Fabric Expansion Joints | Global Trade leader ecrobot

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Fabric Expansion Joints

Posting date : Jan 22, 2013

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METALS | Iron and s

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72-

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Fabric Expansion Joints perform a function of compensating for duct misalignment and duct thermal growth typical in power plants and other ducting systems. Fabric expansion joints are found wherever there is a need to convey hot media in low pressure applications such as "in flowing air" and "out flowing gas" in large combustion processes. Fabric Expansion Joints can absorb larger movements than metal expansion joints and do so without spring loads. This is critical to limiting thermally induced stresses in ducting, ducting supports, and related equipment. A fabric expansion joint is inserted into a gap in the duct work where movement will occur. A fabric expansion joint has two main components--the fabric gas seal and the metal frames. The fabric gas seal is a closed loop, like a belt, with its two edges clamped all around to the metal frames that are in turn connected to the end of ducting. As the ducting moves, the fabric belt deforms. The fabric material must do this without tearing or leaking while sometimes being exposed to high temperatures and/or corrosive media. In some instances, additional components such as insulation pillows, accumulation barriers or flow liners are utilized to help protect the fabric material. The following section describes the basics of fabric exapsnion joint components and how they are designed. Advantages: 1. Minimize the number of flanged expansion joint connections. 2. Allows integration of ducting to serve as expansion joint flow liner. 3. Allows expansion joint frames to take the place of duct stiffeners. 4. Elimination of labor to install flanged expansion joint assemblies at the job site. 5. Elimination fo flanged connection gasketing and potential leaks. 6. Elimination of the risk of installing sensitive assemblies at the job site. 7. Significant costs savings of both manufacturing and installation labor. 8. Delivery of the largest ”shippable” duct and piping sections to the job site to eliminate as many field connections as possible, further reducing installation labor.