Fixing Types

Belt Expansion Joints

The belt design is the simplest way to join an expansion joint to a pipeline. For small dimensions and round duct cross sections, the expansion joint is attached directly to the pipeline using clamps. This design can be used for maximum temperatures of up to 400 °C.

For temperatures greater than 400 °C, there needs to be a distance separating the expansion joint and duct. Angle profiles are also welded on, to which the expansion joint is then fixed using clamp bars. The height of the duct angle is dependent on the medium temperature, and is between 100 and 200 mm. The clamp bars must be designed with slotted holes to allow the expansion joint to be pressed on. For rectangular ducts, the corners must be furnished with a radius that corresponds to the height of the angle profile.

For high temperatures, we recommend that the duct angle be edged in order to reduce heat stress. This design is suitable for both round and rectangular ducts.

To shield against high temperatures, these expansion joints are often furnished with pre-insulation. In conjunction with a lined duct, such a design can be used up to 1200 °C.