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Transformer Installation and Maintenance
Published in Leonard L. Grigsby, Electric Power Transformer Engineering, 2017
There are four typical materials used for transformer gasket material: Nitrile (Buna-N)—This material has a temperature limit of 100°C. It is recommended that the hardness, as measured by the durometer value, should be 70 or greater.Cork neoprene—This material is commonly used for air joints and temporary shipping covers only. It is the best material for oil sealing when a gasket groove or gasket stop is not present. Recommended compression for this material is 43%.Viton—This material has a temperature limit above 300°C and is often used in high-temperature areas such mounting gaskets for high-current low-voltage bushings and seals within ISO phase bus duct enclosures. Hardness of material as measured by the durometer value should be 70 or greater.Fluor silicone—This material has a temperature limit below 50°C and is often used where very low ambient temperatures are expected. This gasket material should also have durometer value of 70 or greater.
Bearings and Seals
Published in Peter Lynwander, Gear Drive Systems, 2019
For high-speed and high-temperature applications fluoroelastomers are recommended. These materials, sometimes known by the trade name Viton, can be used in a temperature range of −40 to 400°F. They have outstanding resistance to a wide variety of fluids, including synthetic lubricants such as Mil-L-7808 and Mil-L-23699. For critical applications the fluoroelastomers are undoubtedly the best technical choice. The disadvantages of this material are higher cost and limited availability of particular configurations.
Seals and seal systems
Published in Chris Stacey, Practical Pneumatics, 2012
A common proprietary type of fluorine rubber seal material specified for resistance to high temperatures is called ‘Viton’. If found in a charred or sticky condition as a result of very high temperatures, this material is dangerous and should be handled using special procedures as advised by the equipment or seal manufacturer.
A High-Assay Low-Enriched Uranium Fuel Transportation Concept
Published in Nuclear Science and Engineering, 2021
Elmar Eidelpes, Brian M. Hom, Robert A. Hall, Harold E. Adkins, Josh J. Jarrell
The maximum CCV temperature was taken as the maximum permissible service temperature of the elastomeric O-rings of the CCV because they are likely part of the most challenged OPTIMUS-L components in a fire event simulation. This service limit temperature, however, depends on the type of O-ring elastomer (Table XIV). The most heat-resistant rings identified are made of Viton and can withstand temperatures of up to 477 K (399°F). Thus, the maximum CCV temperature is likely limited to 477 K (399°F). This limit does not exceed the maximum continuous-use temperatures of SS304L and 6061-T6 aluminum [700 K and 477 K, or 800°F and 399°F, respectively (see Table XIII)]. The BORTEC flux trap material can withstand temperatures of up to 573 K (572°F).