Steam smothering

Oxygen Depravation (steam smothering, inerting, foam sealing, CO2 application, etc.)... 

Snuffing Steam - Pressurized steam (water vapor) used to smother and inhibit fire conditions. 

For example, extinguishment of fire by water is accomplished by any or a combination of cooling, smothering from produced steam, emulsification of some liquids, and dilution. 

Indirect Application A method of extinguishing fire by applying water fog into a superheated atmosphere to obtain the maximum heat absorption and steam generation for smothering and cooling the fire area. 

If the house contains no combustible material, it will not burn. If the burning area could be tightly sealed, it would smother itself. This is the principle of foam extinguishers. We cannot reduce the temperature below the ignition point by blow-in the fire out, but we do have another way of reducing temperature. This is water. Every calorie of heat absorbed by the noncombustible water and steam removes that calorie of heat from the fire s ability to propagate itself. 

The fire risk is minimized by isolating the main storage tanks, providing a smothering steam supply to the inside of all tanks, and avoiding overheating of the fuel. Gas tar is burned like oil. It is particularly heavy and has a low flash-point, so that the temperature must be carefully adjusted. Its heat value is around 14,000 B.t.u. per pound. 

BARIUM SULFIDE (21109-95-5) BaS Flammable solid. Oxidizes in dry air. Contact with acid, acid fumes, moisture, steam, or moist air causes decomposition with the formation of toxic and flammable hydrogen sulfide gas. Evolved gas can form explosive mixtures with air and may cause spontaneous ignition or explosion. Violent reaction with strong oxidizers, calcium chlorate calcium nitrate chlorine dioxide phosphorus(V) oxide strontium chlorate strontium nitrate. Incompatible with lead dioxide, potassium chlorate, potassium nitrite may explode at elevated temperatures. On small fires, use smothering quantities of dry chemical powder, dry clay, dry groimd limestone (CaCOj), dry soda ash,dry sand or approved Class D extinguishers, do not use water, foam, or hydrous agents. 

YTTRIUM (7440-65-5) Y Flammable in the form of dust in air pyrophoric. Reacts with water, steam, releasing flammable hydrogen gas. Reacts with oxidizers, halogens strong acids strong bases peroxides. On small fires, use only approved Class D extinguishers (e.g., Met-L-X or Lith-X ), or smother with special G-1" powders, dry powdered talc, dry sand, dry clay, dry crushed limestone, dry graphite. 

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