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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.

Noise protection barriers reduce the radiation of noise from the power units – in the project presented on this page, refrigeration machinery is being enclosed. The air supply for the facility is ensured through the intake openings, where silencers are used to provide noise protection. The noise protection barriers can be produced in the same material and colour to match the facility or the adjacent buildings.

Carbon steel can also be used for high temperatures, for example, S235JR for temperatures of up to 300°C. Heat resistant steels were developed for use in high temperatures, including 16Mo3 which, on account of its chemical composition, can be used for temperatures of up to 450°C. In contrast to stainless steel, it is more susceptible to corrosion; however, the purchase price is considerably lower. In the project pictured here, the section used for lifting the pipe is undergoing a complete dye penetrant inspection.

Exhaust air containing components of solvents may not be emitted into the atmosphere without going through a post treatment system. Two factors play an important role here: the regulatory limits to be complied with and the prevention of unpleasant odours. The piping system connects the components of the post treatment facility. Due to the different ranges in temperatures, expansion joints, and fixed and floating bearings must be built in so that the facility can be connected to the steel base frame free of tension.

This custom piping is a part of an exhaust air treatment facility for BASF in Antwerp. The customer provides production drawings and parts lists. All welding is done by certified welders and the welding process is verified by welding procedure qualifications. The requirements for welding companies are met as per DIN EN ISO 3834 – Part 2. After verification of gas tightness, heating coils are placed on the surface of the piping followed by insulation with mineral wool.

Venturi nozzles or Venturi tubes are used in pipe systems, in which the rate of air flow must be continually measured and recorded. At the same time the components and the methods used for measuring must be suitable for the demanding industrial marginal conditions and the media with which they come in contact. The diameters used for the reductions, as well as, where the measurements are taken, conform to the diameters where the tubes connect in the system and with the amount of air that needs to be measured.

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