December 16, 2011

BHS delivers the world's largest rotary pressure filters

One of the world's largest rotary pressure filters, type RPF X 20. Members of the crew for final assembly of filters are proud of their many months of work.

One of the world's largest rotary pressure filters, type RPF X 20, featuring a filter area of 9.0 m². Proud of their many months of work: Xaver Götzfried (left) and Dominik Lipp representing the crew for final assembly of filters

BHS recently set up a new record: with the addition of the new X 20 filter to the range of rotary pressure filters, a filter area of 9 m² is now available for each machine. At the end of November 2011, BHS-Sonthofen delivered five RPF X 20 rotary pressure filters to a customer in China. In the manufacture of intermediate plastic products at the Chinese customer's facility, a suspension volume of up to 225 m³ is filtered per filter and hour. This is equivalent to roughly 100 t of solids per filter and hour. BHS is the world's only manufacturer of rotary pressure filters with an atmospheric output of this magnitude.

Previously, the type C 16 filter, featuring a filter area of 7.7 m², was the largest system in the RPF range. With the new type X 20, BHS has increased the filter area by nearly 20 percent. At the same time, the new type has a smaller drum diameter than the C 16 filter, allowing increased operating pressures and reduced maintenance costs.

The rotary pressure filters operate at a temperature of 160 °C and a pressure of 7 bar (g). With a drum diameter of 1.8 m and an active length of 2 m, the system must withstand high loads and is therefore mechanically engineered for demanding applications. BHS uses state-of-the-art calculation and production methods. The result is high-tech mechanical engineering: each of the 35 t filter systems incorporates approximately 20 t of stainless steel.

Rotary pressure filters can be used for nearly all filterable suspensions. As high-performance filters, they are excellent for the precise separation of products that are difficult to filter. They also represent well-proven solutions in complex production processes for which other filter methods are not suitable.

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