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Categories - Frequently Asked Questions (FAQ)

Category Articles
How do you decide on the number of tie-rods in a universal expansion joint?
Added on Thu, Feb 10, 2011
The number of tie-rods on a universal expansion joint is calculated according to the amount of pressure thrust that the particular expansion joint will absorb. Low pressure expansion joints may have two rods, for example, while high pressure... Read More
Can you use a tied expansion joint in the exhaust of a gas turbine application?
Added on Sat, Dec 10, 2011
Yes, a tied expansion joint is a correct application for tied expansion joints to eliminate pressure thrust on the turbine exhaust nozzle. 12" Single Expansion Joints with Tie Rods Read More
How long should a universal expansion joint be?
Added on Sat, Apr 16, 2011
The length of a universal expansion joint is dependent upon the amount of lateral motion to be absorbed by the expansion joint. This is determined on a case by case basis. Universal Expansion Joint and Duct Work Read More
Where should I use a universal expansion joint in piping?
Added on Wed, Jun 29, 2011
Universal expansion joints are typically used in z-bend or l-shape pipe arrangements where the expansion joint allows for lateral motion Universal Expansion Joints Read More
How do you achieve lateral movement in a tied universal expansion joint?
Added on Thu, Feb 10, 2011
The lateral movement in a tied universal expansion joint is achieved by having the bellows work together in angular rotation in order to obtain the correct lateral deflection. 27" Tied Universal Thick-wall Expansion Joint Read More
Why are loads on tied universal bellows not transferred?
Added on Thu, Feb 10, 2011
Loads on a tied universal bellows are not transferred because pressure thrust is contained within the tie rods and is not transferred to the piping system equipment. 6” Diameter Tied Universal Expansion Joints Read More
On a lateral tied expansion joint, is there space allowed in between the nut and the retainer to functionally avoid tilt of the tie-rod when at the operating temperature?
Added on Mon, Jun 18, 2012
We do not put slots on our expansion joints, but we leave a minimum gap between the nuts and the lug depending on the lateral movement. Tied Universal Expansion Joints Designed for a Power Generation Plant in Texas Read More
How do you design universal bellows with two different sizes?
Added on Wed, Jun 29, 2011
The preferred method to design universal expansion joints would be to use a larger diameter bellows and use a reducer at the end of the expansion joint. This would ensure angular rotation and axial movement between the two bellows. 72" Inch... Read More
Do hinged and gimbal expansion joints serve the same purpose?
Added on Mon, Jun 18, 2012
Hinged expansion joints take angular rotation in only one place. Gimbal expansion joints take angular rotation in two planes. Hinged Expansion Joint Double Gimbal Universal Expansion Joint Read More
While tie-rods may stabilize the expansion joint from sideways displacements does it not restrict the joint from thermal growth and thus reduce the functionality of the expansion joint?
Added on Sat, Dec 10, 2011
The expansion joint is designed to accommodate all the needed displacements. The tie-rods are part of the expansion joint and designed to absorb all the specified displacements. 20" Diameter Tied Universal Expansion Joint Read More
When is a universal expansion joint preferred over a single expansion joint?
Added on Sat, Dec 10, 2011
Universal expansion joints are usually used when there is large lateral motion. Universal Expansion Joint Read More
 
 
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