Fabric expansion joints consist of two major components, the fabric belt material and the metal frame. The frame can connect to the ducting by welding or bolting. Each U.S. Bellows frame style has features designed to minimize the detrimental effects of temperature, movements, pressure, media, and turbulence. The U.S. Bellows team is experienced in evaluating application conditions and implementing designs that lead to long term expansion joint service.
Design alterations can include the following:
- Adequate stand off height
- Adequate face to face dimension
- Inclusion of liner
- Frame material
- Belt material
- Inclusion of accumulation barrier
- Inclusion of insulation pillow
- Proper bolt hole spacing
- And more
Although U.S. Bellows can provide weld-in and bolt-in frame styles, wherever possible, it is strongly recommended that the expansion joint be welded in place.
Weld in design frame styles allow the expansion joint to weld directly to the duct or duct flanges. These frames styles are basic designs that can be augmented with optional components.
Benefits of weld in designs include:
- Weld in designs are less expensive to manufacture.
- Accurate field bolt hole dimensional data can be difficult to obtain and verify.
- Welded connections can accommodate “real world” field conditions and inaccuracies that occur during installation.
Bolt in design frame styles allow the expansion joint to bolt directly to duct flanges or equipment flanges supplied by others. These bolt in designs are generally more expensive to manufacture and are potentially more difficult to install due to hole pattern irregularities and inaccuracies. These frame styles are basic designs that can be enhanced with the optional components.
Access our full expansion joint catalog online, anytime. You can also download a PDF version from our site to use offline. If you would like your own copy, please fill out the Catalog Request Form. Our expanded catalog includes:
- Details about our bellows design
- Bellows material characteristics and details
- Types of deflection, including diagrams and examples
- Cyclic deflections and cycle life
- Types of metallic expansion joints (movements, principal advantages, limitations and uses)
- Accessories, including liners, covers, purge connectors and limit rods
- A full installation and maintenance guide, including the “Do’s and Dont’s” from EJMA
- Inspection criteria and typical causes of expansion joint failure
- Details on expansion joint design, pipe guide spacing, and flange data
- Sample applications and examples
- Glossary of terms
- Safety recommendations
- Equivalency charts
- Terms of sale
Check out our new fabric expansion joint catalog online as well.
View the basics about fabric expansion joints, including how they work and some design integrations. Also learn about the factors that influence their design like: temperature, chemical attack, movements, abrasion, pressure fluctuations and summation. Read about fabric expansion joint applications, frame styles, materials, inspection and installation.
U.S. Bellows is proud to release our online fabric expansion joint catalog!
Fabric expansion joints perform a function of compensating for duct misalignment and duct thermal growth typical in power plants and other ducting systems. Fabric expansion joints are found wherever there is a need to convey hot media in low pressure applications such as “in flowing air” and “out flowing gas” in large combustion processes.
Browse our fabric expansion Joint catalog!
- Learn About Fabric Expansion Joints
- Find the Right Fabric Expansion Joints by Applications & Conditions
- Fabric Expansion Joint Design Styles
- Fabric Expansion Joint Materials
Do you know how to specify a U.S. Bellows expansion Joint?
Use our model number key to find out the:
- overall length
- expansion joint type
- expansion joint material
- design pressure
- flange/weld ends material
- liner material
- cover material
- tie-rods material
This expansion joint is 10" diameter, 15" overall length, universal type (meaning two bellows), 321 SS (stainless steel) bellows, 150 psig, 321 SS flange and weld ends, 321 SS liner, carbon steel cover and 304 SS tie rods.
Need assistance? Write us at firstname.lastname@example.org or call us toll-free at 1-800-787-5914
To get your copy, fill out the request form. A number of improvements have been implemented based on valuable feedback from our customers and engineers.
- all new photographs
- a brand new section on past projects
- more expansion joint data tables
You can now download the expansion joint data tables from our online catalog.