For low pressure, high temperature gas transfer applications that require greater stress tolerance than a U-belt fabric expansion joint can offer, FlexCom offers a complete line of custom composite flat belt designs. Our custom flat belts are designed to accommodate gas pressures up to 10 psi (.7 bar or .7 kg/cm) and continuous operating temperatures as high as 1800°F.

The exterior flexible layer of a FlexCom flat belt is made from ChemShield, our trademark barrier fabric. Fabricated from one or more layers of 100% PTFE thermoplastic film laminated to a high performance fiberglass cloth, ChemShield offers exceptional protection from high temperature stresses present in both the exterior and interior environments. The flat belt's stainless steel frame and metallic components also offer an enhanced tolerance to higher gas pressures.

Depending on the belt model, the interior layers of a FlexCom flat belt expansion joint are made from high performance fiberglass cloth and layered ceramic insulation.

In certain gas transfer applications, pressure changes within the gas stream can cause unwanted excess movement (“flutter”) in the joint's flexible belt. This can cause damage to the flat belt over time, reducing its effectiveness and operating life span. FlexCom's composite flat belt joint designs optionally include an accumulation pillow designed to reduce flutter, while increasing the flat belt's overall temperature tolerance and protecting it from damage caused by particulate accumulation.

We do not recommend installing a U-belt composite flat belt in a system requiring gas pressure tolerances above 10 psi. For applications requiring higher pressure tolerance, we offer a complete line of custom metal bellows designs.

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