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There is a wide variety of vessels in the environmental technologies that are used as collecting tanks, filter tanks, separators, cyclones and much more. In this particular project there are multiple processing cycles running parallel to each other that alternately operate and regenerate. The goal of the filter tank is to filter organic components out of the exhaust air. The tanks are operated unpressurised, that is under an operating pressure of 0,5 bar. Therefore, the tanks are not subject to the Pressure Equipment Directive (PED).

The filter vessel is considered a pressure vessel due to its operating pressure and falls within the scope of the Pressure Equipment Directive (PED) 2014/68/EU. First the design is made in accordance to the AD-Merkblatt, then drafting and a TÜV design review follow. The casing is welded in accordance to the regulations of the AD-Merkblatt. Testing, done in the presence of the TÜV, includes X-ray, pressure tests and final inspections. Complete documentation is provided which includes operating instructions and hazard analysis.

The tank is used as a pulse filter. The upper and lower chambers are separated by a gastight welded shelf. The dust which accumulates when cleaning the pulse filter enters the dust collecting container through a cone. This is conveniently connected to the tank by a clamp. The filter cartridges can be checked and, if needed, exchanged through an inspection opening. Production is based on customer’s drawings.

When designing filter tanks, not only pressure and temperature is considered, but also resistance to corrosion. Different types of stainless steel can be used for this, depending on the medium found in the exhaust air. First, stainless steel tanks are full-surface pickled – exterior and interior – by our experts in our own LBF-pickling facility. Next, passivation then ensures long-lasting corrosion resistance. For aggressive media, additional interior coatings can be applied.

Throttle valves are used for air volume control in order, for example, to regulate various extraction points or to block off individual ducts. Welded throttle valves (shaft, flap, bearing) have to be adjusted to the mechanical requirements of the plant – pressure, speed, temperature, medium.

The chamber for the special machine construction consists of 5-10mm thick walls. The metal profiles and ribbings are circumferentially welded for stabilization against negative pressure. The liquid-tight vacuum chamber is used for automated cleaning operations.

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