REDWIRE The strict design criteria for expansion joints from Sudbury International

December 17, 2019 REDWIRE is news you can use from leading suppliers. Powered by FRASERS.

Posted by Sudbury International Engineered Products Limited


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design criteria

Expansion joints for ducting have strict design criteria, according to the FSA.

Sudbury International Engineered Products Limited is trusted for its inventory of expansion joints for ducting systems. Manufacturers of these joints must adhere to strict design criteria to create products that are reliable and last for long lifespans. While custom designs are possible for specific applications, there is still a basic template to follow. The Fluid Sealing Association (FSA) in the United States offers the following guide to expansion-joint design aspects.

Pressure, temperature, and movement

When a customer approaches Sudbury International for custom expansion joints for ducting systems, there are several design criteria to consider, according to the FSA. Among the most important things to keep in mind are service, plant type, and facility location. This gives the supplier an idea of the demands the customers will put on the joints, unlike information on specification sheets. Other examples: type of fuel, peak or base load, number of start/stop cycles per year, and whether installation is indoors or outdoors.

Another key criterion is the medium. Knowing if it is air, flue gas, or otherwise helps to select materials and the design of baffle construction; other important factors include chemical composition, medium condition, dust contents, flow velocity and volume, and whether the turbine is washed. Additionally, the system-operating pressure can affect expansion joints’ design, particularly regarding their flexible nature. Pulsation and flutter are major design criteria to consider.

Knowing the operating, design, and ambient temperatures helps manufacturers of Sudbury International expansion joints calculate temperature gradients during joint construction; it also helps to know medium, dew-point, and max excursion temperatures. In addition, the required active length typically depends on the level of movement: the material for the number of layers and types affects the relevant flexibility of the individual product.

Duct geometry is another vital criterion. Consider duct size, thickness, material, corner angles, and insulation before completing a quotation, along with flange-connection size and material. Finally, scope of supply is important. Manufacturers can supply or all of these relevant requirements, like belt and flange, type, insulation pillow, flow liner, gaskets, backup fasteners, installation, supervision, mounting/attachment frame, and splicing.

For more information, contact Sudbury International.


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Posted by Sudbury International Engineered Products Limited


Expansion Joints, (fabric, metal, rubber, dog-bone), Automatic Recirculation Valves For Pumps, Specialty Sootblowers, Se... Read more

Contact supplier