Engineer's Guide to Effective Heat Processing
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table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:46.00pt "Impact", sans-serif; } .font1 { font:11.00pt "Tahoma", sans-serif; } IUSTRIES ENGINEER'S GUIDE TO EFFECTIVE HEAT PROCESSING

table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:31.00pt "Arial", sans-serif; } .font1 { font:11.00pt "Impact", sans-serif; } .font2 { font:9.00pt "Lucida Sans Unicode", sans-serif; } .font3 { font:8.00pt "Tahoma", sans-serif; } About This guide discusses gnral issues related to the s驩lection of industrial equipment for heat processing. Since nearly all products manufactured today require heat application at some point in the process, this guide was created to provide a base knowledge of the complexity of issues related to selection of optimum equipment for any...

table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:6.00pt "Impact", sans-serif; } .font1 { font:11.00pt "Impact", sans-serif; } .font2 { font:9.00pt "Lucida Sans Unicode", sans-serif; } .font3 { font:8.00pt "Tahoma", sans-serif; } Batch-Type Ovens These ovens represent the largest category of ovens used to manufacture products Batch-type ovens can be classified as cabinet-style or truck-loaded type. The size can range from small bench top units to large industrial installations with thousands of cubic feet. Heat-Up/Soak/Cool-Down Times Heat-up, soak, and...

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table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:11.00pt "Impact", sans-serif; } .font1 { font:9.00pt "Lucida Sans Unicode", sans-serif; } .font2 { font:8.00pt "Tahoma", sans-serif; } With an inert atmosphre oven, however, cooling by means of exhausting oven air is not usually a viable method, as oxygen is introduced into the oven. Air-to-air or air-to-water heat exchangers are effective in removing heat from the oven in these applications. Air-To-Air Heat Exchangers These use a finned plate positioned between the oven air and a duct through which ambient air...

table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:6.00pt "Impact", sans-serif; } .font1 { font:11.00pt "Impact", sans-serif; } .font2 { font:8.00pt "Tahoma", sans-serif; } .font3 { font:25.00pt "Tahoma", sans-serif; } Processes Involving Flammable Solvents Material Handling When the material to be processed in an oven is combustible or contains flammable solvents, a special oven defined as "Class A" by the National Fire Protection Association (NFPA), Bulletin 86, is required. NFPA standards are used by OSHA and insurance underwriters to meet their requirements,...

table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:5.00pt "Impact", sans-serif; } .font1 { font:11.00pt "Impact", sans-serif; } .font2 { font:9.00pt "Lucida Sans Unicode", sans-serif; } .font3 { font:8.00pt "Tahoma", sans-serif; } .font4 { font:6.00pt "Verdana", sans-serif; } Types of Airflow When selecting an airflow pattern, the most important considration is the load configuration. The main goal is to minimize obstructions to the airflow for more uniform heat distribution and to maximize the product surface area with which airflow will come into contact....

table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:11.00pt "Impact", sans-serif; } .font1 { font:8.00pt "Tahoma", sans-serif; } .font2 { font:25.00pt "Tahoma", sans-serif; } ren Loading Openings Heating/Cooling The type of oven loading opening is quite important in order to get the right equipment to do the job. For example, standard reach-in front load models are well suited for products which can be loaded onto a shelf. These generally accommodate light weight or easy-to-handle parts. Walk-in front load units are used in truck load type applications or for...

table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:7.00pt "Impact", sans-serif; } .font1 { font:11.00pt "Impact", sans-serif; } .font2 { font:8.00pt "Tahoma", sans-serif; } Atmosphre Type Thermal process ovens utilize diffrent atmosph詨res in order to satisfy certain processing criteria. For example, inert atmosphere ovens are generally utilized when a process requires a low oxygen concentration in the oven due to oxidation of the test parts at elevated temperatures. The inert gas is injected into a sealed chamber, pressurizing the oven and replacing the oxygen....

table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:6.00pt "Impact", sans-serif; } .font1 { font:7.00pt "Impact", sans-serif; } .font2 { font:11.00pt "Impact", sans-serif; } .font3 { font:9.00pt "Lucida Sans Unicode", sans-serif; } .font4 { font:8.00pt "Tahoma", sans-serif; } Electrical Requirements When specifying an industrial oven, it is essential to know what electrical power is available at the installation site. Electrical utilities vary widely throughout the U.S. and the world. You will need to know the voltage, phasing and the frequency, e.g., 480 volt, 3...