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Fri, October 31, 2014,22:26

Hydrogen Sulfide fire fighting

EMERGENCY OVERVIEW: EXTREMELY FLAMMABLE GAS. Forms explosive mixtures with air over a wide concentration range. Very low ignition energy. Gas is heavier than air and may hug the ground. Distant ignition and flashback are possible. During a fire, irritating/toxic sulfur dioxide may be generated. Confined space hazard. Can accumulate in confined spaces, especially in low-lying, poorly ventilated areas, producing a fire/toxicity/explosion hazard.
 

H2S FIre and explosion data

Flash pint Flamable gas
Autoignition260oC(500oF)
Flammable rangeLEL:4.0% ;  UEL: 44.0%
Hazardous combustion products Oxides of sulfur
                  
Extinguishing media : Extinguish Hydrogen Sulfide fires by shutting-off the source of the gas. Use water spray to cool fire-exposed containers, structures, and equipment. Other appropriate extinguishing media are dry chemical, foam, and carbon dioxide.
Special fire-fighting procedures: Evacuate all personnel from area. If possible without risk, shut off source of gas, and then fight fire according to types of materials burning. Extinguish fire only if gas flow can be stopped. This will avoid possible accumulation and reigniting of a flammable gas mixture. Keep adjacent cylinders cool by spraying with large amounts of water until the fire burns itself out. For small releases, if it is not possible to stop the leak, and it does not endanger personnel, let the fire burn itself out. Incipient fire responders should wear eye protection. Structural fire fighters must wear Self-Contained Breathing Apparatus and full protective equipment, including fire resistant clothing. Large fires should be fought from a distance with an unmanned hose holder or monitor nozzles. If this product is involved in a fire, fire run-off water should be contained to prevent possible environmental damage. If necessary, decontaminate fire-response equipment with soap and water solution.
Unusual fire and  explosion hazards: Most cylinders are designed to vent contents when exposed to elevated temperatures. Pressure in a cylinder can build-up due to heat and it may rupture if pressure relief devices should fail to function. An extreme explosion hazard exists in areas in which the gas has been released but the material has not yet ignited.
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