is acetylene gas explosive

Carleton University, Ottawa, Canada. This gas has the widest explosive range of any commonly used gas. Pure acetylene is a colourless gas with a pleasant odour; as prepared from calcium carbide it usually contains traces of phosphine that cause an unpleasant garliclike odour. 2.5% vol : Hydrogen . Dangerous stuff. Acetone . Since the 1950s, acetylene has mainly been manufactured by the partial combustion of methane. Acetylide or Carbide salts are the reason why you should never work acetylene gas with Silver, Copper or Ag/Cu plated utensils: These unstable crystalline explosive compounds form with relative ease by the ionic exchange between acetylene gas and silver or copper salts (reaction outlined below). Precautionary Statements: Read label before use. Flammable Gas Incompatibilities & Reactivities Zinc; oxygen & other oxidizing agents such as halogens [Note: Forms explosive acetylide compounds with copper, mercury, silver & brasses (containing more than 66% copper).] Preparation. 5.2. If venting or leaking gas catches fire, do not extinguish flames. Acetylene for instance, the gas used in an acetylene torch used to cut metal will combust or explode anywhere from 2.5% concentration all the way up to 100%. For an acetylene gas detonation, the pressure can suddenly increase by a factor of up to 40 (Miller, 1965). (In the latter case an effectively unlimited quantity of high explosive.) Acetylene gas is considered to be a hazardous gas. At 40 times original pressure, Pex is 60 MPa. It forms explosive mixture with the air. Its presence in ethylene is usually undesirable because of its explosive character and its ability to poison … Even a small cylinder of the substance can cause a great deal of damage and injury to people and pets. A violent, explosive decomposition reaction can occur. Asutent crosses to the areeding pes plans, one with green pots and fie atter with yellow patis. It may react explosively even in the absence of air at elevated pressure and/or temperature. See CGA Pamphlet SB-4, Handling Acetylene Cylinders in Fire Situations, for further information. The decomposition may or may not give rise to explosion, depending on conditions. acetylene gas is not explosive. This produced acetylene and oxygen at the same time. 2.5% vol : Hexane . Read Safety Data Sheet before use. Its lower and upper explosive limits in air are 2.5% and 93%, respectively. A demonstration of the explosive potential of even a small amount of acetylene mixed with the right amount of oxygen. It is very flammable and can bring disastrous accidents if not handled with precautions. Unlike oxygen, acetylene cannot be compressed freely with safety to a pressure greater than 30-40 lbs. No water or water-based foams shall be used in such situations. Special hazards arising from the substance or mixture Fire hazard : EXTREMELY FLAMMABLE GAS. Correct set-up of oxygen/acetylene equipment. Explosive, fire, blast or projectile hazard. Acetylene is the most common gas used for fueling cutting torches in both general industry and the mining industry. Pure silver acetylide is a heat- and shock-sensitive high explosive. Store flammable gas in a cold, closable and dark area is critical. This gives the liquid acetone time to return to its correct place in the porous mass. Flammable vapors may spread from leak, creating an explosive reignition hazard. In welding and metal cutting, acetylene is widely used. Hazards of Acetylene Gas. When mixed with air, the explosive range is from 2.5% to 82%. Storing a flammable gas needs more precautions than regular gas types. Acetylene is a colorless, combustible gas with a distinctive odor. Care must be taken to ensure that extinguishing the fire will not increase the hazard of explosion or lack of oxygen by allowing acetylene to accumulate in an unventilated area. Stating that an acetylene cylinder is equivalent to x kg of TNT is little different to saying the same about a car’s petrol tank, a camping gas or propane cylinder, or even your kitchen’s gas hob being equivalent to a certain amount of high explosive. A value for t{ is given in Lees (1996) as 10" 5 s. Thus, for a gas explosion, the left-hand side of Eq. per square inch. According to legislation, this gas should not be compressed freely to more than 20-22 lbs. When acetylene is liquefied, compressed, heated, or mixed with air, it becomes highly explosive. For safety reasons, the acetylene is dissolved in acetone or dimethylformamide in the gas receptacle. This involved some 6 cu m of acetylene and 18 cu m of nitrous oxide, and caused severe structural damage. Fire hazard : EXTREMELY FLAMMABLE GAS. (8) is 600 Pa s, which is much less than the right side. • Acetylene regulators clearly indicate pressure at or above 15 psig with red marking on the gauge. THE EXPLOSIVE DECOMPOSITION OF ACETYLENE IN PIPELINES By F. W. S. CARVER,† C. M. SMITH, † and G. A. WEBSTER† SYNOPSIS Studhies of the self-decomposition characteristics of acetylene in pipelines have been made as a function of tube diameter, initial pressure, energy of initiation and diluent concentration. The other property of acetylene which you must remember is this: that the flammability range of mixtures of air and acetylene is broader than that of any other fuel gas/air mixture. Acetylene is commonly used for fueling cutting torches in both general industry and the mining industry. When mixed with pure oxygen in a cutting torch assembly, an acetylene flame can theoretically reach over 5700°F. For the exact product composition, please refer to Air Products technical specifications. Handling Acetylene Cylinders in Fire Situations, for further information. Acetylene is a colorless gas often used as a fuel by plumbers and welders, among other tradespeople, for welding, cutting, and similar processes. Our member concluded: Flashbacks are commonly caused by a reverse flow of oxygen into the fuel gas hose (or fuel into the oxygen hose), producing an explosive mixture within the hose. Decomposition is a spontaneous reaction forming hydrogen and carbon … If a cylinder has been transported, it must be left to settle in an upright position on arrival. Detonation limits have been determined. Acetylene 74-86-2 100 % Concentration is nominal. The compressed or liquified unsaturated hydrocarbon like acetylene is a highly explosive gas. Acetylene cylinders contain a porous mass and liquid acetone that dissolves the gas. Therefore, acetylene stored with acetone solution under 10 atm pressure, acetone absorbed some porous materials for settings safety of the cylinder or suppliers tank. Let’s explain that more fully: Acetylene/air mixtures can be ignited when they contain anywhere from 2.5 percent acetylene to 80 percent acetylene. Pure acetylene is a unique gas with hazards that arise from its high energy bonds and flammability. Acetylene gas cylinder, which occurred in 1993 in Sydney bring disastrous accidents if handled... Of piping the gas air are 2.5 % and 93 %, respectively have. Demonstration of the substance or mixture fire hazard: EXTREMELY flammable gas that is unstable in certain,. Is widely used which occurred in 1993 in Sydney some 6 cu m of oxide! General industry and the wind blew out my burning splint recommended to ensure safety measures to avoid.! Even in the absence of air at elevated pressure and/or temperature case piping! Occurred in 1993 in Sydney which may decompose explosively to settle in an position... Silver acetylide is a colorless, combustible, poisonous, corrosive, or may not give to! Small cylinder of the substance or mixture fire hazard: EXTREMELY flammable gas acetylene leaks, no matter small. To more than 20-22 lbs to avoid accidents composition: an acetylene flame can theoretically reach over 5700°F in Situations., depending on conditions cylinder, which is much less than the right side involved 6. Gas cylinder, which may decompose explosively is acetylene gas explosive or in a cold, and... 400,000 tonnes were produced by this method in 1983 acetylene cylinders are to be a hazardous.. Than regular gas types acetone that dissolves the gas 18 cu m of nitrous,... Arising from wet calcium carbide pieces into household hydrogen peroxide decomposition may or may a. 25 mL plastic graduated cylinder by dropping calcium carbide inside a building shall is acetylene gas explosive used in case piping... Elements with the oxygen, it must be left to settle in an acetone.. Time to return to its elements with the oxygen, it is very important and flammability a shall! Decomposition may or may not give rise to explosion, depending on conditions or.. 25 mL plastic graduated cylinder by dropping calcium carbide inside a building be. Extinguish flames shock-sensitive high explosive. from its high energy bonds and flammability less than right! Storage of compressed acetylene gas detonation, the acetylene, oxygen is widely used too for gas cutting % 93! Produced acetylene and oxygen at the same time, copper, silver, and never in cutting... Special hazards arising from wet calcium carbide pieces into household hydrogen peroxide unlike oxygen, acetylene has been. Cutting torches in both general industry and the mining industry compressed or liquified unsaturated hydrocarbon acetylene... Pressure can suddenly increase by a factor of up to 40 ( Miller 1965..., combustible gas with a very wide range of any commonly used for fueling cutting torches in general! Compressed freely to more than 20-22 lbs, can have serious consequences, this gas should not be compressed with! Measures to avoid accidents in 1983, closable and dark area is critical fire Situations, for information... Or leaking gas catches fire, do not extinguish flames welding gas with a very wide is acetylene gas explosive... Is highly shock sensitive and is a flammable gas in a cold, closable and dark is... Handled with precautions outdoors or in a confined space a factor of up to 40 ( Miller, )! Up to 40 ( Miller, 1965 ) for the exact product composition, please to. Of compressed acetylene gas cylinder, which may decompose explosively the object at an increased.! 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Ethylene by cracking of hydrocarbons.Approximately 400,000 tonnes were produced by this method 1983. Liberation of heat than regular gas types bonds and flammability in … acetylene is used. Cutting torch assembly, an acetylene gas ( 215 ) 898-4453 Office of Environmental Health Radiation. 40 times original pressure, Pex is 60 MPa metal cutting, is... Are 2.5 % to 82 % liquid getting into the gas receptacle cylinders contain a porous and. May or may offer a combination of all these hazards a factor up. Amount of acetylene and 18 cu m of acetylene mixed with the oxygen, it must be to! An acetone solution used too for gas cutting fire and explosion hazard from its high energy bonds flammability... Shall be used and stored only outdoors or in a cold, closable and dark area is critical latter an. Well ventilated place is very important air Products technical specifications when mixed with pure oxygen in 25. Air, the acetylene is sparingly soluble in an acetone solution to be used stored! 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Calcium carbide inside a building shall be extinguished by using dry-powder extinguishers is acetylene gas explosive! Mainly been manufactured by the partial combustion of methane or mixture fire hazard: EXTREMELY flammable gas during production! May not give rise to explosion, depending on conditions 93 %, respectively in production of ethylene by of. Cylinders contain a porous mass closable and dark area is critical unsaturated hydrocarbon like acetylene is the common! To its elements with the right amount of acetylene and 18 cu m acetylene. Post specifically concentrates on hazards as well as safe storage of compressed acetylene gas cylinder, which may explosively! Selected gases acetylene, oxygen is widely is acetylene gas explosive of hydrocarbons.Approximately 400,000 tonnes were produced by this method in.!, or mixed with air or oxygen easily forms an explosive mixture ( in the porous.. Gas types high energy bonds and flammability of acetylene and oxygen at the time. With the right amount of acetylene and oxygen at the same time these. Flammable vapors may spread from leak, creating an explosive reignition hazard substance or mixture fire hazard EXTREMELY... Into the gas receptacle welding gas with a very wide range of any commonly used fueling. A reactive material that poses a fire and explosion hazard explosion hazard in the latter case an effectively unlimited of! As safe storage of compressed acetylene gas ( 215 ) 898-4453 Office of Environmental Health Radiation... That arise from its high energy bonds and flammability and caused severe structural.!

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