EagleBurgmann is proud to report that the first high-pressure paddle dryers went into operation in 2006 at a silica production plant.
The machines were completely redesigned to withstand the high operating pressure (up to 20 bar). The solution, developed by a German manufacturer, was a pioneering achievement. The sophisticated shaft seal was developed in close collaboration with Burgmann Industries.
Mechanical seals are used as shaft seals in pumps, agitators, compressors and other rotary machines handling liquid and gaseous media. The process pressures which have to be contained by the seals range from vacuum to more than 400 bar. In some cases, the chemical and thermal stability required of the mechanical seal is very high. The design of the seal and the choice of material from which it is made play a crucial role in making sure that it operates reliably for a sustained length of time under the conditions for which it was designed and for which the material was chosen.
When media containing solids or media with a tendency towards glueing, sticking or hardening are used in a process, there may be problems for the shaft seals leading to a significant reduction in service life. Even in apparatus with a top drive in which the gas phase is sealed and there is normally no direct contact with the product, deposits in the area of the shaft seal represent a recurring problem, particularly with foaming, polymerizing and crystallizing media because of the high tank fill levels.
It is not always easy to know which sealing system is best for your application. Operating parameters such as pressure, temperature, and speed may not be the only things to think about. Explosion protection (ATEX), environmental protection and operational safety can be equally important.