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Categories - Frequently Asked Questions (FAQ)

Category Articles
What are the different types of expansion joints?
Added on Mon, Feb 7, 2011
In general, there are fabric, metallic, and rubber expansion joints. At U.S. Bellows, we manufacture:    * Metallic Expansion Joints Single Expansion Joints Hinged Expansion Joints Gimbal Expansion Joints ... Read More
What is end thrust?
Added on Tue, Oct 16, 2012
It is the force generated due to the pressure inside the expansion joint. Pressure thrust is calculated by multiplying the area of the mean bellows diameter by the pressure.   Bellows "PA" (pressure x area) load Read More
What’s the typical spring rate for a 20" pressure balanced expansion joint?
Added on Fri, Oct 19, 2012
The spring rate is equal to the spring rate of both flow bellows plus the spring rate of the balancing bellows. Elbow Pressure Balanced Pipe Expansion Joint Read More
For an inline pressure balanced expansion joint, overall speaking, is it equivalent to a simple expansion joint without thrust force?
Added on Fri, Oct 19, 2012
No, it is the total of the spring rates of all three bellows. 36" Pressure Balanced Elbow Pipe Expansion Joint Read More
Can we use the externally pressurized expansion joint in a floating roof fuel tank rain drain system?
Added on Sat, Dec 10, 2011
You can use externally pressurized expansion joints in this application provided that the piping is anchored, supported, and guided correctly. Externally Pressurized Expansion Joints Read More
What is the max axial deflection you can get on 8" externally pressurized expansion joint?
Added on Sat, Dec 10, 2011
We can allow for a total of 16" of axial compression with a double x-flex expansion joint with an intermediate anchor base that will allow 8 inches of axial compression on either side of the anchor base. Externally Pressurized (X-Flex) Expansion... Read More
Do externally pressurized bellows need anchors for thrust load?
Added on Fri, Oct 19, 2012
Yes, an externally pressurized expansion joint requires that the piping system be anchored. Externally Pressurized Expansion Joints Read More

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