In 1516 when the German purity law was formulated, it was already known that to brew a good beer you only require hop, barley malt, yeast and water. The ingredients as well as the processes must be so pure that no bacteria that could influence the fermentation process. For such particularly critical application areas, Donaldson has developed a new range of filter housings for filtrating fluids.
The housings for the Donaldson Ultrafilter PF-EG models are manufactured from a stainless steel (1.4404), which is low in carbon. As a standard, the sealing material EPD conforms to the FDA-directive (177.2600) for being equitable to foodstuffs. All parts, which come into contact with the product, are electro-polished and have a surface finish of under 0,8 (Ra). This ensures that not even the smallest particles are able to cling to the inside of the housing. Housings in the quality Ra< 0,5 (with certificate) are available for pharmaceutical applications.
The fluidic optimized filter housings do not have any clearance volumes – this is a very important requirement for hygienically relevant applications and for a low differential pressure. In the vicinity of the inlets and outlets the PF-EG housings for beverage applications have a pharma-valve, which is designed for condensate discharge. The housings for pharmaceutical applications have the condensate discharge above the pharma-valve and only on the inlet side; a clamp connection is mounted on the top of the housing.
As a standard the new model range comprises of seven different sizes for volume flows of 30 to 600 l/min. For larger volume flows housings can be manufactured according to the requirements of the customer. The housings are designed for a pressure of 10 bar (at 20°C) respectively 3,7 bar at 149°C. The filter element can be exchanged without large time effort: a tri-clamp connection with a massive clamp, or for larger housings with screws, enables a secure connection and a swift disconnection of the bottom and the upper part of the filter housing. A bayonet connection, as well as fixture in the upper part of the housing, provides a secure fit of the element even if sudden pressure changes should occur.
As a component of the Donaldson Ultrafilter modular construction system, the new PF-EG stainless steel housings, which meet all the requirement of process filtration, can be fitted with a variety of filter elements. The selection includes amongst others pre-filters, liquid depth filers and liquid membrane filters with different pore sizes.
Donaldson Ultrafilter not only offers technical and convincing efficient solutions for liquid filtration in brewing processes. In many fermentation tanks all over the world, Donaldson Ultrafilter de-airing and vent filters contribute to the controlled fermentation process and ensure, that only sterile air reaches the tanks. This prevents unwanted “wild” yeasts entering the process.
Donaldson Filtration Asia Pacific is headquartered in Singapore. Donaldson Company, Inc., headquartered in Minneapolis, Minn., is a leading worldwide provider of filtration systems and replacement parts. Founded in 1915, Donaldson is a technology-driven company committed to satisfying customer needs for filtration solutions through innovative research and development. Donaldson serves customers in the industrial and engine markets including in-plant air cleaning, compressed air and gas purification, power generation, specialty filtration, off-road equipment and trucks. Our 10,000 employees contribute to the company’s success at over 30 manufacturing locations around the world. In fiscal year 2004, Donaldson reported sales of more than $1.4 billion and grew earnings for the 15th consecutive year. Donaldson is a member of the S&P MidCap 400 Index and Donaldson shares are traded on the New York Stock Exchange under the symbol DCI. Additional company information is available at www.donaldson.com.
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