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Almost every generator application has an exhaust system designed to route exhaust gases out of the engine room. More importantly, the exhaust system usually includes the expansion joints between the engine and the silencer to compensate for the moments and heat expansion. One of the most popular and cost-effective choices are bellows expansion joints. These bellows expansion joints are made of single-ply corrugated stainless steel, which allows the absorption or isolation of the fast (but small) engine vibrations from the rest of the exhaust piping. The standard overall length of the bellows expansion joints is usually 18”; however, other lengths are available upon request. Typical expansion joints usually allows about 0.25” deflection on a 12” length flex hose.

Nett Technologies’ expansion joints are available in many configurations: with the ANSI pattern flanges (fixed or floating), engine specific flanges (MTU, Caterpillar, Kohler, Cummins, etc.), NPT connections, slip-on, etc. Standard end-connections are made of the Carbon Steel, however, other materials such as Aluminized Steel, Stainless Steel 304 or 316 are available upon request.

Looking for more information on the Silencer Accessories? Contact us at (800) 361-6388

Nett Technologies’ Expansion Joints Features:

  • Flex is made of single-ply stainless steel annular hose. End connections are carbon steel (available in stainless steel).
  • Versatile connections, including ANSI pattern flanges (fixed or floating), NPT, slip-on, engine flange (Caterpillar, Cummins, MTU, etc.), schedule 40, and others.
  • Customized engineered systems solutions are available to meet challenging integration and engine requirements.
  • Maximum working pressure @ 1200°F is 5 PSIG. All tabulated movements are non-concurrent. Axial movements vary depending upon overall length.
  • Standard overall length: 18”. Other lengths are available upon request.
  • Responsive lead time for both standard and custom designs to meet your needs.

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Please note it is very important to choose the right type of flex connector for your application. If your power generator silencer exhaust system anticipates a lot of lateral and axial movement, it’s highly recommended to use double-ply bellows instead. Single-fly flexes are not designed to withhold the compression, nor are they designed to absorb the thermal pipe expansion. If the flexible connector bulge or turn into s-shape, it means that is hasn’t been installed properly, and therefore, its movement retaining capabilities are now compromised. It’s also important to align the inlet and outlet of the flex, as single-ply flexes are not designed to compensate for the piping misalignment. If you are looking for more information about any of the products, please contact one of our representatives at [email protected] or at 800-361-6388. Our professional and experienced team will help you to choose the right option for your application.

Nett Technologies is your one-stop solution for all your generator exhaust needs! We offer a wide range of standard flexible connectors and bellows, as well as custom options to fit your application needs.

We also offer many other silencer accessories! Please see below.

Download our full Silencer Accessories Catalog today

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