Saturday 28 June 2014

How To Operate Fire extinguisher

How To Operate Fire Extinguisher:-

It is a very simple to operate a fire extinguisher , first of all we should Deside to which type of fire indicate then we should take appropriate Fire extinguisher And always know PASS  

P- Pull The Pin

A- Aim The Fire

S- Squeeze The Handle

S- Sweep The Nozzle Side to Side


Sunday 8 June 2014

Classification of Fire

. Classification of fires

 Internationally accepted classification of fires is as follows.


Class 'A'
These are fires involving solid materials normally of an organic nature (compounds of carbon), in which combustion generally occurs with the formation of glowing embers. Class A fires are the most common.  Effective extinguishing agent is generally water in the form of a jet or spray.

Class  'B'
These are fires involving liquids or liquefiable solids. For the purpose of choosing effective extinguishing agents, flammable liquids may be divided into two groups:

i) Those that are miscible with water, and ii) Those that are immiscible with water.

Depending on (i) and (ii), the extinguishing agents include water spray, foam, vapourising liquids, carbon dioxide and chemical powders.

Class 'C'
These are fires involving gases or liquified gases in the form of a liquid spillage, or a liquid or gas leak, and these include methane, propane, butane, etc. Foam or dry chemical powder can be used to control fires involving shallow liquid spills. (water in the form of spray is generally used to cool the containers.)

Class 'D'
These are fires involving metals. Extinguishing agents containing water are ineffective, and even dangerous. Carbon dioxide and the bicarbonate classes of dry chemical powders may also be hazardous if applied to most metal fires. Powdered graphite, powdered talc, soda ash, limestone and dry sand are normally suitable for class  D  fires. Special fusing powders have been developed for fires involving some metals, especially the radioactive ones. Presently special dry chemical powders have been developed for extinguishing metal fires.