There are 4 main categories of ignition sources. These include: Thermal, Electrical, Mechanical and Chemical.

Some examples of Thermal ignition sources include:

Flames:

• Blow torch
• Welding Flame
• Cigarette lighter
• Stove
• Piolet Light

Hot Surfaces

• Soldering Iron
• Electric Lamp
• Cigarette but
• Hot slag
• Glowing ember

Some examples of Electrical Ignition Sources

Electrical Current

• Electric motor
• Electric Switches
• Cable Break
• Spark produced under short circuit or other fault conditions

Electrostatic Charge

• Pneumatic Conveying of Solid
• Flow of liquid in pipeline
• Rubbing of plastic or rubber
• Liquid spray generator
• Powder flow

Lightning

• Direct strike
• Induced Voltage

Stray current

• Arc Weld

Some examples of Mechanical Ignition sources

Friction heat

• Abrasive wheel
• Bearing
• Jamming of material
• Piston movement

Materials Fracture

• Cracking of metal

Some examples of Chemical ignition sources

Exothermic reactions

• Vigorous oxidising reactions
• Exothermic Polymerisation
• Exposing pyrophoric Substances (sodium metal) to air.

All shall be documented how to avoid.

Keep up good work.

Arpad
exprofessional.com

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