Spiral air duct generally refers to spiral-formed ductwork used for ventilation. Spiral steel pipe commonly refers to a steel pipe manufactured with a spiral weld. The shared word spiral does not make the two interchangeable.
For spiral steel pipe, specify the application, steel grade, outside diameter, wall thickness, length, welding and coating requirements. Pressure, process or structural duties require the project specialist to define the applicable technical and inspection requirements.
For spiral air duct, include ventilation duty, sheet material, connections and sealing requirements. Complete drawings and schedules help clarify the supply scope and interfaces.
