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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.

Pressure piping and suction piping for filter systems. The bend has a streamlined design with a large radius for a better transportation of the dust. The centrifugal fan creates high overpressures and low-pressures that must be accommodated by the piping system without excessive deformation. Flange connections are required for the assembly and are to be provided by the customer. These allow for an easy exchange of individual components in case of later wear and tear.

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.

Pipe lines used for chemicals are designed in stainless steel. Depending on the corrosion load, simple or high-quality stainless steel, for example 1.4539, is chosen. Alternatively, additional interior coatings are an option, provided that the medium is not abrasive and the operating temperature is not too high. Expansion joints – shown in this project as stainless steel expansion joints – must be accurately specified with respect to required radial and lateral absorption of movement. This is, among other things, a result of the piping network calculations.

LBF builds stainless steel tanks and vessels in virtually any design: round, rectangular, Non-pressure, pressure vessels, all with or without interior fittings. In this project, the stainless steel vessel is used as an unpressurised filter with a supported intermediate floor and covered with perforated sheet metal to hold filter material. The design data – main dimensions, required volume, connection openings – is customer specified. The details of the design are determined during the drafting.

The pipe system consists of various divider pipes that connect tanks with different components of the facility – e.g. ventilators, heat exchanger, absorber, catalyser, UV reactor. The challenge here is that the divider pipes have varying degrees of temperature and that the operating status can also fluctuate. The facility is planned by the customer (including choice of material and dimensions). LBF completes the plans by deciding on the thickness of the sheet, the expansion joints, floating bearings, slide bearings, fixed bearings, as well as thermal decoupling.