Flammable mixture. Mixtures of fuel gases and air or oxygen may be explosive and shall be guarded against. No device or attachment facilitating or permitting mixtures of air or oxygen with flammable gases prior to consumption, except at the burner or in a standard torch, shall be allowed unless approved for the purpose.
Maximum pressure. Under no condition shall acetylene be generated, piped except in approved cylinder manifolds or utilized at a pressure in excess of 15 psig kPa gauge pressure or 30 psia kPa absolute. The 30 psia kPa absolute limit is intended to prevent unsafe use of acetylene in pressurized chambers such as caissons, underground excavations or tunnel construction.
This requirement is not intended to apply to storage of acetylene dissolved in a suitable solvent in cylinders manufactured and maintained according to U. Department of Transportation requirements, or to acetylene for chemical use. The use of liquid acetylene shall be prohibited. Only approved apparatus such as torches, regulators or pressure-reducing valves, acetylene generators, and manifolds shall be used. Workmen in charge of the oxygen or fuel-gas supply equipment, including generators, and oxygen or fuel-gas distribution piping systems shall be instructed and judged competent by their employers for this important work before being left in charge.
Rules and instructions covering the operation and maintenance of oxygen or fuel-gas supply equipment including generators, and oxygen or fuel-gas distribution piping systems shall be readily available. All portable cylinders used for the storage and shipment of compressed gases shall be constructed and maintained in accordance with the regulations of the U. Department of Transportation, 49 CFR parts Compressed gas cylinders shall be legibly marked, for the purpose of identifying the gas content, with either the chemical or the trade name of the gas.
Such marking shall be by means of stenciling, stamping, or labeling, and shall not be readily removable. Whenever practical, the marking shall be located on the shoulder of the cylinder. All cylinders with a water weight capacity of over 30 pounds Inside of buildings, cylinders shall be stored in a well-protected, well-ventilated, dry location, at least 20 feet 6. Cylinders should be stored in definitely assigned places away from elevators, stairs, or gangways.
Assigned storage spaces shall be located where cylinders will not be knocked over or damaged by passing or falling objects, or subject to tampering by unauthorized persons. Cylinders shall not be kept in unventilated enclosures such as lockers and cupboards. Valve protection caps, where cylinder is designed to accept a cap, shall always be in place, hand-tight, except when cylinders are in use or connected for use. Fuel-gas cylinder storage.
Inside a building, cylinders, except those in actual use or attached ready for use, shall be limited to a total gas capacity of 2, cubic feet 56 m 3 or pounds For storage in excess of 2, cubic feet 56 m 3 total gas capacity of cylinders or The hottest and most efficient of all fuel gases, acetylene C 2 H 2 provides high levels of productivity thanks to good localised heating with a minimum of thermal waste.
It also requires the least amount of oxygen to ensure complete combustion. This flammable, colourless gas is lighter than air so does not accumulate at low levels, where it could cause a potential hazard. It is generally supplied dissolved in acetone or DMF dimethylformamide in specially designed cylinders to prevent decomposition. A low flame moisture content makes this fuel gas a good choice for many critical heating processes.
Typical applications include flame heating, flame gouging, welding, flame hardening, flame cleaning, flame straightening, thermal spraying, spot-heating, brazing, texturing, profile-cutting, branding wooden pallets, wood-ageing and carbon coating. It is also the only fuel gas, for instance, which can be used to weld steel.
In cutting, oxy-acetylene gives the fastest preheating and piercing times of any fuel gas combination. In atomic absorption flame spectroscopy, acetylene is combined with high-purity synthetic air or nitrous oxide as a fuel for the flame. Beyond its obvious value as a fuel gas, acetylene has many other less-well-known applications.
It is used to produce certain plastics and chemicals for instance. It also plays a role in organic synthesis laboratory work and chemical synthesis. In plant cultivation, it improves the forming of new flowers. It is also used as a carbon source in molecular manufacturing, in calibration gases for the gas, oil and chemical industries and in lung testing gases.
Acetylene is manufactured commercially by reacting calcium carbide and water. It is also a by-product of ethylene production.There are two basic types of compressed gas cylinders.
Non-refillable cylinders are designed for one-time use and should never be refilled or reused.
Refillable cylinders are made of steel or aluminum, and are designed for refilling and repeated use. Some cylinders have been in service for over 40 years! Because commonly used gases are highly pressurized between 1, psig and 2, psigcylinders must be maintained in good condition and protected from accidental damage at all times.
A compressed gas cylinder that has been accidentally knocked over and damaged at the valve can result in extensive property damage and personal injury. Never attempt to stop a damaged cylinder that is spinning in place due to rapid release of pressurized contents! Leave the area until the contents are dispelled and the cylinder has stopped. Effects of heat can cause the cylinder to expand and contract with pressure changes. Cylinders are designed, to some degree, to handle such pressure changes, however, cylinders made of aluminum are affected by heat more than cylinders made of steel and can rupture.
Some suppliers use invisible heat strips on the cylinders to identify damage from heat. Strips are invisible under normal temperatures, but will turn orange or brown if exposed to more than degrees F.
Arcing damage from welding operations can result in a heat rise sufficient enough to cause a pressure explosion or the pressure relief device to activate. This occurs most frequently on argon, carbon dioxide, helium, and inert mixture cylinders used in heliarc welding when the torch is left dangling on top of the cylinder. For this to happen, the cylinder must be part of the electrical circuit connecting the work to the welding machine.
This is highly dangerous even without the arc burn and must not be permitted. Arc burns are easily recognized by a spot, or series of spots, of freshly burned paint, exposing bare metal. When caused by a stick electrode, there can be a deposit of filler metal on the cylinder where the electrode dragged.
Dents can occur from impact or mishandling, which can weaken the walls of the cylinder making it more susceptible to rupture. Corrosion from moisture, salt, corrosives, and other materials can corrode cylinders, especially the bottom of the cylinder where stored on the ground.
Always store cylinders in a dry location, preferably on a concrete surface. For other situations, consider the following:. Return to Skip Menu Search. Return to Skip Menu Main Navigation.
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Compressed Gas Cylinders: Cylinders.We offer acetylene gas C 2 H 2 in a variety of purities and packages. See the chart below and download the spec sheets and safety data sheets for more information on buying acetylene gas from Praxair. At Praxair, we develop the right grades for the right applications. Give us a call and we'll help you determine the best supply option for your operations. Acetylene is used as a key component in low pressure carburizing.
It provides the precise carbon source automotive manufacturers need to create a strong, wear-resistance surface layer on steel parts. Heat Treating.
Acetylene offers the hottest flame temperature of all commercially available fuel gases, making it an ideal atmosphere for oxy-fuel welding and cutting, as well as brazing applications. For smaller specialized applications, we offer acetylene gas C 2 H 2 in cylinders that range from 10 to cubic feet. We also offer acetylene gas in clusters consisting of nine large cylinders manifolded together to contain 4, cubic feet.
We deliver acetylene in bulk trailers that range from 78, to 90, cubic feet. At Praxair, our scale and reach lets us supply any gas, for any application, almost anywhere in the world — safely, reliably and cost-effectively. Send a question or comment. Shop PraxairDirect.
Acetylene C 2 H 2. Explore other industries that use acetylene. Supply Options. Buy Online Find the right welding and specialty gas equipment, supplies and information.Acetylene systematic name : ethyne is the chemical compound with the formula C 2 H 2.
It is a hydrocarbon and the simplest alkyne. It is unstable in its pure form and thus is usually handled as a solution.
Uses & Applications of Acetylene Gas by Industry
As an alkyne, acetylene is unsaturated because its two carbon atoms are bonded together in a triple bond. Acetylene was discovered in by Edmund Davywho identified it as a "new carburet of hydrogen".
By heating potassium carbonate with carbon at very high temperatures, he produced a residue of what is now known as potassium carbide, K 2 C 2which reacted with water to release the new gas.
He also found that acetylene was formed by sparking electricity through mixed cyanogen and hydrogen gases. Berthelot later obtained acetylene directly by passing hydrogen between the poles of a carbon arc. Since the s, acetylene has mainly been manufactured by the partial combustion of methane.
Approximatelytonnes were produced by this method in It is selectively hydrogenated into ethyleneusually using Pd—Ag catalysts. Until the s, when oil supplanted coal as the chief source of reduced carbon, acetylene and the aromatic fraction from coal tar was the main source of organic chemicals in the chemical industry.
In the US, this process was an important part of the lateth century revolution in chemistry enabled by the massive hydroelectric power project at Niagara Falls. In terms of valence bond theoryin each carbon atom the 2s orbital hybridizes with one 2p orbital thus forming an sp hybrid.
The other two 2p orbitals remain unhybridized. At atmospheric pressure, acetylene cannot exist as a liquid and does not have a melting point. At temperatures below the triple point, solid acetylene can change directly to the vapour gas by sublimation. At room temperature, the solubility of acetylene in acetone is For the same amount of dimethylformamide DMFthe solubility is 51 g. At These solvents are used in pressurized gas cylinders.
Oxyacetylene is the hottest burning common fuel gas.Cory March 4, Acetylene and oxygen gases are used to weld and cut metal. They are often combined to create a very intense flame at a very high temperature. Oxygen is used in welding, cutting, soldering, and brazing. Acetylene is an extremely volatile gas that is used in welding, brazing, wood aging, carbon coating, thermal spraying, and texturing.
Acetylene is stored and transported in cylinders. The cylinders contain a mixture of gas dissolved in a solvent, usually acetone, and a porous mass for acetylene stability.
The cylinders are designed to slow down decomposition, which, when left to itself, can create an extremely hazardous and volatile atmosphere. Portable gas detection monitors alert workers if oxygen is present at an elevated level. When that happens, any fire will receive an instant boost that can lead to an explosion or uncontrolled fire. The cylinders coming into contact with incompatible substances like oil, grease, some plastics, and metals, which can lead to ignition or combustion.
Acetylene is so volatile it has to be dissolved in a solvent and stored with a porous mass to keep it stable. This combination thwarts decomposition, which generates heat and can lead to ignition and explosion. Decomposition is caused by:. For safety purposes, oxygen and acetylene cylinders have to be stored a minimum of 10 feet from each other. That means they must be returned to storage at the end of a workday, even if they will be used together the next day.Acetylene Cylinder Safety: 3 Key Rules to Remember
In the storage facility, both types of cylinders must be kept separate. A fixed or portable gas detector also is recommended. If space is an issue, employees should adhere to state and local laws for how to store them using screen walls.
Sales: 0 Items Shop Now. The Basics Oxygen is used in welding, cutting, soldering, and brazing. Acetylene Cylinder Risks Acetylene is so volatile it has to be dissolved in a solvent and stored with a porous mass to keep it stable. Decomposition is caused by: Exposure to intense heat Reaction to incompatible substances such as copper or brass Separation of the gas from the acetone and the porous mass in the cylinders Exposure to sparks Rapid release of the gas and the failure to detect this breach by a portable gas leak detector Storage For safety purposes, oxygen and acetylene cylinders have to be stored a minimum of 10 feet from each other.Coronavirus: USA Safety is open and accepting new orders.
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Read on to learn more about these guidelines. Cylinders should be stored in definitely assigned places away from elevators, stairs, or gangways. Assigned storage spaces shall be located where cylinders will not be knocked over or damaged by passing or falling objects or subject to tampering by unauthorized persons.
Cylinders shall not be kept in unventilated enclosures such as lockers and cupboards. They shall not be hoisted or transported by means of magnets or choker slings. They shall not be intentionally dropped, struck, or permitted to strike each other violently. Bars shall not be used under valves or valve protection caps to pry cylinders loose when frozen. Warm, not boiling, water shall be used to thaw cylinders loose. Assigned storage places shall be located where cylinders will not be knocked over or damaged by passing or falling objects, or subject to tampering by unauthorized persons.
When this is impractical, fire resistant shields shall be provided. Electrodes shall not be struck against a cylinder to strike an arc. They shall not be placed in a location where they would be subject to open flame, hot metal, or other sources of artificial heat.
No one except the owner of the cylinder or person authorized by him, shall refill a cylinder. No one shall use a cylinder's contents for purposes other than those intended by the supplier.
When a special wrench is required, it shall be left in position on the stem of the valve while the cylinder is in use so that the fuel gas flow can be shut off quickly in case of an emergency.
In the case of manifolded or coupled cylinders, at least one such wrench shall always be available for immediate use.
Nothing shall be placed on top of a fuel gas cylinder, when in use, which may damage the safety device or interfere with the quick closing of the valve. Defective hose, or hose in doubtful condition, shall not be used.