in case of hydrogen fire what is chemistry is there?In that fire firefighter what have to do?

Question

For fighter

Answer 1

Heat, open flames, electrical sparks, and static electricity easily ignite hydrogen. It will burn with a pale blue, almost invisible flame. Most hydrogen fires will have the flame characteristic of a torch or jet and will originate at the point where the hydrogen is discharging. If a leak is suspected in any part of a system, a hydrogen flame can be detected by cautiously approaching with an outstretched broom, lifting it up and down. The most effective way to fight a hydrogen fire is to shut off the flow of gas. If it is necessary to extinguish the flame in order to get to a place where the flow of hydrogen can be shut off, a dry powder extinguisher is recommended. However, if the fire is extinguished without stopping the flow of gas, an explosive mixture may form, creating a more serious hazard than the fire itself should re-ignition occur from the hot surfaces or other sources. The usual fire fighting practice is to prevent the fire from spreading and let it burn until the hydrogen is consumed. Dry powder fire extinguishers should be available in the area. A fire blanket should be conveniently located. An adequate water supply should be available to keep surrounding equipment cool in the event of a hydrogen fire. The local fire department should be advised of the nature of the products handled and made aware of the best known methods for combating hydrogen fires.


Personal Protective Equipment (PPE)
One must be thoroughly familiar with the properties and safety precautions before being allowed to handle hydrogen and/or associated equipment.
Full face shield, safety glasses, insulated or leather gloves, long-sleeved shirts, and pants without cuffs should be worn when working on liquid hydrogen systems. Pant legs should be worn outside of boots.
In the event of emergency situations, a fire-resistant suit and gloves should be worn. SCBA is also recommended, but remember atmospheres that are oxygen-deficient are within the flammable range and should not be entered.

Answer 2

For Hydrogen fire you need, Hydrogen, Oxygen and minimum source of igniter(heat energy).

Experimentally a glowing match will ignite in the presence oxygen.

Under certain condition you may need only Hydrogen and Oxygen.

Chemistry:

The product produced will be water or H2O, and noise of explosion.

Say there are 10 canisters of Hydrogen and one starts to leak and conditions are right (some kind of sparking), you will have one explosion, and chances are that other material will catch fire. Before some one can say oops, depending on the positions of other canisters you will hear other few explosion but maximum total 10, if there is nothing else in the building then in 2 minute or so depending on the building you will have final explosion (wood gives out lots of methane which then can explode, painted surfaces can catch fire or gases given out from these can explode also). A steel building will melt in some places due to heat.

Firefighter try to protect surrounding building by watering the structure.

Evacuate the area.

If they arrive in time they can try to isolate or foam or water down and keep cool whatever they can (this is not very likely), so they just watch it burn down, and start puting out the fire, they do not want to be near any unexploded canisters.