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Tough demands are placed on the sealing systems in use when industrial plants are to operate without restrictions in a wide range of applications. Espey® carbon floating ring seals by EagleBurgmann Espey offer the optimum solution: from simple, standard fans with straightforward requirements up to special fans for large pressure increases; fans that may also be subject to extremely difficult conditions such as flue gases or potentially explosive environments. All these factors - the robustness, the wide range of operating parameters, and the large number of application-specific optional modifications to the seal - have contributed to decades of successful applications in almost every industrial sector, such as plant construction, chemical and petrochemical engineering, power plant technology, waste disposal, the steel industry and vapour compression.
Issue and challenge:
The manufacture of precision strips with extremely close tolerances from copper and copper alloys requires a continuous kiln with heating and cooling zones for tempering the strip in closed chambers containing an inert gas atmosphere. The tempering process permits recrystallization after previous rolling, in order to achieve the desired mechanical and physical parameters such as expansion, grain size and strength. The strips are transported through the plant without contact on a gas cushion generated by a system of nozzles. The energy required by the flow of gas for this purpose is provided by fans. For reasons of assembly and servicing, the fan motors are mounted outside the chambers. Since very little space is available, the entry of the shafts into the processing area must be implemented with a very short shaft seal. This system protects the copper strips from the oxygen in the atmosphere.
Solution from EagleBurgmann Espey:
To meet the operator's needs, EagleBurgmann Espey selected an Espey® WDKS with barrier gas port, 3 seal rings and a length of no more than 50 mm (1.97 “). Because of its split casing it can easily be fitted without dismantling the motors or other components. The seal is designed for a temperature of 150 °C (302 °F), a pressure of 1.053 bar (15.27 PSI) and a rotation speed of 1500 rpm. Nitrogen is used as the barrier gas, which guarantees that no oxygen gets into the inert gas zones. The seal solution has a long service life, is maintenance-free, and compensates for shaft deflection
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