When transporting, make sure the cylinder is settled upright to avoid any hazards. After the gases settle within the cylinder and are ready to release, make sure you dispense the gas slowly to avoid any combustion or malfunctions that could occur.
As always, please make sure you are knowledgeable on the safety regulations or have a professional technician from Air Source Industries deliver the cylinder for you. If you have a business or project that requires the use of acetylene gas, we carry it in commercial and atomic absorption AA grades. For assistance with gas specifications, please call us directly at or get a quote online if you already know what you need.
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Military Release Date Required. Get Info Get Info. Previous Step. Table of Contents. Oxy-fuel welding basic equipment includes the following: Cylinders: Steel pressurized cylinders contain oxygen and the fuel gas. Regulators: The flow of gas needs to be controlled. Regulators take high pressure and reduce it to a lower working pressure. Hoses: A nonporous hose is used to move the oxygen and fuel gas to the torch.
To prevent the wrong hose from being installed or set up incorrectly, the oxygen hose is usually green and the fuel gas hose is usually red. Hose fittings: Siamese hoses are one piece with hoses that have been molded together. Hoses can also be taped together. Oxygen hoses have right-hand threaded fittings. Fuel-gas hoses have left-hand threaded fittings.
Regulator-mounted and torch-mounted flash arrestors should be used on oxygen hoses and fuel hoses. Regulator-mounted flash arrestors stop flashbacks and backfires from entering the hoses and, potentially, the cylinders.
Safety valves: Safety valves keep the flow of gas going in one direction, preventing gas from flowing back into the wrong line or cylinder.
They also reduce the possibility of a flashback. Although very little UV is emitted, the welder must wear tinted goggles. The grade of filter is determined by the intensity of the flame which depends on the thickness of metal being welded; recommendations for filters according to the acetylene flow rate are given in the table BSEN Joints and hoses should be checked for leaks before any welding is attempted. Leak detection is best carried out applying a weak typically 0. It is applied to the joints using a brush and the escaping gas will form bubbles.
On curing the leak, the area should be cleaned to remove the residue from the leak detecting solution. A backfire a single cracking or 'popping' sound is when the flame has ignited the gases inside the nozzle and extinguished itself. This may happen when the torch is held too near the workpiece. A flashback a shrill hissing sound when the flame is burning inside the torch, is more severe. The flame may pass back through the torch mixing chamber to the hose. The most likely cause is incorrect gas pressures giving too low a gas velocity.
Alternatively, a situation may be created by a higher pressure gas acetylene feeding up a lower pressure gas oxygen stream. This could occur if the oxygen cylinder is almost empty but other potential causes would be hose leaks, loose connections, or failure to adequately purge the hoses.
Non-return valves fitted to the hoses will detect and stop reverse gas flow preventing an inflammable oxygen and acetylene mixture from forming in the hose. The flashback arrestor is an automatic flame trap device designed not only to quench the flame but also to prevent the flame from reaching the regulator.
My question is that why is ethene not used? What properties of ethyne make it suitable for welding? An acetylene molecule is composed of two carbon atoms and two hydrogen atoms. The two carbon atoms are held together by what is known as a triple carbon bond. This bond is useful in that it stores substantial energy that can be released as heat during combustion. The triple bond which makes the oxy-acetylene flame the hottest of all gas flames is also responsible for two rather exceptional properties of acetylene gas.
The first is: If free gaseous acetylene is subjected to severe shock, or a source of ignition, some of the triple bonds may break, releasing enough energy to cause all the other molecules in the enclosed volume to decompose into carbon and hydrogen with explosive force. The force of such an explosion is not so great as that released by the explosion of most mixtures of acetylene and oxygen, or acetylene and air, but it is substantial, and can be withstood only by extra-heavy-wall steel tubing.
Mixtures of methane the principal component of natural gas and air are flammable when they contain as little as 5 percent methane and not more than 15 percent methane. To be suitable for welding operations, a fuel gas, when burned with oxygen, must have the following:. Among the commercially available Oxy Fuel welding fuel gases, acetylene combination of hydrogen and carbon most closely meets all these requirements.
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