SPONTANEOUS COMBUSTION:
These
are rare but can happen. It happens by self-heating (increase in temperature due to exothermic internal combustion).
HYPERGOLIC REACTIONS:
It includes
pyrophor hypergolic fuels. It occurs when mixing fuels. Oxidizers produce such
a rapid heat buildup, causing immediate combustion.
MISHANDLING FLAMMABLE LIQUIDS ANG
GASES:
They should be
handled with care because any shock can increase its internal molecular kinetic
energy causing increase in temperature.
NATURAL AND GENERATED ELECTRICITY:
Electrical
lines & equipment cause fires by a short circuit that provides a spark, by
arcs, or resistance heat. Lightning strikes start many fires every year.
HEAT FROM HOT SURFACES:
Irons in textile manufacturing &
dry-cleaning, coffee pots space heaters, hotplates, etc., all create hot
surfaces. Boilers, steam equipment, radiators, pipes, flues/chimneys. Surfaces
exposed to direct sunlight become hot surfaces.
ENGINES AND COMPRESSORS:
Engines
produce heat, especially in exhaust pipes. Compressors produce heat through
friction, transferred to their housings.
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