Structural Process Ductwork
Structural process ductwork carries large volumes of high temperature, dusty air, between pieces of process equipment. The design of this ductwork requires an understanding of the interaction of heat softening of metals, potential effects of dust buildup in large ductwork, and structural design principles. there are two basic shapes for structural process ductwork, rectangular and round. Rectangular ductwork is covered be the ASCE "The Structural Design of Air & Gas Ducts for Process Power Stations and Industrial Applications".
In the practical design of primarily round structural process ductwork in the cement, lime and lead industries, the duct size involved range from 18 inches (45 cm) to 30 feet (10 m). The air temperature may vary from ambient to 900 °F (490 °C). Process ductwork is subject to large loads due to dust buildup, fan suction pressure, wind, and earthquake forces. As of 2009 30 ft diameter process ductwork may cost $7,000 per ton (2012). Failure to properly integrate design forces may lead to catastrophic duct collapse. Overdesign of ductwork is expensive.
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