What do exhaust bellows do

Recent Posts. A Marmon Connection is a method to join an exhaust connection together. It is a best pra …. Where the amount of axial movement is outside of the capacity of a single bellows, a double expansion joint may be necessary. When the unit is required to accept a significant amount of lateral movement, including applications where axial movement is applied simultaneously, a double bellows is usually the preferred option. A double bellows unit has a intermediate pipe between the bellows and sometimes this is an integral part of the bellows tube reducing the need for welded joints.

Exhaust expansion joints from Belman are designed to be as light as practically possible to give minimum loads on hangers and pipe supports. Further, the bellows technology, often incorporates multi layers, giving maximum movement and flexibility for minimum deflection forces and good fatigue properties with good performance in conditions where vibration prevails.

Exhaust expansion joints are generally unrestrained so the pressure force generated by the bellows when pressurised , together with the deflection forces resulting from movement, must be contained by the system fix points and guides. At high temperatures or where the flow velocity is high, Belman always recommends an inner sleeve in the bellows. The inner sleeve protects the bellows against abrasion from any particulate matter in the flow medium and helps to smooth the gas flow over the convolutions which helps in the reduction of turbulence.

It can also help to reduce the temperature of the bellows in the expansion joint. Exhaust expansion joints are used in a wide range of applications including gas turbine exhausts, power units, generator sets, marine propulsion systems, OEM engines and auxiliary systems.

Customised expansion joints can be designed and built for any specific requirement and application. Most commonly exhaust bellows are constructed from stainless steel but these also can be found in stainless steel for extreme high heat applications.

A Bellow gives movement to your wastegate or exhaust pipes, these are also commonly used for turbo manifold cross-over pipes aswell. When fabricating this type of component the alignment can be tricky at the best of times especially when using stainless steel, this material is renowned for alot of movement when welding. This movement also happens under general everyday use aswell, when pipes heat up they expand and this is one of the main reasons to use an exhaust bellow, to enable the pipes to move and expand without stressing other areas of your pipe work.

These two options visually are very different but there purpose is quite the same. An exhaust bellow or exhaust flexi joins main job is to give movement to the tubes they are attached to. Without the use of these you will have a much greater chance of your pipes cracking from either thermal expansion or general movement and vibration.

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