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Absorber Ductwork Exoskeleton

About the project

Project category

Industrial

Company / Project parties

Ruby And Associates

Location

U.S.

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Absorber Ductwork Exoskeleton

Colorado Springs Utilities is constructing and commissioning innovative technology to reduce SO2 emissions at one of its power plants. During pilot testing of the technology, researchers determined the best configuration of ductwork for the system was a combination of reinforced fiberglass (FRP) with a steel exoskeleton.

The benefits of FRP come with drawbacks that had to be overcome by a structural steel exoskeleton. The skeleton had to provide strength and stiffness for the duct while at the same time allowing for thermal expansion of the FRP. This meant no internal bracing typical of steel ductwork, and the only connection between the two materials was with slotted clips and UHMW shims. Because the steel would be galvanized, then mated to the FRP panels at a shop, it had to be designed in 8’ to 10’ wide modules for shipping, while minimizing loose field pieces.

The system is made up of six duct units between 20 feet and 55 feet high and weighing up to 130,000 lbs. The team built custom components to streamline connecting the model and FRP attachments, and wrote custom reports to communicate material and shipping lists in a format the client could more easily use. They detailed the structural steel in-house due to the complexity of the geometry and FRP mating and to minimize the project schedule.

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