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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.

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 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.

Silencers also fall within the scope of the Pressure Equipment Directive (PED) when the operating pressure is greater than 0,5 bar. Discharge silencers are designed in round form, typically 3 – 10 mm thick and ideally with dished ends. An air pressure test is recommended on account of the interior fittings. The acoustic interior fittings can be produced as a circumferential baffle with an absorptive core. Both pressure and temperature have to be taken into consideration when designing the silencer.

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.

Silencers are used in oxygen stations containing rotary blowers. Because of the alternating pressure loads, especially high demands are placed on the vessel and their noise protection devices. The vessels are ideally of round design; the interior fittings are a combination of absorbent filling with a special cover plate for the protection of the mineral wool. To reduce the low frequencies, the absorbers are combined with panel resonators.

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