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Categories - Frequently Asked Questions (FAQ)

Category Articles
How much expansion can a flanged and fluid expansion joint accommodate?
Added on Thu, Feb 10, 2011
Flanged and flued expansion joints can take minimal amounts of axial motion due to the thickness of the flanged and flued heads. 72" Double Gimbal and Single Hinged Flanged and Flued Head Expansion Joints Read More
What is expansion joint ply?
Added on Wed, Jun 29, 2011
Ply refers to the number of sheet metal thicknesses used in the forming of the bellows. Therefore, a 2-ply bellows would be composed of two sheets of metal. 48" Tied Universal Expansion Joint with Two-ply Bellows Read More
What is a metallic expansion joint?
Added on Thu, Feb 10, 2011
A metallic expansion joint device used to absorb thermal movement that is generally fabricated from stainless steel or other high nickel alloys. Single Flanged Metallic Expansion Joint Read More
Where should we use carbon steel expansion joints?
Added on Wed, Jul 6, 2011
We typically only use carbon steel material for rectangular expansion joints which are installed in duct systems. Metallic Expansion Joint with Carbon Steel Flanges Read More
What is a flange on an expansion joint?
Added on Wed, Jun 29, 2011
The flange on an expansion joint can be one of the end connections to allow for connection to the pipe in the piping system. Flange Indicated on a Neoprene Expansion Joint Read More
How does a pressure balanced expansion joint work?
Added on Wed, Feb 9, 2011
A pressure balanced expansion joint is really a combination of several types. Its purpose is to retain and balance the pressure thrust so that main anchoring of the pipe or adjacent equipment is not required, and forces and movements on... Read More
What are gimbal expansion joints?
Added on Mon, Feb 7, 2011
The gimbal expansion joint is basically the same as the hinge type, except that instead of being limited to deflection in only one plane, it can accept bending or angulation in any plane. It contains two sets of hinge pins or pivots, the axis of each... Read More
What is the effective diameter of the bellows?
Added on Wed, Jun 29, 2011
The effective diameter of the bellows is the mean diameter of the convolutions. 42" Diameter Neoprene Fabric Expansion Joint for a Generator Cooling Fan in a Power Plant Read More
How thick is an expansion joint?
Added on Sat, Apr 16, 2011
Expansion joint thickness can vary from .010 inches to .125 inches thick depending upon the design requirements for your application. Universal Expansion Joint with 5" Thick Refractory Lining Read More
What is a heat exchanger bellows?
Added on Tue, Feb 8, 2011
Heat Exchanger shell bellows are used on fixed tube sheet heat exchangers. Bellows deflection is only axial and can be either extension or compression depending on the differential expansion of shell and tubes. In most cases the tubes are hotter than... Read More
How does a toroidal expansion joint work?
Added on Mon, Feb 7, 2011
A toroidal convolution consists of a circular tube (or totus) wrapped around weld ends or pipe ends having a gap at the I.D. to permit axial stroke. A toroidal expansion joint may consist of one convolution, or multiple convolutions. This joint is... Read More
Where can I find a metal expansion joint slide show?
Added on Sat, Apr 16, 2011
You can find a slide show on an introduction to U.S. Bellows that covers a wide variety of metallic expansion joints at the following link:   Introduction to U.S. Bellows Slide Show Read More
What are unreinforced bellows?
Added on Wed, Jun 29, 2011
Unreinforced bellows do not have any external type of reinforcement such as root rings or equalizing rings. Unreinforced Single Metallic Expansion Joint Read More
What is a swing expansion joint?
Added on Wed, Jul 6, 2011
A swing expansion joint is another term used for a hinge type expansion joint. Double Hinged Expansion Joint Read More
What will happen if bellow thickness is increased in expansion joints?
Added on Sat, Apr 16, 2011
If bellow thickness is increased, then the bellows spring rate will increase substantially. 72" Thick-wall Expansion Joint Read More
When should you replace metal bellows expansion joints?
Added on Thu, Feb 10, 2011
Metallic expansion joints should be replaced if they are leaking or can simply be replaced on a scheduled maintenance program in order to avoid leaks that may occur in the future. 36" Rectangular Metal Expansion Joint Read More
How common is it to use steel expansion joint in and out of centrifugal pump?
Added on Tue, Oct 16, 2012
We get inquiries for steel and rubber expansion joints for pump suction and discharge. Rubber Expansion Joints Read More
Why do expansion joints have one loose flange?
Added on Wed, Jun 29, 2011
Expansion joints have one loose flange when specified to facilitate the alignment of flanges on the piping system during installation. Single Tied Expansion Joints with Carbon Steel Flanges Read More
Why is the annealing of stainless steel bellows required?
Added on Wed, Jul 6, 2011
We do not recommend the annealing of stainless steel bellows because the bellows strength increases while decreasing the cycle life. Read More
Do hinged expansion joints have to be designed for pressure thrust?
Added on Sat, Dec 10, 2011
Yes, hinged expansion joints do need to be designed to accommodate for pressure thrust. Hinged Expansion Joint Read More
 
 
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