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Categories - Frequently Asked Questions (FAQ)

Category Articles
For rubber bellows in CAESAR, do we need to specify any stiffness, since it is typically low?
Added on Thu, Nov 3, 2011
Yes, the rubber expansion joints do have spring rates and that are required to be input into the stress model. Rubber Expansion Joints Read More
How many layers are in a non-metallic expansion joint?
Added on Sat, Apr 16, 2011
The number of layers or plies is dependent upon the design conditions and we usually limit non-metallic expansion joints to two or three layers. Multi-layer Fabric Expansion Joint Belt Read More
Do you manufacture fabric joints in any other material beside PTFE?
Added on Thu, Nov 3, 2011
We do manufacture fabric expansion joints with other types of materials if the customer specifies it. Please see some of the materials here:  Fabric Materials Comparison Chart Read More
Are neoprene and rubber expansion joints good for high temperature apps (600 deg. F)?
Added on Sat, Dec 10, 2011
These expansion joints are not a good solution for high temperature applications. The neoprene tends to burn at approximately 250 deg. F. Neoprene Fabric Expansion Joint Read More
What is the maximum pressure for a fabric expansion joint?
Added on Wed, Jul 6, 2011
Fabric Expansion JointThe maximum pressure for fabric expansion joints is 100 inches of water or 3 PSIG. (pounds per square inch) Fabric Expansion Joint Read More
What fabric is used in manufacturing expansion joints?
Added on Mon, Feb 7, 2011
The fabric is comprised of various layers: 1. Inner layer: Comprised of highly thermal and abrasive resistant fabric material. It is usually used for 1000 degrees F plus working conditions. 2.  PTFE/Fiberglass Composite LFP Corrosion Lined:... Read More
For pipe stress analysis purposes, are there detailed engineering data on the lateral, axial, bending, and torsional stiffnesses of your fabric expansion joints?
Added on Mon, Jun 18, 2012
The fabric joints do not have stiffness values as the metallic bellows do. Rectangular Fabric Expansion Joint For High Air Circulation Flow Read More
Is there any other type of high temperature material that can be used other than metal?
Added on Sat, Dec 10, 2011
We can also do fabric expansion joints but that would be for a very low pressure application. Fabric Expansion Joint Read More
What does installed length refer to in a fabric expansion joint?
Added on Wed, Jul 6, 2011
The installed length is the overall face-to-face length of the expansion joint to be installed.  Fabric Expansion Joint Measuring 12" Face-to-Face Read More
When do we use a rubber molded expansion joints?
Added on Thu, Nov 3, 2011
The rubber molded expansion joint would be used for water services or applications with low temperature. Rubber Molded Expansion Joint Read More
What acceptance criteria do you use for air testing the fabric expansion joints?
Added on Tue, Oct 16, 2012
We do not air test fabric expansion joints; all welds are liquid penetrant tested. Liquid Dye Penetration Test Read More
What is axial compression on a fabric expansion joint?
Added on Thu, May 15, 2014
The reduction in the breach opening along the axis of the duct. This is usually a result of thermal expansion of the ducting. Axial Compression Read More
What is the breach opening for on fabric expansion joints?
Added on Thu, May 15, 2014
It is the opening in the duct where the expansion joint is installed. Example Breach Opening Read More
What is angular rotation on a fabric expansion joint?
Added on Thu, May 15, 2014
The twisting of one side of the duct about an axis perpendicular to the longitudinal axis. Angular Rotation Read More
What is axial extension on a fabric expansion joint?
Added on Thu, May 15, 2014
The increase in the breach opening along the axis of the duct. In certain configurations, the duct thermal expansion may result in extension at the expansion joint location. Axial Extension Read More
What is design integration for fabric expansion joints?
Added on Thu, May 15, 2014
In addition to fabric expansion joints, U.S. Bellows is a major designer and fabricator of ducting. Design Integration is the design, manufacture and shipping of expansion joints integrated into the ducting as a complete unit directly from U.S.... Read More
What is a mating flange on a fabric expansion joint?
Added on Thu, May 15, 2014
It is a structural angle or channel that is welded to the end of the ducting facilitate bolting or welding the expansion joint in to the system. Fabric Expansion Joint With Mating Flange Read More
What kind of frame attachment is commonly used for turbulent flue gas and wet gas expansion joint applications?
Added on Thu, May 15, 2014
Bolt-in design for attachment to equipment or duct flanges. (If equipment or duct flanges are not present, weld in designs are recommended.) Turbulent Flue Gas and Wet Gas Expansion Joint Applications Read More
What is the typical operating conditions for high temperature clean air expansion joint applications?
Added on Thu, May 15, 2014
Typical operating conditions are 600 degrees F to 750 degrees F, 5” to 80” WG pressure, clean air media, boiler growth contributes to large axial or lateral expansion joint movements depending on the orientation of the joints. High... Read More
How is a fabric expansion joint defined?
Added on Thu, May 15, 2014
It is defined as an assembly that utilizes a fabric belt element to allow for the movement of ductwork, as opposed to a metal expansion joint which allows for the movement by means of convoluted metal bellows. Fabric Expansion Joints Read More
For fabric expansion joints can the fabric belt withstand thermal, pressure and chemical conditions?
Added on Thu, May 15, 2014
Yes it can. The fabric belt must be able to withstand the thermal, pressure and chemical conditions. Modern fabrics accomplish this with a chemically inert barrier bonded to high strength substrate. For high temperature applications, a... Read More
Where is the gasket installed in a fabric expansion joint?
Added on Thu, May 15, 2014
The gasket is a non-porous deformable material that is installed between the belt attachment flange and the fabric belt. The gasket allows a gas tight seal when the back-up bar clamping action is applied. Fabric Expansion Joint Read More
What is the function of the particulate deflector on a fabric expansion joint?
Added on Thu, May 15, 2014
In certain conditions, a particulate deflector can be specified to reduce air born particulate from falling down into the expansion joint cavity. This is most common on vertical ducting with the flow directions up and an upstream liner overlapping... Read More
How is the Flexxcell FF1 manufactured?
Added on Thu, May 15, 2014
Flexxcell FF1 is manufactured to a high weight without sacrificing the critical flexing properties required for a fabric expansion joint. FLEXXCEL FF1 Read More
What tools are needed to install a fabric expansion joint assembly?
Added on Thu, May 15, 2014
Tools needed include: Suitable/safe scaffolding, Lifting equipment (fork lift, crane, hoist), Drill, Come along, Rope, Pry Bar Fabric Expansion Joint Read More
What is unique about the style 200W high temperature dirty flue gas expansion joint
Added on Thu, May 15, 2014
It includes integral telescoping liners to retain the accumulation barrier and protect the belt from abrasion. Style 200W Read More
For fabric expansion joints what type of rotation is the twisting of one side of the duct about the longitudinal axis?
Added on Thu, May 15, 2014
That is called torsional rotation. Torsional Rotation Read More
What is a drawback of FLEXXCEL elastomeric belt materials?
Added on Thu, May 15, 2014
The biggest limitation is the relatively low temperature capability. 1/8" Thick Elastomeric Fabric Belt With Single Ply Reinforcement Read More
On a fabric expansion joint where is the radius corner located?
Added on Thu, May 15, 2014
The belt radius is located at the corner of rectangular expansion joints. The radius corner helps prevent sharp creases that may shorten belt life. Rectangular Fabric Expansion Joint Read More
What are styles of dirty flue gas expansion joint applications?
Added on Thu, May 15, 2014
Styles Include: Style 200W, Style 100W, Style 300W, Style 600W, and Style 700W Dirty Flue Gas Expansion Joint Read More
Where can I store a fabric expansion joint?
Added on Thu, May 15, 2014
Expansion Joints should be stored in a clean and dry environment. However, as a minimum, expansion joints must be stored so that water does not penetrate any closed container. Fabric Expansion Joints Read More
Do the turbulent flue gas and wet gas expansion joint applications have potential for wet conditions?
Added on Thu, May 15, 2014
Yes they do have potential for wet conditions. Turbulent Flue Gas/Wet Gas Expansion Joint Read More
Does the style400B turbulent air expansion joint application require a belt attachment?
Added on Thu, May 15, 2014
Yes it does. This model requires belt attachment nuts to be tack welded. Style 400B Read More
What are FLEXXCEL Flouroplastic materials composed of?
Added on Thu, May 15, 2014
The expansion joint fabric is composed of two components: PTFE resins and fiberglass cloth. FLEXXCEL Flouroplastic Read More
 
 
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