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Hot exhaust gas from parallel oven shafts is extracted through 6-10 flexible and valve controlled branches and discharged through the main pipe. The manifold has a diameter of approx. 1 m, is continuous welded and can be assembled as one solid piece.

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.

Stainless steel 1.4541 is used in exhaust gas lines and stacks discharging furnace exhaust air with maximum temperatures of approx. 450° - 500°C. Depending on the type of fuel, exhaust gases contain among other things sulphur dioxide or nitrogen oxides (SO2 or NOX), which in water form sulphuric acid or nitric acid. Particularly facilities that are not in continuous operation are at risk of this, for example, through the build up of condensation. During the design process, the demands that the temperature place on the material must be considered as well as the protection needed to prevent corrosion.

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.

Stainless steel pipes for regenerative thermal oxidizer – RTO facilities at Exxon Mobil. The material is certified and PMI-tested (Positive Material Identification) on account of the refinery industries’ extremely rigid requirements for documentation, traceability and inspections. All welding is carried out under welding procedure specifications and qualifications. Non-destructive testing and approvals are done by TÜV, MTL and DEKRA.

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.

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