In any location where there is sufficient potential for an explosion or fire to occur as a result of the presence of combustible gases, vapors, or finely pulverized dust in the air, a spark resistant explosion proof ventilator may be needed to be installed. It may also be necessary in situations when flyings or fibers that are quickly combustible are present. The following information is a typical list of the sorts of sites and activities that need hazardous location air exhaust / ventilation systems in at least some regions; however, it is not an all-inclusive list of those types of locations and operations. For information that is both comprehensive and up-to-date, the National Electric Code should be consulted. Canada Fan manufactures fans and blowers designed specifically for use in demanding environments. Fan and blower components, such as high pressure blowers, high temperature fans, spark resistant and explosion proof ventilators, tubeaxial and vaneaxial high pressure ventilators, and explosion proof ventilators are just some of the products that Canada Fan Co. distributes all over the world for industrial process and OEM applications. Repairs, rebuilds, and dynamic wheel balancing are some of the additional services that Canada Blower offers for pre-existing fans and blowers. The following are examples of typical Class I Locations:? Facilities for the refining of petroleum? tanks for dipping that hold chemicals that are flammable or combustible? Plants used for dry cleaning? Establishments that manufacture organic coatings? booths for spraying paint? Spray regions that need finishing (residue must be taken into consideration)? locations where petroleum is dispensed? Plants for the extraction of solvents? Are there any plants that produce or use pyroxylin? Types of (nitro-cellulose) and other plastics? (Class II, in addition)? Places where inhalational anesthetics are administered to patients? liquefied petroleum and natural gas, as well as natural gas utility plants and activities requiring storage and processing of these materials? Hangars for planes and fueling and maintenance areas Grain elevators and other facilities that handle bulk materials are examples of typical Class II locations. facilities for the synthesis of magnesium and aluminum powder and their storage? Facilities for the manufacturing of starch and its storage? Facilities for the manufacturing and storage of fireworks? Mills for both flour and animal feed? Where are the spaces designated for the packing and processing of the pulverized sugar and cocoa? Installations for the processing and storage of coal? Plants for crushing various spices? factories that manufacture candies and sweets Locations that are Typical of Class III Include the following:? Plants that work with wood? Mills that make textiles? Gins for cotton and mills that process cotton seeds? Plants that are productive of flax It’s possible that certain compounds have properties that need additional safety precautions on top of those that are necessary for any of the authorized atmospheric groups. One example of this kind of chemical is carbon disulfide, which has a low temperature at which it may ignite and only requires a minimal joint clearance in order to prevent the spread of its flame. Some metal dust may have properties that need additional safety precautions in comparison to those that are necessary for environments that include dust consisting of aluminum, magnesium, and their commercial alloys. Zirconium, thorium, and uranium dust are three examples of materials that have minimum ignition energy and temperatures that are far lower than those of any substance that is classed as belonging to any of the Class I or Class II categories. At order to reduce the likelihood of a random spark serving as the ignition source of an explosion in a hazardous area, the design of the Hazardous Location fans incorporates spark resistant construction. All of the essential components, such as the explosion-proof motors and aluminum propellers and blades, are made from materials that, when subjected to a direct impact strike, will not cause a spark to be generated in the material. Consider, for the sake of illustration, the possible repercussions that may arise in the event that a tool were to fall and hit the blade or the propeller of an operating exhaust or ventilation fan. The potential for an explosion is much reduced when it takes place in an environment where there is no danger. On the other hand, the outcomes may be quite different if the same tool is used to hit the exposed steel surfaces of a fan that is working in a potentially dangerous environment that contains gasoline fumes. The strike delivered by the instrument has the potential to cause an errant spark. In the case of gasoline vapors, the addition of the correct amount of air to a combination of gasoline vapors and gasoline vapors has the potential to cause an explosion. Using tools and other equipment that are spark proof in potentially dangerous environments is crucial for a number of reasons, one of which is to reduce the likelihood of an ignition caused by a spark. The likelihood of a spark-ignited explosion being triggered by a direct strike is significantly reduced when the fundamental spark resistant blade / motor structure is included into the design. It is not enough for a fan to just have an explosion-resistant motor or metal blades and propellers in order for the fan to be considered “explosion proof.” At the same time, there is no such thing as an air ventilation or exhaust fan that is completely explosion resistant. In a potentially hazardous environment, the possibility of an explosion may only be reduced to a tolerable level by a product that adheres to all relevant design and certification criteria. Please visit http://www.cincinnatifan.net for any other information that you may want. Oleg Tchetchel is the Ventilation Equipment Engineer at Canada Fan Company. You may contact him at nis@primus.ca. http://www.cincinnatifan.net/canadianblowertubeaxial.html http://www.cincinnatifan.net/biblower.html
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