, for flanged joints:

  • Flame path - 9.5 mm
  • Maximum Gap - 0.1 mm

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