March — 2012 — The Expansion Joints Blog


Archive for March, 2012

U.S. Bellows: Expansion Joints In-depth Webinar

March 29th, 2012 Comments off

U.S. Bellows: Expansion Joints In-depth Webinar

Date: Thursday, April 12, 2012 / Time: 10:00 am CST

This Webinar is over, to view the recording, please visit:

* Live Webinars are approved for 1 PDH credit for TX P.E.’s

Register for the New U.S. Bellows Expansion Joints In-depth WebinarGet to know U.S. Bellows from introducing our team and manufacturing capabilities to exploring design details in technical drawings for large-scale projects. View case studies that lead to the creation of new standards and designs. Learn about cost saving measures for expansion joint failures and how to prevent future problems.

U.S. Bellows, Inc., a division of PT&P, has more than 50 years of experience designing and manufacturing expansion joints, along with replacement and repair services.

Browse Our Brand New Fabric Expansion Joint Catalog Online

March 26th, 2012 Comments off

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!

  1. Learn About Fabric Expansion Joints
  2. Find the Right Fabric Expansion Joints by Applications & Conditions
  3. Fabric Expansion Joint Design Styles
  4. Fabric Expansion Joint Materials

12″ Dia. Universal Expansion Joints with Stainless Steel Bellows

March 26th, 2012 Comments off

12" Dia. Universal Expansion Joints with Stainless Steel Bellows

These universal metallic expansion joints were custom designed for a chemical plant in Texas. They are fabricated entirely from stainless steel with 304 stainless steel bellows. The expansion joints are 12" diameter, 77-1/2" long and designed for 4-1/2" axial movement and 2" lateral movement. They were designed for 200°F and 100 psig. Each unit was 100% dye penetrant examined and hydrotested prior to shipment.

102″ Dia. Tied Universal and Hinged Expansion Joints

March 12th, 2012 Comments off

102" Dia. Tied Universal and Hinged Expansion Joints

U.S. Bellows designed and fabricated tied universal expansion joints and single hinged expansion joints for a power plant in Canada. All the units were fabricated from carbon steel with 316 stainless steel bellows. The universal tied joints are 102″ diameter, 225″ long and are designed for 8.2″ lateral movement. The hinged joints are 102″ diameter, 71″ long and designed for 0.76° angular rotation. Each expansion joint can withstand temperatures up to 250°F at 7.25 psig. The bellows and pipe long seams were 100% x-rayed, and all the welds were 100% dye penetrant tested. A soap and air test was performed prior to shipment.

102" Dia. Tied Universal and Hinged Expansion Joints

Where Fabric Expansion Joints are Typically Used in a Fossil Fired Power Plant

March 2nd, 2012 Comments off

See an example of how fabric expansion joints are being used with ducting. The figure below represents a typical balanced draft system with a “cold” precipitator. The black components represent the locations of fabric expansion joints throughout the system.

Expansion Joints in a Typical Blanced Draft System with a Cold Precipitator

**The examples above are representative and should not be used for design. The user should obtain actual values for the particular system being considered

The main sections of the ducting are as follows:

  • FD Fan to Air Preheater
  • Air Preheater to Boiler
  • Air Preheater to Pulverizer
  • Air Preheater to Inlet from Boiler
  • Air Preheater to Precipitator or Bag house
  • Precipitator or Bag house to ID Fan
  • ID Fan to Scrubber
  • Scrubber to Stack



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