When duct sections are bolted together, what is usually included for sealing?

When duct sections are bolted together, a gasket is typically included for sealing to prevent air leakage and ensure efficient operation. Gaskets are made from various materials, often rubber or other compressible materials, that can create a tight seal between the surfaces of the duct sections. This sealing is crucial in many applications because even small leaks can lead to loss of efficiency, increased energy costs, and potential contamination of the airflow.

Gaskets work by filling in any gaps between the two bolted surfaces, maintaining the integrity of the system under pressure and vibration. This makes them an essential component in duct connections. The materials and design of gaskets can vary depending on the specific requirements and operating conditions of the duct system, including temperature, pressure, and the type of fluids or gases being transported.

Other components like wedges, pins, and packing serve different functions and are not primarily intended for sealing duct joints. Wedges are often used for positioning or securing parts but don't provide a seal. Pins may retain parts but aren't designed to create a sealing interface. Packing generally relates to sealing rotating shafts or valves rather than duct connections.