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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.

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.

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.

These pressure vessels are filled with activated carbon and are used to clean pollutants in sewage. Activated carbon is particularly suitable for absorbing organic substances. As an alternative, the vessels are also suitable for the treatment of turbidity filtration during beverage processing. The vessels are construed designed for a maximum operating pressure of 5 bar.

International projects are often bid for using materials produced according to the ASME-code. These generally conform to European standards and can be given both American and European stamps of approval. Both standards are verified in the material certificate and the material is also stamped with both labels at the factory. Typical ASME-stainless steel materials are 304L, 316L and 321 – LBF is experienced and has the proper credentials in matters of purchasing, documenting, and processing.

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