Uncategorized — The Expansion Joints Blog


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Types of Metallic Expansion Joints

May 20th, 2013 Comments off

U.S. Bellows offers all types of metallic expansion joints. Each type has advantages and limitations that can provide flexibility, load reduction, structural integrity and reliability required in a piping system.
Metal expansion joints can withstand the design temperatures and pressures, as well as provide the capacity necessary to absorb thermal growth of the piping system. The thermal movement required can be axial, lateral or angular. In some cases, the pressure thrust of an expansion joint must be restrained by the use of tie rods, hinges or a gimbal while allowing the bellows to move through its design deflections.

Learn more about the different types of metallic expansion joints:

Single Expansion Joint Universal Expansion Joint Hinged Expansion Joint

Expansion Joints


Expansion Joints


Expansion Joints


Elbow Pressure Balanced Expansion Joint In-line Pressure Balanced Expansion Joint
Elbow Pressure Balanced Expansion Joints In-line Pressure Balanced Expansion Joints Externally Pressurized Expansion Joints


Single Expansion Joint Single Expansion Joint Universal Expansion Joint


Expansion Joints


Expansion Joints


Expansion Joints


Universal Expansion Joint


Expansion Joints

Thick-wall (Flanged & Flued)

Expansion Joints

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Congratulations on Winning the EJMA Standards 8th Edition Book!

November 9th, 2012 Comments off




We had a great turnout for our U.S. Bellows Expansion Joint In-Depth Webinar on November 8th. We are proud to announce the winner of our drawing for the EJMA Standards Eight edition Book is Jeffrey!

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Giveaway Winner

October 26th, 2012 Comments off

We had a great turnout for our U.S. Bellows Expansion Joint In-Depth Webinar on October 24th. We are proud to announce the winner of our drawing for the EJMA Standards Ninth edition is George. Be on the lookout for our next giveaway!



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Single Expansion Joint for an Offshore Deep Drilling Platform

October 9th, 2012 Comments off

These single expansion joint are refurbished with 321 stainless steel bellows for an offshore deep water drilling platform. They are 16″ diameter, 21-1/2″ OAL, and designed for 450°F at 8 psig. The expansion joints were dye penetrant examined, and an air and soap bubble test was performed prior to shipment.

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Pressure Balanced Expansion Joint for a Nuclear Facility

September 25th, 2012 Comments off

This pressure balanced expansion joint was custom made for a nuclear facility in Texas. It is 66″ID x 169″ OAL. This expansion joint was fabricated with 304 stainless steel bellows and carbon tee, pipe and tie rods. 100% dye-penetrant and soap and air tested, its operating conditions were 15 PSIG at 300°F for 1 1/4″ axial compression.

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Fluoroplastic Material

September 24th, 2012 Comments off

Fluoroplastics (PTFE) — The chemical resistance of this material is unequaled by other materials.

Chemical resistance, temperature limitations, abrasion resistance, tensile strength and susceptibility to flutter/vibration are major considerations when selecting a fabric material. This article will give you a better understanding on FLEXXCEL Fluoroplastic products.

Evolution of FLEXXCEL Fluoroplastic Materials

  • Fiberglass substrate is thoroughly coated on both sides with a minimum of 35% to 40% by weight of PTFE resin for mechanical strength.
  • Fluoroplastic coating is 100% pure PTFE material.

Fiberglass Coating Process

Fiberglass + PTFE = Coated Fiberglass

  • Fiberglass reinforcement filaments are E grade or better providing excellent tensile strength.
magnified fabric cross section

Extruded, thin single ply film laminated to coated fiberglass.

  • All FLEXXCEL materials have a chemical barrier film to protect the fiberglass substrate and minimize porosity. The chemical barrier component of these materials is in the form of a film that is laminated to the fiberglass cloth.



magnified cross section
  • LFP CrossFilm based chemical barriers are laminated to the coated fiberglass. The use of LFP CrossFilm Chemical Barriers provides superior protection in corrosive environments.

A zero porosity chemical barrier is the most critical component for preventing chemical attack.




  • FLEXXCEL HT series fabric belts rated for temperatures up to 1000°F. Insulation is bonded to FLEXXCEL HD4 material to prevent hot gas from residing between the two components.
  • Extends like of insulation component.
  • Prevents insulation from falling into duct.
  • Makes installation of high temperature composite belts easier.

A zero porosity chemical barrier is the most critical component for preventing chemical attack.


FLEXXCEL Fluoroplastic Belt Materials

Fluoroplastic materials have been successfully used in challenging expansion joint applications since the early 1980′s. The expansion joint fabric is composed of two components— PTFE resins and fiberglass cloth. The fiberglass is used to give the fabric strength. The fiberglass can be of varying weights to give the fabric material the necessary tensile strength. The fiberglass alone is susceptible to degradation from chemicals and liquids. By thoroughly coating all surfaces of the fiberglass filaments, a strong and flexible base material is created. This base material can then be laminated to a PTFE film (Chemical Barrier) of varying thickness to provide a non-porous and chemically inert gas seal. Its virtual inertness to most chemicals make it an excellent choice for applications in wet corrosive environments.

Fluoroplastics also retain their structural integrity at extremely high or low temperatures, i.e., 600 degrees F to -110 degrees F (uninsulated). Fluoroplastics are capable of withstanding temperatures in excess of 1500 degrees F when properly insulated (composite belt).

Features of Fluoroplastics

  1. High strength to weight ratio. Easier to handle and install compared to Elastomers.
  2. Simple splice and repair by means of heat seal iron. Material does not age like Elastomers and therefore can be repaired for the life of the material.
  3. Temperature capability up to 600 degrees F without additional insulation.
  4. Materials are easy to drill and punch.
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Accommodating Expansion in Your Fossil Fired Power Plant

January 12th, 2012 Comments off
We have been continuously adding new Fabric Expansion Joint content to our website. From fabric expansion joint design styles to diagrams and applications, we are creating more and more content in order to answer any technical questions that you may have.

Our most recent addition, the Fabric Expansion Joint Application page, shows you where an expansion joint would be applied within a Fossil Fired Power Plant.

Check out where they fit in between the air heater, scrubber, fans, and more! 

We’re now on facebook! Like our page for a chance to win an iPad 2.

August 9th, 2011 Comments off

Like usbellows new facebook page for a chance to win an iPad 2.We’re now on facebook!

Click the like button for a chance to win an iPad 2.

Our facebook fans are also…

  • the first to see the release of new products
  • included in facebook-exclusive drawings and give-aways
  • have access to the latest technical videos we have to offer
  • able to ask questions and get answers right away

- Drawing will be on Wednesday 8/31/2011 at 12 noon CDT
- Current facebook likers will be included in this drawing
- Winner will be notified by facebook message and has until Friday 9/2/2011 at 12 noon CDT to reply back with a valid mailing address to ship the iPad to (if there is no response by Friday 9/2/2011 at 12 noon CDT, an alternate winner will be selected).


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PDF Downloads Now Available in the Catalog

May 13th, 2011 Comments off

A convenient new feature has just been added to our online expansion joint catalog. On each and every data table,  right above the table,  you will now see a link to download the corresponding PDF file.

Now you can have a print-friendly copy of a catalog page  in your hands within minutes! Check out our various data tables to explore this feature a bit more!

Single Expansion Joints

Universal Expansion Joints

Externally Pressurized Expansion Joints

Get to Know our Team

April 12th, 2011 Comments off

We recently posted a new page that talks about the dedicated team of employees we have at U.S. Bellows that is working around the clock to serve your expansion joint needs. Go check out their photos and see just how many years of combined experience that the U.S. Bellows team offers! Our U.S. Bellows manager, Mr. John Demusz, who often is the voice behind our expansion joint webinars, is shown below:

John Demusz, Manager of U.S. Bellows, Inc.

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Contact Us: +1 (281) 241-9418 Toll Free: (855) 591-0906 Fax: +1 (713) 731-8640 sales@usbellows.com
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