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Sustainability in Joining
Published in R. Ganesh Narayanan, Jay S. Gunasekera, Sustainable Material Forming and Joining, 2019
In gas welding (or flame welding), various fuels are combined with oxygen to generate heat required for welding. The fuels used are acetylene, methylacetylene-propadiene, hydrogen, propylene, and propane. If acetylene is used, which is predominantly the case; it is called oxyacetylene gas welding. Filler rod is not mandatory, but if used, it is coated with flux responsible for protecting weld pool from atmosphere. In oxyacetylene gas welding, combustion occurs in two stages. In the first stage, the products are CO and H2, which further undergoes reaction in the second stage, resulting in CO2 and heat generation. The combined heat generated is about 50 × 106 J/m3 of acetylene. In gas welding, the important sustainability and green contribution to the process comes in the form of fuel (e.g., acetylene or propane) and the type of flame (e.g., neutral or reducing or oxidizing) used for combustion. Methods of storing acetylene and materials for hoses are also crucial. The combination of acetylene and oxygen is highly flammable, and hence oxyacetylene welding is not eco-friendly and unsafe for workers.
Annotated Dictionary of Construction Safety and Health
Published in Charles D. Reese, James V. Edison, Annotated Dictionary of Construction Safety and Health, 2018
Charles D. Reese, James V. Edison
Fire prevention and protection requirements, applicable to underground construction operations, are to be followed. Open flames and fires are to be prohibited in all underground construction operations, except as permitted for welding, cutting, and other hot work operations. Smoking may be allowed only in areas free of fire and explosion hazards. Readily visible signs prohibiting smoking and open flames are to be posted in areas having fire explosion hazards. The employer is not permitted to store underground more than a 24-hour supply of diesel fuel for the underground equipment used at the worksite. The piping of diesel fuel, from the surface to an underground location, is permitted only if the diesel fuel is contained at the surface. This fuel must be in a tank which has a maximum capacity of no more than the amount of fuel required to supply, for a 24-hour period, the equipment serviced by the underground fueling station. The surface tank is to be connected to the underground fueling station by an acceptable pipe or hose system, and this system is to be controlled at the surface by a valve, and at the shaft bottom by a hose nozzle. The pipe is to be empty at all times, except when transferring diesel fuel from the surface tank to a piece of equipment in use underground. In the shaft, hoisting operations are to be suspended during refueling operations, if the supply piping, in the shaft, is not protected from damage. Gasoline is not to be carried, stored, or used underground. Acetylene, liquefied petroleum gas, and methylacetylene propadiene stabilized gas may be used underground only for welding, cutting, and other hot work.
Fire Hazards of Materials and Their Control
Published in Peter M. Bochnak, Fire Loss Control, 2020
Gases can also be classified by physical properties. Compressed gases exist in a gaseous state under pressure at normal temperatures in a container. The pressures can range from 25 to 3000 psig. Examples of compressed gases are oxygen, ethylene, hydrogen, and acetylene. Liquefied gases exist in a partly gaseous and partly liquid state under pressure at normal temperatures in a container. Normally, a liquefied gas is much more concentrated than is a compressed gas, usually at orders of magnitude more volume when released to the atmosphere. Examples are liquefied petroleum gas (LPG) and methylacetylene-propadiene, stabilized (MPS).
Performance, combustion and emission analysis of internal combustion engines fuelled with acetylene – a review
Published in International Journal of Ambient Energy, 2022
Sumit Sharma, Dilip Sharma, Shyam Lal Soni, Digambar Singh, Amit Jhalani
There are many alternative fuels are available and is being used regularly, and many of research has been done on alternative fuels but due to increasing energy demand day by day, engine efficiency and environmental concern some of the further research should be necessary for alternative fuels. Among the commercially available gaseous fuel such as natural gas, liquefied petroleum gas (LPG), hydrogen and MAPP (Methylacetylene Propadiene Propane) gas, ‘Acetylene’ most closely meets all the above requirements. The properties of acetylene, conventional fuels and other gaseous fuels shown in Table 1.