A fabric expansion joint is a multilayer mechanical component. The belt material cannot be selected correctly without the movement table, duct geometry and process conditions.
Geometry
Provide inside duct dimensions, face-to-face, flange / frame arrangement and an approved drawing or measurement sketch.
Movement
State axial compression / extension, lateral movement and angular movement. Clarify whether movements occur simultaneously and whether installation offset is required.
Process conditions
Normal and excursion temperature, pressure / vacuum, gas chemistry, moisture, dust loading and any wash / condensation event should be defined.
Existing failure
Cracking, delamination, abrasion, heat damage, leakage and frame corrosion point to different corrective actions.
Installation context
Nearby duct support, misalignment, insulation, external weather exposure and access influence the final design and replacement scope.
