The II MD system
The II MD system is a single-walled exhaust gas system that is made from stainless steel for operating in overpressure conditions up to 600 °C. The thermal buoyancy drops and the exhaust gases must be extracted mechanically by means of a fan because the exhaust gases cool down below the dew point. This feature requires a clearly high degree of leakproofness in the exhaust gas conduit.
The system is used for assembling chimney stacks in calorific systems and in block-type combined heat and power stations. The clear distance between the tube's wall and the chimney stack's wall must be at least 3 cm for a chimney stack with a circular cross-section, or at least 2 cm for a chimney stack with a rectangular cross-section. The system is manufactured with diameters from 80 mm to 600 mm.