The Expansion Joints Blog

42″ Dia. Single Tied Expansion Joints Designed for a Solar Electric Generation Facility

November 26th, 2012 Comments off

42" Dia. Single Tied Expansion Joints Designed for a Solar Electric Generation Facility

These single tied expansion joints are 40″ and 42″ diameter, and were designed for a solar electric generation facility. The bellows and flow liner are 304 stainless steel. The stub ends are fabricated from carbon steel. The expansion joints were designed for a lateral movement of 1/2″, and 15 PSIG at 250°F. They were 100% dye penetrant examined and hydro-tested prior to shipping to California.

Installation Instructions for Assembled Fabric Expansion Joints

November 18th, 2012 Comments off

Fabric expansion joints can be shipped in a variety of conditions to allow for the most economical installation. In certain instances, it is practical to ship joints fully assembled ready to drop into place. In other cases where access is limited or joint size exceeds normal shipping constraints, the joint can be broken down into small segments and then assembled in place at the job site.

U.S. Bellows will provide the appropriate detailed storage, handling, and installation instruction based on how the expansion joint is shipped.Please use these instructions for assembled fabric expansion joints in conjunction with the approved drawing provided by U.S. Bellows.

Pre-Installation Check-list:

  1. Confirm dimensional data per U.S. Bellows’ approved drawing.
  2. Confirm duct/duct flanges are in good condition.
  3. Confirm duct/duct flanges are lined up correctly (ensure that lateral displacement and angular movement do not exceed agreed specifications)
  4. Prior to installing the expansion joint frames, the opening into which the expansion joint will be installed must be inspected to verify that the opening is in accordance with design tolerances. The expansion joint is not designed to accommodate installation misalignment, unless clearly specified as a design requirement.
  5. Make available the following tools/equipment to simplify the installation:- Suitable/safe scaffolding
    - Lifting equipment (fork lift, crane, hoist)
    - Drill
    - Come along
    - Rope
    - Pry Bar

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Guide to Selecting an Elastomeric Belt Material

November 12th, 2012 Comments off

1. Compare the maximum continuous operating temperature of the application against the fabric temperature rating.

2. If the application has high fly ash or dust loading, select a material with high tensile strength.

3. If the application is near a fan or where flow turbulence is expected, select a material with high flutter resistance.

4. Elastomers vary in their chemical resistance. The selected Elastomer should be checked to insure that it is compatible with the particular media it will encounter.

Material Name Elastomer Temp. (F) Service Tensile Strength Flutter Resistance
FLEXXCEL RH125 Hypalon 225 Dry Medium Medium
FLEXXCEL RE125 EPDM 300 Wet* Medium Medium
FLEXXCEL RE25 EPDM 300 Wet* High High
FLEXXCEL RC125 Chlorobutyl 300 Dry Medium Medium
FLEXXCEL RC25 Chlorobutyl 300 Dry High High
FLEXXCEL RVF25 Fluoroelastomer 400 Wet Medium Medium
FLEXXCEL RVF25 Fluoroelastomer 400 Wet High High
FLEXXCEL RVF25M Fluoroelastomer 400 Wet High High

* Not suitable for sustained service where oils, hydrocarbons or concentrated minerals acids are present.

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

November 8th, 2012 Comments off

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

This Webinar is over, but you can view the recording at:  http://info.usbellows.com/instantly-access-webinar-archives/

* 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.

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60″ Dia. Pressure Balanced Elbow Expansion Joint for a Power Generation Plant

November 5th, 2012 Comments off

Pressure Balanced Elbow Expansion Joint

This pressure balanced elbow expansion joint is 60″ diameter and 240″ overall length and was custom designed for a power generation plant in South Carolina. It was fabricated from carbon steel with 304 stainless steel bellows. The expansion joint was designed for an axial compression of 1″, lateral of 1″, and 100 PSIG at 100°F.

Flexxcel Elastomeric Materials for Fabric Expansion Joints

October 28th, 2012 Comments off

Elastomers— A general name for the group of synthetic “rubber” materials that are characterized by their elastic property. These materials are also known by their commercial names as Viton®, Hypalon®, EPDM, and Chlorobutyl.

Before the development of Fluoroplastics, a group of synthetic “rubber” materials were commonly used in flue duct expansion joint applications. These materials, known as Elastomers, include Viton™, EPDM, Chlorobutyl, Hypalon™ and others.

Because of their elastic properties, the various Elastomers are built up into a multi-layered sheet reinforced with fiberglass or Aramid fabric. The finished product, 1/8″ to 1/4″ thick, is then used as a flat belt or as an integrally flanged U-shaped cross section that bolts directly to duct or equipment flanges. The inherent characteristics of flexibility, abrasion resistance, and flutter resistance translates to long service life when applied properly.

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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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Fabric Expansion Joints Custom Designed for an Offshore Oil Extraction and Natural Gas Project

October 20th, 2012 Comments off

Round Fabric Expansion Joint
These fabric expansion joints were custom designed for an offshore oil extraction and natural gas project. They are 105″ dia. x 24″ O.A.L. 309 stainless steel was used for the duct, 310 for the liners, 316 for the covers, 321 for the studs, 309 for the flanges. The fabric belt was a three layer belt with an inner layer of glass cloth, a layer of KO wool and an outside layer of reinforced PTFE. The expansion joints were designed for 1 psig at a temperature of 1100°F. They The were designed for 4″ axial compression, a 1″ extension, and a 0.5″ lateral offset. All welds were dye penetrant examined.

Application Specific Materials for Flexxcel Fluoroplastic Expansion Joints

October 15th, 2012 Comments off

Fabric belt material selection is a critical factor in the successful design of each fabric expansion joint. View the different application specific materials for our Flexxcel Fluoroplastic joints.

Flexxcel HC40 For Highly Corrosive Applications
Flexxcel HC40 for Highly Corrosive Applications

*colors used to differentiate layers

  • LFP™ is an all PTFE material that is flexible, resists tearing and has superior flexing capabilities compared to other PTFE products.
  • Water StampBecause this is an all-PTFE product with excellent mechanical capability, no compromising reinforcement that can be chemically attacked is needed.
  • Regardless of the chemical exposure, LFP™ eliminates concern for chemical attack. This has been proven in laboratory and industrial service where, in all cases and regardless of chemical environment, LFP™ has retained all of its physical properties.
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    Read more on Application Specific Materials for Flexxcel Fluoroplastic Expansion Joints

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