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.
What is axial extension on a fabric expansion joint?
August 1, 1990
Tag: fabric expansion joint
What is the breach opening for on fabric expansion joints?
It is the opening in the duct where the expansion joint is installed.
What is axial compression on a fabric expansion joint?
July 31, 1990
The reduction in the breach opening along the axis of the duct. This is usually a result of thermal expansion of the ducting.
What is a mating flange on a fabric expansion joint?
It is a structural angle or channel that is welded to the end of the ducting facilitate bolting or welding the expansion joint into the system.
What acceptance criteria do you use for air testing the fabric expansion joints?
We do not air test fabric expansion joints; all welds are liquid penetrant tested.
When do we use a rubber molded expansion joints?
The rubber molded expansion joint would be used for water services or applications with low temperature.
What does installed length refer to in a fabric expansion joint?
The installed length is the overall face-to-face length of the expansion joint to be installed.
Is there any other type of high temperature material that can be used other than metal?
We can also do fabric expansion joints but that would be for a very low-pressure application.
What fabric is used in manufacturing expansion joints?
The fabric is comprised of various layers:
- Inner layer: Comprised of highly thermal and abrasive resistant fabric material. It is usually used for 1000 degrees F plus working conditions.
- PTFE/Fiberglass Composite LFP Corrosion Lined: The LFP Corrosion liner is 100 percent PTFE material that is capable of resisting the stress cracking caused by flexing and severe temperature fluctuation.
- Thermal Ceramics Fiber Blanket: This layer provides excellent resistance. It can withstand temperatures up to 2300 degrees F and chemical attack.
For pipe stress analysis purposes, are there detailed engineering data on the lateral, axial, bending, and torsional stiffness’s of your fabric expansion joints?
The fabric joints do not have stiffness values as the metallic bellows do.
What is the maximum pressure for a fabric expansion joint?
Fabric Expansion JointThe maximum pressure for fabric expansion joints is 100 inches of water or 3 PSIG. (pounds per square inch)
Are neoprene and rubber expansion joints good for high temperature apps (600 deg. F)?
These expansion joints are not a good solution for high-temperature applications. The neoprene tends to burn at approximately 250 deg. F.
How many layers are in a non-metallic expansion joint?
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.
Do you manufacture fabric joints in any other material beside PTFE?
We do manufacture fabric expansion joints with other types of materials if the customer specifies it. Please see some of the materials here:
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For rubber bellows in CAESAR, do we need to specify any stiffness, since it is typically low?
Yes, the rubber expansion joints do have spring rates and that are required to be input into the stress model.
