Fabric Expansion Joint

OVERVIEW: We offer a full range of quality non-metallic “fabric” belt type, and also integrally flanged fully molded type, duct expansion joints for lower pressure gaseous service, including high-temperature flue gas. 

The fabric belt joint types combine different steel frame types with elastomers, fluoropolymers, or composite layered materials for complete versatility.

The fabric belt joint types combine different steel frame types and industry proven materials and options. In some instances, additional components such as insulation pillows, accumulation barriers or flow liners are used to help protect the fabric material. The basics are shown below, but a number of other design elements are possible.

The belt type uses a flat belt flexible element made as a flat belt,and is versatile and effective interms of manufacture and installation.And they allow many different types of frames to suit operating conditions. Various baffles (liners) are also commonly used, depending on the service.

Attachment methods of the frame to the duct include bolt frames to mating flange, weld frames to mating flange, and weld frames to duct end.

Chemical resistance, temperature limitations, abrasion resistance, tensile strength and susceptibility to flutter / vibration are major considerations. When selecting a flexible element fabric material. They are configured either as a flat-type or convex type.

Materials include elastomers, fabrics, insulation materials and fluoro plastics, either constructed in a single layer or multiple layers. See below for the more common material choices, along with allowable movements for  various face-to-face widths.