Friday, 4 October 2013

CAUSES OF FIRE HAZARDS


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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