In North America, there is an ongoing effort to repair the effects of corrosion in large boilers and pressure vessels. In recent years this work has been done from scaffolds erected in the boiler or vessel. The largest pressure vessels in British Columbia are known as Kamyr Digesters, and are found in Kraft pulp mills. The boilers are found in pulp mills across Canada and the USA, and in thermal power plants in east of the Rocky Mountains in Canada and across the USA. The scaffold structures are made up from 50 mm diameter steel columns and struts that are assembled with steel wedges.
The present state of ventilation design for industrial premises follows rules of thumb or other rules based on sometimes questionable experience. During the last years increasing effort has been successfully invested into research work to enlarge the theoretical and practical knowledge of industrial ventilation. One of the practical results of that research work has been national guidelines (in Germany e.g. VDI 3802) which give more or less detailed recommendations for the design process.
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