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A material not only needs to function well, sometimes aesthetic reasons can also be decisive for using certain materials. Pre-ground stainless steel sheet material can be used. The pre-processed surface area is protected by a factory-applied foil suitable for lasers.  In this project for exhaust air towers, the ground sheet metal is rounded and bolted together from the inside; welds are found only on the base plate and the tower head.

Aluminium, being a light material (three times lighter than steel), is ideal for specific applications. In paper technologies, large amounts of extremely moist, steam-filled exhaust air is extracted through tightly welded, low-pressure duct systems. With regard to corrosion, AlMg3 is comparable to stainless steel for this type of application. However, being lighter it is less expensive and is a great advantage in respect to the supports and loads that the structure must already bear.

DUCoaT – pipes and ducts with Halar-interior-coating are used in exhaust air facilities where highly aggressive exhaust process air from the machines is released into the atmosphere through the scrubber system. Available standards for pipes, fittings, connecting systems and special components, such as multi-leaf dampers and silencers, are compiled in our planning folder. Upon request we are happy to inspect rectangular systems and special parts, such as scrubbers, tanks and customer drawings to verify that they conform to FM regulations and stability.

In the electroplating technology, parts are dipped in baths for a corrosion-resistant coating, e.g. chrome or gold plated. Aggressive gases and liquids with acidic or alkaline components are used in these electrochemical processes. Conventional exhaust air systems with PPS plastic are replaced with state-of-the-art Halar coated pipe lines. An important advantage is “fire prevention” since our DUCoaT-System boasts a much lower fire load compared to PPS.

Extraction systems for dust-laden filter systems are not only composed of fans, silencers, filter systems and cyclones, but also pipe lines (usually operating under low-pressure). This low-pressure has an advantage with regard to tightness; however, it also leads to higher demands on stability. Therefore, pressure, temperature and external loads (such as wind forces and bearing forces) are taken into consideration when designing the pipe – the thickness of the sheet metal, the flanges, as well as stiffening rings and inner reinforcements, are all specified in the design.

Grains are pre-cleaned in the ducts – “the chaff is sifted from the wheat”. Typical duct cross-sections have edge lengths of 600 - 1200mm. On site several of these curved and welded duct assemblies are screwed together with other components to form a grain processing plant.