FlexCom composite flat belt expansion joints are designed to reliably perform in high temperature (up to 1800°F), low pressure gas transfer environments, such as pollution control and exhaust management.

Many of these applications involve gas streams with high levels of particulate contamination. The exhaust of a cement kiln, for example, commonly contains calcium carbonate, calcium oxide and fine metallic dust - any of which will subject the flue gas side of a flat belt expansion joint to significant risk of abrasion. Over time, this abrasion can damage the joint and ultimately cause it to fail.

To ensure the ongoing reliability of your expansion joint, our designs include several features that provide high abrasion resistance even under high temperature conditions. Depending on the temperature and pressure load tolerances required by your application, the interior surface of FlexCom flat belt expansion joints may be fabricated from either a high performance, vermiculite-coated fiberglass cloth or a heavyweight silica cloth with an abrasion resistant coating. The belt edges are also protected by a vermiculite-coated fiberglass cloth.

Additionally, we offer two other optional features for reducing abrasion:

• Flow Liners. Also called a baffle plate, a flow liner is installed on the flat belt's interior surface to deflect gas flow away from the flexible components of the expansion joint. Commonly fabricated from stainless steel, flow liners can also be made from carbon steel, corton or AR plate.

• Accumulation Pillows. An accumulation pillow, made from a high performance insulating material wrapped in stainless steel mesh, is installed within the space between the flat belt's interior surface and its flexible outer wall. Pillows are commonly used to protect the joint's flexible components from abrasion, but also serve to reduce the joint's temperature and reduce damaging movements (“flutter”) caused by pressure changes in the gas stream.

  Learn more about the optional protective features that we use in our flat belt expansion joint designs.

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